3RK1901-3MA00 - SIEMENS - Product.Network

Manual

04/2013Edition

Industrial Controls

AS-Interface

AS-i Master CM 1243-2 and AS-i Data Decoupling Unit DCM 1271

for SIMATIC S7-1200

Answers for industry.

AS-i master CM 1243-2 and AS-i data 
decoupling unit DCM 1271 for SIMATIC 
S7- 1200  
 
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Industrial Controls 
AS-Interface
AS-i master CM 1243-2 and AS-i 
data decoupling unit DCM 1271 for 
SIMATIC S7-1200 
Manual 
 
  
04/2013 
A5E02655230010A/RS-AA/003 
Preface 
 
 
Technical description 
 1
 
Displays and connections of 
the AS-i master CM 1243-2 
 2
 
Displays and connections of 
the AS-i data decoupling unit 
DCM 1271 
 3
 
Installation, connection and 
commissioning of the 
modules 
 4
 
Configuring with STEP 7 
 5
 
Data exchange between the 
user program and AS-i 
slaves 
 6
 
Using the data record 
interface 
 7
 
Diagnostics 
 8
 
Troubleshooting / fault 
displays 
 9
 
Technical data 
 10
 
AS-Interface Protocol 
Implementation 
Conformance Statements 
 A
 
Dimension drawings 
 B
 
Approvals 
 C
 
List of references 
 D
 
Notes on CE marking 
 E

Siemens AG

Industry Sector

Postfach 48 48

90026 NÜRNBERG

GERMANY

Order number: 3ZX1012-0RK71-1AC1

Ⓟ 04/2013 Technical data subject to change

Legal information

Warning notice system

This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent

damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert

symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are

graded according to the degree of danger.

DANGER

indicates that death or severe personal injury will result if proper precautions are not taken.

WARNING

indicates that death or severe personal injury may result if proper precautions are not taken.

CAUTION

indicates that minor personal injury can result if proper precautions are not taken.

NOTICE

indicates that property damage can result if proper precautions are not taken.

If more than one degree of danger is present, the warning notice representing the highest degree of danger will

be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to

property damage.

Qualified Personnel

The product/system described in this documentation may be operated only by personnel qualified for the specific

task in accordance with the relevant documentation, in particular its warning notices and safety instructions.

Qualified personnel are those who, based on their training and experience, are capable of identifying risks and

avoiding potential hazards when working with these products/systems.

Proper use of Siemens products

Note the following:

WARNING

Siemens products may only be used for the applications described in the catalog and in the relevant technical

documentation. If products and components from other manufacturers are used, these must be recommended

or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and

maintenance are required to ensure that the products operate safely and without any problems. The permissible

ambient conditions must be complied with. The information in the relevant documentation must be observed.

Trademarks

All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication

may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.

Disclaimer of Liability

We have reviewed the contents of this publication to ensure consistency with the hardware and software

described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the

information in this publication is reviewed regularly and any necessary corrections are included in subsequent

editions.

 
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
Manual, 04/2013, A5E02655230010A/RS-AA/003  5 
Preface 
Purpose of this manual 
This manual supports you in using the following AS-i modules: 
● AS-i master CM 1243-2 
● AS-i data decoupling unit DCM 1271 
We recommend the following procedure if ... 
● ... you want to gain an overview of the complete topic of AS-Interface: 
First read the manual "System Manual AS-Interface (Edition 11/2008) with Supplements 
(Edition 09/2010)" (order number: 3RK2703-3BB02-1AA1) 
There you will find general information about AS-Interface, referred to below as AS-i.  
The manual is available on the Internet 
(http://support.automation.siemens.com/WW/view/de/26250840/0/en). 
● ... you are configuring an AS-i system and commissioning it and are using the 
AS-i master CM 1243-2 and the AS-i data decoupling unit DCM 1271:  
You will find the necessary information regarding connection and operation of the 
AS-i master CM 1243-2 in the following sections: 
– "Technical description (Page 11)" 
– "Displays and connections of the AS-i data decoupling unit DCM 1271 (Page 23)" 
– "Installation, connection and commissioning of the modules (Page 29)" 
– "Configuring with STEP 7 (Page 37)" 
● ... you want to know how the AS-i master CM 1243-2 must be operated from the 
viewpoint of the automation system: 
– Read section "Data exchange between the user program and AS-i slaves (Page 47)" 
in this manual 
● ... you want to know how to diagnose and rectify faults in the system: 
– Read section "Diagnostics (Page 99)" in this manual 
– Read section "Troubleshooting / fault displays (Page 105)" in this manual 

Preface

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

6 Manual, 04/2013, A5E02655230010A/RS-AA/003

Preconditions

For an understanding of the complete document, the following is necessary:

● Basic knowledge of SIMATIC S7, STEP 7

● Knowledge of the manual "System Manual AS-Interface (Edition 11/2008) with

Supplements (Edition 09/2010)" (order number: 3RK2703-3BB02-1AA1)

The manual is available on the Internet

(http://support.automation.siemens.com/WW/view/de/26250840/0/en).

FAQs

You will find FAQs on Siemens AS-i products on the Internet on the Service and Support

pages of Industry Automation

(http://support.automation.siemens.com/WW/view/en/10805888/133000)

See also

Using the data record interface (Page 55)

 
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
Manual, 04/2013, A5E02655230010A/RS-AA/003  7 
Table of contents 
 
  Preface ...................................................................................................................................................... 5 
Technical description ............................................................................................................................... 11 
1  General information about operation, safety instructions ............................................................ 11 
2  Overview of the modules ............................................................................................................. 12 
2.1  AS-i master CM 1243-2 ............................................................................................................... 12 
2.1.1  Use of the AS-i master CM 1243-2 .............................................................................................. 12 
2.1.2  Scope of delivery of AS-i master CM 1243-2 ............................................................................... 12 
2.2  AS-i data decoupling unit DCM 1271 ........................................................................................... 13 
2.2.1  Use of the AS-i data decoupling unit DCM 1271 ......................................................................... 13 
2.2.2  Scope of supply of the AS-i data decoupling unit DCM 1271 ...................................................... 14 
2.3  System requirements ................................................................................................................... 14 
3  Permissible slots for modules ...................................................................................................... 14 
Displays and connections of the AS-i master CM 1243-2 ........................................................................ 17 
1  LEDs of the AS-i master CM 1243-2 ........................................................................................... 18 
1.1  Meaning of the LEDs of the AS-i master CM 1243-2................................................................... 18 
2  Electrical connections of the AS-i master CM 1243-2 ................................................................. 20 
Displays and connections of the AS-i data decoupling unit DCM 1271 .................................................... 23 
1  LEDs of the AS-i data decoupling unit DCM 1271 ....................................................................... 24 
Installation, connection and commissioning of the modules ..................................................................... 29 
1  Safety instructions ........................................................................................................................ 29 
2  Preparation ................................................................................................................................... 32 
3  Installation, connection and commissioning of the AS-i master CM 1243-2 ............................... 34 
4  Installation, connection and commissioning of the AS-i data decoupling unit DCM 1271 ........... 35 
5  Detecting ground faults with DCM 1271 ...................................................................................... 35 
Configuring with STEP 7 .......................................................................................................................... 37 
1  General notes on configuring the AS-i master CM 1243-2 with STEP 7 ..................................... 37 
2  STEP 7 basic configuration .......................................................................................................... 38 
3  Configuring AS-i slaves ................................................................................................................ 40 
4  Online functions ........................................................................................................................... 43 
4.1  Operating modes of the AS-i master CM 1243-2 ......................................................................... 43 
4.2  Switching operating mode ............................................................................................................ 44 
4.3  Loading the slave configuration ................................................................................................... 45 
4.4  Addressing an AS-i slave ............................................................................................................. 46 

Table of contents   
  
  AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
Manual, 04/2013, A5E02655230010A/RS-AA/003 
Data exchange between the user program and AS-i slaves .................................................................... 47 
1  Transferring AS-i digital values ................................................................................................... 47 
1.1  Addressing the AS-i slaves ......................................................................................................... 47 
1.2  Special characteristics of Combined Transaction Type Slaves .................................................. 49 
1.3  Special characteristics of AS-i Safety slaves .............................................................................. 50 
2  Cyclic transfer of the slave data in the process image ............................................................... 50 
3  Transferring AS-i analog values .................................................................................................. 51 
3.1  Accessing AS-i analog data via acyclic services ........................................................................ 52 
3.2  Special cases in analog value transfer ....................................................................................... 53 
Using the data record interface ................................................................................................................ 55 
1  Data record interface of the AS-i master CM 1243-2 .................................................................. 55 
2  Description of the AS-i line calls and AS-i slave calls ................................................................. 58 
2.1  Description of the AS-i line calls and AS-i slave calls ................................................................. 58 
2.2  AS-i line calls ............................................................................................................................... 61 
2.2.1  Configuring actual parameter values (Store_Actual_Parameters) .............................................. 61 
2.2.2  Configuring actual configuration data (Store_Actual_Configuration) .......................................... 62 
2.2.3  Configure LPS (Set_LPS) ........................................................................................................... 63 
2.2.4  Read lists and flags (Get_LPS_LAS_LDS_LPF_Flags) .............................................................. 64 
2.2.5  Read complete configuration (Get_LAS_CDI_PI_Flags) ............................................................ 67 
2.2.6  Configure complete configuration (Set_LPS_PCD_PP_Flags) ................................................... 70 
2.2.7  Set operating mode (Set_Operation_Mode) ............................................................................... 73 
2.2.8  Set offline mode (Set_Offline_Mode) .......................................................................................... 74 
2.2.9  Change AS-i slave address (Change_Slave_Address) .............................................................. 75 
2.2.10  Automatic address programming (Set_Auto_Addr_Enable) ....................................................... 76 
2.2.11  Write AS-i slave extended ID1 (Write_Extended_ID−Code_1) ................................................... 77 
2.2.12  Read AS-i line analog input data (Read_AIDI) ........................................................................... 78 
2.2.13  Write AS-i line analog output data (Write_AODI) ........................................................................ 80 
2.3  AS-i slave calls ............................................................................................................................ 81 
2.3.1  Configure parameter value (Set_Permanent_Parameter) .......................................................... 81 
2.3.2  Read configured parameter value (Get_Permanent_Parameter) ............................................... 82 
2.3.3  Write parameter value (Write_Parameter) .................................................................................. 83 
2.3.4  Read parameter value (Read_Parameter) .................................................................................. 84 
2.3.5  Configure configuration data (Set_Permanent_Configuration) ................................................... 84 
2.3.6  Read configuration data (Get_Permanent_Configuration) .......................................................... 85 
2.3.7  Read actual configuration data (Read_Actual_Configuration) .................................................... 86 
2.3.8  Read AS-i slave parameter string (Read_Parameter_String) ..................................................... 87 
2.3.9  Write AS-i slave parameter string (Write_Parameter_String) ..................................................... 88 
2.3.10  Read AS-i slave diagnostics string (Read_Diagnostic_String) ................................................... 89 
2.3.11  Read AS-i slave ID string (Read_Identification_String) .............................................................. 90 
2.3.12  Write CTT2 request (Write_CTT2_String) ................................................................................... 91 
2.3.13  Read CTT2 request (Read_CTT2_String) .................................................................................. 92 
2.3.14  Read AS-i slave I/O (Read_I/O_Configuration)........................................................................... 93 
2.3.15  Read AS-i slave ID (Read_ID−Code).......................................................................................... 93 
2.3.16  Read AS-i slave extended ID1 (Read_Extended_ID−Code_1) ................................................... 94 
2.3.17  Read AS−i slave extended ID2 (Read_Extended_ID−Code_2) .................................................. 94 
2.3.18  Read AS-i slave status (Read_Status) ........................................................................................ 95 
2.3.19  Read parameter echo (Get_Write_Parameter_Echo) ................................................................. 96 
2.3.20  Write AS-i slave analog output data (Write_Analog_Output_Data)............................................. 97 
2.3.21  Read AS-i slave analog input data (Read_Analog_Input_Data) ................................................. 98 

 Table of contents 
  
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
Manual, 04/2013, A5E02655230010A/RS-AA/003  9 
8  Diagnostics .............................................................................................................................................. 99 
8.1  Overview ...................................................................................................................................... 99 
8.2  Diagnostics in STEP 7 ................................................................................................................. 99 
8.3  Alarms ........................................................................................................................................ 101 
8.3.1  Possible response to the diagnostic interrupt ............................................................................ 103 
8.3.2  Interrupt response in different CM operating states................................................................... 103 
8.4  Diagnostic data records ............................................................................................................. 104 
8.5  Diagnostics via the S7-1200 Web server ................................................................................... 104 
9  Troubleshooting / fault displays ............................................................................................................. 105 
9.1  Replacing a defective AS-i slave / automatic address programming ........................................ 105 
9.2  Fault indications/fault remedies ................................................................................................. 106 
10  Technical data ....................................................................................................................................... 109 
10.1  AS-i cycle time ........................................................................................................................... 111 
A  AS-Interface Protocol Implementation Conformance Statements .......................................................... 115 
A.1  AS-Interface Protocol Implementation Conformance Statement (PICS) ................................... 115 
B  Dimension drawings .............................................................................................................................. 119 
B.1  Dimension drawing AS-i master CM 1243-2 .............................................................................. 119 
B.2  Dimension drawing for AS-i data decoupling unit DCM 1271 .................................................... 119 
C  Approvals ............................................................................................................................................... 121 
D  List of references ................................................................................................................................... 127 
E  Notes on CE marking ............................................................................................................................. 129 
  Glossary ................................................................................................................................................ 131 
  Index ...................................................................................................................................................... 135 

Table of contents

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

10 Manual, 04/2013, A5E02655230010A/RS-AA/003

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003

Technical description 1

1.1 General information about operation, safety instructions

Use of AS-i master CM 1243-2

The AS-i master CM 1243-2 is integrated in the S7-1200 automation system as a

communication module.

Safety instructions

WARNING

Risk of explosion when connecting or disconnecting the device

Can cause death, serious injury, or property damage

Explosion hazard

Do not disconnect equipment when a flammable or combustible atmosphere is present.

NOTICE

Protection from transient overvoltage

Implement measures to prevent transient overvoltages of more than 40% of the rated

voltage. This is ensured if you operate the devices exclusively with SELV (Safety Extra Low

Voltage).

See also

Use of the AS-i master CM 1243-2 (Page 12)

Use of the AS-i data decoupling unit DCM 1271 (Page 13)

S7-1200 System Manual

(http://support.automation.siemens.com/WW/view/de/36932465/0/en)

Technical description

1.2 Overview of the modules

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

12 Manual, 04/2013, A5E02655230010A/RS-AA/003

1.2 Overview of the modules

1.2.1 AS-i master CM 1243-2

1.2.1.1 Use of the AS-i master CM 1243-2

The AS-i master CM 1243-2 permits the connection of an AS-i line to the automation system

("AS" or "PLC") of the SIMATIC S7-1200 series.

With the help of the AS-i master CM 1243-2, you can access the inputs and outputs of the

AS-i slaves from the automation system. You can access binary or analog values depending

on the slave type.

All AS-i slaves according to AS-i specification V3.0 can be operated, with the exception of

slaves according to to slave profiles 7.1 and 7.2.

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Figure 1-1 Use of the master module AS-i master CM 1243-2 in the S7-1200

1.2.1.2 Scope of delivery of AS-i master CM 1243-2

The following components are included in the scope of supply:

1. AS-i master CM 1243-2 (order number 3RK7243-2AA30-0XB0)

2. Removable screw-type terminal block (pre-assembled)

Note

Removable screw-type terminal block

The removable screw-type terminal block can be reordered as an accessory.

(Order number: 3RK1901-3MA00)

3. Operating Instructions

Technical description

1.2 Overview of the modules

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 13

1.2.2 AS-i data decoupling unit DCM 1271

1.2.2.1 Use of the AS-i data decoupling unit DCM 1271

The AS-i data decoupling unit DCM 1271 is required as an accessory to the AS-i master

CM 1243-2 if:

● an AS-i power supply unit is not integrated into the bus

● and power is supplied from a standard power supply unit.

In order to supply the AS-Interface from a standard power supply unit, a data decoupling unit

must be connected between the voltage supply and AS-i network (AS-i Power 24 V).

Note

Several CM 1243-2 AS-i masters in one automation system

If several CM 1243-2 AS-i masters are operated in one automation system, each

AS-i master will need its own AS-i data decoupling unit DCM 1271.

Integrated ground fault detection

With the help of the AS-i data decoupling unit DCM 1271, ground faults can be detected on

the AS-i cable. The information can be transferred to the S7-1200 CPU via terminals.

Overload protection

The AS-i data decoupling unit has integrated overload protection.

When there is a short circuit or overload on an AS-i cable, the relevant AS-i line is switched

off (electronic transistor output) and is thereby decoupled from the power source (selectivity).

The restart occurs automatically after about 5 seconds.

Technical description

1.3 Permissible slots for modules

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

14 Manual, 04/2013, A5E02655230010A/RS-AA/003

1.2.2.2 Scope of supply of the AS-i data decoupling unit DCM 1271

The following components are included in the scope of supply:

1. AS-i data decoupling unit DCM 1271 (Order No.: 3RK7271-1AA30-0AA0)

2. Removable screw-type terminal blocks (pre-assembled)

– 5-pole terminal under the bottom cover

– 3-pole terminal on the top

Note

Removable screw-type terminal blocks

The removable screw-type terminal blocks can be reordered as accessories.

Order numbers:

• 5-pole terminal: 3RK1901-3MA00

• 3-pole terminal: 3RK1901-3MB00

3. Operating Instructions

1.2.3 System requirements

System requirements

● The firmware version of the CPU must be at least V2.2.

Max. 1 AS-i master CM 1243-2 can be connected.

● A possible expansion to the number of AS-i masters that can be connected will be

announced via the Service & Support Portal on the Siemens Internet site.

● STEP 7 Basic or Professional V11 with Service Pack 2

● Hardware Support Package (HSP) for STEP 7 V11 SP2

1.3 Permissible slots for modules

AS-i master CM 1243-2

The AS-i master CM 1243-2 can be inserted into any communication module slot in the

automation systems S7-1200 CPU. Any combination with other S7-1200 communication

modules (e.g. RS232, RS485, GPRS) is permitted within the S7-1200 system.

Technical description

1.3 Permissible slots for modules

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 15

AS-i data decoupling unit DCM 1271

The AS-i data decoupling unit DCM 1271 has no connection to the S7 communication bus.

The AS-i data decoupling unit DCM 1271 must therefore always be plugged into the left of

the last of up to three communication modules. When different communication modules are

used, it is recommended that the AS-i master CM 1243-2 is inserted to the left of the other

communication modules and the AS-i data decoupling unit DCM 1271 is inserted directly

onto the AS-i master CM 1243-2.

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DCM 1271

Note

Maximum configuration

With CPU firmware version V2.2 a maximum of one AS-i master CM 1243-2 can be

connected.

A possible expansion to the number of AS-i masters that can be connected will be

announced via the Service & Support Portal on the Siemens Internet site.

Figure 1-3 Device arrangement: S7-1200, other communication modules, AS-i master CM 1243-2

and

AS-i data decoupling unit DCM 1271

Technical description

1.3 Permissible slots for modules

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

16 Manual, 04/2013, A5E02655230010A/RS-AA/003

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 17

Displays and connections of the AS-i master

CM 1243-2 2

Position of the display elements and the electrical connections

The LEDs for detailed display of the module states are located under the top enclosure cover

of the AS-i master CM 1243-2.

The terminals for AS-Interface and the functional grounding are located under the cover at

the bottom of the AS-i master CM 1243-2.

Opening the enclosure covers

Open the upper or lower enclosure cover by rotating it downwards or upwards as shown in

the figure. The enclosure covers have been extended for this purpose to form a handle.

You will find further details in the "SIMATIC S7 S7-1200 Programmable Controller" System

Manual (order number: 6ES7298-8FA30-8BH0). The S7-1200 System Manual

(http://support.automation.siemens.com/WW/view/de/36932465/0/en) is available on the

Internet.

Figure 2-1 Enclosure covers

Displays and connections of the AS-i master CM 1243-2

2.1 LEDs of the AS-i master CM 1243-2

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

18 Manual, 04/2013, A5E02655230010A/RS-AA/003

2.1 LEDs of the AS-i master CM 1243-2

2.1.1 Meaning of the LEDs of the AS-i master CM 1243-2

Arrangement of the LEDs of the AS-i master CM 1243-2

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AS-i AS-i interface

PF Peripheral fault

CM Configuration mode

CER Error in configuration

DIAG Diagnosis

Figure 2-2 LEDs

LED LED colors Meaning

Display of the system status and system errors (Diagnosis)

LED off There is no supply over the communications bus.

Green, flashing The AS-i master CM 1243-2 is in start-up mode or is not configured via STEP 7.

Green, lit The AS-i master CM 1243-2 has started up without errors.

DIAG

Red, flashing A fault is present:

• AS-i supply voltage missing

• Internal error

• Error in configuration

• Parameterization error

• Peripheral fault

Details of AS-Interface status

LED off The AS-i master CM 1243-2 is offline.

Red, lit A fault has occurred and the AS-i bus has failed, e.g. the supply voltage for AS-Interface is

too low.

Red, flashing A fault has occurred, without failure of the AS-i bus, e.g. when an AS-i slave reports a

parameterization error.

AS-i

Green, lit No fault on the AS-i bus.

Displays and connections of the AS-i master CM 1243-2

2.1 LEDs of the AS-i master CM 1243-2

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 19

LED LED colors Meaning

Indication of peripheral faults

Red, lit A peripheral fault has occurred, e.g. overload on standard outputs and /or overload of sensor

power supply of the standard inputs.

Indication of operating mode (Configuration Mode)

Green, lit The AS-i master CM 1243-2 is in configuration mode.

LED off The AS-i master CM 1243-2 is in protected mode.

Indication of errors in the configuration (Configuration Error)

Indicates whether the slave configuration detected on the AS-i cable matches the PLANNED configuration (LPS)

configured in the AS-i master CM 1243-2.

CER

Yellow, lit • A configured AS-i slave is not detected on the AS-i cable (e.g. the slave has failed).

• An AS-i slave that has not yet been configured is detected on the AS-i cable.

• A connected slave has different configuration data (I/O configuration, ID code) than the

slave configured in the AS-i master CM 1243-2.

Displays and connections of the AS-i master CM 1243-2

2.2 Electrical connections of the AS-i master CM 1243-2

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

20 Manual, 04/2013, A5E02655230010A/RS-AA/003

2.2 Electrical connections of the AS-i master CM 1243-2

Power supply of the AS-i master CM 1243-2

The AS-i master CM 1243-2 is supplied over the communications bus of the S7-1200. This

means that a diagnostics message can still be sent to the S7-1200 following failure of the

AS-i supply voltage. The connection to the communications bus is on the right-hand side of

the AS-i master CM 1243-2.

AS-Interface terminals

The removable terminal for connecting the AS-i cable is located behind the lower cover on

the front of the AS-i master CM 1243-2.

If the AS-i shaped cable is used, you can recognize the correct polarity of the cable by

means of the symbol .

Information on how to remove and re-install the terminal block can be found in the system

manual "SIMATIC S7-1200 Programmable Controller" (Order No.: 6ES7298-8FA30-8AH0).

Note

Maximum current carrying capacity of the terminal contacts

The current carrying capacity of the connection contacts is max. 8 A. If this value is

exceeded on the AS-i cable, the AS-i master CM 1243-2 must not be "looped in" to the AS-

i cable, but must instead be connected via a spur line (only one connection pair assigned on

the AS-i master CM 1243-2).

Please also ensure that the cables used are suitable for operating temperatures of at least

75°C if current is being conducted via the AS-i master and currents of greater than 4

amperes are present.

You will find additional information on connecting the AS-i cable in the section "Installation,

connection and commissioning of the modules" in the manual "AS-i Master CM 1243-2 and

AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200".

Displays and connections of the AS-i master CM 1243-2

2.2 Electrical connections of the AS-i master CM 1243-2

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 21

Terminal assignment

Label Meaning

ASI+ AS-i connection – positive polarity

ASI– AS-i connection – negative polarity

Functional ground

See also

S7-1200 Manual (http://support.automation.siemens.com/WW/view/de/36932465/0/en)

Displays and connections of the AS-i master CM 1243-2

2.2 Electrical connections of the AS-i master CM 1243-2

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

22 Manual, 04/2013, A5E02655230010A/RS-AA/003

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 23

Displays and connections of the AS-i data

decoupling unit DCM 1271 3

Position of the display elements and the electrical connections

The LEDs for detailed display of the module states are located behind the top enclosure

cover of the AS-i data decoupling unit DCM 1271.

The terminals for AS-Interface and the connection for ground fault detection are located

under the cover at the bottom of the AS-i data decoupling unit DCM 1271.

The infeed from the power supply unit and the connection for functional grounding are

located on the top of the AS-i data decoupling unit DCM 1271.

Opening the enclosure covers

Open the upper or lower enclosure cover by rotating it downwards or upwards as shown in

the figure. The enclosure covers have been extended for this purpose to form a handle.

You will find further details in the "SIMATIC S7 S7-1200 Programmable Controller" System

Manual (order number: 6ES7298-8FA30-8BH0). The S7-1200 System Manual

(http://support.automation.siemens.com/WW/view/de/36932465/0/en) is available on the

Internet.

Figure 3-1 Enclosure covers

Displays and connections of the AS-i data decoupling unit DCM 1271

3.1 LEDs of the AS-i data decoupling unit DCM 1271

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

24 Manual, 04/2013, A5E02655230010A/RS-AA/003

3.1 LEDs of the AS-i data decoupling unit DCM 1271

Arrangement of the LEDs of the AS-i data decoupling unit DCM 1271

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EFD Earth Fault Detection

ASI OL AS-i Overload

DIAG Diagnose

Figure 3-2 LEDs

The AS-i data decoupling unit DCM 1271 has various LEDs for status indication:

● LED "DIAG" on the front plate of the AS-i data decoupling unit DCM 1271

● LEDs "EFD" and "ASI OL" underneath the upper enclosure cover of the AS-i data

decoupling unit DCM 1271

Indication of the operating and communicating status of the AS-i data decoupling unit DCM 1271

The LEDs indicate the operating status of the AS-i data decoupling unit DCM 1271 as shown

below:

Table 3- 1 Indication of the basic states of the AS-i data decoupling unit DCM 1271

DIAG

(Diagnosis)

EFD

(Earth Fault Detection)

ASI OL

(AS-i Overload)

Meaning

Off Off Off Voltage OFF

green Off Off Normal operation, without errors

Red, flashing Red — A ground fault has been detected on the AS-i cable.

Red, flashing

— Red An overload has been detected on the AS-i cable.

Displays and connections of the AS-i data decoupling unit DCM 1271

3.1 LEDs of the AS-i data decoupling unit DCM 1271

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 25

Electrical connections of the AS-i data decoupling unit DCM 1271

The AS-i data decoupling unit DCM 1271 has connections for the infeed from the power

supply unit on the top of the device and the outgoing feeder for supplying the AS-i cable

underneath the lower cover on the front of the device. The terminals for connection of the

ground fault detection are also located here.

Both terminals can be removed to make connection easier.

You will find instructions for removing and reinstalling the terminals in the "SIMATIC S7-1200

Programmable Controller" System Manual (order number: 6ES7298-8FA30-8BH0) on the

Internet (http://support.automation.siemens.com/WW/view/de/36932465/0/en).

Terminal assignment for connection of the power supply unit

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No. Label Meaning

①

Functional ground

② 1M Power supply unit ground

③ 1L+ Input, power supply unit 24 to 30 V, positive polarity

Figure 3-3 Terminal labeling for power supply unit

Displays and connections of the AS-i data decoupling unit DCM 1271

3.1 LEDs of the AS-i data decoupling unit DCM 1271

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

26 Manual, 04/2013, A5E02655230010A/RS-AA/003

Terminal assignment for connection of AS-Interface and ground fault detection

    

No. Label Meaning

① 2L+ Ground fault detection: Input, power supply unit 24 to 30 V, positive

polarity

② 2M Ground fault detection: Ground

③ DQ Output, ground fault detection

In the case of a ground fault, the voltage is switched through from 2L+

to DQ.

④ ASI+ Output, AS-i – positive polarity

⑤ ASI– Output, AS-i – negative polarity

Figure 3-4 Terminal labeling for AS-Interface and ground fault detection

Note

If the AS-i shaped cable is used, you can recognize the correct polarity of the cable by

means of the symbol .

Displays and connections of the AS-i data decoupling unit DCM 1271

3.1 LEDs of the AS-i data decoupling unit DCM 1271

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 27

Note

A connected power supply unit must comply with the PELV/SELV (Protective Extra Low

Voltage/Safety Extra Low Voltage) standard and have a residual ripple of < 250 mVpp.

The power supply unit used must limit the output voltage to a maximum of 40 V in the event

of a fault.

Additional information on the electrical connections

Read section Installation, connection and commissioning of the modules (Page 29) for

instructions on connecting the electrical connections.

You can find technical details on the electrical connections in section Technical data

(Page 109).

Displays and connections of the AS-i data decoupling unit DCM 1271

3.1 LEDs of the AS-i data decoupling unit DCM 1271

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

28 Manual, 04/2013, A5E02655230010A/RS-AA/003

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 29

Installation, connection and commissioning of the

modules 4

4.1 Safety instructions

Safety instructions for use of the device

The following safety instructions must be observed during installation and operation of the

individual devices and all the associated work, such as assembly, connection, device

replacement and opening the device.

General notes

WARNING

Safety Extra Low Voltage

Can cause death, serious injury, or property damage

The device is designed for operation with a directly connectable Safety Extra Low Voltage

(SELV) through a power supply with limited output (Limited Power Source, LPS); this does

not apply to 100 V ... 240 V devices.

It is therefore only permitted to connect Safety Extra Low Voltages (SELV) with Limited

Power Source (LPS) in accordance with IEC 60950-1 / EN 60950-1 / VDE 0805-1 to the

supply terminals, or the power supply unit used to supply the device must comply with

NEC Class 2 according to the National Electrical Code (r) (ANSI / NFPA 70).

Additionally for devices with redundant power supply:

If the device is connected to a redundant power supply (two separate power supplies), both

must fulfill the requirements listed above.

WARNING

Dangerous voltage

Can cause death, serious injury, or property damage

Always disconnect the device from the power supply before opening it.

Installation, connection and commissioning of the modules

4.1 Safety instructions

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

30 Manual, 04/2013, A5E02655230010A/RS-AA/003

General notes on use in hazardous areas

WARNING

Risk of explosion when connecting or disconnecting the device

Can cause death, serious injury, or property damage

Explosion hazard

Do not disconnect equipment when a flammable or combustible atmosphere is present.

Note

Requirements for the control cabinet

If the device is used in areas subject to explosion hazard according to Class I, Division 2 or

Class I, Zone 2, it must be installed in an appropriate control cabinet or enclosure.

Notes on use in hazardous areas according to ATEX

WARNING

Requirements for the control cabinet

For compliance with EU Directive 94 / 9 (ATEX 95), the enclosure must fulfill the

requirements of IP54 or higher according to EN 60529.

NOTICE

Protection from transient overvoltage

Implement measures to prevent transient overvoltages of more than 40% of the rated

voltage. This is ensured if you operate the devices exclusively with SELV (Safety Extra Low

Voltage).

Installation, connection and commissioning of the modules

4.1 Safety instructions

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 31

Before installation and commissioning

Note

Read the "SIMATIC S7-1200 Programmable Controller" System Manual

Before installation, connection and commissioning, read the corresponding sections in the

"SIMATIC S7-1200 Programmable Controller" System Manual.

Follow the instructions in the system manual for installation and connection.

Ensure that the power supply is switched off during installation /removal of the devices.

You can find the system manual on the Internet

(http://support.automation.siemens.com/WW/view/de/36932465/0/en) (order number:

6ES7298-8FA30-8AH0).

Installation, connection and commissioning of the modules

4.2 Preparation

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

32 Manual, 04/2013, A5E02655230010A/RS-AA/003

4.2 Preparation

Dimensions for installation

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S7-1200 devices Width A Width B1)

CPU 1211C, CPU 1212C 90 mm 45 mm

CPU ①

CPU 1214C 110 mm 55 mm

8 or 16 digital I/O

2, 4 or 8 analog I/O

Thermocouple, 4 or 8 I/O

RTD, 4 I/O

45 mm 22.5 mm

Signal modules ②

16 analog I/O

RTD, 8 I/O

70 mm 35 mm

CM 1241 RS232 and CM 1241 RS485 30 mm 15 mm

CM 1243-5 (PROFIBUS master)

CM 1242-5 (PROFIBUS slave)

30 mm 15 mm

CP 1242-7 (GPRS-CP) 30 mm 15 mm

Communication

interfaces ③

CM 1243-2 AS-i master 30 mm 15 mm

Special modules ③ DCM 1271 AS-i data decoupling unit 30 mm 15 mm

1) Width B: Distance between edge of enclosure and center of the drilled hole of the standard

mounting rail terminal

Standard mounting rail terminal

All CPUs, SMs, CPs and CMs can be mounted on the standard mounting rail or in the

control cabinet. Use the withdrawable rail terminals for fixing the device to the standard

mounting rail. These terminals also latch in place in the withdrawn position to allow the

device to be installed in a switchboard. The internal size of the drilled hole in the standard

mounting rail terminal on the device is 4.3 mm.

Installation, connection and commissioning of the modules

4.2 Preparation

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 33

Mounting position

Note

Mounting position

On mounting, the upper and lower ventilation slots of the module must not be covered and

good ventilation must be ensured. Above and below the module, a clearance of 25 mm must

be maintained for air circulation as protection against overheating. Note the permissible

temperature ranges in accordance with the mounting position.

Mounting position / permissible temperature range Mounting position

Horizontal mounting of the standard mounting rail:

0 °C ... 55 °C

Vertical mounting of the standard mounting rail:

0 °C ... 45 °C

See also

Configuring with STEP 7 (Page 37)

Installation, connection and commissioning of the modules

4.3 Installation, connection and commissioning of the AS-i master CM 1243-2

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

34 Manual, 04/2013, A5E02655230010A/RS-AA/003

4.3 Installation, connection and commissioning of the AS-i master

CM 1243-2

WARNING

Dangerous voltage

Can cause death, serious injury, or property damage.

Always switch off the power before wiring the S7-1200.

Step Execution Notes and explanations

1 Insert the AS-i master CM 1243-2 on the standard

rail.

Use a 35 mm standard mounting rail. The slots for

communication modules to the left of the CPU can be

used.

2 Connect the AS-Interface cable to the AS-i master

CM 1243-2.

The connections are underneath the lower cover of

the AS-i master CM 1243-2.

You can find more information about connecting in

section "Electrical connections of the AS-i master CM

1243-2 (Page 20)".

2a Connect the terminal (functional ground symbol) with

the functional ground of your system

Note the relevant instructions in the Section "Wiring

guidelines" in the system manual for SIMATIC S7-

1200

3 Switch on the power supply.

4 Close the front covers of the module and keep them

closed during operation.

5 The next step in commissioning is to download the

STEP 7 project data.

The STEP 7 project data of the AS-i master

CM 1243-2 is transferred when downloading the

station. To download the station, connect the

engineering station on which the project data is

located to the Ethernet interface of the CPU.

For further information about downloading, refer to

the following sections of the online help for STEP 7:

• "Downloading project data"

• "Using online and diagnostic functions"

Installation, connection and commissioning of the modules

4.4 Installation, connection and commissioning of the AS-i data decoupling unit DCM 1271

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 35

4.4 Installation, connection and commissioning of the AS-i data

decoupling unit DCM 1271

WARNING

Dangerous voltage

Can cause death, serious injury, or property damage.

Always switch off the power before wiring the S7-1200.

Step Execution Notes and explanations

1 Insert the AS-i data decoupling unit DCM 1271 on

the standard rail.

Use a 35 mm standard mounting rail. The slots to the

left of the communication modules (CM) can be

used.

2 Attach the power supply leads to the supplied plug

and insert the plug in the socket on the top of the

AS-i data decoupling unit DCM 1271.

The assignment is printed on the top of the enclosure

next to the socket.

3 Connect the terminals ASI+ and ASI- of the

AS-i master CM 1243-2 to the terminals of the same

name of the AS-i data decoupling unit DCM 1271.

The connections are underneath the lower cover of

the AS-i data decoupling unit DCM 1271.

You can find more information about connecting in

section "Displays and connections of the AS-i data

decoupling unit DCM 1271 (Page 23)".

Optional

Connect the terminals for ground fault detection on

the AS-i data decoupling unit DCM 1271.

For further information on ground fault detection, see

section "Detecting ground faults with DCM 1271

(Page 35)".

5 Switch on the power supply.

6 Close the front covers of the module and keep them

closed during operation.

The AS-i data decoupling unit DCM 1271 cannot be

configured in STEP 7.

4.5 Detecting ground faults with DCM 1271

With the help of the AS-i data decoupling unit DCM 1271, ground faults can be detected on

the AS-i bus and this information can be transferred to the S7-1200 for further processing.

A fault is detected when a connection to ground potential is detected on one of the

AS-i cables (ASI+ or ASI-). This is signaled via the output with the terminal designation "DQ".

For this purpose, this output must be connected to a spare digital input "DI" of the S7-1200.

The terminal "2M" must be connected to the ground connection for the inputs. The positive

potential of the incoming supply must be connected to "2L+".

Terminals "2M" and "2L+" are galvanically isolated from "1M" and "1L+", which enables you

to use different power supplies for the inputs and for the operation of the AS-i data

decoupling unit DCM 1271.

Installation, connection and commissioning of the modules

4.5 Detecting ground faults with DCM 1271

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

36 Manual, 04/2013, A5E02655230010A/RS-AA/003

Connection example

The example below shows the terminal assignment when using the digital input "DI.0" of a

SIMATIC S7-1211 CPU. The same power supply is used here for the inputs and for the data

decoupling unit.

'&0 &0 &38

9'&,138760

9'&/ 9'&0 9'&,13876',D

9'&/ 9'&0

/ 0 '4

Signal status

The output "DQ" is connected to "2L+" in the case of a ground fault. In this state, the signal

information "1" is available for further processing in the user program of the CPU.

Acknowledgement of the ground fault is not necessary, because the output is automatically

reset after the problem has been rectified, i.e. the connection between "2L+" and "DQ" is

disconnected.

Configuring with STEP 7

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 37

Configuring with STEP 7 5

5.1 General notes on configuring the AS-i master CM 1243-2

with STEP 7

Preconditions

To configure the AS-i master CM 1243-2, you will need STEP 7 Basic or Professional,

Version 11 or higher, Service Pack 2. If this AS-i master is not included in the hardware

catalog of the program, you will need a "Hardware Support Package", which you can obtain

from the Siemens Service & Support Internet site:

Siemens Service & Support

(http://support.automation.siemens.com/WW/view/en/47071380/133100)

Note

AS-i data decoupling unit DCM 1271

The AS-i data decoupling unit DCM 1271 does not have to be configured, because this

module does not exchange any data with the S7-1200.

Significance of configuration in STEP 7

Configuration in STEP 7 is essential for use of the AS-i master CM 1243-2 in an S7-1200. A

distinction is made here between the necessary basic configuration of the AS-i master and

the optional configuration of the AS-i slaves.

See also

Loading the slave configuration (Page 45)

Configuring with STEP 7

5.2 STEP 7 basic configuration

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

38 Manual, 04/2013, A5E02655230010A/RS-AA/003

5.2 STEP 7 basic configuration

Inserting the AS-i master CM 1243-2 in the S7-1200 station in STEP 7

The AS-i master CM 1243-2 is taken from the hardware catalog in STEP 7 HW Config in the

same manner as any other module, and inserted in the rack of the S7-1200 station in the

correct slot.

Configuring the properties of the AS-i master CM 1243-2

In the STEP 7 inspector window, you can view, configure and change general information,

addresses and operating parameters.

Switch to the properties dialog for the AS-i master CM 1243-2.

● "General" tab

You can change the name of the AS-i master CM 1243-2 here.

● "Operating parameters" tab

The parameters for the response of the AS-i master are displayed here

● "I/O addresses" tab

The address area can be set here for the I/O addresses in the basic configuration

● "AS-i interface (X1)" tab

You can change the assignment to an AS-i network here.

Note

"Diagnostic interrupt for faults in the AS-i configuration" and "Automatic address

programming" are always active and are therefore shown in gray.

Configuring with STEP 7

5.2 STEP 7 basic configuration

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 39

System assignment for logical addresses

During basic configuration, the parameter "System assignment" is automatically activated by

STEP 7. This ensures that the system will automatically assign AS-i slave addresses to

logical I/O addresses.

A 62 byte address range is reserved by the AS-i master CM 1243-2 and you can specify its

position in the process image with the "I/O addresses" settings.

When system assignment is activated, the assignment of AS-i address to logical I/O address

is shown in STEP 7:

If you do not configure any slaves, you must inform the AS-i master CM 1243-2 about the

actual bus configuration using the online function "ACTUAL > PLANNED" in STEP 7. See

section "Loading the slave configuration (Page 45)".

See also

Configuring AS-i slaves (Page 40)

Configuring with STEP 7

5.3 Configuring AS-i slaves

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

40 Manual, 04/2013, A5E02655230010A/RS-AA/003

5.3 Configuring AS-i slaves

Advantages of configuring the slaves:

If you configure the AS-i slaves (optional), you specify in STEP 7 those stations with which

the AS-i master should communicate. There is then no need to load the slave configuration

using the online function ACTUAL -> PLANNED.

● AS-i slaves are displayed in the network view complete with relevant AS-i addresses

● The slave parameters can be configured.

● The configuration of the I/O data of a slave is displayed.

● Access to analog AS-i slaves is possible via the process image of the PLC.

● Diagnostic information is displayed in the form of an icon on the AS-i slave in the network

view

● For smaller configurations, fewer I/O addresses are required in the S7-1200 than are

provided in the basic configuration.

Points to note when configuring the SIRIUS M200D Standard motor starter

The SIRIUS M200D Standard motor starter can also be parameterized via AS-Interface. In

combination with the AS-i master CM 1243-2, this can be performed in STEP 7 directly. It is

no longer necessary to execute the parameterization procedure via the PLC program.

The parameters are now set in the inspector window of the M200D motor starter in the

section "Module parameters". Please ensure here that the setting "Wait for data record

parameters" under "Options" is activated.

For parameter assignment in STEP 7, an M200D motor starter with one of the following

product versions is required:

Table 5- 1 Firmware requirements

Order number Product version

3RK1325-6.S41-.AA. E08

3RK1325-6.S71-.AA. E07

Note

Firmware requirements

If your connected M200D motor starter is based on an older product version, you should

deactivate parameter assignment in STEP 7. This is done in the inspector window of the

M200D.

Deactivation is also necessary when you decide to set the parameters using the "Motor

starter ES" software.

Configuring with STEP 7

5.3 Configuring AS-i slaves

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 41

Note

A configuration of the AS-i slaves specified through STEP 7 and downloaded into the S7

station is transferred by the CPU on the AS-i master CM 1243-2 during S7 station start-up.

Any existing configuration that was determined via the online function

"ACTUAL -> PLANNED" will be overwritten.

Procedure

To configure the AS-i slaves, open the hardware catalog in STEP 7. You will find the

AS-i slaves under "Field devices".

Three basic types are available:

● Universal AS-i slave (for standard and A/B slaves)

● Universal AS-i F-slave (for Safety At Work applications)

● Siemens AS-i slave

Note

Using AS-i slaves from Siemens

When you use AS-i slaves from Siemens, you can select the slave directly from the

hardware catalog.

To configure an AS-i slave from another manufacturer, you must use the universal

AS-i slave or the universal AS-i F-slave.

If an AS-i slave is assigned to the AS-i master in STEP 7, the system will automatically

deactivate the "System assignment" parameter of the AS-i master. The 62 byte long address

area is also canceled in this case, because when a slave is configured it is assigned to a

specific I/O address.

Configuring the properties of universal AS-i slaves

If you are configuring with the universal AS-i slave or universal AS-i F slave, you can set the

following parameters:

● Profile ID of the AS-i slave

● Parameters of the AS-i slave

● Logical I/O address of the AS-i slave

You will find the profile ID and meaning of the AS-i slave parameters in the documentation

for the AS-i slaves.

Configuring with STEP 7

5.3 Configuring AS-i slaves

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

42 Manual, 04/2013, A5E02655230010A/RS-AA/003

The I/O assignment of the slaves is displayed in the section "Configuration" in accordance

with the parameterized profile ID.

Configuring the properties of Siemens AS-i slaves

When you use an AS-i slave from Siemens, you can select the slave directly from the

hardware catalog.

The differences as compared to the universal AS-i slave are as follows:

● The device type is represented as a symbol

● The meaning of the slave parameters is displayed as text.

● The underlying slave profile is already set. The IO, ID and ID2 identifiers do not need to

be entered.

Setting the logical I/O addresses of AS-i slaves.

When slaves are configured, each one receives a specific, logical I/O address. This is

displayed in the inspector window in STEP 7 and can be changed as required.

 Configuring with STEP 7 
 5.4 Online functions 
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
Manual, 04/2013, A5E02655230010A/RS-AA/003  43 
5.4 Online functions 
5.4.1 Operating modes of the AS-i master CM 1243-2 
The AS-i master CM 1243-2 has two operating modes: 
● Configuration mode 
● Protected mode 
Configuration mode   
Configuration mode is used for commissioning an AS-i installation. 
You switch the AS-i master CM 1243-2 in STEP 7 from protected mode (productive 
operation) to configuration mode. (The LED "CM" is lit green) 
In configuration mode, the AS-i master CM 1243-2 can exchange data with any AS-i slave 
connected to the AS-i cable, except for AS-i slaves with address "0". Newly added 
AS-i slaves are immediately detected, activated and included in cyclic data exchange by the 
master.  
In configuration mode, alarms relating to AS-i slave configuration errors are not transferred 
to the S7-1200. 
In this mode, the DIAG LED is also not lit up in red. 
 
Protected mode   
Changeover from "Configuration mode" to "Protected mode" is performed in STEP 7. In 
"Protected mode" the AS-i master CM 1243-2 only exchanges data with the configured 
AS-i slaves. Configuration can be performed either via STEP 7 (Configuring AS-i slaves 
(Page 40)) or by executing the function "ACTUAL-->PLANNED" (Accessing AS-i analog data 
via acyclic services (Page 52)). 
See also 
Loading the slave configuration (Page 45) 
Using the data record interface (Page 55) 
STEP 7 basic configuration (Page 38) 

Configuring with STEP 7

5.4 Online functions

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5.4.2 Switching operating mode

In STEP 7 "Online" > "Diagnostics" it is possible to switch between protected mode and

configuration mode in the "Functions" section. There are two buttons:

● "Configuration mode"

● "Protected mode"

It can be determined from the LEDs on the AS-i master CM 1243-2, and in STEP 7, which

mode the AS-i master is in. Further information can be found in section "LEDs of the AS-i

master CM 1243-2 (Page 18)".

The operating mode can only be switched when the S7-1200 CPU is in STOP.

Note

Online functions

The online functions can only be performed when at least the basic configuration has been

completed and the S7-1200 station has been loaded.

Configuring with STEP 7

5.4 Online functions

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 45

5.4.3 Loading the slave configuration

Application

This step is only necessary if no AS-i slaves have been configured in STEP 7.

If a slave configuration has already been loaded into the AS-i master CM 1243-2, the

function for loading the slave configuration will be deactivated by the system and can

therefore not be selected.

Prerequisite

The following preconditions must be satisfied to do this:

● The CPU must be in Stop.

● The AS-i master CM 1243-2 must be in configuration mode and must be connected to the

bus. The correct addresses must have been assigned to the AS-i slaves.

Loading the slave configuration

The "ACTUAL -> PLANNED" button can be clicked in the window "Online" > "Diagnostics" to

enable the AS-i master CM 1243-2 to load the configuration of the slaves connected to the

master.

When the function is completed, the CER indication is switched off.

Configuring with STEP 7

5.4 Online functions

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In protected mode the AS-i master CM 1243-2 then only exchanges I/O data with the

detected AS-i slaves.

The following data of the AS-i slaves is saved in non-volatile memory in the AS-i master

CM 1243-2:

● AS-i addresses

● ID codes

● I/O configuration

The button is deactivated if a slave configuration has already been loaded into the

AS-i master CM 1243-2 or the CPU is in "RUN". You can activate the function "ACTUAL -

> PLANNED" again, once you have reloaded the AS-i master CM 1243-2 with the basic

configuration only - that is without configured AS-i slaves - in STEP 7.

5.4.4 Addressing an AS-i slave

A new address can be assigned to an AS-i slave using a selection menu and the button

"Assign AS-i address" in the window "Online" > "Diagnostics". Only free AS-i addresses are

available here.

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 47

Data exchange between the user program and AS-i

slaves 6

In this section you will find information required to access the data of the AS-i slaves from

the AS user program via the AS-i master CM 1243-2. This concerns the transfer of binary

and analog values of the standard or A/B slaves via the AS I/O.

The logical addresses required for this purpose are indicated in STEP 7.

6.1 Transferring AS-i digital values

The S7-1200 CPU accesses the digital inputs and outputs of the AS-i slaves via the

AS-i master CM 1243-2 in cyclic operation. The data is accessed via I/O addresses or by

means of a data record transfer.

6.1.1 Addressing the AS-i slaves

Access to the bits of the AS-i slaves depends on whether the AS-i slaves where configured

in STEP 7 or not.

Data exchange between the user program and AS-i slaves

6.1 Transferring AS-i digital values

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

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Access without configuration of the AS-i slaves with STEP 7

If you have not configured the AS-i slaves in STEP 7, you can access the AS-i digital values

via the I/O area of the SIMATIC.

In this case STEP 7 automatically activates the "System assignment" parameter which

causes a 62 byte long I/O area to be reserved in the SIMATIC. STEP 7 basic configuration

(Page 38)

Within the I/O area, the digital data is accessed in bytes, i.e. one byte is assigned to each

AS-i digital slave. In each case, one byte of output data and one byte of input data is

reserved.

Data exchange between the user program and AS-i slaves

6.1 Transferring AS-i digital values

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 49

The assignment of the AS-i connections of the AS-i digital slaves to the data bits of the

assigned byte is indicated in the inspector window of the AS-i master CM 1243-2:

You can access the data of the AS-i slaves in the user program by means of the displayed

I/O addresses with the appropriate bit logic operations (e.g. "AND") or bit assignments.

Access with configuration of the AS-i slaves with STEP 7

When you configure the AS-i slaves in STEP 7, the I/O address for accessing the data from

the user program is displayed in the inspector window for the respective AS-i slave.

You can access the data of the AS-i slaves in the user program by means of the displayed

I/O addresses with the appropriate bit logic operations (e.g. "AND") or bit assignments.

6.1.2 Special characteristics of Combined Transaction Type Slaves

If you are using the AS-i slaves in accordance with CTT1 ... 5, the "I/O bits" may be used for

special transfer functions. For further details, please refer to the documentation of the

respective AS-i slave.

The following applies to these protocol bits:

● In the input direction, the AS-i master CM 1243-2 sets the value "0".

● In the output direction, the AS-i master CM 1243-2 ignores the bits.

For a description of how to access the AS-i analog slaves, see section "Transferring AS-i

analog values (Page 51)".

Data exchange between the user program and AS-i slaves   
6.2 Cyclic transfer of the slave data in the process image 
  AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
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6.1.3 Special characteristics of AS-i Safety slaves 
The AS-i master CM 1243-2 maps the following states in the process image of an input 
safety slave: 
Table 6- 1  Process image of an input safety slave 
Bit 3  Bit 2  Bit 1  Bit 0  Meaning 
0  0  0  0  All contacts are open. 
0  0  0  1  F-IN1 is closed. 
0  1  0  0  F-IN2 is closed. 
0  1  0  1  F-IN1 and F-IN2 are closed. 
The signal state of the safe AS-i outputs is indicated by the AS-i master in the process image 
as follows. 
Table 6- 2  Process image of output 
Bit 3  Bit 2  Bit 1  Bit 0  Meaning 
0  0  0  0  The safe AS-i output is to be deactivated. 
1  1  1  1  The safe AS-i output is to be activated. 
6.2 Cyclic transfer of the slave data in the process image 
To access the AS-i slave data in the user program via simple commands (e.g. AND 
operations), corresponding input and output addresses are required. 
If slave configuration has been performed, these addresses can be found in the inspector 
window for the respective slave. 
If you have only performed basic configuration, you can find the addresses of the digital 
AS-i slaves in the properties dialog of the AS-i master.  
Access to the values of analog AS-i slaves is only possible via the I/O commands if the 
AS-i slave was configured. In the case of basic configuration, you can only access the data 
via the data record interface (Accessing AS-i analog data via acyclic services (Page 52)). 
See also 
Transferring AS-i analog values (Page 51) 
Loading the slave configuration (Page 45) 
Using the data record interface (Page 55) 
STEP 7 basic configuration (Page 38) 

Data exchange between the user program and AS-i slaves

6.3 Transferring AS-i analog values

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 51

6.3 Transferring AS-i analog values

You can access analog data of an AS-i slave via cyclic services if you have configured this

AS-i slave in STEP 7 as an analog slave (see section "Configuring AS-i slaves (Page 40)").

If you are not configuring any analog slaves, you can only access the data of the AS-i slave

via the acyclic functions (see section "Accessing AS-i analog data via acyclic services

(Page 52)").

Note

The following information is only applicable to AS-i slaves that process analog value transfer

in accordance with the AS-i slave profile 7.3, 7.4, 7.5.5, 7.A.5, B.A.5, 7.A.A, 7.A.8, 7.A.9 or

6.0 (Combined Transaction Types CTT1 ... 5 according to AS-i Specification V3.0).

Analog value transfer according to the older AS-i slave profiles 7.1 and 7.2 is not supported

by the AS-i master CM 1243-2.

The address of the analog slave is displayed in the inspector window of the slave.

Figure 6-1 I/O address analog slave

SIMATIC S7 accesses analog data via word commands, e.g. using the comparator

functions.

The address for accessing multi-channel analog AS-i slaves can be obtained from the table

below:

Table 6- 3 Address area for the analog values of an AS-i slave

Byte no. (start address + offset) Analog value channel

Start address + 0 Channel 1 / high byte

Start address + 1 Channel 1 / low byte

Start address + 2 Channel 2 / high byte

Start address + 3 Channel 2 / low byte

Start address + 4 Channel 3 / high byte

Start address + 5 Channel 3 / low byte

Start address + 6 Channel 4 / high byte

Start address + 7 Channel 4 / low byte

Data exchange between the user program and AS-i slaves

6.3 Transferring AS-i analog values

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

52 Manual, 04/2013, A5E02655230010A/RS-AA/003

Representation of the analog values or the transparent values

The analog values are to be interpreted as 16-bit values in two's complement.

Information about the channel number and resolution is displayed for universal AS-i slaves in

STEP 7 in the field "Configuration".

Information about the data framework of transparent I/O data is also displayed here. In this

type of transfer, the data for the AS-i master is "transparent", i.e. it is transferred from the

AS-i slave to the controller without interpretation of its contents.

For further information about the value range, measuring range and accuracy of the analog

slaves as well as the meaning of transparent data, please refer to the respective

documentation of the AS-i slaves.

6.3.1 Accessing AS-i analog data via acyclic services

If you want to access the data of an analog AS-i slave, but have not configured it in STEP 7

(see section "STEP 7 basic configuration (Page 38)"), you can use the data record interface

(see section "Using the data record interface (Page 55)").

Before the AS-i master 1243-2 can exchange data with the non-configured AS-i slave, the

function "ACTUAL -> PLANNED" must be performed in protected mode (Section "Loading

the slave configuration (Page 45)").

Note

Write accessing of the analog data of an AS-i slave cannot be performed if the slave was

configured using STEP 7.

Data exchange between the user program and AS-i slaves

6.3 Transferring AS-i analog values

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 53

6.3.2 Special cases in analog value transfer

● In the input direction, in the case of failure of a slave or faulty AS-i communication, the

AS-i master CM 1243-2 sends a substitute value:

– For analog slaves with the following profiles, the AS-i master CM 1243-2 transfers

7FFFH as a substitute value:

7.3.4 to 7.3.7

7.3.B to 7.3.F

7.4.1 to 7.4.F

7.A.9

7.A.8 (ID1 = 6)

7.A.8 (ID1 = 7)

7.A.5 and 7.5.5 and B.A.5 (with analog input)

– For analog slaves with the following profiles, the AS-i master CM 1243-2 transfers

0000H as a substitute value:

7.3.0 to 7.3.3

7.3.8 to 7.3.A

7.A.A

7.A.8 (ID1 = 3,4,5)

7.A.5 and 7.5.5 and B.A.5 (with transparent input)

– For all other analog slaves, the assigned analog value is 7FFFH.

● In the output direction, on failure or when the PLC of the controller station is in "Stop", the

AS-i master CM 1243-2 transfers logical "0" to all slaves.

Data exchange between the user program and AS-i slaves

6.3 Transferring AS-i analog values

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

54 Manual, 04/2013, A5E02655230010A/RS-AA/003

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 55

Using the data record interface 7

7.1 Data record interface of the AS-i master CM 1243-2

Meaning and function

With the help of the data record interface, you can completely control the response of the

AS-i master via your user program.

AS-i calls are read and written via the acyclic services. In the user program of the

CPU S7-1200 you can use the blocks "RDREC" (SFB 52, read data record) and "WRREC"

(SFB 53, write data record) for this purpose - see the following table.

'DWDUHFRUG

$6,QWHUIDFH

5HFHLYH

EXIIHUIRU

UHVSRQVH

GDWD

7UDQVPLW

EXIIHUIRU

WDVN

GDWD

$6LVODYHV

$6L

6ODYH

$6L

6ODYH

$6L

6ODYHQ

$6LPDVWHU

&0

'DWDUHFRUG

5HDGGDWDUHFRUG

ದ5HVSRQVH

:ULWHGDWDUHFRUG

ದ7DVN

&38

Calls

The following blocks are used for reading and writing data records:

Table 7- 1 Blocks for reading and writing data records

Call In SIMATIC S7

Read data record RDREC (SFB 52)

Write data record WRREC (SFB 53)

You will find these blocks in STEP 7 in the operations list under "Advanced operations,

distributed I/O"

Using the data record interface

7.1 Data record interface of the AS-i master CM 1243-2

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

56 Manual, 04/2013, A5E02655230010A/RS-AA/003

Call parameters

The following parameters must be assigned to specify the task.

Table 7- 2 Parameters for reading / writing data records

SIMATIC S7 (blocks RDREC / WRREC)

ID:

Hardware ID (HW ID) of the AS-i master CM 1243-2 or AS-i slave.

• Call to an AS-i line:

The hardware ID (HW ID) of the AS-i master CM 1243-2 must be specified here as a

HEX value.

• Call to an AS-i slave:

The hardware ID (HW ID) of the required AS-i slave must be specified here as a HEX

value.

INDEX: Data record number, data format: INT

MLEN: Length for "Read data record"

LEN: Length for "Write data record"

RECORD: Target range for the data record to be read / Source range for the data record to be

written

Return value

The return values of the AS-i master CM 1243-2 can be evaluated in SIMATIC S7 using the

blocks "RDREC" or "WRREC" in the user program. These blocks return a double word in

which the "STATUS" output parameter contains the error information:

You can find information about RECREC and WRREC in the function block help of STEP 7.

Table 7- 3 Error Information

STATUS Value for RDREC Value for WRREC

STATUS[1] DEH DF

STATUS[2] 80H 80

STATUS[3] A0 H A1

STATUS[4] see table below

Using the data record interface

7.1 Data record interface of the AS-i master CM 1243-2

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 57

Device-specific errors of the AS-i master CM 1243-2 for the return value "Status"

Table 7- 4 Error code in "STATUS[4]" of the return values of the AS-i master CM 1243-2

STATUS[4] Meaning

01H Invalid CTT2 index

02H Invalid CTT2 length

04H CTT2 slave is temporarily busy.

05H The requested AS-i slave was not found on the AS-Interface.

06H An AS-i slave with address 0 exists.

07H An AS-i slave with the new address already exists on the AS-Interface.

08H The AS-i slave address cannot be deleted.

09H Error while reading the Extended ID1 code

0AH The AS-i slave address cannot be set.

0BH The AS-i slave address cannot be permanently saved.

21H The AS-i slave address is incorrect.

22H The AS-i slave is not activated (not in LAS).

23H Error on AS-Interface

24H The command is not permitted in the current state of the AS-i master.

25H An AS-i slave with address 0 exists.

26H The AS-i slave has invalid configuration data (I/O or ID codes).

27H The target address is not plausible (e.g. a B slave address is used for a standard slave).

2EH The call number or the call parameter is not known.

2FH The AS-i master has detected an EEPROM error.

31H A length error has occurred on string transfer.

32H A protocol error has occurred on string transfer.

33H CTT2 slave not initialized.

FFH unspecified error

C1H Incorrect analog channel was used.

C2H Insufficient memory.

C3H Invalid or unknown slave detected.

C4H Invalid parameters were used.

C5H Invalid slave profile was used.

C6H Standard slave is not permitted here because a B slave has already been assigned to this

address.

C7H Length invalid.

C8H Invalid value

C9H "Data exchange" is deactivated (data cannot be transferred to the slaves).

D2H AS-i master is too busy (a command is already being executed).

Using the data record interface   
7.2 Description of the AS-i line calls and AS-i slave calls 
  AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
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7.2 Description of the AS-i line calls and AS-i slave calls 
7.2.1 Description of the AS-i line calls and AS-i slave calls 
Overview 
The calls that the CPU of the S7 1200 can issue to the AS-i master CM 1243-2 are 
described below. With these calls, the AS-i master CM 1243-2 makes the complete 
functional scope of the master profile M4 available to the AS-i master specification.  
The calls that can be executed are listed in the following tables: 
● The table "AS-i line calls" contains the calls for the "AS-i line" level. 
● The table "AS-i slave calls" contains the calls for the "AS-i slave" level. 
● The table "AS-i slave calls for slaves according to AS-i specification V3.0 (CTT1, CTT2)" 
contains the calls for the "AS-i slave" level, which are only supported by slaves according 
to AS-i specification V3.0 (CTT slaves). 
Table 7- 5  AS-i line calls 
Name  Function  Index 
(decimal) 
Data in the send or 
receive buffer 
Description in section: 
Configuring actual parameter values 
(Store_Actual_Parameters) 
Write  7  -  "Configuring actual parameter 
values (Store_Actual_Parameters) 
(Page 61)" 
Configuring actual configuration 
data (Store_Actual_Configuration) 
Write  10 / 93  -  "Configuring actual configuration 
data (Store_Actual_Configuration) 
(Page 62)" 
Configure LPS (Set_LPS)  Write  12  LPS  "Configure LPS (Set_LPS) 
(Page 63)" 
Read lists and flags 
(Get_LPS_LAS_LDS_LPF_Flags) 
Read  84  LPS, LAS, LDS, 
LPF, flags 
"Read lists and flags 
(Get_LPS_LAS_LDS_LPF_Flags) 
(Page 64)" 
Read complete configuration 
(Get_LAS_CDI_PI_Flags) 
Read  85  Complete 
configuration (LAS, 
CDI, parameter), 
flags 
"Read complete configuration 
(Get_LAS_CDI_PI_Flags) 
(Page 67)" 
Configure complete configuration 
(Set_LPS_PCD_PP_Flags) 
Write  86  Complete 
configuration (LPS, 
PCD, parameters), 
flags 
"Configure complete configuration 
(Set_LPS_PCD_PP_Flags) 
(Page 70)" 
Set operating mode 
(Set_Operation_Mode) 
Write  17  Mode  "Set operating mode 
(Set_Operation_Mode) (Page 73)" 
Set offline mode (Set_Offline_Mode)  Write  18  Mode  "Set offline mode 
(Set_Offline_Mode) (Page 74)" 
Change AS-i slave address 
(Change_Slave_Address) 
Write  20  Slave addresses  "Change AS-i slave address 
(Change_Slave_Address) 
(Page 75)" 

 Using the data record interface 
  7.2 Description of the AS-i line calls and AS-i slave calls 
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
Manual, 04/2013, A5E02655230010A/RS-AA/003  59 
Name  Function  Index 
(decimal) 
Data in the send or 
receive buffer 
Description in section: 
Select automatic address enable 
(Set_Auto_Addr_Enable) 
Write  21  Mode  "Automatic address programming 
(Set_Auto_Addr_Enable) 
(Page 76)" 
Write AS-i slave extended ID1 
(Write_Extended_ID−Code_1) 
Write  24  ID1 code  "Write AS-i slave extended ID1 
(Write_Extended_ID−Code_1) 
(Page 77)" 
Read AS-i line analog input data 
(Read_AIDI) 
Read  25  Analog input data  "Read AS-i line analog input data 
(Read_AIDI) (Page 78)" 
Write AS-i line analog output data 
(Write_AODI) 
Write  26  Analog output data  "Write AS-i line analog output data 
(Write_AODI) (Page 80)" 
 
Table 7- 6  AS-i slave calls 
Name  Function  Index 
(decimal) 
Data in the send or 
receive buffer 
Description 
Configure parameter value 
(Set_Permanent_Parameter) 
Write  3  Parameter value  "Configure parameter value 
(Set_Permanent_Parameter) 
(Page 81)" 
Read configured parameter value 
(Get_Permanent_Parameter) 
Read  4  Parameter value  "Read configured parameter value 
(Get_Permanent_Parameter) 
(Page 82)" 
Write parameter value 
(Write_Parameter) 
Write  5  Parameter value  "Write parameter value 
(Write_Parameter) (Page 83)" 
Read parameter value 
(Read_Parameter) 
Read  6  Parameter value  "Read parameter value 
(Read_Parameter) (Page 84)" 
Configure configuration data 
(Set_Permanent_Configuration) 
Write  8  Configuration  "Configure configuration data 
(Set_Permanent_Configuration) 
(Page 84)" 
Read configuration data 
(Get_Permanent_Configuration) 
Read  9  Configuration  "Read configuration data 
(Get_Permanent_Configuration) 
(Page 85)" 
Read actual configuration data 
(Read_Actual_Configuration) 
Read  11  Configuration  "Read actual configuration data 
(Read_Actual_Configuration) 
(Page 86)" 
Read AS-i slave I/O 
(Read_I/O_Configuration) 
Read  33  I/O configuration  "Read AS-i slave I/O 
(Read_I/O_Configuration) 
(Page 93)" 
Read AS-i slave ID 
(Read_ID−Code) 
Read  34  ID code  "Read AS-i slave ID 
(Read_ID−Code) (Page 93)" 
Read AS-i slave extended ID1 
(Read_Extended_ID−Code_1) 
Read  24  ID1 code  "Read AS-i slave extended ID1 
(Read_Extended_ID−Code_1) 
(Page 94)" 
Read AS−i slave extended ID2 
(Read_Extended_ID−Code_2) 
Read  35  ID2 code  "Read AS−i slave extended ID2 
(Read_Extended_ID−Code_2) 
(Page 94)" 

Using the data record interface   
7.2 Description of the AS-i line calls and AS-i slave calls 
  AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
60 Manual, 04/2013, A5E02655230010A/RS-AA/003 
Name  Function  Index 
(decimal) 
Data in the send or 
receive buffer 
Description 
Read AS-i slave status 
(Read_Status)  
Read  80  Status of the 
AS-i slave (error 
flags) 
"Read AS-i slave status 
(Read_Status) (Page 95)" 
Read parameter echo 
(Get_Write_Parameter_Echo) 
Read  81  Parameter echo 
value 
"Read parameter echo 
(Get_Write_Parameter_Echo) 
(Page 96)" 
Write AS-i slave analog output data 
(Write_Analog_Output_Data) 
Write  82  Analog output data 
of the AS-i slave 
"Write AS-i slave analog output 
data (Write_Analog_Output_Data) 
(Page 97)" 
Read AS-i slave analog input data 
(Read_Analog_Output_Data) 
Read  83  Analog input data of 
the AS-i slave 
"Read AS-i slave analog input 
data (Read_Analog_Input_Data) 
(Page 98)" 
 
Table 7- 7  AS-i slave calls for slaves according to AS-i specification V3.0 (CTT1, CTT2) 
Name  Function  Index 
(decimal) 
Data in the send or 
receive buffer 
Description 
Read AS-i slave parameter string 
(Read_Parameter_String) 
Read  27  Parameter string  "Read AS-i slave parameter string 
(Read_Parameter_String) 
(Page 87)" 
Write AS-i slave parameter string 
(Write_Parameter_String) 
Write  28  Parameter string  "Write AS-i slave parameter string 
(Write_Parameter_String) 
(Page 88)" 
Read AS-i slave diagnostics string 
(Read_Diagnostic_String) 
Read  29  Diagnostics string  "Read AS-i slave diagnostics 
string (Read_Diagnostic_String) 
(Page 89)" 
Read AS-i slave ID string 
(Read_Identification_String) 
Read  30  ID string  "Read AS-i slave ID string 
(Read_Identification_String) 
(Page 90)" 
Write CTT2 request 
(Write_CTT2_String) 
Write  31  CTT2 string  "Write CTT2 request 
(Write_CTT2_String) (Page 91)" 
Read CTT2 request 
(Read_CTT2_String) 
Read  31  CTT2 string  "Read CTT2 request 
(Read_CTT2_String) (Page 92)" 

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 61

7.2.2 AS-i line calls

7.2.2.1 Configuring actual parameter values (Store_Actual_Parameters)

Meaning

With this call, the current parameters of the AS-i slave are written from the volatile memory

of the AS-i master CM 1243-2 to its retentive memory.

In the factory setting, the bits of the AS-i slave parameters in the AS-i master CM 1243-2 are

all assigned the value 1.

The following information must be transferred to the "WRREC" instruction as parameters.

● INDEX:7

● RECORD:2 bytes

Table 7- 8 Structure of the utility WRREC - Index 7

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 0000H

1 0000H

You can find information about "Parameters" and the ID codes for the "Configuration" (I/O

configuration, ID code, ID1 code, and ID2 code) in the manual "AS-Interface − Introduction

and Basic Information" (Order No: 6GK1 971-2SA01-0AA0). The manual is available on the

Internet (http://support.automation.siemens.com/WW/view/en/5581657).

Exceptions

There are a few AS-i slave types for which the AS-i master administers the slave

parameterization itself. The configured parameters for these AS-i slaves are always equal to

FH.

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

62 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.2.2 Configuring actual configuration data (Store_Actual_Configuration)

Meaning

With this call, the (ACTUAL) configuration data of all AS-i slaves determined in the

AS-Interface (I/O configuration, ID code, ID1 code, and ID2 code) are stored in non-volatile

memory as (PLANNED) configuration data. The list of activated AS-i slaves (LAS) is also

accommodated into the list of configured AS-i slaves (LPS).

When this call is executed, the AS-i master CM 1243-2 switches to the offline phase and

switches back to normal mode again (restart of the AS-i line).

The function can be called using two different data records: If Index 10 is used, the call is

performed only if the AS-i master is in the configuration mode.

If Index 93 is used, the call is performed also in protected mode.

Independent of the index used, the function cannot be performed when an AS-i slave

configuration has already been specified with STEP 7 and loaded into the AS-i master.

Two bytes of version information must be transferred as useful data for the utility WRREC -

Index 10 / 93. These two bytes must be filled with "0".

Table 7- 9 Structure of the utility WRREC - Index 10 / 93

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

You can find information about "Parameters" and the ID codes for the "Configuration" (I/O

configuration, ID code, ID1 code, and ID2 code) in the manual "AS-Interface − Introduction

and Basic Information" (Order No: 6GK1971-2SA01-0AA0). The manual is available on the

Internet (http://support.automation.siemens.com/WW/view/de/1171856/0/en).

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 63

7.2.2.3 Configure LPS (Set_LPS)

Meaning

This call transfers the list of configured AS-i slaves for non-volatile storage in the master.

When this call is executed, the AS-i master CM 1243-2 switches to the offline phase and

switches back to normal mode again (restart of the AS-i line).

This call is not executed in protected mode.

The function cannot be performed when an AS-i slave configuration has already been loaded

from STEP 7 into the AS-i master CM 1243-2.

Structure of the utility WRREC − Index 12

Meaning

Byte

Bit 9 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 Slave

7/7A

Slave

6/6A

Slave

5/5A

Slave

4/4A

Slave

3/3A

Slave

2/2A

Slave

1/1A

Slave

0/0A

3 Slave

15/15A

Slave

14/14A

Slave

13/13A

Slave

12/12A

Slave

11/11A

Slave

10/10A

Slave

9/9A

Slave

8/8A

4 Slave

23/23A

Slave

22/22A

Slave

21/21A

Slave

20/20A

Slave

19/19A

Slave

18/18A

Slave

17/17A

Slave

16/16A

5 Slave

31/31A

Slave

30/30A

Slave

29/29A

Slave

28/28A

Slave

27/27A

Slave

26/26A

Slave

25/25A

Slave

24/24A

6 Slave

Slave

7 Slave

15B

Slave

14B

Slave

13B

Slave

12B

Slave

11B

Slave

10B

Slave

8 Slave

23B

Slave

22B

Slave

21B

Slave

20B

Slave

19B

Slave

18B

Slave

17B

Slave

16B

9 Slave

31B

Slave

30B

Slave

29B

Slave

28B

Slave

27B

Slave

26B

Slave

25B

Slave

24B

Reserved 0x0000

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

64 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.2.4 Read lists and flags (Get_LPS_LAS_LDS_LPF_Flags)

Meaning

The following entries are read from the AS-i master CM 1243-2 with this call:

● List of configured AS-i slaves LPS

● List of activated AS-i slaves LAS

● List of detected AS-i slaves LDS

● List of active I/O faults for the activated AS-i slaves LPF

● Flags in accordance with the AS-i slave specification

Structure of the response data of the utility RDREC − Index 84

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_hi = 0x00

2 LAS

Slave

7/7A

LAS

Slave

6/6A

LAS

Slave

5/5A

LAS

Slave

4/4A

LAS

Slave

3/3A

LAS

Slave

2/2A

LAS

Slave

1/1A

LAS

Slave

0/0A

3 LAS

Slave

15/15A

LAS

Slave

14/14A

LAS

Slave

13/13A

LAS

Slave

12/12A

LAS

Slave

11/11A

LAS

Slave

10/10A

LAS

Slave

9/9A

LAS

Slave

8/8A

4 LAS

Slave

23/23A

LAS

Slave

22/22A

LAS

Slave

21/21A

LAS

Slave

20/20A

LAS

Slave

19/19A

LAS

Slave

18/18A

LAS

Slave

17/17A

LAS

Slave

16/16A

5 LAS

Slave

31/31A

LAS

Slave

30/30A

LAS

Slave

29/29A

LAS

Slave

28/28A

LAS

Slave

27/27A

LAS

Slave

26/26A

LAS

Slave

25/25A

LAS

Slave

24/24A

6 LAS

Slave 7B

LAS

Slave 6B

LAS

Slave 5B

LAS

Slave 4B

LAS

Slave 3B

LAS

Slave 2B

LAS

Slave 1B

LAS

Slave 0B

7 LAS

Slave 15B

LAS

Slave 14B

LAS

Slave 13B

LAS

Slave 12B

LAS

Slave 11B

LAS

Slave 10B

LAS

Slave 9B

LAS

Slave 8B

8 LAS

Slave 23B

LAS

Slave 22B

LAS

Slave 21B

LAS

Slave 20B

LAS

Slave 19B

LAS

Slave 18B

LAS

Slave 17B

LAS

Slave 16B

9 LAS

Slave 31B

LAS

Slave 30B

LAS

Slave 29B

LAS

Slave 28B

LAS

Slave 27B

LAS

Slave 26B

LAS

Slave 25B

LAS

Slave 24B

10 LDS

Slave

7/7A

LDS

Slave

6/6A

LDS

Slave

5/5A

LDS

Slave

4/4A

LDS

Slave

3/3A

LDS

Slave

2/2A

LDS

Slave

1/1A

LDS

Slave

0/0A

11 LDS

Slave

15/15A

LDS

Slave

14/14A

LDS

Slave

13/13A

LDS

Slave

12/12A

LDS

Slave

11/11A

LDS

Slave

10/10A

LDS

Slave

9/9A

LDS

Slave

8/8A

12 LDS

Slave

23/23A

LDS

Slave

22/22A

LDS

Slave

21/21A

LDS

Slave

20/20A

LDS

Slave

19/19A

LDS

Slave

18/18A

LDS

Slave

17/17A

LDS

Slave

16/16A

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 65

Meaning Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

13 LDS

Slave

31/31A

LDS

Slave

30/30A

LDS

Slave

29/29A

LDS

Slave

28/28A

LDS

Slave

27/27A

LDS

Slave

26/26A

LDS

Slave

25/25A

LDS

Slave

24/24A

14 LDS

Slave 7B

LDS

Slave 6B

LDS

Slave 5B

LDS

Slave 4B

LDS

Slave 3B

LDS

Slave 2B

LDS

Slave 1B

LDS

Slave 0B

15 LDS

Slave 15B

LDS

Slave 14B

LDS

Slave 13B

LDS

Slave 12B

LDS

Slave 11B

LDS

Slave 10B

LDS

Slave 9B

LDS

Slave 8B

16 LDS

Slave 23B

LDS

Slave 22B

LDS

Slave 21B

LDS

Slave 20B

LDS

Slave 19B

LDS

Slave 18B

LDS

Slave 17B

LDS

Slave 16B

17 LDS

Slave 31B

LDS

Slave 30B

LDS

Slave 29B

LDS

Slave 28B

LDS

Slave 27B

LDS

Slave 26B

LDS

Slave 25B

LDS

Slave 24B

18 LPS

Slave

7/7A

LPS

Slave

6/6A

LPS

Slave

5/5A

LPS

Slave

4/4A

LPS

Slave

3/3A

LPS

Slave

2/2A

LPS

Slave

1/1A

LPS

Slave

0/0A

19 LPS

Slave

15/15A

LPS

Slave

14/14A

LPS

Slave

13/13A

LPS

Slave

12/12A

LPS

Slave

11/11A

LPS

Slave

10/10A

LPS

Slave

9/9A

LPS

Slave

8/8A

20 LPS

Slave

23/23A

LPS

Slave

22/22A

LPS

Slave

21/21A

LPS

Slave

20/20A

LPS

Slave

19/19A

LPS

Slave

18/18A

LPS

Slave

17/17A

LPS

Slave

16/16A

21 LPS

Slave

31/31A

LPS

Slave

30/30A

LPS

Slave

29/29A

LPS

Slave

28/28A

LPS

Slave

27/27A

LPS

Slave

26/26A

LPS

Slave

25/25A

LPS

Slave

24/24A

22 LPS

Slave 7B

LPS

Slave 6B

LPS

Slave 5B

LPS

Slave 4B

LPS

Slave 3B

LPS

Slave 2B

LPS

Slave 1B

LPS

Slave 0B

23 LPS

Slave 15B

LPS

Slave 14B

LPS

Slave 13B

LPS

Slave 12B

LPS

Slave 11B

LPS

Slave 10B

LPS

Slave 9B

LPS

Slave 8B

24 LPS

Slave 23B

LPS

Slave 22B

LPS

Slave 21B

LPS

Slave 20B

LPS

Slave 19B

LPS

Slave 18B

LPS

Slave 17B

LPS

Slave 16B

25 LPS

Slave 31B

LPS

Slave 30B

LPS

Slave 29B

LPS

Slave 28B

LPS

Slave 27B

LPS

Slave 26B

LPS

Slave 25B

LPS

Slave 24B

26 LPF

Slave

7/7A

LPF

Slave

6/6A

LPF

Slave

5/5A

LPF

Slave

4/4A

LPF

Slave

3/3A

LPF

Slave

2/2A

LPF

Slave

1/1A

LPF

Slave

0/0A

27 LPF

Slave

15/15A

LPF

Slave

14/14A

LPF

Slave

13/13A

LPF

Slave

12/12A

LPF

Slave

11/11A

LPF

Slave

10/10A

LPF

Slave

9/9A

LPF

Slave

8/8A

28 LPF

Slave

23/23A

LPF

Slave

22/22A

LPF

Slave

21/21A

LPF

Slave

20/20A

LPF

Slave

19/19A

LPF

Slave

18/18A

LPF

Slave

17/17A

LPF

Slave

16/16A

29 LPF

Slave

31/31A

LPF

Slave

30/30A

LPF

Slave

29/29A

LPF

Slave

28/28A

LPF

Slave

27/27A

LPF

Slave

26/26A

LPF

Slave

25/25A

LPF

Slave

24/24A

30 LPF

Slave 7B

LPF

Slave 6B

LPF

Slave 5B

LPF

Slave 4B

LPF

Slave 3B

LPF

Slave 2B

LPF

Slave 1B

LPF

Slave 0B

31 LPF

Slave 15B

LPF

Slave 14B

LPF

Slave 13B

LPF

Slave 12B

LPF

Slave 11B

LPF

Slave 10B

LPF

Slave 9B

LPF

Slave 8B

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

66 Manual, 04/2013, A5E02655230010A/RS-AA/003

Meaning Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

32 LPF

Slave 23B

LPF

Slave 22B

LPF

Slave 21B

LPF

Slave 20B

LPF

Slave 19B

LPF

Slave 18B

LPF

Slave 17B

LPF

Slave 16B

33 LPF

Slave 31B

LPF

Slave 30B

LPF

Slave 29B

LPF

Slave 28B

LPF

Slave 27B

LPF

Slave 26B

LPF

Slave 25B

LPF

Slave 24B

34 Flag 1

35 Flag 2

Meaning of the bits in Byte 0 to Byte 33

● Bit = 0:

LAS (Byte 2 ... 9): The AS-i slave is not activated

LDS (Byte 10 ... 17): The AS-i slave was not detected

LPS (Byte 18 ... 25): The AS-i slave is not configured

LPF (Byte 26 ... 33): The AS-i slave signals no I/O fault

● Bit = 1:

LAS (Byte 2 ... 9): The AS-i slave is activated

LDS (Byte 10 ... 17): The AS-i slave has been detected

LPS (Byte 18 ... 25): The AS-i slave is configured

LPF (Byte 26 ... 33): The AS-i slave signals I/O faults

Flag 1 Flag 2

Bit Meaning

0 CONFIG_OK 0 PERIPHERY_OK

1 LDS_0 1 DATA_EXCHANGE_ACTIVE

2 AUTO_ADDR_ASSIGN 2 OFFLINE

3 AUTO_ADDR_AVAIL 3 AUTO_ADDR_ENABLE

4 OPERATING MODE 4 Reserved

5 NORMAL_OPERATION 5 EPROM_OK

6 APF 6 Reserved

7 OFFLINE_READY 7 Reserved

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 67

Meaning of the flags

Flag Meaning

CONFIG_OK The flag is set when the planned configuration (configured) and the actual

configuration match.

LDS_0 The flag is set if an AS-i slave with operating address 0 is available.

AUTO_ADDR_ASSIGN The flag is set if automatic address programming is possible

(i.e. SET_AUTO_ADDR_ENABLE = 1 and no "incorrect" AS-i slave is connected to

AS-Interface).

AUTO_ADDR_AVAIL The flag is set if automatic address programming can be performed (i.e. exactly one

AS-i slave has currently failed).

OPERATING MODE The flag is set in configuration mode and reset in protected mode.

NORMAL_OPERATION The flag is set when the AS-i master CM 1243-2 is in normal operation.

(The flag is set when the link is in normal operation)

APF The flag is set if the voltage on the AS-i cable is too low.

OFFLINE_READY The flag is set if the offline phase is active.

PERIPHERY_OK The flag is set if at least one AS-i slave signals a peripheral fault.

DATA_EXCHANGE_ACTIVE The flag "DATA_EXCHANGE_ACTIVE" is set when cyclic data traffic is in normal

operation.

OFFLINE The flag is set if the operating status OFFLINE is to be adopted or has already been

adopted.

AUTO_ADDR_ENABLE The flag indicates whether automatic address programming by the user is disabled

(BIT = 0) or enabled (BIT = 1).

EPROM_OK The flag is set if the EPROM of the device is OK.

7.2.2.5 Read complete configuration (Get_LAS_CDI_PI_Flags)

Meaning

The following data is read from the AS-i master CM 1243-2 with this call:

● The list of active AS-i slaves (LAS). It specifies which of the connected AS-i slaves are

activated.

● The current configuration data of the connected AS-i slaves (I/O configuration, ID code,

ID1 code, ID2 code);

● The current parameters of the AS-i slaves (actual parameters);

● The current flags.

The call can be used, for example, to determine the configuration of the stations

connected to the AS-i cable after commissioning.

These read-in configuration data can be modified if required and stored in the

AS-i master CM 1243-2 as the planned configuration with the command "Configure

complete configuration" (see section "Configure complete configuration

(Set_LPS_PCD_PP_Flags) (Page 70)").

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

68 Manual, 04/2013, A5E02655230010A/RS-AA/003

Structure of the response data of the utility RDREC − Index 85

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_hi = 0x00

2 LAS

Slave

7/7A

LAS

Slave

6/6A

LAS

Slave

5/5A

LAS

Slave

4/4A

LAS

Slave

3/3A

LAS

Slave

2/2A

LAS

Slave

1/1A

LAS

Slave

0/0A

3 LAS

Slave

15/15A

LAS

Slave

14/14A

LAS

Slave

13/13A

LAS

Slave

12/12A

LAS

Slave

11/11A

LAS

Slave

10/10A

LAS

Slave

9/9A

LAS

Slave

8/8A

4 LAS

Slave

23/23A

LAS

Slave

22/22A

LAS

Slave

21/21A

LAS

Slave

20/20A

LAS

Slave

19/19A

LAS

Slave

18/18A

LAS

Slave

17/17A

LAS

Slave

16/16A

5 LAS

Slave

31/31A

LAS

Slave

30/30A

LAS

Slave

29/29A

LAS

Slave

28/28A

LAS

Slave

27/27A

LAS

Slave

26/26A

LAS

Slave

25/25A

LAS

Slave

24/24A

6 LAS

Slave 7B

LAS

Slave 6B

LAS

Slave 5B

LAS

Slave 4B

LAS

Slave 3B

LAS

Slave 2B

LAS

Slave 1B

LAS

Slave 0B

7 LAS

Slave 15B

LAS

Slave 14B

LAS

Slave 13B

LAS

Slave 12B

LAS

Slave 11B

LAS

Slave 10B

LAS

Slave 9B

LAS

Slave 8B

8 LAS

Slave 23B

LAS

Slave 22B

LAS

Slave 21B

LAS

Slave 20B

LAS

Slave 19B

LAS

Slave 18B

LAS

Slave 17B

LAS

Slave 16B

9 LAS

Slave 31B

LAS

Slave 30B

LAS

Slave 29B

LAS

Slave 28B

LAS

Slave 27B

LAS

Slave 26B

LAS

Slave 25B

LAS

Slave 24B

10 I/O configuration Slave 0 ID_CODE Slave 0

11 ID1_Code Slave 0 ID2_Code Slave 0

12 I/O configuration Slave 1 ID_CODE Slave 1

13 ID1_Code Slave 1 ID2_Code Slave 1

... ... ...

72 I/O configuration Slave 31 ID_CODE Slave 31

73 ID1_Code Slave 31 ID2_Code Slave 31

Reserved 0x0000

76 I/O configuration Slave 1B ID_CODE Slave 1B

77 ID1_Code Slave 1B ID2_Code Slave 1B

78 I/O configuration Slave 2B ID_CODE Slave 2B

79 ID1_Code Slave 2B ID2_Code Slave 2B

... ... ...

136 I/O configuration Slave 31B ID_CODE Slave 31B

137 ID1_Code Slave 31B ID2_Code Slave 31B

138 Reserved 0x00 Parameter Slave 1/1A

Parameter 2/2A Parameter 3/3A 139

P3 P2 P1 P0 P3 P2 P1 P0

... ... ...

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 69

Meaning Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Parameter 30/30A Parameter 31/31A

153

P3 P2 P1 P0 P3 P2 P1 P0

Parameter 1B 154 Reserved 0x00

P3 P3 P3 P3

Parameter 2B Parameter 3B 155

P3 P2 P1 P0 P3 P2 P1 P0

... ... ...

Parameter 30B Parameter 31B 169

P3 P2 P1 P0 P3 P2 P1 P0

170 Flag 1

171 Flag 2

Flag 1 Flag 2

Bit Meaning

0 CONFIG_OK 0 PERIPHERY_OK

1 LDS_0 1 DATA_EXCHANGE_ACTIVE

2 AUTO_ADDR_ASSIGN 2 OFFLINE

3 AUTO_ADDR_AVAIL 3 AUTO_ADDR_ENABLE

4 OPERATING MODE 4 Reserved

5 NORMAL_OPERATION 5 EPROM_OK

6 APF 6 Reserved

7 OFFLINE_READY 7 Reserved

Reference

The meaning of the flags is the same as for the job "Read lists and flags"

(Get_LPS_LAS_LDS_LPF_Flags, section "Read lists and flags

(Get_LPS_LAS_LDS_LPF_Flags) (Page 64)").

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

70 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.2.6 Configure complete configuration (Set_LPS_PCD_PP_Flags)

Meaning

With this call, the desired overall configuration of the AS-Interface is transferred to the

AS-i master CM 1243-2 and stored in non-volatile memory as the planned configuration.

This configures the AS-i master CM 1243-2.

Specifically, the following data are transferred:

● The list of configured AS-i slaves that defines which AS-i slaves may be activated by the

AS-i master CM 1243-2 in protected mode;

● The list of configuration data which specifies which ID codes and which I/O configuration

the connected AS-i slaves must have;

● The list of the AS-i slave parameters that have been configured in the AS-i master

CM 1243-2 and stored in non-volatile memory. These parameters are transferred to the

AS-i slaves when the AS-i master CM 1243-2 starts up;

● The flags that determine the operating state of the AS-i master CM 1243-2 after startup.

Exceptions

There are a few AS-i slave types for which the AS-i master CM 1243-2 administers the slave

parameterization itself. The configured parameters for these AS-i slaves are always equal to

FH. The parameter values specified in the call are ignored by the AS-i master CM 1243-2 for

these slave types.

The function cannot be performed when an AS-i slave configuration has already been loaded

from STEP 7 into the AS-i master CM 1243-2.

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 71

Structure of the utility WRREC − Index 86

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_hi = 0x00

2 LAS

Slave

7/7A

LAS

Slave

6/6A

LAS

Slave

5/5A

LAS

Slave

4/4A

LAS

Slave

3/3A

LAS

Slave

2/2A

LAS

Slave

1/1A

LAS

Slave

0/0A

3 LAS

Slave

15/15A

LAS

Slave

14/14A

LAS

Slave

13/13A

LAS

Slave

12/12A

LAS

Slave

11/11A

LAS

Slave

10/10A

LAS

Slave

9/9A

LAS

Slave

8/8A

4 LAS

Slave

23/23A

LAS

Slave

22/22A

LAS

Slave

21/21A

LAS

Slave

20/20A

LAS

Slave

19/19A

LAS

Slave

18/18A

LAS

Slave

17/17A

LAS

Slave

16/16A

5 LAS

Slave

31/31A

LAS

Slave

30/30A

LAS

Slave

29/29A

LAS

Slave

28/28A

LAS

Slave

27/27A

LAS

Slave

26/26A

LAS

Slave

25/25A

LAS

Slave

24/24A

6 LAS

Slave 7B

LAS

Slave 6B

LAS

Slave 5B

LAS

Slave 4B

LAS

Slave 3B

LAS

Slave 2B

LAS

Slave 1B

LAS

Slave 0B

7 LAS

Slave 15B

LAS

Slave 14B

LAS

Slave 13B

LAS

Slave 12B

LAS

Slave 11B

LAS

Slave 10B

LAS

Slave 9B

LAS

Slave 8B

8 LAS

Slave 23B

LAS

Slave 22B

LAS

Slave 21B

LAS

Slave 20B

LAS

Slave 19B

LAS

Slave 18B

LAS

Slave 17B

LAS

Slave 16B

9 LAS

Slave 31B

LAS

Slave 30B

LAS

Slave 29B

LAS

Slave 28B

LAS

Slave 27B

LAS

Slave 26B

LAS

Slave 25B

LAS

Slave 24B

10 I/O configuration Slave 0 ID_CODE Slave 0

11 ID1_Code Slave 0 ID2_Code Slave 0

12 I/O configuration Slave 1 ID_CODE Slave 1

13 ID1_Code Slave 1 ID2_Code Slave 1

... ... ...

72 I/O configuration Slave 31 ID_CODE Slave 31

73 ID1_Code Slave 31 ID2_Code Slave 31

Reserved 0x0000

76 I/O configuration Slave 1B ID_CODE Slave 1B

77 ID1_Code Slave 1B ID2_Code Slave 1B

78 I/O configuration Slave 2B ID_CODE Slave 2B

79 ID1_Code Slave 2B ID2_Code Slave 2B

... ... ...

136 I/O configuration Slave 31B ID_CODE Slave 31B

137 ID1_Code Slave 31B ID2_Code Slave 31B

138 Reserved 0x00 Parameter Slave 1/1A

Parameter 2/2A Parameter 3/3A 139

P3 P2 P1 P0 P3 P2 P1 P0

... ... ...

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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72 Manual, 04/2013, A5E02655230010A/RS-AA/003

Byte Meaning

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

153 Parameter 30/30A Parameter 31/31A

P3 P2 P1 P0 P3 P2 P1 P0

154 Reserved 0x00 Parameter 1/1B

P3 P3 P3 P3

155 Parameter 2/2B Parameter 3/3B

P3 P2 P1 P0 P3 P2 P1 P0

... ... ...

169 Parameter 30/30B Parameter 31/31B

P3 P2 P1 P0 P3 P2 P1 P0

170 Flag 1

171 Flag 2

Flag 1 Flag 2

Bit Meaning Bit Meaning

0 CONFIG_OK 0 PERIPHERY_OK

1 LDS_0 1 DATA_EXCHANGE_ACTIVE

2 AUTO_ADDR_ASSIGN 2 OFFLINE

3 AUTO_ADDR_AVAIL

AUTO_ADDR_ENABLE

OPERATING MODE

4 Reserved

5 NORMAL_OPERATION 5 EPROM_OK

6 APF 6 Reserved

7 OFFLINE_READY 7 Reserved

In the table, the lines of those flags whose values change the operating mode of the

AS-i master CM 1243-2 (OPERATING MODE, AUTO_ADDR_ENABLE) are shown in

italics

The values of the remaining flags are insignificant for the call "Configure complete

configuration" and cannot be modified in the AS-i master CM 1243-2 by this call.

The flags have the same meaning as for the call "Read lists and flags

(Get_LPS_LAS_LDS_LPF_Flags) (Page 64)".

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 73

7.2.2.7 Set operating mode (Set_Operation_Mode)

Meaning

You can choose between "Configuration mode" and "Protected mode" with this call.

In protected mode (operating mode), only those AS-i slaves are activated that are marked in

the LPS and whose actual and planned configurations match, i.e. if the I/O configuration and

the ID codes of the detected AS-i slaves are identical to the configured values.

In configuration mode, all the detected AS-i slaves are activated (with the exception of

AS-i slave "0"). AS-i slaves which differ in their actual and planned configurations are also

activated.

The bit "OPERATING MODE" is saved in non-volatile memory, i.e. its setting is retained

even after start-up / restart.

The following bit assignment applies to the operating mode:

● Protected mode: "0"

● Configuration mode: "1"

On changeover from configuration mode to protected mode, the AS-i master is restarted

(transition to the offline phase and subsequent changeover to online mode).

Note

If an AS-i slave with the operating address 0 is entered in the LDS, the AS-i master CM

1243-2 cannot switch from configuration mode to protected mode.

Structure of the utility WRREC − Index 17

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 0 0 0 0 0 0 0 Mode

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

74 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.2.8 Set offline mode (Set_Offline_Mode)

Meaning

This call switches between online and offline mode.

Online mode

Online mode is the normal mode for the AS-i master. The following jobs are processed

cyclically here:

● In the "data exchange phase", the fields of the output data are transferred to the slave

outputs for all activated AS-i slaves. In error-free transmission, the addressed AS-i slaves

transfer the values of the slave inputs to the master.

● This is followed by the "acceptance phase" in which a search is made for the available

AS-i slaves and newly added AS-i slaves are accepted into the LDS or LAS.

● In the "management phase", jobs forwarded by the user, such as writing parameters, are

executed.

Offline mode

In offline mode, the AS-i master CM 1243-2 only processes calls from the user. Calls that

immediately activate an AS-i slave are rejected with an error. Cyclic data exchange is not

performed with the AS-i slaves.

Bit assignment

The following bit assignment applies to online/offline mode:

● Online mode: "0"

● Offline mode: "1"

The bit OFFLINE = TRUE is not permanently stored, i.e. following a start/restart, the

AS-i master CM 1243-2 returns to online mode.

Structure of the utility WRREC − Index 18

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 0 0 0 0 0 0 0 Mode

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 75

7.2.2.9 Change AS-i slave address (Change_Slave_Address)

Meaning

This call can be used to change the AS-i address of an AS-i slave.

This call is used predominantly for adding a new AS-i slave with the default address "0" to

the AS-Interface. In this case, the address is changed from the "AS-i slave address, old"

(= 0) to the "AS-i slave address, new".

The change is only executed if the following conditions are met:

1. An AS-i slave with the "AS-i slave address, old" must exist.

2. When changing the AS-i slave address, the address is initially set to "0". No other slave

with the address "0" may be connected.

3. "AS-i slave address, new" must have a valid value.

4. An AS-i slave with "AS-i slave address, new" must not already exist.

Structure of the utility WRREC − Index 20

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 AS-i address old

3 AS-i address new

To address slaves with a "B" address, you must add the value "32" to the AS-i address.

Example: The AS-i slave with address "1B" must be changed to address "2B". In this case,

the value "33" must be transferred as "AS-i address old" and the value "34" as "AS-i address

new".

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

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7.2.2.10 Automatic address programming (Set_Auto_Addr_Enable)

Meaning

The function "Automatic address programming" can be enabled or disabled for the

AS-i slave of a line with this call (see also section "Replacing a defective AS-i slave /

automatic address programming (Page 105)").

● Mode = 0: Automatic address programming disabled

● Mode = 1: Automatic address programming enabled

The bit "Set_Auto_Addr_Enable" is saved in non-volatile memory, i.e. its setting is retained

even after start-up/restart of the AS-i master.

Structure of the utility WRREC − Index 21

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 0 0 0 0 0 0 0 Mode

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 77

7.2.2.11 Write AS-i slave extended ID1 (Write_Extended_ID−Code_1)

Meaning

The extended ID1 code of an AS-i slave with the address "0" can be directly written via the

AS-i cable with this call.

The AS-i master forwards the extended ID1 code to the AS-i slave without validity check.

The ID1 code is stored in the AS-i slave in non-volatile memory. In the AS-i master, the ID1

code is stored in CDI (RAM) non-retentively.

Structure of the utility WRREC − Index 24

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 0x0 ID1 code

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

78 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.2.12 Read AS-i line analog input data (Read_AIDI)

Meaning

This call reads out the process image of the analog input data of the AS-i line of an

AS-i master.

Structure of the utility RDREC − Index 25

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

Slave 1, Channel 1 or Slave 1A, Channel 1

Slave 1, Channel 2 or Slave 1A, Channel 2

Slave 1, Channel 3 or Slave 1B, Channel 1

Slave 1, Channel 4 or Slave 1B, Channel 2

...

242

243

Slave 31, Channel 1 or Slave 31A, Channel 1

244

245

Slave 31, Channel 2 or Slave 31A, Channel 2

246

247

Slave 31, Channel 3 or Slave 31B, Channel 1

248

249

Slave 31, Channel 4 or Slave 31B, Channel 2

Mapping of the analog values in the data record on accessing the complete line

You can use analog value access to the complete AS-i line to save I/O address space in the

S7 station.

For each slave address, an area of 8 bytes is used to administer four analog channels. The

table below shows the address area of the data record into which the analog values from a

specific AS-i slave are transferred.

The table applies equally to the analog input area and to the analog output area.

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 79

Access to analog values of an AS-i line via data records

Address of AS-i slave Start addresses for analog values in

data record 25 or 26

1 2

2 10

3 18

4 26

5 34

6 42

7 50

8 58

9 66

10 74

11 82

12 90

13 98

14 106

15 114

16 122

17 130

18 138

19 146

20 154

21 162

22 170

23 178

24 186

25 194

26 202

27 210

28 218

29 226

30 234

31 242

Examples for accesses:

Analog channel 1 is accessed by Slave 7 with an offset of 50.

Analog channel 1 is accessed by Slave 30B with an offset of 238.

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

80 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.2.13 Write AS-i line analog output data (Write_AODI)

Meaning

This call writes the process image of the analog output data of the AS-i line of an

AS-i master.

Structure of the utility WRREC − Index 26

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

Slave 1, Channel 1 or Slave 1A, Channel 1

Slave 1, Channel 2 or Slave 1A, Channel 2

Slave 1, Channel 3 or Slave 1B, Channel 1

Slave 1, Channel 4 or Slave 1B, Channel 2

...

242

243

Slave 31, Channel 1 or Slave 31A, Channel 1

244

245

Slave 31, Channel 2 or Slave 31A, Channel 2

246

247

Slave 31, Channel 3 or Slave 31B, Channel 1

248

249

Slave 31, Channel 4 or Slave 31B, Channel 2

You can use analog value access to the complete AS-i line to save I/O address space in the

S7 station.

Note

For mapping the analog values in the data record, see section "Read AS-i line analog input

data (Read_AIDI) (Page 78)".

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 81

Note

Write access to analog data

Write accessing of the analog data of an AS-i slave cannot be performed if the slave was

configured using STEP 7.

7.2.3 AS-i slave calls

7.2.3.1 Configure parameter value (Set_Permanent_Parameter)

Meaning

This call configures a parameter value for the specified AS-i slave in the

AS-i master CM 1243-2. The value is saved in non-volatile memory of the

AS−i master CM 1243-2.

The configured parameter is not transferred to the AS-i slave immediately by the

AS-i master CM 1243-2.

After the call, the AS-i master CM 1243-2 switches to offline mode and switches back to

normal mode again (restart of the AS-i master).

For some AS-i slave profiles (Combined Transaction Type), the AS-i master CM 1243-2

itself administers the AS-i slave parameterization. In these cases, the parameters in the call

are ignored.

Structure of the utility WRREC − Index 3

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

Parameters 2 0x0

P3 P2 P1 P0

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

82 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.3.2 Read configured parameter value (Get_Permanent_Parameter)

Meaning

With this call, the slave-specific parameters stored in the AS-i master CM 1243-2 are read.

The job cannot be used for all slaves of the Combined Transaction Type.

Structure of the utility RDREC − Index 4

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

Parameters 2 0x0

P3 P2 P1 P0

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 83

7.2.3.3 Write parameter value (Write_Parameter)

Meaning

The parameters transferred in the call are forwarded to the addressed AS-i slave. The

parameters are stored in non-volatile memory on the AS-i master CM 1243-2.

The AS-i slave transfers its current status as a parameter echo in the response. The

response can deviate from the value just written.

Exceptions

There are a few AS-i slave types for which the AS-i master administers the slave

parameterization itself. The configured parameters for these AS-i slaves are always equal to

FH. For these slaves, the AS-i master itself administers the AS-i slave parameterization.

Structure of the utility WRREC − Index 5

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

Parameters 2 0x0

P3 P2 P1 P0

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

84 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.3.4 Read parameter value (Read_Parameter)

Meaning

This call reads the current parameter of an AS-i slave from the AS-i master CM 1243-2.

This value must not be confused with the parameter echo in section "Read parameter echo

(Get_Write_Parameter_Echo) (Page 96)", which the AS-i slave supplies as a response to the

job "Write parameter value".

Structure of the utility RDREC − Index 6

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

Parameters 2 0x0

P3 P2 P1 P0

3 Reserved 0x00

7.2.3.5 Configure configuration data (Set_Permanent_Configuration)

Meaning

With this call, the following configuration data are configured for the addressed AS-i slave.

● I/O configuration

● ID code

● ID1 code

● ID2 code

The configuration data is saved in non-volatile memory of the AS−i master CM 1243-2. The

AS-i master uses the configuration data as the planned data for protected mode. This call is

not executed in protected mode.

The configuration data are defined by the manufacturer of the AS-i slave. The meaning of

the configuration data is described in the AS-i master specification "AS-Interface Complete

Specification". If the addressed AS-i slave does not support extended ID code 1 / 2, the

value FH must be specified for this in the call.

When this call is executed, the AS-i master switches to the offline phase and switches back

to normal mode again (restart of the AS-i line).

The call can only be executed in configuration mode.

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 85

Note

Non-executable function for previously loaded AS-i slave configuration

The function cannot be performed when an AS-i slave configuration has already been loaded

from STEP 7 into the AS-i master CM 1243-2.

Structure of the utility WRREC − Index 8

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 I/O configuration ID code

3 ID1 code ID2 code

7.2.3.6 Read configuration data (Get_Permanent_Configuration)

Meaning

With this call, the following configuration data (configured planned data: PCD) of an

addressed AS-i slave are read:

● I/O configuration

● ID code

● ID1 code

● ID2 code

This data is read from the EEPROM of the AS-i master.

The configuration data are defined by the manufacturer of the AS-i slave. The meaning of

the configuration data is described in the AS-i master specification "AS-Interface Complete

Specification".

Structure of the utility RDREC − Index 9

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 I/O configuration ID code

3 ID1 code ID2 code

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

86 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.3.7 Read actual configuration data (Read_Actual_Configuration)

Meaning

The following configuration data (CDI) of an addressed AS-i slave determined by the

AS-i master on the AS-Interface is read with this call:

● I/O configuration

● ID code

● ID1 code

● ID2 code

The configuration data are defined by the manufacturer of the AS-i slave. The meaning of

the configuration data is described in the AS-i master specification "AS-Interface Complete

Specification".

Structure of the utility RDREC − Index 11

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 I/O configuration ID code

3 ID1 code ID2 code

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 87

7.2.3.8 Read AS-i slave parameter string (Read_Parameter_String)

Meaning

For AS-i slaves with the profile 7.4, this call can be used to read a parameter string from the

AS-i slave with the specified AS–i slave address.

The AS-i master supplies up to 220 bytes of reply data. The AS-i master signals the actual

number of parameter bytes sent by the AS-i slave in Byte 2. The maximum number of

parameter bytes is 220.

If the AS-i slave sends a string longer than 220 bytes, the AS-i master aborts string transfer

and terminates the job with an error. The received data is not made available to the user

program.

While transmission of the string is running, there is no transfer of user data / analog data with

the addressed AS-i slave.

Structure of the utility RDREC − Index 27

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 Number of string bytes

3 String byte 1

4 String byte 2

... ...

221 String byte 219 (possibly irrelevant)

222 String byte 220 (possibly irrelevant)

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

88 Manual, 04/2013, A5E02655230010A/RS-AA/003

7.2.3.9 Write AS-i slave parameter string (Write_Parameter_String)

Meaning

For AS-i slaves with the profile 7.4, this call can be used to send a parameter string to the

AS-i master, which forwards it to the specified AS-i slave address.

A parameter string of up to 220 bytes is transferred with the call. The AS-i master calculates

the actual number of parameter bytes to be sent to the AS-i slave from byte 2. The maximum

number of parameter bytes is 220.

The other information in the string is not evaluated by the AS-i master and is forwarded

transparently to the AS-i slave. While transmission of the string is running, there is no

transfer of user data / analog data with the addressed AS-i slave.

Structure of the utility WRREC − Index 28

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 Number of string bytes

3 String byte 1

4 String byte 2

... ...

221 String byte 219 (possibly irrelevant)

222 String byte 220 (possibly irrelevant)

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

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7.2.3.10 Read AS-i slave diagnostics string (Read_Diagnostic_String)

Meaning

For AS-i slaves with the profile 7.4, this call can be used to read a diagnostic string from the

AS-i slave with the specified AS-i slave address. The AS-i master supplies up to 220 bytes of

reply data. The AS-i master signals the actual number of diagnostic bytes sent by the

AS-i slave in Byte 2 (number of diagnostic bytes).

If the AS-i slave sends a string longer than 220 bytes, the AS-i master aborts string transfer

and terminates the call with an error. The received data is not made available to the user

program.

While transmission of the string is running, there is no transfer of user data / analog data with

the addressed AS-i slave.

Structure of the utility RDREC − Index 29

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 Number of string bytes

3 String byte 1

4 String byte 2

... ...

221 String byte 219 (possibly irrelevant)

222 String byte 220 (possibly irrelevant)

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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7.2.3.11 Read AS-i slave ID string (Read_Identification_String)

Meaning

For AS-i slaves with the profile 7.4, this call can be used to read an identification string from

the AS-i slave with the specified AS-i slave address.

The AS-i master supplies up to 220 bytes of reply data. The AS-i master signals the actual

number of ID bytes sent by the AS-i slave in Byte 2 (number of ID bytes).

If the AS-i slave sends a string longer than 220 bytes, the AS-i master aborts string transfer

and terminates the call with an error. The received data is not made available to the user

program.

While transmission of the string is running, there is no transfer of user data / analog data with

the addressed AS-i slave.

Note

For this call, bytes which contain the bits "Follows" and "Valid" are also transferred (see

AS-i slave profile of the Combined Transaction Types).

Structure of the utility RDREC − Index 30

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 Number of string bytes

3 String byte 1

4 String byte 2

... ...

221 String byte 219 (possibly irrelevant)

222 String byte 220 (possibly irrelevant)

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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7.2.3.12 Write CTT2 request (Write_CTT2_String)

Meaning

This call is used to send a CTT2 request according to the AS-i slave profile

"CombinedTransationType2" to the AS-i master with a byte string. The master forwards the

string bytes to the AS-i slave address specified in the send buffer.

A string with up to 220 bytes is transferred to the AS-i master with this call. The AS-i master

calculates the actual number of string bytes to be sent to the AS-i slave from byte 2 of the

send buffer (number of string bytes). The number of string bytes is specified by the user

program.

The addressed AS-i slave responds to the CTT2 request with a CTT2 response. This

response can be fetched using the call "Read CTT2 request".

The structure of the CTT2 request or CTT2 response (code, index, etc.) begins with string

byte 1. You will find further information about this in the respective AS-i slave description.

While the string transfers are executed on AS-i, cyclic user data/analog data transfer does

not take place with the addressed AS-i slave (this does not apply to digital I/O bits).

The type of protocol used means that transfer of up to 200 bytes can take up to half a

minute.

Structure of the utility WRREC − Index 31

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 Number of string bytes

3 String byte 1

4 String byte 2

... ...

221 String byte 219 (possibly irrelevant)

222 String byte 220 (possibly irrelevant)

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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7.2.3.13 Read CTT2 request (Read_CTT2_String)

Meaning

This call is used to read an acyclic CTT2 request from an AS-i slave according to the

AS-i slave profile "CombinedTransationType2".

The request that was written with the call "Write CTT2 request" (Index 31) is answered by

the slave. This response can be read using the call "Read CTT2 request (Index 31)". The

AS-i master transfers up to 223 bytes in the response, of which up to 220 are string bytes.

The actual number of string bytes contains Byte 2.

Only the most recent CTT2 response is read back in each case. If several

"Write_CTT2−String" calls are issued in succession, previous responses will be lost.

The structure of the CTT2 request or CTT2 response (code, index, etc.) begins with string

byte 1. You will find further information about this in the respective AS-i slave description.

While transmission of the string is executed on AS-i, there is no transfer of cyclic analog data

with the addressed AS-i slave. The type of protocol used means that transfer of up

to 200 bytes can take up to half a minute.

Structure of the utility RDREC − Index 31

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 Number of string bytes

3 String byte 1

4 String byte 2

... ...

221 String byte 219 (possibly irrelevant)

222 String byte 220 (possibly irrelevant)

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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7.2.3.14 Read AS-i slave I/O (Read_I/O_Configuration)

Meaning

The I/O configuration of an AS-i slave can be read out directly over the AS-i cable with this

call. The call is intended for diagnostics purposes and is not required in normal master

mode.

Structure of the utility RDREC − Index 33

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 0x0 I/O configuration

3 Reserved 0x00

7.2.3.15 Read AS-i slave ID (Read_ID−Code)

Meaning

The ID code of an AS-i slave can be read out directly over the AS-i cable with this call. The

call is intended for diagnostics purposes and is not required in normal master mode.

Structure of the utility RDREC − Index 34

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 0x0 ID code

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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7.2.3.16 Read AS-i slave extended ID1 (Read_Extended_ID−Code_1)

Meaning

The extended ID1 code of an AS-i slave can be read out directly over the AS-i cable with this

call. The call is intended for diagnostics purposes and is not required in normal master

mode.

Structure of the utility RDREC − Index 24

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 0x0 ID1 code

3 Reserved 0x00

7.2.3.17 Read AS−i slave extended ID2 (Read_Extended_ID−Code_2)

Meaning

The extended ID2 code of an AS-i slave can be read out directly over the AS-i cable with this

call. The call is intended for diagnostics purposes and is not required in normal master

mode.

Structure of the utility RDREC − Index 35

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

2 0x0 ID2 code

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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7.2.3.18 Read AS-i slave status (Read_Status)

Meaning

The status register of the addressed AS-i slave can be read out with this call. The flags of

the status register have the following meaning depending on the type of the AS-i slave:

Status bit AS-i slave according to standard 2.0 AS-i slave according to standard 2.1, V3

Address volatile Address/ID code volatile S0

This flag is set if

• the AS-i slave-internal routine for permanent storage of the AS-i slave address is

running. This can last up to 15 ms and must not be interrupted by another

addressing call.

• the AS-i slave-internal address comparison determines that the permanently

saved address is not identical to the entry in the address register.

S1 Parity error detected

This flag is set if the AS-i slave has

detected a parity error in a receive

message frame since the last "Read and

delete status" call.

I/O error detected

An AS-i slave can set this flag if it detects

a fault (e.g. wire break) on the connected

I/O.

S2 End bit error detected

This flag is set if the AS-i slave has

detected an end bit error in a message

frame since the last "Read and delete

status" call.

Reserved

S3 Read error in non-volatile memory

This bit is set if the AS-i slave has discovered a read error when reading the non-

volatile memory.

Structure of the utility RDREC − Index 80

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

AS-i slave status 2 0x0

S3 S2 S1 S0

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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7.2.3.19 Read parameter echo (Get_Write_Parameter_Echo)

Meaning

With the call "Get_Write_Parameter_Echo", the echo values for an AS-i slave are output as a

response to a "Write_Parameter" call (section "Write parameter value (Write_Parameter)

(Page 83)").

The echo value of an AS-i slave originates in the last parameter call sent to this AS-i slave. If

several "Get_Write_Parameter_Echo" calls are issued, previous echo values are lost.

Structure of the utility RDREC − Index 81

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

Parameters 2 0x0

S3 S2 S1 S0

3 Reserved 0x00

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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7.2.3.20 Write AS-i slave analog output data (Write_Analog_Output_Data)

Meaning

This call writes the analog output data of an AS-i slave.

Note

Write access to analog data

Write accessing of the analog data of an AS-i slave cannot be performed when the slave

was configured using STEP 7.

Structure of the utility WRREC − Index 82

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

Channel 1 of the analog slave

Channel 2 of the analog slave

Channel 3 of the analog slave

Channel 4 of the analog slave

Reserved 0x0000

Using the data record interface

7.2 Description of the AS-i line calls and AS-i slave calls

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7.2.3.21 Read AS-i slave analog input data (Read_Analog_Input_Data)

Meaning

This call reads the analog input data of an AS-i slave.

Structure of the utility RDREC − Index 83

Meaning

Byte

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 Version_hi = 0x00

1 Version_lo = 0x00

Channel 1 of the analog slave

Channel 2 of the analog slave

Channel 3 of the analog slave

Channel 4 of the analog slave

Reserved 0x0000

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Diagnostics 8

8.1 Overview

Diagnostics options

The following diagnostics options are available for the AS-i master CM 1243-2:

● LEDs on the module

● Diagnostics in STEP 7 (online presentation of the network and device view, diagnostics

buffer)

● Alarm messages in user program

● Creation of user-specific web pages via the web server of the S7-1200

You will find further information on the LED displays in sections "LEDs of the AS-i master CM

1243-2 (Page 18)" and "LEDs of the AS-i data decoupling unit DCM 1271 (Page 24)".

The diagnostic possibilities in STEP 7 and in the user program are described in the following

sections.

8.2 Diagnostics in STEP 7

Diagnostics in STEP 7

For diagnosing the AS-i master and the AS-i slave, STEP 7 must be switched to "Online"

status first. Use the STEP 7 function "Connect online" for this purpose.

If you have configured AS-i slaves in STEP 7, the diagnostic information about slaves can

also be displayed in STEP 7.

After the connection has been established, the status information of the AS-i slaves will be

displayed in the network view. The information of the AS-i master is displayed symbolically in

the device view. The status of these devices will also be displayed to the right of the device

in the project navigation by means of a symbol. For an explanation of the different status

symbols, please refer to the relevant tool tip.

Diagnostics

8.2 Diagnostics in STEP 7

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STEP 7 offers several possibilities for requesting the diagnostic information of the

AS-i master:

● In the network view of the device configuration, special diagnostic symbols indicate the

status of the AS-i master and the AS-i slave. Red symbols indicate an error, green

symbols indicate the "good" status for the devices.

● The same information is also indicated in the STEP 7 project tree. This provides a quick

overview of system status, because error information is transferred to the higher-level

components in accordance with the hierarchy. "Error in subordinate component" will

therefore be indicated by the status symbol for the S7-1200 CPU when one or more AS-

i slaves report an error.

● When an AS-i master is selected, you can open the "Online & Diagnostics" view. You can

start this from the menu "Online -> Online & Diagnostics". You can call up information

here concerning the status of the AS-i master.

● The control panel of the AS-i master can also be called up in this display. This shows the

status of the LEDs.

● All the relevant events are stored in the diagnostic buffer of the S7-1200 CPU. You can

display the diagnostic buffer in the "Online & Diagnostics" window for a selected S7-

1200 CPU.

Note

Diagnostics by means of the integrated LEDs

The AS-i data decoupling unit DCM 1271 is not configured in STEP 7, so no diagnostic

information can be called up there for this unit.

The AS-i data decoupling unit DCM 1271 can be diagnosed by means of the integrated

LEDs.

Signaling of a ground fault can also be transferred to a digital input of the S7-1200 via the

terminal described in section Displays and connections of the AS-i data decoupling unit

DCM 1271 (Page 23). The status can then be evaluated there in the user program.

Diagnostics

8.3 Alarms

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8.3 Alarms

Alarms

The AS-i master CM 1243-2 sends a diagnostic interrupt request to the CPU in the following

situations:

● The AS-i master CM 1243-2 has detected a problem - for example, failure of a slave

(incoming event).

● The problem was rectified or no longer exists (outgoing event).

If OB 82 does not exist, this error is written in the diagnostics buffer. The CPU will not take

any action and does not switch to STOP.

If an OB 82 exists, the operating system responds to an incoming event by calling the

OB 82. The S7 CPU then interrupts the cyclic user program and enters the event in the

system diagnostics buffer as a "Module fault" message.

Some diagnostic information is provided in the local data of the OB 82 for the user (e.g.

Which module triggered the interrupt? What type of error has occurred?).

Following execution of the OB 82, the S7 CPU continues the cyclic program from the point of

interruption.

The events are listed below that trigger a diagnostic interrupt in the AS-i master CM 1243-2:

● AS-i master signals a configuration error (CER) in protected mode

● AS-i master detects a problem with the AS-i supply voltage (APF)

● One or more slaves signal an I/O fault (PF) to the AS-i master

● An error occurred on parameterizing an AS-i slave using CTT2 protocol

Slave-specific diagnostic interrupts (e.g. configuration errors) are signaled using the

hardware ID (HW ID) of the respective slave. You can read the hardware ID for a selected

AS-i slave from the inspector window in STEP 7:

Figure 8-1 Inspector window in STEP 7

Diagnostics

8.3 Alarms

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If you have not configured any slaves in STEP 7, you will find the hardware IDs for the

slaves in the address overview of the inspector window:

Figure 8-2 Address overview of the inspector window

Line-specific diagnostic interrupts (e.g. AS-i POWER FAIL) are signaled using the hardware

ID (HW ID) of the AS-i interface. You will find this HW ID in the properties of the AS-i master:

Figure 8-3 Hardware ID in the properties of the AS-i master CM 1243-2

Diagnostics

8.3 Alarms

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8.3.1 Possible response to the diagnostic interrupt

Possible response to the diagnostic interrupt

Diagnostic events of the AS-i master and all AS-i slaves are signaled by means of OB 82

(e.g. no voltage on AS-Interface, I/O error).

Note

Diagnostic buffer

Please note that OB 82 is only called for the first error event. If an error from an AS-i slave is

already active, subsequent AS-i slave errors will only be indicated in the diagnostics buffer of

the CPU.

Diagnostic data records can be read out during program execution of the OB 82 block to

determine the cause of the interrupt.

See Section Diagnostic data records (Page 104) for an overview of these possibilities.

8.3.2 Interrupt response in different CM operating states

Interrupt response in different CM operating states

The AS-i master CM 1243-2 generates diagnostic interrupts that are triggered by external

alarm events, in protected mode only and not in configuration mode.

If the diagnostic interrupt cannot be activated (e.g. : when the S7-1200 is in STOP), the

event will only be indicated in the diagnostics buffer and via the LEDs of the

AS-i master CM 1243-2 and the S7-1200 CPU.

Diagnostics

8.4 Diagnostic data records

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8.4 Diagnostic data records

Further diagnostics information can be read out from the AS-i master CM 1243-2 using the

data record interface.

The table below provides an overview of the data records that can be used for this purpose:

Table 8- 1 Diagnostic data blocks

Name Index Information

Read lists and flags

(Get_LPS_LAS_LDS_LPF_Flags)

84 List of configured AS-i slaves

List of active AS-i slaves

List of detected AS-i slaves

List of existing I/O faults

AS-i master flags (e.g. APF)

Read AS-i slave status (Read_Status) 80 AS-i slave status register Also contains information about I/O faults

Read AS-i slave diagnostics string

(Read_Diagnostic_String)

29 Diagnostics string of an AS-i slave acc. to profile 7.4

Get_LAS_CDI_PI_Flags 85 Configuration data for the connected slaves

To access these data records, call the block "RDREC" in your program. Instructions for using

this block and the parameters required can be found in the section describing the data

record interface (section "Using the data record interface (Page 55)").

8.5 Diagnostics via the S7-1200 Web server

Diagnostics via the S7-1200 Web server

The Web server of the S7-1200 enables you to access data from Web pages regarding your

CPU and the connected components.

The Web server also enables user-defined Web pages to be integrated which display

contents of the CPU as well as the AS-i master CM 1243-2.

The diagnostic data of the AS-i master CM 1243-2 can also be read via the user program

interface (alarms, diagnostic data records) and integrated into the Web pages.

Any HTML authoring software can be used to create the Web pages – you can construct and

arrange the pages as you wish.

The connection between the Web page contents and the data of the user program is

established using "AWP commands" (Automation Web Pages) which you insert in your

HTML code.

A detailed description of these possibilities can be found in the system manual for S7-1200

in the section "Web server".

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Troubleshooting / fault displays 9

9.1 Replacing a defective AS-i slave / automatic address programming

Easy replacement of AS-i slaves

The "Automatic address programming" function makes it particularly easy for you to replace

defective AS-i slaves.

Note

It is important to note that "Automatic address programming" is only possible when the

AS-i master CM 1243-2 is in protected mode and only one AS-i slave of a particular type has

failed.

It is explained below how you can replace failed AS-i slaves easily using the "Automatic

address programming" function.

Recognizing a defective AS-i slave

In the case of a slave failure, the CER LED on the AS-i master CM 1243-2 is lit.

The front display of each AS-i slave has an LED, which signals the failure of the slave.

Replacing a defective AS-i slave

Replace the defective AS-i slave with an identical AS-i slave with address zero (setting in

delivery state).

For this slave, the AS-i master CM 1243-2 then programs the address of the original node

which has been replaced.

If no further faults are active, the AS-i LED returns to the color green.

Troubleshooting / fault displays

9.2 Fault indications/fault remedies

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9.2 Fault indications/fault remedies

Fault indications/remedies for faults on the AS-i master CM 1243-2

Below is a list of possible fault indications and potential remedial measures when operating

the AS-i master CM 1243-2.

Fault Possible cause Remedy

The current consumption of the

AS-i slaves is too high. Result: Voltage

on the AS-i cable is too low.

Check the current consumption of the

AS-i slaves. Supply the AS-i slaves

with external auxiliary voltage, if

applicable.

No voltage on the AS-i cable or voltage

too low.

Check the connection with the AS-i

power supply unit.

AS-i LED flashes red

Short-circuit on the AS-i cable Check the AS-i cable and the

connected AS-i slaves.

DIAG LED not lit There is no supply over the

communications bus.

Check whether the module is inserted

correctly.

DIAG LED flashes green, but does not

switch to constant green light

The AS-i master CM 1243-2 is not

configured.

Configure the AS-i master CM 1243-2

in STEP 7.

DIAG LED flashes red Possible causes:

• AS-i supply voltage missing

• Configuration fault (i.e. incorrect or

missing slave)

• Parameterization error

• Peripheral fault

• If the AS-i LED is lit in red at the

same time: Check the AS-i supply

voltage

• Check the slave configuration

(check connected slaves or change

slave configuration - see Section

Configuring AS-i slaves (Page 40)

and/or Addressing an AS-i slave

(Page 46)).

• If the PF LED is lit at the same time:

Check the connected I/O.

A configured AS-i slave has failed

(evaluate slave indications).

Replace the defective AS-i slave or

configure the AS-i master CM 1243-2

again if the AS-i slave is not required.

An non-configured AS-i slave was

connected to the AS-i line.

Remove the AS-i slave or configure the

AS-i master CM 1243-2 again.

CER LED is constantly lit.

An AS-i slave has been connected

whose configuration data (I/O

configuration, ID codes) does not

match the values of the configured

AS-i slaves.

Check whether an incorrect AS-i slave

has been connected. Configure the AS-

i master CM 1243-2 again if necessary.

Loose connection Check the connections of the

AS-i slaves.

CER display flickers, i.e. a configured

AS-i slave fails sporadically.

Injection of interference on the AS-

i cable.

Check that the grounding of the AS-

i master CM 1243-2 and routing of the

AS-i cable are correct. Check whether

the shield of the AS-i power supply unit

is connected correctly.

Troubleshooting / fault displays

9.2 Fault indications/fault remedies

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Fault Possible cause Remedy

The AS-i master CM 1243-2 does not

switch from configuration mode to

protected mode.

An AS-i slave with address 0 is

connected to the AS-i cable.

The AS-i master CM 1243-2 cannot

switch to protected mode when this

slave is connected.

Remove the AS-i slave with the

address 0.

In STEP 7 it is not possible to switch

between configuration mode and

protected mode

The automation system is in "RUN"

mode.

Switch the automation system to

"STOP".

The AS-i master CM 1243-2 does not

switch from protected mode to

configuration mode.

The automation system is in "RUN"

mode.

Switch the automation system to

"STOP".

The configuration data (I/O

configuration, ID code) of the replaced

AS-i slave does not match the values of

the original slave.

Check that the correct replacement

slave was used.

Compare the manufacturer's

information with regard to configuration

data.

If the original slave should be replaced

by a different type, assign the address

with the address programmer and

configure the AS-i master CM 1243-2

again.

Replaced AS-i slave does not have the

address 0.

Set the address of the replaced slave

using the address programmer.

Replaced AS-i slave is not correctly

connected or is defective.

Check the connections of the slave;

replace the slave if necessary.

Automatic address programming does

not take place.

The AS-i master CM 1243-2 is in

configuration mode.

Program the address of the new

AS-i slave with the address

programming device or via the

command interface of the AS-i master

CM 1243-2.

LED "CER" and the LEDs of active

AS-i slaves flicker sporadically.

An extender in AS-Interface has been

installed with the connections to "Line1"

and "Line2" interchanged.

Correct the connections on the

extender.

PF LED is lit One or more AS-i slaves signal a fault

in the connected I/O.

Check the I/O components connected

to the AS-i slaves and the cabling for

wire break or short-circuit.

Reference

You will find further information about the LEDs on the AS-i master CM 1243-2 in section

"LEDs of the AS-i master CM 1243-2 (Page 18)".

Troubleshooting / fault displays

9.2 Fault indications/fault remedies

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Fault indications/fault remedies for the data decoupling unit DCM 1271

Below is a list of possible fault indications and potential remedial measures when operating

the AS-i data decoupling unit DCM 1271.

Fault Possible cause Remedy

DIAG LED is off The supply voltage is not present or its

polarity is reversed.

Check that the supply voltage is

connected correctly on the top of the

AS-i data decoupling unit DCM 1271

ASI OL LED flashes Overloading of the AS-i cable has

occurred, or the AS-i cable is short-

circuited.

Check the current consumption of the

AS-i cable.

Rectify the short-circuit, if applicable - if

there is no short-circuit and the current

consumption is greater than 4 A, you

must reduce the number of slaves.

EFD LED flashing A ground fault has been detected for

ASI+ or ASI-.

Check which of the two cores of the

AS-i cable is connected to ground and

rectify the ground fault.

Reference

For additional information on the LEDs on the data decoupling unit DCM 1271, see section

"Displays and connections of the AS-i data decoupling unit DCM 1271 (Page 23)".

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Technical data 10

Technical data for the AS-i master CM 1243-2

3RK7243-2AA30-0XB0

Protection class IP IP20

Insulation voltage rated value V 500

Ambient temperature if installed on vertical mounting rail

• during operation °C 0 … 45

Ambient temperature if installed on horizontal mounting rail

• during operation °C 0 … 55

Ambient temperature

• during storage °C -40 … +70

Ambient temperature

• during transport °C -40 … +70

Relative humidity at 25 °C during operating maximum % 95

Installation altitude at a height over sea level maximum m 2 000

Explosion protection category for gas none

Explosion protection category for dust none

Explosion protection labeling for intrinsic safety of related operating

resources

• EEX ia No

• EEX ib No

Number of AS-i slaves per AS-Interface maximum

Number of inputs for AS Interface maximum 496

Number of outputs for AS Interface maximum 496

Number of units per CPU maximum 1

Product component optical interface No

Number of interfaces

• as AS-interface 1

• according to Industrial Ethernet 0

• according to PROFINET 0

• according to RS 485 0

• according to USB 0

• according to wireless 0

• others 1

Technical data

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3RK7243-2AA30-0XB0

Transfer rate of the AS-interface maximum bit/s 167 000

Module format S7-1200 design

Width mm 30

Height mm 100

Depth mm 75

Type of mounting snap-on fastening on 35 mm

standard rail

Type of data transmission S7-1200 backplane bus

Type of projection of the AS-interface With STEP 7, command interface

Type of voltage supply via backplane bus

Protocol is supported

• ASIsafe(Safety at work) protocol No

• PROFIBUS protocol No

• PROFINET CBA protocol No

• PROFINET IO protocol No

• PROFIsafe protocol No

• SNMP No

• other bus systems No

• TCP/IP No

Standard for wireless communication IEEE 802.11 No

Bus cycle time of the AS-interface

• at 31 slaves s 0.005

• at 62 slaves s 0.01

Consumed current from profile conductors of the AS-interface with

external 24 V-supply voltage maximum

A 0.1

Current consumed from backplane bus maximum A 0.25

Operating condition separate power supply 24 V No

Resistive loss W 2.9

AS-interface masterprofile is supported M4 (in acc. with AS-interface

specification V 3.0)

Version of the AS-interface specification V 3.0

Design of the electrical connection of the AS-Interface Screw-type connection

Type of display as status display by LED AS-i, PF, CM, CER, DIAG

Acceptability for application safety-related function No

Product feature redundancy capability No

Technical data

10.1 AS-i cycle time

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3RK7243-2AA30-0XB0

Product function

• diagnosis via E-mail No

• adapted for AS-i Power24V comment All product versions

• adapted for AS-i Power24V Yes

• galvanic isolation Yes

• web-based management No

Access to analog I/O data via process diagram/peripheral

addresses and data record transfer

Access to digital I/O data via process diagram/peripheral

addresses and data record transfer

10.1 AS-i cycle time

Dependency of AS-i cycle time on the number of connected slaves

The AS-i cycle time is calculated using the following formula:

tcycl = (1 + Number of activated AS-i slaves) x 154 μs

Note

If two AS-i slaves with an extended address area occupy the same address (e.g. address 5A

and address 5B), this slave pair will be calculated as one AS-i slave in the above formula.

This is due to the fact that slave pairs with the same address are only addressed in alternate

cycles. The cycle time in the above formula therefore doubles for such slaves.

Technical data of the data decoupling unit DCM 1271

Bestell-Nr. 3RK7271-1AA30-0AA0

product designation AS-Interface data decoupling unit

Number of outputs for AS Interface maximum 1

Number of electrical connections for alarm contact 3

Type of the connectable conductor cross-section

• for AWG conductors for auxiliary contacts 3x (24 ... 16)

• for auxiliary contacts

– solid 3x (0.2 ... 3.3 mm²)

– finely stranded with conductor end processing 3x (0.2 ... 3.3 mm²)

Type of display as status display by LED

EFD, ASI OL, DIAG

Technical data

10.1 AS-i cycle time

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Bestell-Nr. 3RK7271-1AA30-0AA0

Design of the short-circuit protection electronic

Design of the electrical connection for auxiliary and control current

circuit

screw-type terminals

Operating current of the auxiliary contacts at DC-13 at 24 V A 0.05

Output voltage

• 1 for DC

– rated value

– maximum V 31.6

– minimum V 20.5

– rated value V 30

• 2 for DC rated value V 24

Output current for DC maximum A 4

Type of voltage of the input voltage DC

Input voltage

• 1 for DC

– rated value

– maximum V 32

– minimum V 21

– rated value V 30

• 2 for DC rated value V 24

Input current for DC maximum A 4.1

Adjustable response current of the current-dependent overload

release

• initial value A 4

• final value A 4

Active power supplied W

120

Characteristic feature of the output short-circuit protected Yes

Suitability for use safety-related circuits No

Technical data

10.1 AS-i cycle time

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

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Bestell-Nr. 3RK7271-1AA30-0AA0

Product function

• removable terminal for auxiliary and control circuit Yes

• AS-interface data decoupling Yes

• self-reset Yes

• short-circuit to earth recognition Yes

• adapted for AS-i Power24V Yes

• adapted for grounded AS-i networks Yes

• adapted for non-grounded AS-i networks Yes

• manual RESET No

• reset external No

• sequential connected time-delay No

• test function of signaling contacts No

Protocol is supported AS interface protocol Yes

Item designation

• according to DIN 40719 extendable after IEC 204-2 according to

IEC 750

• according to DIN EN 61346-2 A

Relative humidity at 25 °C during operating maximum % 95

Reset function No

Protection class IP IP20

mounting position vertical, horizontal

Type of mounting 35-mm DIN rail mounting or wall

mounting with plug-in flaps

Width mm 30

Height mm 100

Depth mm 75

Installation altitude at a height over sea level maximum m 2 000

Ambient temperature

• during operating °C 0 … 55

• during storage °C -40 … +70

Verification of suitability CE / cULus / FM / ATEX

Technical data

10.1 AS-i cycle time

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AS-Interface Protocol Implementation Conformance

Statements A

A.1 AS-Interface Protocol Implementation Conformance Statement

(PICS)

PICS for the AS-i master CM 1243-2

Vendor SIEMENS AG

Product name AS-i master CM 1243-2

Order number 3RK7 243-2AA30-0XB0

Firmware version V1.0

Master profile M4

Date 01.12.2011

List of available master functions

Character Meaning

X Function available

- Function not available

No. Function or call to the host interface (symbolic

representation)

M4 Remark / implementation of the function with

1 Image, Status = Read_IDI() X Through automation system access to the I/O

data of the AS-i master CM 1243-2

2 Status = Write_ODI(Image) X Through automation system access to the I/O

data of the AS-i master CM 1243-2

3 Status = Set_Permanent_Parameter (Addr, Param) X

4 Param, Status = Get_Permanent_Parameter (Addr) X

5 Status, Param = Write_Parameter (Addr, Param) X

6 Status, Param = Read_Parameter(Addr) X

7 Status = Store_Actual_Parameters() X

8 Status = Set_Permanent_Configuration (Addr, Config) X

9 Status, Config = Get_Permanent_Configuration (Addr) X

See section "Description of the AS-i line calls

and AS-i slave calls (Page 58)"

10 Status = Store_Actual_Configuration() X By pressing the button "ACTUAL -> PLANNED"

in the control panel of STEP 7.

AS-Interface Protocol Implementation Conformance Statements   
A.1 AS-Interface Protocol Implementation Conformance Statement (PICS) 
  AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
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No.  Function or call to the host interface (symbolic 
representation) 
M4  Remark / implementation of the function with 
11  Status, Config = Read_Actual_Configuration (Addr)  X 
12  Status = Set_LPS(List31)  X 
13  Status, List31 = Get_LPS()  X 
14  Status, List31 = Get_LAS()  X 
15  Status, List32 = Get_LDS()  X 
16.0  Status = Get_Flags()  X 
16.1  Status, Flag = Get_Flag_Config_OK()  X 
16.2  Status, Flag = Get_Flag_LDS.0()  X 
16.3  Status, Flag = Get_Flag_Auto_Address_Assign()  X 
16.4  Status, Flag = Get_Flag_Auto_Prog_Available()  X 
16.5  Status, Flag = Get_Flag_Configuration_Active()  X 
16.6  Status, Flag = Get_Flag_Normal_Operation_Active()  X 
See Section "Description of the AS-i line calls 
and AS-i slave calls (Page 58)". 
Access to data record 84. 
16.7  Status, Flag = Get_Flag_APF()  X  CP error bit, LED indication (see section 
"Description of the AS-i line calls and AS-i slave 
calls (Page 58)") 
Access to data record 84. 
16.8  Status, Flag = Get_Flag_Offline_Ready()  X 
16.9  Status, Flag = Get_Flag_Periphery_OK()  X 
See Section "Description of the AS-i line calls 
and AS-i slave calls (Page 58)". 
Access to data record 84. 
17  Status = Set_Operation_Mode(Mode)  X  By pressing the button "Configuration mode" or 
"Protected mode" in the control panel of 
STEP 7. 
18  Status = Set_Offline_Mode(Mode)  X  See section "Description of the AS-i line calls 
and AS-i slave calls (Page 58)" 
19  Status = Activate_Data_Exchange(Mode)  -  Optional command; not implemented 
20  Status = Change_Slave_Address (Addr1, Addr2)  X 
21.1  Status = Set_Auto_Address_Enable  X 
21.2  Status = Get_Auto_Address_Enable  X 
22.1  Status, Resp = Cmd_Reset_ASI_Slave (Addr, RESET)  - 
22.2  Status, Resp = Cmd_Read_IO_Configuration (Addr, 
CONF) 
X 
22.3  Status, Resp = Cmd_Read_Identification_Code(Addr, 
IDCOD) 
X 
22.4  Status, Resp = Cmd_Read_Status (Addr, STAT)  X 
See Section "Description of the AS-i line calls 
and AS-i slave calls (Page 58)". 
22.5  Status, Resp = Cmd_Read_Reset_Status (Addr, 
STATRES) 
-  Not relevant for AS-i master acc. to profile M4; 
not implemented 
22.6  Status, Resp = Cmd_Read_Ext_ID−Code_1(Addr, 
IDCOD1) 
X 
22.7  Status, Resp = Cmd_Read_Ext_ID−Code_2(Addr, 
IDCOD2) 
X 
See section "Description of the AS-i line calls 
and AS-i slave calls (Page 58)"  
Not implemented 
23  Status, S_List = Get_LPF()  X  See Section "Description of the AS-i line calls 
and AS-i slave calls (Page 58)".  
Access to data record 84. 

  AS-Interface Protocol Implementation Conformance Statements 
  A.1 AS-Interface Protocol Implementation Conformance Statement (PICS) 
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
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No.  Function or call to the host interface (symbolic 
representation) 
M4  Remark / implementation of the function with 
24  Status = 
Write_Extended_ID−Code_11(S_Ext_ID−Code_1) 
X  See Section "Description of the AS-i line calls 
and AS-i slave calls (Page 58)".  
Not implemented 
25  AImage, Status = Read_AIDI()  X 
26  Status = Write_AODI(AImage)  X 
See section Description of the AS-i line calls 
and AS-i slave calls (Page 58) . 
Through automation system access to the I/O 
data of the AS-i master CM 1243-2  
27  String, Status = Read_ParamStr(S_Addr)  X  See "Read_Parameter_String" in section 
Description of the AS-i line calls and AS-i slave 
calls (Page 58)  
28  Status = Write_ParamStr(S_Addr, String)  X  See section Write AS-i slave parameter string 
(Write_Parameter_String) (Page 88)   
29  String, Status = Read_DiagStr(S_Addr)  X  See section Read AS-i slave diagnostics string 
(Read_Diagnostic_String) (Page 89)   
30  String, Status = Read_IdentStr(S_Addr)  X  See section Read AS-i slave ID string 
(Read_Identification_String) (Page 90)   
B  Supported slave profiles 
1  Support of extended address mode  X   
2  Support of Combined transaction type 1 integrated 
(S−7.3 only) 
X   
3  Full support of Combined transaction type 1 integrated  X  Support for profiles 7.3  and  7.4 only. 
4  Support of Combined transaction type 2 integrated  X   
5  Support of Combined transaction type 3 integrated  X   
6  Support of Combined transaction type 4 integrated  X   
7  Support of Combined transaction type 5 integrated  X   
 

AS-Interface Protocol Implementation Conformance Statements

A.1 AS-Interface Protocol Implementation Conformance Statement (PICS)

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Dimension drawings B

B.1 Dimension drawing AS-i master CM 1243-2

100

Figure B-1 Dimension drawing of AS-i master CM 1243-2

Note

All dimensions in the drawings are in millimeters.

B.2 Dimension drawing for AS-i data decoupling unit DCM 1271

100

111

Figure B-2 Dimension drawing of the AS-i data decoupling unit DCM 1271

Note

All dimensions in the drawings are in millimeters.

Dimension drawings

B.2 Dimension drawing for AS-i data decoupling unit DCM 1271

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

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Approvals C

Overview of approvals and standards

The AS-i master CM 1243-2 and the AS-i data decoupling unit DCM 1271 have the following

approvals and meet the following standards:

● cULus LISTED IND. CONT. EQ.

● FM

● ATEX: DEKRA 11ATEX0225X

● CE declaration of conformity

– EU Directive 2004/108/EEC "Electromagnetic Compatibility" (EMC Directive)

– EU Directive 2002/95/EC (RoHS)

● C-TICK

● Use in industrial environments according to:

– EN 61000-6-4:2007

– EN 61000-6-2:2005

Approvals issued

Note

Issued approvals on the type plate of the device

The specified approvals apply only when the corresponding mark is printed on the product.

You can check which of the following approvals have been granted for your product by the

markings on the type plate.

Standards and test specifications

The product meets the following standards and test specifications. The test criteria for the

module are based on these standards and test specifications.

Approvals

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cULus approval

Underwriters Laboratories Inc. meets:

• Underwriters Laboratories, Inc.: UL 508 Listed (industrial control

devices)

• Canadian Standards Association: CSA C22.2 Number 142

(process control equipment)

Note

The SIMATIC S7-1200 product series corresponds to the CSA standard.

The cULus mark indicates that the S7-1200 has been tested and approved by Underwriters

Laboratories (UL) in accordance with the standards UL 508 and CSA 22.2 No. 142.

CE declaration of conformity

The product meets the requirements and safety objectives of the following EU

directives and it complies with the harmonized European standards (EN) for

programmable logic controllers which are published in the official

documentation of the European Union.

● EU directive 2006/95/EEC "Electrical Equipment Designed for Use within Certain Voltage

Limits" (Low Voltage Equipment Directive)

– EN 61131-2:2007 Programmable controllers - Equipment requirements and tests

● EU Directive 2004/108/EEC "Electromagnetic Compatibility" (EMC Directive)

– Emission

EN 61000-6-4:2007: Industrial area

– Immunity

EN 61000-6-2:2005: Industrial area

● EU directive 94/9/EC "Equipment and protective systems intended for use in potentially

explosive atmospheres" (ATEX Explosion Protection Directive)

– EN 60079-15:2005: Type of protection 'n':

The EC Declaration of Conformity is available for all responsible authorities at:

Siemens AG

Industry Automation

Industrial Communication SIMATIC NET

PO Box 2355

D90713 Nuremburg

Germany

You will find the CE Declaration of Conformity for this product on the Internet

(http://support.automation.siemens.com/WW/view/en/23126063/134200).

Approvals

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FM certification

Factory Mutual Research (FM):

certification standard class number 3600 and 3611

Approved for use in:

Class I, Division 2, Gas Group A, B, C, D, Temperature Class T4A

Class I, Zone 2, IIC, Temperature Class T4, Ta = 55 °C

ATEX approval

EN 60079-0:2009: Potentially explosive atmosphere - general requirements

EN 60079-15:2010: Electrical apparatus for explosive gas atmospheres;

Type of protection 'n'

II 3 G Ex nA IIC T4 Gc

Over and above this, the following conditions must be met for the safe deployment of the

product:

● Install the modules in a suitable enclosure with degree of protection of at least IP54 to

EN 60529 and take into account the environmental conditions for operation of the

devices.

● If the rated temperatures of 70 °C at the cable entry or 80 °C at the branching point of the

wires are exceeded, the permitted temperature range of the selected cable must be

suitable for the actual measured temperatures.

● Measures must be taken to prevent the rated voltage being exceeded by more than 40%

due to transient disturbances.

C-Tick approval

The product meets the requirements of the AS/NZS 2064 standards (Class A)

Approvals

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Maritime approvals

The S7-1200 products are regularly submitted to the relevant authorities for approvals

relating to specific markets and applications. If you require a list of the current approvals for

individual devices, consult your Siemens contact.

Classification authorities:

● ABS (American Bureau of Shipping)

● BV (Bureau Veritas)

● DNV (Det Norske Veritas)

● GL (Germanischer Lloyd)

● LRS (Lloyds Register of Shipping)

● Class NK (Nippon Kaiji Kyokai)

Industrial environments

The product was developed for use in industrial environments.

Application Requirements for emissions Requirements for immunity

Industry EN 61000-6-4:2007 EN 61000-6-2:2005

Approvals

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Electromagnetic compatibility (EMC)

The electromagnetic compatibility (EMC) of an electrical device is its capability of functioning

as intended in an electromagnetic environment without emitting electromagnetic interference

that could impair the operation of other electrical devices in the vicinity.

Electromagnetic compatibility - immunity

EN 61000-4-2

Electrostatic discharge

8 kV air discharge to all surfaces

4 contact discharge to exposed conductive surfaces

EN 61000-4-3

Radiated electromagnetic field

80 to 1 000 MHz, 10 V/m, 80% AM at 1 kHz

1.4 to 2.0 GHz, 3 V/m, 80% AM at 1 kHz

2.0 to 2.7 GHz, 1 V/m, 80% AM at 1 kHz

EN 61000-4-4

Fast transient bursts

2 kV, 5 kHz with coupling network to AC and DC system power

1 kV, 5 kHz with coupling clamp to inputs/outputs

EN 61000-4-5

Surge immunity

DC systems - 2 kV common mode, 1 kV push-pull

For DC systems (I/O signals, DC power supplies), external protection is

necessary.

2 kV via coupling clamp on PROFIBUS cable

EN 61000-4-6

Conducted disturbances

150 kHz to 80 MHz, 10 V RMS, 80 % AM at 1 kHz

EN 61000-4-611

Voltage dips

DC systems

0% for 1 cycle, 40% for 12 cycles and 70% for 30 cycles at 60 Hz

Electromagnetic compatibility - emission

Conducted interference

EN 55022, Class A

0.15 MHz to 0.5 MHz

0.5 MHz to 5 MHz

5 MHz to 30 MHz

< 79 dB (μV) quasi peak; <66 dB (μV) mean value

< 73 dB (μV) quasi peak; <60 dB (μV) mean value

Conducted emissions

EN 55022, class A

30 MHz to 230 MHz

230 MHz to 1 GHz

< 40 dB (μV/m) quasi peak; measured at 10 m

< 47 dB (μV/m) quasi peak; measured at a distance of 10 m

Approvals

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Environmental conditions

Environmental conditions - transportation and storage

EN 60068-2-2, Test Bb, dry heat and

EN 60068-2-1 Test Ab, cold

-40 °C to +70 °C

EN 60068-2-30, Test Db, damp heat 25 °C to 55 °C, 95% humidity

EN 60068-2-14, Test Na, temperature shock -40 °C to +70 °C, dwell time 3 hours, 2 cycles

EN 60068-2-32 Free fall 0.3 m, five times, in product packaging

Atmospheric pressure 1 080 to 660 hPa (corresponding to an altitude of -1 000 to 3 500 m)

Environmental conditions - operation

Ambient temperatures / air humidity

(inlet air 25 mm below device)

0 °C to 55 °C horizontal mounting

0 °C to 45 °C vertical mounting

95% relative humidity, non-condensing

Atmospheric pressure 1080 to 795 hPa (corresponding to an altitude of -1000 to 2000 m)

Concentration of pollutants S02: < 10 ppm (over 10 days)

H2S: < 1 ppm (over 10 days)

EN 60068-2-14, Test Nb, temperature change 5 °C to 55 °C, 3 °C/minute

EN 60068-2-27 Mechanical shock 15 g, 11 ms pulse, 3 positive and 3 negative shocks in each of the

3 axes (half sine)

EN 60068-2-6 Sinusoidal vibration (DIN rail mount) 2 mm PP from 2 to 13 Hz and 0.7 g from 13 to 100 Hz (according to

shipbuilding 1);

10 sweeps per axis, 1 octave/minute

Protection class

● Protection class III according to EN 61131-2 (protective conductor not required)

Degree of protection

● Mechanical protection to EN 60529: IP20

Protects against finger contact with high voltage as tested by standard probe. External

protection required for dust, dirt, water and foreign objects of < 12.5 mm in diameter.

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List of references D

The following further reading is recommended:

● AS-Interface. Das Aktuator-Sensor-Interface für die Automation

ISBN 978−3446210646

AS-Interface. The Actuator-Sensor-Interface for Automation

ISBN 978−3446210653

Werner Kriesel, O.W. Madelung, Carl Hanser Verlag Munich, Vienna 1999

● AS-Interface Complete Specification

Available from the AS-International Association

The address is:

AS-International Association

Zum Taubengarten 52

D−63571 Gelnhausen

Germany

Tel.: +49 − 6051 − 473212

Fax: +49 − 6051 − 473282

E-mail (mailto:info@as-interface.net)

(AS-i technology is promoted by the AS-International Association).

Internet address of the AS-International Association:

http:/www.as-interface.net

● SIMATIC NET Industrial Communication for Automation and Drives

Catalog IK PI, Catalog IC 10, Catalog ST 70

The catalog can be obtained from any Siemens branch office or national

company.

● SIMATIC

S7-1200 System Manual

(http://support.automation.siemens.com/WW/view/de/36932465/0/en) (order

number: 6ES7298-8FA30-8BH0)

List of references

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Order numbers

The order numbers for the Siemens documents listed above are listed in the catalogs

"Industrial Communication and Field Devices, Catalog IK PI" and "SIMATIC Programmable

Controllers SIMATIC S7 / M7 / C7 − Components for Totally Integrated Automation, Catalog

ST70".

These catalogs as well as additional information can be requested from the local Siemens

branch offices and national companies.

You will find many of the Siemens AG manuals on the Siemens Customer Support Internet

site for automation:

http://support.automation.siemens.com

Enter the ID of the manual here as a search term. The ID is quoted in the reference in

brackets.

Manuals that are included in the online documentation of the STEP 7 installation on your

PG/PC can be found via the start menu (Start > SIMATIC > Documentation).

You will find an overview of the SIMATIC documentation on the Internet

(http://www.automation.siemens.com/mcms/topics/en/simatic/Pages/Default.aspx)

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Notes on CE marking E

Product designation:

AS-i master CM 1243-2 Order No.: 3RK7243-2AA30-0XB0

AS-i data decoupling unit DCM 1271 Order No.: 3KR7271-1AA30-0AA0

EU EMC Directive 2004/108/EU

The above product fulfills the requirements of the EU EMC Directive 2004/108/EU

"Electromagnetic compatibility"

The EU declaration of conformity is kept available for the competent authorities in

accordance with the above-named EU directives at:

Siemens AG / I IA CE CP

Werner-von-Siemens-Straße 48

92220 Amberg, Germany

Field of application

The product meets the following requirements:

Requirements for

Field of application

Emitted interference Interference immunity

Industry EN 61000-6-4 : 2007 EN 61000-6-2 : 2005

If the product is used in the domestic environment, interference with other devices may

occur.

Notes for machine manufacturers

This product is not a machine in the sense of the EU Machinery Directive. There is therefore

no declaration of conformity relating to the EU Machinery Directive 98/37/EU for this product.

If the product is part of the equipment of a machine, the manufacturer of the machine must

included it in the procedure for obtaining the declaration of conformity.

Notes on CE marking

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

130 Manual, 04/2013, A5E02655230010A/RS-AA/003

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 131

Glossary

APF

AS-i Power Fail. Flag or LED display that indicates that the supply voltage on the AS-i cable

is too low or has failed (e.g. failure of the AS-i power supply unit).

AS-i (AS-Interface)

Actuator-sensor interface. A networking system for the lowest field level of the automation

level. It is suitable for networking sensors and actuators with the controllers (previous

designation: SINEC S1).

AS-i A/B slave

AS-i A/B slaves use the extended address range. Two A/B slaves each (in pairs) can be

assigned to one address on AS-Interface; due to the address organization, up to 62 AS-i A/B

slaves can thus be connected to AS-Interface.

AS-i analog slave

AS-i analog slaves are special AS-i standard slaves that exchange analog values with the

AS-i master.

AS-i master

Via the AS-i master, the simplest binary sensors and actuators can be monitored and

controlled via AS-i modules or AS-i slaves.

A distinction is made between the standard AS-i master and the extended AS-i master.

AS-i module

A module concept is defined for AS-Interface that supports the modular interlinking of

AS-i slaves (e.g. sensors and actuators) via "AS-i modules".

These modules are of two types

The active AS-i module with integrated AS-i chip: This can be used to connect up to four

conventional sensors and four conventional actuators.

The passive AS-i module: This acts as a distributor and permits connection of up to four

sensors and actuators with integrated AS-i chip.

In accordance with the concept of the standard AS-i master and the extended AS-i master,

the AS-i slaves use either AS-i chips with standard functionality or extended functionality.

Glossary

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

132 Manual, 04/2013, A5E02655230010A/RS-AA/003

AS-i slave

All stations that can be addressed by an AS-i master are referred to as AS-i slaves. AS-i

slaves are distinguished according to their design (AS-i modules as well as sensors or

actuators with integrated AS-i connection) and their addressing mode (AS-i standard slave

and AS-i A/B slave with extended addressing mode).

AS-i standard slave

The AS-i standard slave occupies one address on AS-Interface; due to the address

organization, up to 31 AS-i standard slaves can therefore be connected to AS-Interface.

CER

Configuration Error (display of configuration errors)

Communication Module

Module for communication tasks that is used in an automation system as an interface

expansion for the CPU.

Communications Processor

Module for extended communication tasks that provides the CPU with additional interface

types or communication possibilities.

CPU

Central Processing Unit

CTT

Combined Transaction Types

DIAG

Diagnosis

Extended AS-i master

An extended AS-i master supports 31 addresses that can be used for standard AS-i slaves

or AS-i slaves with extended addressing mode. This extends the number of AS-i slaves that

can be addressed to 62.

Glossary

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

Manual, 04/2013, A5E02655230010A/RS-AA/003 133

LAS

List of Activated Slaves

LDS

List of Detected Slaves

LED

A light-emitting diode that is used to display the signal status.

LPF

List of Peripheral Faults

LPS

List of Projected Slave

Peripheral fault

Protected mode

In protected mode, the AS-i master only exchanges data with the configured AS-i slaves.

"Configured" means that the slave addresses and configuration data stored in the AS-i

master agree with the values of existing AS-i slaves.

Standard AS-i master

Up to 31 standard AS-i slaves or slaves with extended addressing mode (A slaves only) can

be connected to one standard AS-i master.

Glossary

AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200

134 Manual, 04/2013, A5E02655230010A/RS-AA/003

 
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
Manual, 04/2013, A5E02655230010A/RS-AA/003  135 
Index 
  
A 
Analog value channel, 51 
APF, 67 
Approvals, 121 
ATEX approval, 123 
CE declaration of conformity, 122 
C-Tick approval, 123 
cULus approval, 122 
Electromagnetic compatibility, 121 
Electromagnetic compatibility (EMC), 125 
EMC interference, 125 
EMC interference immunity, 125 
FM certification, 123 
AUTO_ADDR_ASSIGN, 67 
AUTO_ADDR_AVAIL, 67 
AUTO_ADDR_ENABLE, 67 
C 
CONFIG_OK, 67 
Configuration Error, 19 
Configuration mode, 43 
Configuration Mode, 19 
Connection contacts 
Maximum current carrying capacity, 20 
D 
Data record interface, 55 
DATA_EXCHANGE_ACTIVE, 67 
Degree of protection, 126 
Device-specific errors, 57 
Diagnosis, 18 
Dimensions for installation, 32 
Display elements 
CM 1243-2, 17 
E 
Easy replacement of AS-i slaves, 105 
Enclosure covers, 17 
End bit error, 95 
Environment, industry, 124 
Environmental conditions 
Operation, 126 
Transport and storage, 126 
EPROM_OK, 67 
F 
FAQs, 6 
G 
Ground fault detection, 13 
I 
Inspector window, 51 
L 
LDS_0, 67 
LEDs 
AS-i data decoupling unit DCM 1271, 24 
AS-i masters CM 1243-2, 18 
M 
Mounting position, 33 
N 
NORMAL_OPERATION, 67 
O 
OFFLINE, 67 
OFFLINE_READY, 67 
Online function ACTUAL -> PLANNED, 40 
OPERATING MODE, 67 
Overload protection, 13 
P 
Parameters 
System assignment, 48 

Index 
  
  AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200 
136 Manual, 04/2013, A5E02655230010A/RS-AA/003 
Parity error, 95 
Peripheral fault, 95 
PERIPHERY_OK, 67 
Protected mode, 43 
Protection class, 126 
R 
Reading error, 95 
Recognizing a defective AS-i slave, 105 
Replacing a defective AS-i slave, 105 
Return value, 56 
S 
Safety instructions 
Connecting or disconnecting, 11 
For use in hazardous areas, 30 
Protection from transient overvoltage, 11 
Safety Extra Low Voltage, 29 
Screw-type terminal blocks 
AS-i data decoupling unit DCM 1271, 14 
AS-i master CM 1243-2, 12 
Switching operating mode 
Configuration mode, 44 
Protected mode, 44 
System function block 
SFB 52, 56 
SFB 53, 56 
  

Siemens AG

Industry Sector

Postfach 23 55

90713 FUERTH

GERMANY

Subject to change without prior notice

Order No.: 3ZX1012-0RK71-1AC1

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AS-Interface