SIMATIC S5
308-3UA12 Expansion Unit
Interface Module
Manual
EWA 4NEB 812 6051-02b
Edition 04
STEP ® and SIMATIC ® are registered trademarks of SIEMENS AG.
Copyright © Siemens AG 1988
Subject to change without prior notice.
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model or design are reserved.
Index
Spare Parts
1
2
3
4
5
6
7
System Overview
Hardware Installation
Start-Up
Error Diagnostics
Technical Specifications
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Introduction
EWA 4NEB 812 6051-02a
308-3 Interface Module Introduction
Introduction
The 308-3 interface module is used for connecting the following devices in
series:
• The EU 183U, EU185U, and EU 186 expansion units on the ER 701-2 or ER
701-3 module subracks. You can use digital and analog input/output
modules in these expansion units.
• The ET 100U electronic terminator for distributed I/O.
• The ICM 560 individual control modules.
The 308-3 interface module can be used in the S5-115U, S5-135U, S5-150U and
S5-155U central controllers. The interface module can also be used in the EU
185U and EU 186U expansion units if the expansion units are connected to a
higher-level central controller via the IM 304/314 interface module pair.
The following can be connected on the distributed side:
• The 318-3 interface module used in the EU 183U, EU 185U, and EU 186U
expansion units and in the ER 701-2 or ER 701-3 subracks.
• The 318-8 interface module used in the ET 100U electronic terminator for
distributed I/O.
• The ICM 560 individual control module.
The 308-3 interface module has an interface with two isolated terminals, each
of which is designed for a serial two-wire bus. A distance of up 3000 m/9850 ft.
can be covered via by each of these interface chains.
EWA 4NEB 812 6051-02a v
1 System Overview
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1.1 Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 1- 1
1.2 Design of the 308-3 Interface Module . . . . . . . . . . . . . 1 - 2
1.3 Device configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1- 4
EWA 4NEB 812 6051-02a
Figures
1-1 Block Diagram of the 308-3 Interface Module . . . . . . 1 - 2
1-2 Design of the 308-3 Interface Module . . . . . . . . . . . . . 1 - 3
1-3 Typical Module Configurations . . . . . . . . . . . . . . . . . . . 1 - 4
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EWA 4NEB 812 6051-02a
308-3 Interface Module System Overview
1 System Overview
The following subsections contain information on the principle of operation
and design of the 308-3 interface module, and also on possible device
configurations with the different nodes.
1.1 Principle of Operation
The 308-3 interface module controls the complete information exchange
between the peripheral nodes and the CPU in the central controller.
The module has a 2K-byte dual-port RAM with 1K bytes for inputs and 1K bytes
for outputs, which acts a transfer buffer for this purpose. This memory is
accessed by both the CPU in the central controller and the microcontroller on
the interface module. Data is exchanged between the CPU and the dual-port
RAM via the parallel S5 bus on the backplane of the subrack.
The microcontroller accepts output data from the buffer previously stored there
by the CPU and also transfers input data to the buffer to be scanned there later
by the CPU. In a similar manner, the microcontroller also controls data traffic via
the serial interface.
An EPROM submodule must be plugged into the module if you connect an
ET 100U electronic terminator for distributed I/O or ICM 560 individual control
modules. The addresses of the input/output modules used and the device
configuration are read out of this submodule.
The EPROM submodule is programmed using COM ET 100 communications soft-
ware.
No EPROM submodule is required for connecting a 318-3 interface module.
You can use the three coding switches on the module to set the diagnostics
address (switch 1), the start of the page area (switch 2), the baud rate, the chain
watchdog and the time-out mode (switch 3) of the serial interface ( 3.4).
EWA 4NEB 812 6051-02a 1-1
System Overview 308-3 Interface Module
Figure 1-1 Block Diagram of the 308-3 Interface Module
1.2 Design of the 308-3 Interface Module
The 308-3 interface module is a printed-circuit board which can be used both in
controllers with block-type modules (e.g. S5-115U) and also controllers with
compact modules (e.g. S5-135U). An adapter casing (Order No. 6ES5 491-0L .11)
is required for use in controllers with block-type modules.
There are two backplane connectors (X1, X2) on the module which mate with
the connectors of the parallel S5 bus on the backplane of the mounting rack.
Besides the mode selector for switching the module on and off, there is a
receptacle on the frontplate for an EPROM submodule (only required if an ET
100U or ICM 560 is connected), as well as a four-pin plug connector into which
the interface connector is plugged.
Also on the frontplate are a red FAULT LED and two green LEDs which show the
operating status of the module.
There are three coding switches on the PCB which can be used to make the
various settings ( 3.4)
1-2 EWA 4NEB 812 6051-02a
308-3 Interface Module System Overview
Figure 1-2 Design of the 308-3 Interface Module
1 Receptacle for
memory sub-
module
2 Mode selector
3 Red FAULT
LED
4 Green LEDs
(interface dis-
play)
5 Receptacle for
the serial
interfaces
(2 chains via
socket con-
nectors)
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Jumper inserted*
X1/X2 48-way backplane connector
X3/X9/X11 Jumpers for page addressing
X7 4-way plug connector for serial
interfaces
X8 Memory submodule
S1 ”Diagnostics address” switch
S2 ”Page number” switch
S3 Switch for ”Baud rate”, QVZ and
”Interface watchdog”
X 13 Jumper for PESP evaluation
X14 PIN 1/2 CPKLA/ X2. z18 jumper (if the
308-3 interface module is
plugged into a central
controller) *
X14 PIN 2/3 CPKLA/ X2. z14 jumper (if the
308-3 interface module is
plugged into an expansion unit)
* On delivery
EWA 4NEB 812 6051-02a 1-3
System Overview 308-3 Interface Module
1.3 Device Configuration
There is a wide range of device configurations possible thanks to the large
number of nodes which you can operate simultaneously on both interface
chains of the 308-3 interface module.
Figure 1-3 Typical Module Configurations
1-4 EWA 4NEB 812 6051-02a
2 Hardware Installation
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2.1 Slots for the 308-3 Interface Module . . . . . . . . . . . . . . 2 - 2
2.2 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 3
2.2.1 Assembly in Compact Controllers . . . . . . . . . . . . . . . . . . 2 - 3
2.2.2 Assembly in Central Controllers or Expansion Units
for Block-Type Modules . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 3
2.3 Transmission Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 4
2.3.1 Cable Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 4
2.3.2 Physical Characteristics of Cables . . . . . . . . . . . . . . . . . . 2 - 5
2.3.3 Connecting the Transmission Cable . . . . . . . . . . . . . . . . 2 - 8
2.3.4 Laying the Transmission Cable . . . . . . . . . . . . . . . . . . . . 2 - 9
2.3.5 Protection Against Lightning . . . . . . . . . . . . . . . . . . . . . 2 - 10
2.4 Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 11
2.5 Page addressing (Duplication of the Q Area). . . . . . . 2 - 12
EWA 4NEB 812 6051-02a
Figures
2-1 Possible Slots for the 308-3 Interface Module . . . . . . . 2 - 2
2-2 Connecting The Transmission Cable . . . . . . . . . . . . . . . 2 - 8
2-3 Protection Against Lightning . . . . . . . . . . . . . . . . . . . . . 2 - 10
2-4 Graphical Representation of Page Addressing . . . . . . 2 - 13
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Tables
2-1 Possible Cable Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 4
2-2 Laying the Transmission Cable . . . . . . . . . . . . . . . . . . . . 2 - 9
2-3 I/O Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 11
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EWA 4NEB 812 6051-02a
308-3 Interface Module Hardware Installation
2 Hardware Installation
The 308-3 interface module can be used only in certain slots of the various
central controllers and expansion units.
The following pages contain information on the various requirements to be
met when selecting and connecting the transmission cable.
EWA 4NEB 812 6051-02a 2-1
Hardware Installation 308-3 Interface Module
2.1 Slots for the 308-3 Interface Module
The 308-3 interface module can be plugged into the S5-115U, S5-135U, S5-150U
and S5-155U programmable contollers, as well as the EU 185U und EU 186U
expansion units. Figure 2-1 shows the slots which can be used.
Figure 2-1 Possible Slots for the 308-3 Interface Module
1) The CP and IM 308-3 cannot be operated simultaneously when plugged into these slots!
2) The 308-3 interface module can usually only be plugged into the EU 185U and EU 186U
expansion units if the expansion units and the central controller are interconnected via the
IM 304/314 pair.
3) If the IM 308-3 is to be operated with page mode in the expansion unit, jumper X13 must
be removed.
4) Only subracks CR 700-2, CR 700-3 and CR 700-0LB.. can be used with the S5-115U. In
addition, an adapter casing is required for adding the 308-3 interface module.
5) Two 308-3 interface modules in one adapter casing can be plugged into slot 6 of subrack
CR 700-3 or slot 3 of CR 700-0LB..
2-2 EWA 4NEB 812 6051-02a
308-3 Interface Module Hardware Installation
2.2 Assembly
The 308-3 interface module can be used both in compact controllers and
controllers with block-type modules. The following is a description of the
differences in assembly between these two types.
W a r n i n g :
The module must not be plugged in or unplugged under power.
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2.2.1 Assembly in Compact Controllers
Proceed as follows when plugging the module into a compact central controller
or expansion unit:
• Position the top and bottom edge of the module board in the top and
bottom guide rails of the selected slot.
• Slide the module slowly in until you feel resistance.
• Press the module into place at the top and bottom.
Pull the module out by gripping the handle and applying a gentle up and down
rocking motion.
2.2.2 Assembly in Central Controllers or Expansion Units for
Block-Type Modules
If you wish to use the module in central controllers or expansion units for block-
type modules, you require an adapter casing (Order No. 6ES5 491-0L .11).
To install the interface module in an adapter casing, push the module along the
guide rails into the casing. Lock the module into place with the excentric
locking collars at the top and bottom of the casing. If an opening remains on
the front after the module has been inserted, cover it with a blanking plate.
EWA 4NEB 812 6051-02a 2-3
Hardware Installation 308-3 Interface Module
2.3 Transmission Cable
To ensure error-free data transfer between the 308-3 interface module and all
connected nodes, please note the following points with regard to the
transmission cable. Data transmission is also possible via sliprings or light
barriers.
2.3.1 Cable Types
Use a shielded, twisted-pair cable for transmission. The type of cable selected
depends on the necessary cable length and the required baud rate. The
following is a list of possible cable types.
Table 2-1 Possible Cable Types
Type of cable
Baud rate over a distance of
500 m
1640ft 700 m
2296 ft 1000 m
3280 ft 3000 m
9840 ft
SIEMENS control cable,
type A1)
(6XV1 830-0AH10)
two-wire buried cable
(6XV1 830-3AH10)
375 kBaud 187.5 kBaud 187.5 kBaud ---
two-wire drum cable
(6XV1 830-3BH10) 375 kBaud 187.5 kBaud --- ----
SIEMENS control cable,
type B2)
(V45551-F21-B5) 187.5 kBaud 62.5 kBaud 62.5 kBaud 31.25 kBaud
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1) Supplied by the meter: specify length in ... m; minimum order quantity 20 m
2) Maximum length delivered 1000 m; greater lengths on request
2-4 EWA 4NEB 812 6051-02a
308-3 Interface Module Hardware Installation
2.3.2 Physical Characteristics of Cables
Please note the following criteria if you wish to use cable types other than those
listed in 2.3.1:
Cable Design
Shield
• Normal case: Twisted-pair cable within one shield.
Permissible baud rates and maximum cable lengths:
375,00 bps not permissible
187,50 bps max.300 m/1000 ft.
62,50 bps max.1000 m/3300 ft.
31,25 bps max.2000 m/6600 ft.
Longer cables are not permissible!
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Shield
• Special case: Several individually shielded conductor pairs
combined to form one cable. One conductor pair is
used for the serial interface between the 308-3
interface module and its nodes and other conductor
pairs for other data transfers.
Permissible baud rates and maximum cable lengths:
62,50 bps max.500 m/1650 ft.
31,25 bps max.1000 m/3300 ft.
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• Not permissible: Unshielded cable or non-twisted pairs, or several
conductors within one shield transmitting other
signals in addition to the signals between the 308-3
interface module and its nodes.
EWA 4NEB 812 6051-02a 2-5
Hardware Installation 308-3 Interface Module
paired
Shield
• Exception: One twisted pair or several twisted pairs where only
one pair where only one pair is used for the serial
interface between the 308-3 interface module and its
nodes and the other conductor pairs remain unused.
Permissible baud rates and maximum cable lengths:
62,50 bps max.250 m/825 ft.
31,25 bps max.500 m/1650 ft.
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• General: Shielding and twisting are prerequisites for error-free
data transmission.
Electrical Characteristics of the Cable
• The cable must be designated by the manufacturer as a transmission
cable.
• Two cores must be twisted to form a pair. Insulation must be of
polyethelyne. The wire cross-section must be between 0.5 mm2/20 AWG
and 1.5 mm2/15 AWG; braided copper-wire shielding; in some cases,
tinned PVC outer sheath.
• The total resistance of the loop (sum of the supply and return wire) must
not exceed 100 ohms.
• The resistance of the shielding must not exceed 20 ohms/km.
• The capacitance per unit length of the cable must not exceed 60 nF/km
(= 60 pF/m).
• The surge impedance must be between 90 and 130 ohms. (Measuring fre-
quency approximately 100 kHz to 1 MHz).
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If the cable capacitance and surge impedance are kept within the required
limits, the line attenuation will also remain within the permissible range.
2-6 EWA 4NEB 812 6051-02a
308-3 Interface Module Hardware Installation
Unfamiliar Cable
If you wish to use a cable which meets the cable design requirements but which
has electrical characteristics unkown to you, the following restrictions apply:
• Maximum cable length is limited to 500 m/1650 ft.
• Transmission must be tested at a rate of 375,000 baud and must be free of
noise. All noise-generating parts of the system must be in operation during
this test.
Then set the baud rates as follows:
- up to 250 m: max. 62,500 bps
- up to 500 m: 31,250 bps
Longer cables are not permissible!
If you comply with these requirements, fault-free operation should result,
but cannot be guaranteed.
EWA 4NEB 812 6051-02a 2-7
Hardware Installation 308-3 Interface Module
2.3.3 Connecting the Transmission Cable
Signal Line Connections
The 308-3 interface module is supplied with the interface connector for the
transmission cable. The screw-type connections are suitable for stranded
conductors with a cross-section of between 0.5 mm2 (20 AWG) and 1.5 mm2 (15
AWG). Core end sleeves are recommended.
A connection schematic is shown below ( Figure 2-2)
Figure 2-2 Connecting the Transmission Cable
Chain 1
Chain 2
1
2
3
4
S
S-N*
S
S-N*
* S-N = Negated signal
If you loop the transmission cable through from one node (318 interface
module or ICM 560) to the other, terminate the incoming and outgoing
transmission cables in parallel on the front connector. If you should mistakenly
cross the conductors of one or more interface modules, it will be impossible to
reference these modules. The 308-3 interface module will not detect an
interface error.
2-8 EWA 4NEB 812 6051-02a
308-3 Interface Module Hardware Installation
Terminating Resistor
Each interface chain must be terminated at the last node with a standard 120
ohm, 0.25 W carbon-layer resistor (supplied with the 308-3 interface module).
Slide the insulation sleeve (also supplied) over the resistor to prevent
unintentional contact with the connecting wires. Then simply clamp the resistor
between terminals 3 and 4 on the interface connector of the last node. Make
sure that good contact is made. If possible, press the resistance wires together
with the stranded transmission conductor into the same core end sleeves.
Connecting the Shielding
You must ground the transmission cable shield as close as possible to the
expansion unit using a ground clamp, or at the point where the cable enters the
cabinet with a shield bar. Continue the shielding right up to the interface
connector without grounding it again.
For further information, please refer to the Description ”Richtlinien zum
störsicheren Aufbau Speicherprogrammierbarer Steuerungen”, Order No.
6ES5 998-7AB11.
2.3.4 Laying the Transmission Cable
Please note the following when laying transmission cable.
Table 2-2 Laying the Transmission Cable
Baud rate up to Baud rate greater than
62,500 bps 62,500 bps
Parallel to signal
cables up to 60 V In the same cable duct In separate cable ducts
Parallel to power
cables from 380 V At distances greater
than 10 cm/4 in. or in
separate ducts or racks
At distances greater than
20 cm/4 in. or in separate
ducts or racks
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EWA 4NEB 812 6051-02a 2-9
Hardware Installation 308-3 Interface Module
2.3.5 Protection Against Lightning
If cables and lines for SIMATIC S5 devices are to be run outside buildings, you
must take measures to ensure internal and external lightning protection.
Outside buildings run your cables
either
- In metal conduits grounded at both ends
or
- In steel-reinforced concrete cable channels
Protect signal lines from overvoltage by using:
• Varistors
or
• Lightning arresters filled with inert gas
We recommend you to use the BLITZDUCTOR® ARE, 8 V, as a protective element
for the transmission cable to the ET 100U station ( Figure 2-3).
Install the protective elements at the point where the cable enters the building.
Transmission cable:
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BLITZDUCTOR® ARE
lightning arrester
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ET 100U station
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Building ground
Figure 2-3 Protection Against Lightning
2-10 EWA 4NEB 812 6051-02a
308-3 Interface Module Hardware Installation
2.4 Addressing
Data can be exchanged in the following input/output areas. You will learn later
how to set the desired input/output area on the module ( 3.4.5).
Table 2-3 I/O Areas
Area Initial address End address
P
Q
IM3
IM4
F000H
F100H
FC00H
FD00H
F0FFH
F1FFH
FCFFH
FDFFH
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Note:
I/O areas IM3 and IM4 are accessible only via the FB 196 standard function
block or the LIR and TIR operations.
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Each I/O area encompasses 256 bytes of input data and 256 bytes of output
data.
Exceptions:
• One byte per 308-3 interface module is required as a diagnostics address in
the P area.
• The diagnostics address in initial page area Qn is required for the purpose of
page addressing.
The address areas of all ET 100Us and ICM 560s are assigned using COM ET 100U
communications software and stored in an EPROM submodule. The EPROM
submodule is plugged into the 308-3 interface module after being pro-
grammed.
Neither an address list nor an EPROM submodule are required for addressing
the I/O area in expansion units with the 318-3 interface module.
EWA 4NEB 812 6051-02a 2-11
Hardware Installation 308-3 Interface Module
Note:
• Address 255 is reserved for page selection during page addressing and
cannot be used for input/output modules in the Q area.
• Make sure that the Q area cannot be directly referenced in the same
central controller (double addressing) in the case of page addressing.
• The diagnostics address set cannot be used for input/output modules.
• There must be no I/O module having the same address in the central
controller if the 308-3 interface module references address areas Q, IM3 or
IM4 (double addressing).
• The S5-115U recognizes the following address area:
- CPU 941 ... 944 address area P
- CPU 945 address areas P and Q.
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2.5 Page Addressing (Duplication of the Q Area)
Page addressing is based on the duplication of the Q area. For page addressing,
this area must be present in your programmable controller. This is the case in
the S5-135U, S5-150U and S5-155U.
In the S5-115U, CPU 941 ... 944 have only the P area.
You can convert any 308-3 interface module to page addressing by changing
jumpers X3, X9 and X11 on the module ( 3.4.5).
This allows you to process up to 4 x 255 bytes of input data and 4 x 255 bytes of
output data in the Q area of each 308-3 interface module.
Each 308-3 interface module in the central controller can also be converted to
another initial page area. A total of 64 initial page areas are available. Page
addressing thus frees 4 x 64 x 255 bytes for input data and 4 x 64 x 255 bytes for
output data.
Use linear addressing first.
Up to 1K bytes (4 x 256 bytes) of address area are available to you for linear
addressing, depending on your programmable controller. Duplication of the Q
area is only to be recommended if this address area is insufficient.
2-12 EWA 4NEB 812 6051-02a
308-3 Interface Module Hardware Installation
Figure 2-4 Graphical Representation of Page Addressing
Page areas *
I/Q areas **
254
0Q
252
16
12
8
4
0
Qn+3
Qn+2
Qn+1
Qn20
Initial page area Qn *
IM 4
IM 3
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P
*Must be set on the 308-3 interface module
** Must be set on the 318-3 interface module, or must be programmed for the ET 100U and
ICM 560 using COM ET 100 communications software
EWA 4NEB 812 6051-02a 2-13
3 Start-Up
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3.1 Start-Up of the Interface Module . . . . . . . . . . . . . . . . . 3 - 1
3.2 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 2
3.3 Data Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 2
3.4 Default Settings on the Module . . . . . . . . . . . . . . . . . . . 3 - 3
3.4.1 Chain Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 4
3.4.2 Baud rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 5
3.4.3 QVZ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 6
3.4.4 Diagnostics Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 8
3.4.5 Setting the Input/Output Areas or Page Address . . . . 3 - 9
3.4.6 Initial Page Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 12
3.5 Transmission Time of the Serial Transmission Link. . 3 - 14
EWA 4NEB 812 6051-02a
Figures
3-1 Monitoring of the Serial Interface Chain . . . . . . . . . . . 3 - 4
3-2 Setting the Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 5
3-3 Selecting the QVZ Mode . . . . . . . . . . . . . . . . . . . . . . . . . 3- 6
3-4 Typical Diagnostics Address Setting . . . . . . . . . . . . . . . 3 - 8
3-5 Selecting the Initial Page Area with Switch S2 . . . . . . 3 - 12
3-6 Typical Initial Page Area Setting . . . . . . . . . . . . . . . . . . . 3 - 13
3-7 Module Configuration for Calculation . . . . . . . . . . . . . 3 - 17
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Tables
3-1 Response to Errors when QVZ Mode Activated . . . . . 3 - 7
3-2 Response to Errors when QVZ Mode Off . . . . . . . . . . . 3 - 7
3-3 Transmission Time tET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 14
3-4 Transmission Time tEU . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 15
3-5 Transmission Time tICM . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 15
3-6 Data Capacity of Digital Modules . . . . . . . . . . . . . . . . . 3 - 17
3-7 Data Capacity of Analog Modules . . . . . . . . . . . . . . . . . 3 - 18
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EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
3 Start-Up
There are various points to be noted to ensure error-free start-up and operation
of your system.
3.1 Start-Up of the Interface Module
Mode Selector in ON Position
• The interface module starts the configuration run after power up or when
power is restored after a failure.
All units connected are initialized during configuration. The power supply
to these units must therefore be on.
• The configuration run lasts approximately 5 to 20 seconds, during which
time the red LED flashes with a frequency which depends on the baud rate
set.
• The 308-3 interface module will start up properly, even if the CPU is in the
STOP mode.
• If the red LED flashes for longer than 20 seconds, there is either a fault in
the module (RAM or ROM error) or the EPROM submodule has been
wrongly programmed (check with COM ET 100U)
Note:
The CPU switches must not be operated during the configuration run.
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Mode Selector in OFF Position
• When the mode selector on the frontplate is in the OFF position, the units
connected to the serial interface can no longer be referenced and assume
the wait status.
The CPU generates a BASP signal (command output disable).
• The CPU receives diagnostics byte 0. Bit F6 in this byte means "Distributed
I/O not ready".
• If QVZ (time-out) mode is active ( 3.4.3), a time-out will be recognized by
the CPU.
EWA 4NEB 812 6051-02a 3-1
Start-Up 308-3 Interface Module
3.2 Serial Interface
The serial interface is floating and is similar to the EIA (Electronic Industries
Association) RS 485 standard. Both interface chains are at the same potential
and operate in parallel. You must activate the relevant interface when the
transmission cable is connected and the terminating resistor is connected to the
end of the chain ( 3.4.1). The relevant green LED will then light up.
If one of the interface chains is not used, the relevant interface must be
switched off . The relevant green LED will then remain dark.
If you activate an unused interface, a time-out will result, irrespective of the
position of the time-out switch (QVZ).
3.3 Data Exchange
I/O data is exchanged in half-duplex mode on the master-slave principle
between the central controller and the expansion units, the ET 100U or the ICM
560 via a serial transmission link. Both interfaces together can take a maximum
of 64 nodes, of which only 62 may be ET 100Us or ICM 560s. A terminating
resistor (120 ohms, 0.25 W) is required at the end of each chain.
Using COM ET 100U communications software, you must program the number
of input and output bytes and their initial addresses for all ET 100Us and ICM
560s connected and store this information in the EPROM submodule.
As is usual with the input/output modules of the U range, the individual
addresses of the modules are set in the expansion units.
3-2 EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
Data Transmission Security
You can monitor the data transmitted by inserting one or two check bytes at
intervals of up to 18 data blocks with cyclical BCH code (Hamming code).
Noise immunity can be improved for slower data transmission rates by using a
filter.
Baud rate Number of
check bytes Filter
375,000 bps
187,500 bps
62,500 bps
31,250 bps
1
2
2
2
no
no
yes
yes
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After a fault has been detected, the message is repeated twice before an error
message appears.
Parasitic signals can cause a unit to switch off automatically (the ICM 560
switches to manual mode). However, the system prevents erroneous setting of
outputs. After a cold restart following a fault, the 308-3 interface module
executes a reconfiguration run.
Please note the following during configuration:
- If you expect severe interference, you should use one of the two lowest
baud rates.
- If you have to select a high baud rate for reasons of speed, please pay
careful attention to the guidelines for connecting and laying transmission
cables.
3.4 Default Settings on the Module
Before putting the module into service, you must use the three coding switches
to set the diagnostics address (switch S1), the initial page area (switch S2) and
the baud rate, chain monitoring facility and QVZ mode of the serial interface
(switch 3).
Use a ballpoint pen or similar pointed object, but not a pencil, to set the switch
blocks.
In the following setting examples, a pressed switch is represented by: •.
Switch S3.4 is not assigned.
EWA 4NEB 812 6051-02a 3-3
Start-Up 308-3 Interface Module
3.4.1 Chain Watchdog
The chain watchdog of both serial interfaces is set using switches S3.5 or S3.6.
When activated (S3.5 or S3.6 at OFF), the interface chain watchdog checks
whether the transmission cable connected has a terminating resistor of 120
ohms. The relevant green LED lights up.
If one of the interface chains is not in use, you must set the relevant switch to
ON. The relevant green LED then remains off.
If you activate an unused interface, this will always result in a time-out,
irrespective of the position of the QVZ mode switch.
Figure 3-1 Monitoring of the Serial Interface Chain
OFF
OFF
OFF
OFF
OFF
ON
S3
123456
ON
5
ON
6
ON
5
ON
6
Monitoring of
chain 1 active
Monitoring of
chain 2 active
Monitoring of
chain 2 off
Monitoring of
chain 1 off
3-4 EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
3.4.2 Baud rate
You will achieve the greatest possible noise immunity on your data transmission
line if you select the lowest possible baud rate. However, you must take the
required response speed of the process into account. The response speed drops
with the baud rate.
Set the same baud rate for all nodes as that set for the 308-3 interface module.
The baud rate of the transmission line is set using switches S3.1 and S3.2.
Figure 3-2 Setting the Baud Rate
12121212
31,2562,5187,5375
OFF
S3 ON
123456
Baud rate in bps
EWA 4NEB 812 6051-02a 3-5
Start-Up 308-3 Interface Module
3.4.3 QVZ Mode
You can activate or deactivate QVZ mode with switch S.3.3. To operate the
module and the relevant I/O modules under normal SIMATIC S5 conditions
(time-out when module is unplugged, etc.), QVZ mode must be activated
(switch S3.3 in the OFF position).
The 308-3 interface module transmits the READY (RDY) signal for all those
modules which were plugged in during configuration and which were assigned
addresses in the EPROM submodule using COM ET 100U communications
software.
However, it may be useful to switch off QVZ mode during the start-up
procedure of your system (switch S3.3 to ON), in order to test the system section
by section, for example.
Unplugging a module will not then result in a time-out.
It is necessasry to program the relevant organization block (QVZ-OB) to prevent
the CPU from stopping in the event of a time-out. You will find more details in
your programmable controller manual.
Figure 3-3 Selecting the QVZ Mode
OFF
OFF
OFF
S3 ON
123456
ON
3
ON
3
QVZ mode active
QVZ mode off
3-6 EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
The 308-3 interface module will react differently to errors in the I/O modules,
depending on which QVZ mode you have selected.
QVZ Mode Active
Table 3-1 Response to Errors when QVZ Mode Activated
*You will find an explanation of the various diagnostics bits in the chapter on Error Diagnostics
( Chapter 4)
Output data of the
relevant module set to 0 in
the dual-port RAM
Input data of the relevant
module set to 0 in the
dual-port RAM
308-3 interface
module generates
READY signal
Diagnostics
bit*
no
yes
no
no
no
no
no
yes
yes
no
yes
yes
yes
yes
yes
yes
yes
no
yes
yes
yes
yes
yes
yes
a
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F0
F1
F2
F3
F4
F5
F6
BASP
QVZ Mode Inactive
Table 3-2 Response to Errors when QVZ Mode Off
*You will find an explanation of the various diagnostics bits in the chapter on Error Diagnostics
( Chapter 4)
** In this case, the data in the relevant module is set to 0.
Diagnostics
bit* 308-3 interface
module generates
READY signal
Input data of the relevant
module set to 0 in the
dual-port RAM
Output data of the
relevant module set to 0 in
the dual-port RAM
F0
F1
F2
F3
F4
F5
F6
BASP
yes
yes
yes
yes
yes
no
no
yes
yes
no
yes**
yes
no
yes
yes
no
yes**
no
no
yes**
no
yes
yes
yes
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a
If the 308-3 interface module does not generate a READY Signal, it will not
transfer any data to the S5 bus and the CPU will not recognize a time-out. If you
want the CPU to continue to run after a time-out, you must take the CPU's
response in this situation into account (see the relevant PC manual).
EWA 4NEB 812 6051-02a 3-7
Start-Up 308-3 Interface Module
3.4.4 Diagnostics Address
A diagnostics byte is stored in the 308-3 interface module for each node
( Chap. 4). You can set the diagnostics address for each diagnostics byte with
switch S1.
The diagnostics address must be set in the P area within the limits m = 128 to
255. In the case of page addressing, the diagnostics address must be set in the
initial page area Qn within the limits m = 0 to 254.
Note:
Assign diagnostics addresses from 255 or 254 down (one diagnostics address
per 308-3 interface module). The diagnostics address occupies both the input
and output byte.
a
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The diagnostics address set can be used for neither input modules nor output
modules.
Set the desired diagnostics address on switch 1 by pressing the switch with the
desired weight or significance down into the ON position.
The sum of the weights set must correspond to the desired diagnostics address
( Figure 3-4).
Figure 3-4 Typical Diagnostics Address Setting
12
ON
12345678
48163264128Weight
Diagnostics address set: 1 + 16 + 128 = 145
3-8 EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
3.4.5 Setting the Input/Output Areas or Page Areas
Note:
This section is only of interest if you are using page addressing.
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Set the I/O areas or the page areas by positioning the X3, X9, and X11 plug-in
jumpers on the module ( 1.2) according to the following instructions.
The symbol: • represents a plugged-in jumper.
In the case of interface modules operated in page mode, the positioning of the
plug-in jumpers also depends on the module slot. The reason for this is that, if
several interfaces are operated in page mode, only the interface module with
the highest slot number (the one furthest from the CPU) generates a READY
signal.
Nonpage Mode ( P, Q, IM3, IM4)
•Position the plug-in jumpers in the same way in all modules, irrespective of
how many 308-3 interface modules there are in your central controller:
Jumper
X3 Jumper
X9 Jumper
X11
• •
Page Mode ( Qn, Qn +1, Qn +2, Qn +3 )
•If you are operating only one 308-3 interface module in your central
controller:
Jumper
X3 Jumper
X9 Jumper
X11
•
EWA 4NEB 812 6051-02a 3-9
Start-Up 308-3 Interface Module
•If you are operating several 308-3 interface modules in your central
controller, locate the jumper in the page mode interface module with the
highest slot number (module furthest from the CPU) as follows:
Jumper
X3 Jumper
X9 Jumper
X11
•
The other interface modules operating in page mode do not have jumpers
plugged in:
Jumper
X3 Jumper
X9 Jumper
X11
Mixed Mode, Page and Nonpage
•All 308-3 interface modules operated in nonpage mode:
Jumper
X3 Jumper
X9 Jumper
X11
•
•If you are operating only one 308-3 interface module in page mode:
Jumper
X3 Jumper
X9 Jumper
X11
•
3-10 EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
•If you are operating several 308-3 interface modules, locate the plug-in
jumper in the interface module with the highest slot number (furthest from
the CPU) as follows:
Jumper
X3 Jumper
X9 Jumper
X11
•
The other interface modules operating in page mode do not have jumpers
plugged in:
Jumper
X3 Jumper
X9 Jumper
X11
Note:
Do not discard the remaining jumpers. Keep them in a safe place in case
your system has to be modified at a later date.
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EWA 4NEB 812 6051-02a 3-11
Start-Up 308-3 Interface Module
3.4.6 Initial Page Area
Note:
This section is only of interest if you are using page addressing.
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You can set the initial page area for all 309-3 interface modules in steps of four
using switch S2.
Figure 3-5 Selecting the Initial Page Area with Switch S2
ON
123456
48163264128Weight
Parameter n = 0, 4, 8, 12 to 252
If you have several 308-3 interface modules in one central controller, you can
select the same initial page area for all or assign different areas to each.
However, make sure that no double addresses occur within the same page area.
Your selection of an initial page area for a 308-3 interface module will establish
the four page areas Qn, Qn+1, Qn+2, and Qn+3 for that module.
For example, if you select initial page area 16,
Qnwill be called with parameter 16
Qn+1 will be called with parameter 17
Qn+2 will be called with parameter 18
Qn+3 will be called with parameter 19
3-12 EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
In this chapter, under the heading "Page Selection", you will learn which STEP 5
operations you need to access a page area. You can have 255 bytes of input
data and 255 bytes of output data in each page area.
You must preset a given node according to the page area within which you wish
to communicate with that node.
This area is set in the 318-3 interface module using Switch S2, and in the ET 100U
and ICM 560 using COM ET 100 communications software. Setting is the same as
for areas P, Q, IM3 und IM4 in the case of normal addressing.
For this purpose: Qncorresponds to area P
Qn+1 corresponds to area Q
Qn+2 corresponds to area IM 3
Qn+3 corresponds to area IM 4
Setting the Initial Page Area
Set the selected initial page area at Switch S2 by pressing the switch with the
relevant value down into the ON position.
The sum of the values set must correspond to the initial page area
( Figure 3-6).
Figure 3-6 Typical Initial Page Area Setting
ON
123456
48163264128Weight
Initial page area set: 8 + 16 + 64 = 88
This allows you to access page areas 88 to 91.
EWA 4NEB 812 6051-02a 3-13
Start-Up 308-3 Interface Module
Page Selection
Address 255 (F1FFH) is reserved for page selection in the Q area.
The following operations are used for page selection:
L KB n where n= 0 to 255 (desired page area)
T QB 255
This selects page area n. You can now use any of the load and transfer
operations of the Q area (byte and word operations).Your page selection
applies until you select a new area.
Data exchange then takes place in this new page area.
3.5 Transmission Time of the Serial Transmission Link
Specific transmission times are required in order to update the contents of the
buffer (dual-port RAM) of the 308-3 interface module. These transmission times
depend on the individual module configuration and the baud rate set.
You will find the relevant values in the following tables.
Transmission Time tET Between the 308-3 Interface Module and the 318-3
Interface Module (ET 100U)
Table 3-3 Transmission Time tET
Baud rate Transmission Time tET
375,000 bps
187,500 bps
62,500 bps
31,250 bps
a x 0.7 ms/ET + b x 0.04 ms/Byte
a x 1.0 ms/ET + b x 0.07 ms/Byte
a x 2.0 ms/ET + b x 0.19 ms/Byte
a x 3.4 ms/ET + b x 0.36 ms/Byte
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Parameters a and b are defined as follows:
a=Total number of ET 100Us connected to the 308-3 interface modue
(both chains)
b=The sum of all input and output bytes of all ET 100Us
3-14 EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
Transfer Time tEU Between the 308-3 Interface Module and the 318-3 Interface
Module (Expansion Unit)
By defining the module addresses in the expansion unit without gaps, you can
achieve minimal transmission times on the serial transmission link. Each address
gap generates new messages with additional address header and control
characters.
This increases the transmission time tEU.
Table 3-4 Transmission time tEU
Baud rate Transmission time tEU
c x 3.0ms/EU + d x 0.09 ms/byte
c x 4.5ms/EU + d x 0.12 ms/byte
c x 8.5ms/EU + b x 0.25 ms/byte
c x 13.0 ms/EU + b x 0.40 ms/byte
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375,000 bps
187,500 bps
62,500 bps
31,250 bps
Parameters c and d are defined as follows:
c=Total number of expansion units connected to the 308-3 interface module by
the 318-3 interface module (both chains)
d=Sum of all input and output bytes of all expansion units.
Transmission Time tICM Between the 308-3 Interface Module and the ICM 560
Table 3-5 Transmission time tICM
Baud rate Transmission time tICM
e x 1.0ms/ICM
e x 1.5ms/ICM
e x 3.5ms/ICM
e x 6.3 ms/ICM
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375,000 bps
187,500 bps
62,500 bps
31,250 bps
Parameter c is defined as follows:
e = Total number of ICM 560 individual control modules connected to the
308-3 interface module (both chains)
EWA 4NEB 812 6051-02a 3-15
Start-Up 308-3 Interface Module
Total Transmission Time tT
The total transmission time tT is calculated as follows in the case of a mixed
configuration of expansion units, ET 100Us and ICM 560s:
tT = tEU + tET + tICM
Transmission time tT is the time required for a whole cycle. At the end of this
time, the status information of, for example, an input in the buffer (dual-port
RAM) of the 308-3 interface module is updated.
The time required for data transmission on the I/O bus of the modules
connected must be taken into account as well as the transmission time of the
serial transmission link:
• See Manual 6ES5 998-2ET11 for the transmsission times of the ET 100U I/O
bus. 1 ms per byte of input/output data is a typical value.
• In the expansion unit, data transmission to the I/O modules is via the
parallel S5 bus. The time required for this is negligible and already
accounted for in tEU.
• The internal response times for the ICM 560 individual control module are
given in Manual 6ES5 998-0KC11, but these times are already accounted for
in tICM.
Note:
From version 308-3UA12 upwards, the 308-3 interface module has a minimum
cycle time which depends on the baud rate set.
At 375,000 bps the cycle time is 3 ms
at 187,500 bps 5 ms
at 62,500 bps 12 ms
at 31,250 bps 40 ms
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3-16 EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
Example for the Calculation of the Transmission Time tT
The calculation is based on the following module configuration.
The baud rate is set at 187,500 bps.
Figure 3-7 Module Configuration for Calculating the Transmission Time
The input/output modules of the U range have the following data capacities:
Legend:
DI = Digital Input Module
DQ = Digital Output Module
AI = Analog Input Module
AQ = Analog Output Module
Table 3-6 Data Capacity of Digital Modules
Baud rate Data capacity
4 DIs or 4 DQs
8 DIs or 8 DQs
16 DIs or 16 DQs
32 DIs or 32 DQs
bytes
1 bytes
2 bytes
4 bytes
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EWA 4NEB 812 6051-02a 3-17
Start-Up 308-3 Interface Module
Table 3-7 Data Capacity of Analog Modules
Baud rate Data capacity
2 AIs or 2 AQs
4 AIs or 4 AQs
8 AIs or 8 AQs
16 AIs or 16 AQs
4 bytes
8 bytes
16 bytes
32 bytes
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Each ICM 560 individual control module takes up four input bytes and four
output bytes (32 DIs and 32 DQs).
• There are three ET 100Us connected to the 308-3 interface module
represented in Figure 3-7.
Data capacity in the individual ET 100Us is as follows:
ET No. 1: 8 bytes
No. 2: 3 bytes
No. 3: 19 bytes
Total b = 30 bytes
Incomplete half-bytes within one ET 100U
are expanded into full bytes, in this case:
1 bytes DI 2 bytes
bytes DQ 1 bytes
Total 3 bytes
This defines all the variables required for the calculation:
The transmission time tET is derived as follows:
tET = a x 1.0 ms/ET + b x 0.07 ms/ bytes=
= 3 ET x 1.0 ms/ET + 30 bytes x 0.07 ms/ bytes= 5.1 ms
Value from Table 3-3
3-18 EWA 4NEB 812 6051-02a
308-3 Interface Module Start-Up
• There are two further ICM 560 individual control modules connected
(e = 2).
The transmission time tICM is derived as follows:
tICM = e x 1.5 ms/ICM
2 ICM x 1.5 ms/ICM = 3 ms
Value from Table 3.5
• Finally, two more expansion units are added (c=2).
Data capacity in the individual expansion units is as follows:
EG No. 1: 36 bytes
No. 2: 4 bytes
Total d = 40 bytes
This defines all the variables required for the calculation:
The transmission time tEU is derived as follows:
tEU = c x 4.5 ms/EU + d x 0.12 ms/byte =
= 2 EU x 4.5 ms/EU + 40 bytes x 0.12 ms/bytes = 13.8 ms
Value from Table 3.4
• The total transmission time tT is calculated as follows:
tT=t
ET + tICM + tEU
tT= 5.1 ms + 3 ms + 13.8 ms = 21.9 ms
EWA 4NEB 812 6051-02a 3-19
4 Error Diagnostics
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4.1 Accessing the Diagnostics Byte. . . . . . . . . . . . . . . . . . . 4 - 1
4.2 Diagnostics Byte for Expansion Units
and Group Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4- 2
4.3 Diagnostics Byte for ET 100U and ICM 560. . . . . . . . . 4 - 3
EWA 4NEB 812 6051-02a
308-3 Interface Module Error Diagnostics
4 Error Diagnostics
Faults on the transmission link or at the nodes communicating with the 308-3
interface module can have various causes. This chapter is designed to help you
to detect and remove faults.
4.1 Accessing the Diagnostics Byte
A diagnostics byte is stored for every node in the 308-3 interface module
plugged into the central controller . The diagnostics byte for ET 100U electronic
terminators for distributed I/O and for ICM 560 individual control modules is
stored under the number of the relevant unit (Nos. 1 to 63).
The diagnostics byte for expansion units and group messages is stored under
No. 0.
The diagnostics bytes of all nodes are stored in the buffer (dual-port RAM) of
the 308-3 interface module, and can be referenced by load and transfer
operations.
You must set the address of the diagnostics byte (diagnostics address) on the
module ( 3.4.4).
Accessing the diagnostics byte:
L KB i i = 0 for expansion units
i = 1 to 63 for ET 100Us and ICM 560
T PY m m = 128 to 255 (diagnostics address)
LPYm
If you use the STUDOS (S0; S1) operating system in the programmer (PG 675,
earlier version), you must write the T PB m and L PB m operations in place of the
T PY m and L PY m operations.
If you are using page addressing for the 308-3 interface module, you must note
that the diagnostics byte can only be read in the initial page area Qn (n= 0, 4, 8,
12 to 252). Access is then as follows:
L KB n Select initial page area
T QB 255
L KB i i = 0 for expansion units
i = 1 to 63 for ET 100U and ICM 560
T QB m m = 0 to 254 (diagnostics address)
LQBm
EWA 4NEB 812 6051-02a 4-1
Error Diagnostics 308-3 Interface Module
This means you can respond quickly to specific error states by making bit
comparisons. To avoid a time-out being activated by an error and causing the
CPU to stop ( 3.4.3), it is necessary to program the relevant organization
block.
Note:
• Diagnostics bits can occur in combinations.
• Error information is scanned cyclically. This can mean that errors which
appear briefly are not captured and the relevant diagnostics bits are not set.
• Error messages are not stored.
Exception: Diagnostics bits which existed before the generation of FO
remain set.
4.2 Diagnostics Byte for Expansion Units and Group Messages
Diagnostics byte No. 0 contains both group messages concerning all I/O
modules and the diagnostics bits for expansion units. You can tell from the bit
pattern whether an error has occurred and, if so, which error. The relevant bit
then has signal state "1".
Bit 7 654 321 0
BASP F6 F5 0 0 F2 0 F0
Group Messages Concerning All I/O Modules
F5: • The 308-3 interface has read an unknown identifier from the EPROM
submodule. Check the identifiers used.
F6: • The mode selector of the 308-3 interface module is in the OFF position
or there is interference on the transmission link (e.g. the interface
connector has been unplugged, the transmission line has been
interrupted, or the terminating resisitor is missing).
• The measuring circuit has detected excessive loop resistance.
4-2 EWA 4NEB 812 6051-02a
308-3 Interface Module Error Diagnostics
Diagnostics Bits for Expansion Units
F0: • One or more expansion units no longer accessible:e.g. interface
module power supply has failed, the interface connector has been un-
plugged, the 318-3 interface module has been disconnected, the line
has been interrupted.
• Frequent interference on the transmission line:
Messages are repeated twice; if no valid data is received (BCH check),
the unit is no longer accessible. However, the 308-3 interface module
will try to access the expansion unit once in each subsequent cycle. If a
connection is established, data transmission is resumed.
F2: • I/O modules disconnected, enable voltage missing:
One or more I/O modules are not in their slots, or do not report
(READY signal). This fact is also indicated by a time-out (QVZ) if the
QVZ mode is activated.
BASP:• Command output disable activated (BASP can be output both by the
CPU and by the 318-3 interface module).
0: • Bits meaningless
4.3 Diagnostics Byte for the ET 100U and the ICM 560
You can tell from diagnostics bytes Nos. 1 to 63 (depending on the ET No. or the
ICM 560 No.) whether an error has occurred in an ET 100U or an ICM 560 and, if
so, which error. The relevant bit then has signal state "1".
Bit 7 654 321 0
BASP 0 0 F4 F3 F2 F1 F0
EWA 4NEB 812 6051-02a 4-3
Error Diagnostics 308-3 Interface Module
F 0: • One or more ET 100Us or ICM 560s no longer accessible: e.g. power
supply has failed, the interface connector has been unplugged, the
interface module has been disconnected, or the line has been inter-
rupted.
• Frequent interference on the transmission line:
Messages are repeated twice; if no valid data is received (BCH check),
the unit is no longer accessible. However, the 308-3 interface module
will try to access the expansion unit once in each subsequent cycle. If a
connection is established, data transmission is resumed.
F 1: • Load voltage missing or output short-circuit to M:
A readback module (e.g.: 6ES5 440-8MA...) reports that the load
voltage has failed, or at least one output has a short-circuit to M.
F 2: • I/O modules unplugged:
One or more I/O modules configured using COM ET 100U are not in
their slots. This fact is also reported by a time-out (QVZ) if the QVZ
mode is activated on the 308-3 interface module. The time-out applies
to all addresses used in the relevant ET 100U.
F 3: • I/O bus error or wrong bus units connected:
Interference on the shift register bus of the ET 100U.
Maximum configuration has been exceeded.
ET 100U configuration does not agree with configuration in COM ET
100U.
F 4: • Wrong output activated:
The output of a readback module (e.g.: 6ES5 440-8MA...) is "1",
although it was driven with a "0" signal.
Process wiring is shorted to L+.
Module driver is defective (output transistor has failed).
BASP:• Command output disable activated (BASP can be output both by the
CPU and by the 318-3 interface module).
0: • Bits meaningless.
4-4 EWA 4NEB 812 6051-02a
5 Technical Specifications
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5.1 Technical Specifications of the
308-3 InterfaceModule . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 1
5.2 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . 5 - 3
EWA 4NEB 812 6051-02a
308-3 Interface Module Technical Specifications
5 Technical Specifications
5.1 Technical Specifications of the 308-3UA12
Interface Module
Can be plugged into S5-135U, S5-150U, S5-155U; S5-115U with
(6ES5 308-3UA12) adapter casing; ( Chap. 2.1)
Address areas P, Q, IM3, IM4
- in the case of page addressing Qn, Qn+1, Qn+2, Qn+3
Page addressing Duplication of the Q area possible
Initial page addresses max. 64, can be set on the interface module
Transmission method Serial, party line
Synchronization procedure Asynchronous, half-duplex
Baud rate 375,000/187,500 /62,500/31,250 bps,
switch-selectable
Data security at
- 375,000 bps 1 check byte per 18 data bytes
= Hamming distance 3
- Other baud rates 2 check bytes per 18 data bytes
= Hamming distance 5
Noise immunity at Enhanced by a low-pass filter
low baud rates
(62,500/31,250 bps)
Number of interfaces 1 with 2 electrically isolated connections
(floating, parallel)
Design Similar to EIA RS-485 standard
No. of modules per interface max. 32 ETs or EUs
No. of nodes per interface max. 64,
but max. 63 ETs or ICMs
EWA 4NEB 812 6051-02b 5-1
Technical Specifications 308-3 Interface Module
Input voltage for max. 5V, symmetrical
receiving
Output voltage for max. 5V, symmetrical
transmitting
Max. cable length for
- 375,000 baud 0.5 km/0.3 miles per interface chain
- 187,500 baud 1.0 km/0.6 miles per interface chain
- 62,500 baud 1.0 km/0.6 miles per interface chain
- 31,250 baud 3.0 km/1.8 miles per interface chain
Conductor cross-section 0.5 to1.5 mm2, (20 to 15 AWG), stranded
Transmission cable Shielded; twisted pair
Insulation voltage 75 V DC/ 60 V AC,
to VDE 0160 tested with 500 V AC
(cable connections
to ground point)
Current consumption 0.5 A
(internal, 5 V,
from the central controller)
376 memory submodule (EPROM) 8K words
6ES5 376- . AA11
(only required whenET 100U or
ICM 560 connected)
Weight approx. 400 g/14 oz.
5-2 EWA 4NEB 812 6051-02b
308-3 Interface Module Technical Specifications
5.2 Connector Pin Assignments
DBZ
2 M +5 V
4 PESP
6 ADB12 ADB0 CPKL N *
8 ADB13 ADB1 MEMR N
10 ADB14 ADB2 MEMW N
12 ADB15 ADB3 RDY N
14 ADB4 DB0
16 ADB5 DB1
18 ADB6 DB2
20 ADB7 DB3
22 ADB8 DB4
24 ADB9 DB5
26 ADB10 DB6
28 ADB11 DB7
30 BASP
32 M M
Backplane
connector X1: PIN NO. SIG. NAME SIG. NAME SIG. NAME
* CPKL N corresponds to the RESET signal in the S5-115U.
EWA 4NEB 812 6051-02b 5-3
Technical Specifications 308-3 Interface Module
*CPKLA N is applied via jumper X14 PIN 2/3 (Caution! There are +5V on interface positions here)
** CPKLA N is applied via jumper X14 PIN 1/2 (as supplied)
DBZ
2 M +5V
4
6
8
10
12
14 CPKLA N*
16
18 CPKLA N**
20
22
24
26
28
30
32 M M
PIN NO. SIG. NAME SIG. NAME SIG. NAME
Backplane
connector X2:
5-4 EWA 4NEB 812 6051-02b
6 Spare Parts
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EWA 4NEB 812 6051-02a
308-3 Interface Module Spare Parts
6 Spare Parts
Interface connector 4NES 812 2203-01000
Resistance 120 ohms, 0.25 W, 5 % Commercial
Coding socket W79070-G2602-N2
EPROM submodule 6ES5 376- . AA11
EWA 4NEB 812 6051-02a 6-1
7 Index
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EWA 4NEB 812 6051-02a
308-3 Interface Module Index
7 Index
A
Adapter casing 2-3
Addressing 2-11
Address of the diagnostics
byte 4-1
B
Baud rate 3-3, 3-5
Block-type module 1-2, 2-3
Buffer 1-1
C
Cable
- design
- types
- unfamiliar
2-5
2-5
2-4
2-7
Chain watchdog 3-4
Coding switches 1-2, 3-3
COM ET 100 1-1, 3-1, 3-6
Compact
- controller
- module 2-3
1-2
Communications software 1-1, 3-6
Configuration
- run 3-6
3-1
D
Data- exchange
- traffic
- transfer
2-11, 3-2
1-1
2-4
Default settings 3-3
Device configuration 1-4
Diagnostics
- address
- byte 2-11, 3-8
3-8, 4-1, 4-2, 4-3
Dual-port-RAM 1-1
Duplication of the Q area 2-12
E
EPROM submodule 1-1, 2-11, 3-1,
3-6
ET 100U
- electronic terminator
for distributed I/O
1-1, 2-11, 2-13,
3-16
1-1
F
FAULT 1-2
I
ICM 560
- individual control
module 1-1, 2-13, 3-16
Initial page area
- setting 3-8, 3-12
3-13
I/O bus 3-16
Input / output area
- setting 2-11
3-9
Interface module 318-3 1-1, 2-11, 2-13
M
Minimum cycle time 3-16
Mode selector 1-2, 3-1
P
Page addressing 2-12, 3-8, 3-9,
3-12, 4-1
Page area
- selection
- setting 3-14
3-9
Q
QVZ mode
- active
- inactive
3-2, 3-4, 3-6
3-7
3-7
EWA 4NEB 812 6051-02a 7-1
Index
308-3 Interface Module
R
Response speed 3-5
S
Serial interface 3-2
Start-up 3-1
Surge diverter 2-10
T
Terminating resistor 2-9, 3-2, 3-4
Time-out 3-2, 3-4, 3-6, 4-2
Transfer buffer 1-1
Transmission cable
- connecting
- electrical characteristics
- laying
- protection against
lightning
- shielding
2-4, 3-2, 3-4
2-8
2-6
2-9
2-10
2-9
Transmission time 3-14
Twisted-pair cable 2-4
7-2 EWA 4NEB 812 6051-02a
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