Product information
2.3 The new functions for the IM 153-4
Interface modules IM 153-4 PN and IM 153-2 HF
14 Product Information, 07/2016, A5E02714952-AG
The new functions for the IM 153-4
Media redundancy
Function for ensuring the network and system availability. Redundant transmission links (ring
topology) ensure that an alternative communication path is made available if a transmission
link fails.
You can find additional information in the STEP 7 online help and the PROFINET system
description (http://support.automation.siemens.com/WW/view/en/19292127) manual.
The "Shared Device" function allows the submodules of an IO device to be divided up
among different IO controllers.
The following conditions apply for an ET200M if it is to be operated as a shared device.
You can find additional information in the STEP 7 online help and the PROFINET system
description (http://support.automation.siemens.com/WW/view/en/19292127) manual.
The following applies to the ET 200M:
● If an IO controller fails, the entire IO device outputs substitute values. This means that not
only do the IO modules of the failing IO controller output substitute values, but also the
IO modules of the intact IO controller.
● Since the outputs of an IO module cannot separately output substitute values, in the
shared device environment the I/O will only output process values if both IO controllers
are in RUN.
As soon as an IO controller is in STOP mode, the outputs of that IO module that are
subscribed by the other IO controller will therefore output substitute values. This fact must
be taken into account, for example, for the STEP 7 functions, "Modify" and "Force". With
the STEP 7 "Modify" and "Force" functions, a CPU in STOP mode will be reported as
being in RUN mode. This releases the modules that are assigned to the other controller
that is still in RUN.
Configuration as Shared Device
"IM153-4 PN ST as of V3.0 Shared Device" or "IM153-4 PN HF as of V3.0 Shared Device"
must be used for the configuration of shared device. The remaining configuration is done in
the usual way.
When configuring as a shared device, you have to insert OB 83, OB 85 and OB 122 in the
block list. The transition from STOP to RUN generates so-called "Return of submodule"
alarms. The alarms are intercepted by the OB 83, otherwise the CPU would go into STOP.
Both IO controllers that share the device must be in "RUN" in order for the IM 153-4 PN to be
able to send data to the I/O.
See also STEP 7 documentation
(http://support.automation.siemens.com/WW/view/en/10805384/133300).