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2.2 The new functions for the IM 153-4
Error in section 10.1 Pollutant concentration
This sentence is correct: The ET 200M distributed I/O system satisfies the requirements of
the standard ISA-71.04 serverity level G1;G2;G3.
2.2
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.
Shared Device
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.
10
Interface modules IM 153-4 PN and IM 153-2 HF
Product Information, 12/2013, A5E02714952-04
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