Siemens SIMATIC PCS 7 Function Manual page 38

Fault-tolerant Solutions in PCS 7
3.1 Solutions for the I/O
Required software and configuration
You select and configure the redundant modules in HW Config.
● In order for both subsystems of the H system to be able to address redundant input/output
modules, S7 driver blocks from the "Redundant I/O" library and PCS 7 driver blocks from
the
● Modules with the same article number and version number are configured redundantly to
one another
You interconnect the signals in the CFC chart. You can find information on this in the section
"Configuration of redundant signals (Page 141)".
When the user program is compiled, the required driver blocks are placed, interconnected and
configured automatically.
Reaction to a channel fault
You can define the passivation characteristics, for example how redundant input/output
modules react to a channel fault (such as broken wire, short-circuit on the signal line). The
reaction to a channel fault depends on the following aspects:
● Module employed
● Configuration
● Version of the PCS 7 library
– As of PCS 7 V7.1, the potential passivation reaction is automatically detected based on
– Only the module-based passivation reaction can be selected with the Redlib V3.x library.
– You can set the channel-based passivation reaction with the Redlib library as of V4.
You will find information on the passivation reaction for individual modules in the
documentation
Additional information
● Section "How to configure redundant I/O modules (Page 129)"
● Section "Failure of redundant I/O modules (Page 189)"
● Section "How to set the failure reaction of the input/output modules on the CPU
(Page 105)"
● Manual
● Online help for
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PCS 7 Library as of PCS 7 V6.0 are required in addition to the necessary hardware.
the configured modules. The passivation reaction is set channel-by-channel.
PCS 7 - Released Modules .
Automation System S7-400H; Fault-tolerant Systems
STEP 7
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA