Redundant Actuators And Sensors - Siemens SIMATIC PCS 7 Function Manual

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 with the same order number and version number can be paired in redundant
You interconnect the signals in the CFC chart. Additional information on this is available in the
section "Configuration of redundant signals (Page 126)".
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
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 112)"
● Section "Failure of redundant I/O modules (Page 175)"
● Section "How to set the failure reaction of the input/output modules on the CPU (Page 95)"
● Manual
● Online help for
3.1.3.3

Redundant actuators and sensors

Failure detection
Actuators and sensors on the field level can be configured redundantly for PCS 7. Depending
on the I/O module to which the redundant actuators or sensors are connected, failure of an
actuator or sensor can be detected and reported to the process control system as an error. If
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modules, S7 driver blocks from the "Redundant I/O" library and PCS 7 driver blocks from
PCS 7 Library as of PCS 7 V6.0 are required in addition to the necessary hardware.
the
configurations.
– As of PCS 7 V7.1, the potential passivation reaction is automatically detected based on
the configured modules. The passivation reaction is set channel-by-channel.
– 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.
PCS 7 - Released Modules .
Automation System S7-400H; Fault-tolerant Systems
STEP 7
Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02