Siemens Simatic PCS 7 Function Manual page 141

Example configuration
The figure below shows the setup for peripheral modules in IO Redundancy in a ET 200SP
HA configuration.
Method of operation in the example configuration
"Signal Module 1" is configured redundantly to "Redundant Signal Module 1". As a result,
Signals I1.1 and I2.1 are redundant to one another.
If a fault is detected in "Signal module 1", the user program continues to work with the address
I1.1, but the signal comes from the address I2.1. The user program does not detect an error
since the signal status is still correct. The event generates a diagnostic message that provides
information about the passivated signals.
As of PCS 7 V9.0, the passivation reaction of the redundant I/O modules are set for channel-
based reaction to channel faults. Additional information about passivation reaction is available
in the section "How to set the CPU for the reaction of the input/output modules to channel
faults".
Requirements
● The PCS 7 project involving a CPU 410-5H must have been created and opened in
SIMATIC Manager.
Procedure
1. In the component view, select the SIMATIC H station and double-click the "Hardware"
object in the detail window.
HW Config opens.
2. If the hardware catalog is not visible, select the View > Catalog menu command.
The hardware catalog opens.
3. Select the IM 155-6 HA (ET 200SP HA) in which you want to configure the redundant
module.
The module overview is displayed in the lower window pane.
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA
Advantages of high availability components
Sensor
5.4 Distributed I/O
141