Siemens SIMATIC PCS 7 Function Manual page 134

Advantages of fault-tolerant components
4.4 Distributed I/O
Procedure
1. Configure redundant modules for HART field devices in HW Config as described in section
"How to configure redundant I/O modules (Page 129)".
In the example, the module on slot 6 is configured in each case:
– ET 200M station with PROFIBUS address 4: Module 6
– ET 200M station with PROFIBUS address 6: Module 6
2. Place the "HART field device" in the detail view of the redundant module.
In the example, module 6 on ET 200M station with PROFIBUS address 4.
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Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA