Siemens SIMATIC PCS 7 Function Manual page 116

Advantages of fault-tolerant components
4.3 Communication connections
Result
The figure below shows the result of the configuration process in HW Config. Here, a distributed
I/O has already been assigned to the DP master systems for the purpose of illustrating the
redundancy principle:
Additional information
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STEP 7
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA