Siemens SIMATIC PCS 7 Function Manual page 70

Fault-tolerant Solutions in PCS 7
3.3 Solutions for communication
Configuration
Examples for connections of field devices via AFD and AFS are shown in the following figures.
Figure 3-1
70
Connection to a redundant PROFIBUS DP
Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02