Siemens SIMATIC PCS 7 Function Manual page 76

Fault-tolerant Solutions in PCS 7
3.3 Solutions for communication
● You can connect a maximum of 31 field devices per PROFIBUS PA.
● The maximum power consumption of 1 A must not be exceeded. This figure includes all
components connected to the PROFIBUS PA.
Configuration
Examples for connections of field devices via AFD and AFS are shown in the following figures.
Figure 3-1
76
Redundant connection to the redundant PROFIBUS DP
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA