Siemens SIMATIC S7-400H System Manual page 252

Communication
14.6 Communication via fault-tolerant S7 connections
Configuring connections
The PC must be engineered and configured as a SIMATIC PC station. Additional
configuration of fault-tolerant communication is not necessary at the PC end. The connection
configuration is uploaded from the STEP 7 project to the PC station.
You can find out how to use STEP 7 to integrate fault-tolerant S7 communication for a PC
into your OS system in the WinCC documentation.
Figure 14-18 Example of redundancy with fault-tolerant system and redundant bus system
Figure 14-19 Example of redundancy with a fault-tolerant system, redundant bus system, and CP
252
redundancy on PC.
System Manual, 03/2012, A5E00267695-11
S7-400H