Siemens SIMATIC S7-400H System Manual page 233

Fault-tolerant systems

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The following examples and the possible configurations in STEP 7 are based on a maximum

of two subnets and a maximum of 4 CPs in the redundant fault-tolerant system.

Configurations with a higher number of CPs or networks are not supported in STEP 7.

System Manual, 03/2012, A5E00267695-11

14.2 Basics and terminology of fault-tolerant communication

Example that shows that the number of resulting partial connections depends on the

configuration

Communication