Siemens SIMATIC S7-400H - Page 233

Communication
14.2 Basics and terminology of fault-tolerant communication
S7-400H
System Manual, 03/2012, A5E00267695-11
233
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.
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configuration