Siemens SIMATIC S7-400H System Manual page 134

Fault-tolerant systems

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Table of Contents

System and operating states of the S7–400H

11.3 The operating states of the CPUs

Redundant use of modules

The following rule applies to the redundant system mode:

Modules interconnected in redundant mode (e.g. DP slave interface module IM 153-2) must

be in identical pairs, i.e. the two redundant linked modules have the same order number and

product or firmware version.

System Manual, 03/2012, A5E00267695-11