System and operating states of the S7–400H
11.3 The operating states of the CPUs
S7-400H
134 System Manual, 03/2012, A5E00267695-11
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.
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