S7-400H setup options
3.2 Rules for the assembly of fault-tolerant stations
S7-400H
System Manual, 03/2012, A5E00267695-11
33
3.2 Rules for the assembly of fault-tolerant stations
The following rules have to be complied with for a fault-tolerant station, in addition to the
rules that generally apply to the arrangement of modules in the S7-400:
● The CPUs have to be inserted in the same slots.
● Redundantly used external DP master interfaces or communication modules must be
inserted in the same slots in each case.
● External DP master interfaces for redundant DP master systems must only be inserted in
central units rather than in expansion devices.
● Redundantly used modules (e.g. CPU 41x-5H PN/DP, DP slave interface module IM 153-
2) must be identical, i.e. they must have the same order number, the same product
version or firmware version.
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