Rules For The Assembly Of Fault-Tolerant Stations - Siemens SIMATIC S7-400H System Manual

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