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 always have to be inserted in the same slots.
● Redundantly used external DP master interfaces or communication modules must be
● External DP master interface modules for redundant DP master systems should only be
● Redundantly used modules (for example, CPU 417-4H, DP slave interface module IM 153-2)
S7-400H
System Manual, 09/2007, A5E00267695-03
inserted in the same slots in each case.
inserted in central racks, rather than in expansion racks.
must be identical, i.e. they must have the same order number, the same version, and the
same firmware version.
3.2 Rules for the assembly of fault-tolerant stations
S7-400H installation options
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