PROFINET
8.8 System redundancy
S7-400H
106 System Manual, 03/2012, A5E00267695-11
8.8 System redundancy
System redundancy is the connection of IO devices via PROFINET with a communication
connection between each IO device and each of the two fault-tolerant CPUs. This
communication connection can be set up using any topological interconnection. The
topology of a system alone does not indicate if an IO device is integrated in system
redundancy.
Contrary to a one-sided connection of IO devices, the failure of a CPU does not result in the
failure of the IO devices connected with this CPU.
Requirement
You need the following component versions to set up a fault-tolerant system with system-
redundant I/Os:
● CPU 41x-5H PN/DP as of version 6.0
● IM 153-4BA00 as of version 4.0
● STEP7 as of V5.5, SP2 HF1
Configuration
The figure below shows a configuration with two IO devices connected in system
redundancy.
Figure 8-2 S7-400H system with IO devices connected in system redundancy
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