Figure 8-5 Pn/Io With System Redundancy - Siemens SIMATIC S7-400H System Manual

PROFINET
8.8 System redundancy
The figure below shows the system-redundant connection of nine IO devices using three
switches. This configuration, for example, allows you to arrange IO devices in several
cabinets.
Figure 8-5
Note
Logical structure and topology
The topology itself does not determine if IO devices are connected one-sided or in a
configuration with system redundancy. This is determined in thje course of configuration.
You can configure the IO devices in the first figure as one-sided instead of the system-
redundant setup.
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PN/IO with system redundancy
System Manual, 03/2012, A5E00267695-11
S7-400H