Siemens SIMATIC S7-1500 System Manual page 28

System overview
4.1 What is the S7-1500R/H redundant system?
The following figure shows a configuration of the S7-1500H in a PROFINET ring.
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②
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Figure 4-5 S7-1500H configuration with IO devices in the PROFINET ring
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H-CPU
PROFINET cable (PROFINET ring)
Redundancy connections (fiber-optic cables)
IO device
Switch
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD