Siemens SIMATIC S7-1500 System Manual page 30

System overview
4.1 What is the S7-1500R/H redundant system?
The figure below shows a configuration of the S7-1500H with S2 devices in a line topology.
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②
③
④
⑤
⑥
Figure 4-7 S7-1500H configuration with S2 devices and switch in a line topology
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H-CPU
Redundancy connections (fiber-optic cables)
IO device (with system redundancy S2)
Switch
PROFINET cable (line topology)
HMI device
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD