Siemens Simatic S7-1500R - Interrupts, Diagnostics, Error Messages and System Events; Status and Error Display of the CPU; LED Display

The figure below shows a configuration of the S7-1500H with S2 devices in a line topology.
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① H-CPU
② Redundancy connections (fiber-optic cables)
③ IO device (with system redundancy S2)
④ Switch
⑤ PROFINET cable (line topology)
⑥ HMI device
Figure 4-7S7-1500H configuration with S2 devices and switch in a line topology
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
System overview
4.1 What is the S7-1500R/H redundant system?