Siemens SIMATIC S7-1500 System Manual page 38

System overview
4.1 What is the S7-1500R/H redundant system?
The redundancy connections in S7-1500H are two duplex fiber-optic cables that connect the
CPUs directly with plug-in synchronization modules.
The figure below shows a configuration example of the S7-1500H in the PROFINET ring.
① Load current supply (optional)
② CPU 1517H‑3 PN
③ PROFINET cable (PROFINET ring)
④ Redundancy connections (2 duplex fiber-optic cables)
⑤ IO device in the PROFINET ring
⑥ Switch
⑦ IO device outside the PROFINET ring (separated with switch)
Figure 4-12 Configuration variant S7-1500H in PROFINET ring
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD