Siemens SIMATIC S7-1500 System Manual page 82

The redundancy connections in S7-1500R are the PROFINET ring with MRP. The CPUs are
synchronized over the PROFINET ring.
① System power/load current supply (optional)
② CPU S7-1515R-2 PN
③ PROFINET cable (redundancy connections, PROFINET ring)
④ IO device in the PROFINET ring
⑤ Switch
⑥ IO device outside the PROFINET ring (separated with a switch)
Figure 5-11 S7-1500R configuration variant
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
5.1 What is the S7-1500R/H redundant system?
System overview
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