Siemens SIMATIC S7-1500 System Manual page 115

Redundancy scenario
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②
③
④
⑤
⑥
Figure 5-30 Failure of the two PROFINET cables in the PROFINET ring on the backup CPU
Sequence of events
1. Both PROFINET cables in the PROFINET ring upon failure of the backup CPU.
2. The redundant system will remain in the RUN-Redundant system state. The primary and
backup CPUs remain in the RUN-Redundant operating state.
3. The redundant system continues to reach all IO devices in the PROFINET ring.
4. The redundancy of the system is restricted. The restrictions have no effect on the process.
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Primary CPU
Backup CPU
Two fiber-optic cables (redundancy connections)
IO device ET 200SP
IO device ET 200MP
PROFINET cables (PROFINET ring) → interrupted
Application planning
5.4 Redundancy scenarios
115