Application planning
6.5 Failure scenarios
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
215
Failure scenario
Two fiber-optic cables (redundancy connections)
PROFINET cables (PROFINET ring) → interrupted
Figure 6-55 Failure of both PROFINET cables in the PROFINET ring at the primary CPU
Sequence of events
1. Both PROFINET cables in the PROFINET ring at the primary CPU fail. The redundant system
will not execute a primary-backup switchover. The redundant system will remain in the RUN-
Redundant system state.
2. The primary CPU can no longer access the IO devices in the PROFINET ring. The IO devices
will return to the substitute values.
3. The failure of both PROFINET cables affects the process, since the IO devices in the PROFINET
ring can no longer be reached from the primary CPU.
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