Application planning
6.5 Failure scenarios
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
211
Failure scenario
Two fiber-optic cables (redundancy connections) → interrupted
PROFINET cable (PROFINET ring)
Figure 6-53 Failure of both redundancy connections
Sequence of events
1. The two redundancy connections (fiber-optic cables) are interrupted ≤ 55 ms apart.
2. The redundant system switches to an undefined system state: The primary CPU remains in
the RUN operating state. The backup CPU becomes the primary CPU and remains in RUN
operating state.
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