Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
188 System Manual, 01/2024, A5E41814787-AF
6.4.7.4 Failure of the two PROFINET cables in the PROFINET ring on the backup CPU
Introduction
The following redundancy scenario describes the effects of a defect of both PROFINET cables
in the PROFINET ring at the backup CPU.
Redundancy scenario
Two fiber-optic cables (redundancy connections)
PROFINET cables (PROFINET ring) → interrupted
Figure 6-40 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.
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