Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
184 System Manual, 01/2024, A5E41814787-AF
Redundancy scenario
Two fiber-optic cables (redundancy connections) → interrupted
PROFINET cable (PROFINET ring)
Figure 6-38 Failure of both redundancy connections (> 55 ms apart)
Sequence of events
1. The two redundancy connections (fiber-optic cables) are interrupted > 55 ms apart.
2. The redundant system switches to the RUN-Solo system state. The primary CPU remains in
the RUN operating state. The backup CPU switches to the STOP operating state.
3. The primary CPU continues to exchange process data with the IO devices.
4. The redundancy of the system is restricted. The restriction has no impact on the process.
If another system component or another network segment fails, this can result in the failure
of the S7-1500R/H redundant system. You can find additional information in the section
Failure scenarios (Page 198).
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