Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
186 System Manual, 01/2024, A5E41814787-AF
Redundancy scenario
Two fiber-optic cables (redundancy connections) → interrupted
PROFINET cable (PROFINET ring)
PROFINET cable (PROFINET ring) → interrupted
Figure 6-39 Failure of both redundancy connections and a PROFINET cable in the PROFINET ring
Sequence of events
1. Both redundancy connections (fiber-optic cables) fail in the redundant system. The time
between the failures is > 55 ms.
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. A defective PROFINET cable also interrupts the PROFINET ring.
4. The redundant system accesses all IO devices in the PROFINET ring again over the remaining
PROFINET cables.
5. The redundancy of the system is restricted. The restrictions have no effect on the process.
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