Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
182 System Manual, 01/2024, A5E41814787-AF
Redundancy scenario
One fiber-optic cable (redundancy connection) → interrupted
PROFINET cable (PROFINET ring)
Figure 6-37 Failure of a redundancy connection
Sequence of events
1. One of the two redundancy connections (fiber-optic cables) is interrupted.
2. The system continues to exchange process data with the IO devices.
3. The redundancy of the system is restricted. The redundant system will remain in the RUN-
Redundant system state. The restriction has no effect on the process.
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