Redundancy scenario
① Primary CPU
② Backup CPU
③ One fiber-optic cable (redundancy connection) → interrupted
④ IO device ET 200SP
⑤ IO device ET 200MP
⑥ PROFINET cable (PROFINET ring)
Figure 5-27Failure 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.
109
Application planning
5.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
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