Redundancy scenario
① Primary CPU (S7-1500H)
② Backup CPU (S7-1500H)
③ Two fiber-optic cables (redundancy connections) → interrupted
④ IO device ET 200MP
⑤ IO device ET 200SP
⑥ PROFINET cable (PROFINET ring)
Figure 5-28Failure of both redundancy connections (>55ms apart)
Sequence of events
1.
The two redundancy connections (fiber-optic cables) are interrupted >55ms 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 124).
111
Application planning
5.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
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