Failure scenario
① Primary CPU
② Backup CPU
③ Two fiber-optic cables (redundancy connections) → interrupted
④ IO device ET 200SP
⑤ IO device ET 200MP
⑥ PROFINET cable (PROFINET ring)
Figure 5-41Failure of both redundancy connections
Sequence of events
1.
The two redundancy connections (fiber-optic cables) are interrupted ≤55ms apart.
2.
The redundant system switches to an undefined system state: The primary CPU remains in
the RUN operating state. The backup CPU becomes the primary CPU and remains in RUN
operating state.
3.
The two primary CPUs continue to exchange process data with the PROFINET devices.
135
Application planning
5.5 Failure scenarios
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
To Next Page
Loading...
