Failure scenario
① Primary CPU
② Backup CPU
③ Two fiber-optic cables (redundancy connections)
④ PROFINET cable (PROFINET ring 1)
⑤ PROFINET cable (PROFINET ring 2)
⑥ PROFINET lines → interrupted
⑦ IO device ET 200SPHA
⑧ IO device ET 200SP
Figure 5-32Failure of the two PROFINET lines in PROFINET ring 1 to the primary CPU.
Sequence of events
1.
Both PROFINET lines in PROFINET ring 1 on the primary CPU fail. The redundant system
will not execute a primary-backup switchover. The redundant system will remain in the
RUN-Redundant system state.
2.
The redundant system selects an alternative connection over the backup CPU and the
PROFINET ring 2. This allows the redundant system to reach the R1 devices again.
3.
The redundancy of the system is restricted. The restriction has no effect on the process. If
another system component fails, the S7-1500R/H redundant system can fail as a result.
119
Application planning
5.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
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