5.4.2 Failure of the primary CPU
Introduction
The following redundancy scenario describes the effects of a defective primary CPU using the
example of a PROFINET ring.
Redundancy scenario
① Primary CPU → failed
② Backup CPU → becomes new primary CPU
③ PROFINET cable (redundancy connections, PROFINET ring)
④ IO device ET 200MP (with system redundancy S2)
⑤ IO device ET 200SP (with system redundancy S2)
⑥ Switch
⑦ Standard IO device ET200SP
Figure 5-24Failure of the primary CPU (using S7-1500R as an example)
Sequence of events
1.
The primary CPU of the redundant system fails in the RUN-Redundant system state.
2.
The redundant system switches to the backup CPU. The backup CPU becomes the new
primary CPU. The redundant system switches to the RUN-Solo system state. You can find
additional information on the RUN-Solo system state in the section Operating and system
states (Page 263).
103
Application planning
5.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
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