Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
175
6.4.3 Failure of the backup CPU
Introduction
The following redundancy scenario describes the effects of a defective backup CPU using the
example of a PROFINET ring.
Redundancy scenario
PROFINET cable (redundancy connections, PROFINET ring)
Figure 6-33 Failure of the backup CPU (using S7-1500R as an example)
Sequence of events
1. The backup CPU of the redundant system fails in the RUN-Redundant system state.
2. 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 380).
3. The primary CPU continues to exchange process data with the IO devices (and standard 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 198).
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