Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
179
6.4.5 Failure of the primary CPU with communications processor
Introduction
The following redundancy scenario describes the effects of a defective primary CPU with
communications processor CP 1543-1.
Redundancy scenario
CP 1543-1 (at primary CPU)
CP 1543-1 (at backup CPU)
PROFINET cable (redundancy connections, PROFINET ring)
Figure 6-35 S7-1500R failure of the primary CPU with CP 1543-1
Sequence
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.
3. The connection to Industrial Ethernet is maintained via the assigned W1 system IP address.
4. The redundancy of the system is restricted. The connection to Industrial Ethernet is
interrupted for a short time. This restriction has no effect on the process.
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