Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
181
Sequence
1. The CP 1543-1 at the primary CPU fails.
2. The primary CPU switches to the STOP operating state.
3. The redundant system switches to the backup CPU. The backup CPU becomes the new
primary CPU.
4. The connection to Industrial Ethernet is maintained via the assigned W1 system IP address.
5. 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.
Diagnostics
System state, operating states, and error displays after the failure of the communications
processor CP at the primary CPU:
• Redundant system → RUN-Solo system state
• Primary CPU → failed
• Backup CPU → RUN operating state
– MAINT LED → lights up yellow: The R-system is not in the RUN-Redundant system state.
Solution
Replace the defective CP 1543-1. You can find more information on the procedure in the
Replacing a defective communications processor (Page 454) section.
6.4.7 Specific redundancy scenarios for S7-1500H
6.4.7.1 Failure of a redundancy connection in S7-1500H
Introduction
The following redundancy scenario describes the effects of a defective redundancy
connection on S7-1500H using the example of a PROFINET ring.
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