Application planning
6.5 Failure scenarios
S7-1500R/H redundant system
208 System Manual, 01/2024, A5E41814787-AF
Diagnostics
System state, operating states and error displays after the failure of the IO device in the
PROFINET-Ring and the STOP of Backup CPU:
• Redundant system → STOP system state
• Primary CPU → failed
• Backup CPU → STOP operating state
– MAINT LED → yellow light: The R-system is not in the RUN-Redundant system state. No
partner CPU has been found in the R-system. The PROFINET ring is open.
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective IO device and the defective primary CPU. You can find additional
information on the procedure in the sections Replacing defective R/H CPUs (Page 446) and
Replacing defective I/O devices/switches (Page 455).
Proceed as follows if you have ensured that the CPU is still working in the STOP operating
state and can access all important IO devices:
Replace the defective IO device.
Switch the CPU from STOP operating state to the RUN operating state.
Replace the defective CPU. Switch the new CPU to the RUN operating state.
6.5.3.4 Failure of the backup CPU and failure of the CP communications processor at the
primary CPU
Introduction
The following failure scenario describes the effects of failure of the backup CPU and failure of
the CP 1543-1 communications processor at the primary CPU.
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