Application planning
6.5 Failure scenarios
S7-1500R/H redundant system
224 System Manual, 01/2024, A5E41814787-AF
Diagnostics
System state, operating states and error displays after the failure of both PROFINET cables:
• Redundant system → RUN-Redundant system state
• Primary CPU/Backup CPU → RUN-Redundant operating state
– MAINT LED → yellow light: No backup AR.
– ERROR LED → flashes red: One or more IO devices have failed.
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective PROFINET cables. You can find additional information on the procedure
in the section Replacing defective PROFINET cables.
6.5.4.8 Failure of the communications processor at the primary CPU with failure of the
backup CPU
Introduction
The following redundancy scenario describes the effects of a defective CP 1543-1
communications processor at the primary CPU with failure of the backup CPU.
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