Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
197
Diagnostics
System state, operating states and error displays after the failure of the PROFINET cable:
• Redundant system → RUN-Redundant system state
• Primary CPU/Backup CPU → RUN-Redundant operating state
– MAINT LED → yellow light: No backup AR.
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective PROFINET cable. You can find additional information on the procedure
in the section Replacing defective PROFINET cables (Page 451).
6.4.7.9 Failure of a communications processor at the primary CPU
Introduction
The following redundancy scenario describes the effects of a defective CP 1543-1
communications processor at the primary CPU.
Redundancy scenario
CP 1543-1 (at primary CPU) → failed
CP 1543-1 (at backup CPU)
PROFINET cable (PROFINET ring)
Two fiber-optic cables (redundancy connections)
Figure 6-45 S7-1500H failure of a CP 1543-1 at the primary CPU
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