Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
180 System Manual, 01/2024, A5E41814787-AF
Diagnostics
System state, operating states, and error displays after failure of the primary CPU:
• Redundant system → RUN-Solo system state
• Primary CPU → failed
• Backup CPU → RUN operating state
– MAINT LED → lights up yellow: The R/H system is not in the RUN-Redundant system
state. No partner CPU was found in the redundant system. The
PROFINET ring is open.
Solution
Replace the defective CPU. You can find more information on the procedure in the Replacing
defective R/H CPUs (Page 446) section.
6.4.6 Specific redundancy scenarios for S7-1500R
6.4.6.1 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 (redundancy connections, PROFINET ring)
Figure 6-36 S7-1500R failure of a CP 1543-1 at the primary CPU
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