Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
185
Diagnostics
System state, operating states and error displays after the failure of both redundancy
connections:
• Redundant system → RUN-Solo system state
• Primary CPU → RUN operating state
– MAINT LED → yellow light: The H-system is not in the RUN-Redundant system state. No
partner CPU has been found in the H-system.
• Backup CPU → STOP operating state
– MAINT LED → yellow light: The H-system is not in the RUN-Redundant system state. No
partner CPU has been found in the H-system.
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective redundancy connections. You can find additional information on the
procedure in the section Replacing defective redundancy connections (Page 447).
6.4.7.3 Failure of both redundancy connections and the PROFINET cable in the PROFINET
ring
Introduction
The following redundancy scenario describes the effects of a defect in each of the two
redundancy connections and in the PROFINET cable in the PROFINET ring.
In this redundancy scenario, the time between the redundancy connection failures is
> 55 ms.
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