Application planning
6.5 Failure scenarios
S7-1500R/H redundant system
204 System Manual, 01/2024, A5E41814787-AF
Diagnostics
System state, operating states and error displays after the cable interruptions:
• Redundant system → RUN-Solo system state
• Primary CPU → RUN 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.
– ERROR LED → flashes red: One or more IO devices cannot be accessed.
• 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 PROFINET cables. You can find additional information on the procedure
in the section Replacing defective redundancy connections (Page 447).
6.5.3.2 Two cable interruptions in the PROFINET ring in S7-1500R within ≤ 1500 ms
Introduction
The following failure scenario describes the effects of two cable interruptions in the
PROFINET ring. In this failure scenario, the time between the two cable interruptions is
≤ 1500 ms.
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