Siemens SIMATIC S7-1500 System Manual page 188

Diagnostics
System state, operating states and error displays after the failure of the redundancy
connections and PROFINET cable:
• 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
• Backup CPU → STOP operating state
– MAINT LED → yellow light: The H-system is not in the RUN-Redundant system state. No
Note
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective redundancy connections and the defective PROFINET cable. You can
find more information on the procedure in the following sections:
• Replacing defective redundancy connections (Page 447)
• Replacing defective PROFINET cables
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
partner CPU has been found in the H-system. The PROFINET ring is open (requirement:
Primary CPU is MRP Manager).
partner CPU has been found in the H-system.
Application planning
6.4 Redundancy scenarios
187