Application planning
3.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
61
Diagnostics
System state, operating states and error displays after primary-backup switchover:
●
Redundant system → RUN
-Solo system state
●
Primary CPU (previously backup CPU) → RUN operating state
–
MAINT LED → yellow light: The R/H system is not in the RUN
-Redundant system
state; no partner CPU found in the redundant system.
●
Backup CPU (previou
sly primary CPU) → failed
Note
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective CPU. You can find additional information on the procedure in the
section Replacing defective R/H CPUs (Page 260).
Summary of Contents for Simatic S7-1500H
Page 1: ......
