Failure Of A Communications Processor At The Primary Cpu - Siemens SIMATIC S7-1500 System Manual

Diagnostics
System state, operating states and error displays after the failure of the PROFINET cable:
• Redundant system → RUN-Redundant system state
• Primary CPU/Backup CPU → RUN-Redundant operating state
– MAINT LED → yellow light: No backup AR.
Note
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective PROFINET cable. You can find additional information on the procedure
in the section Replacing defective PROFINET cables (Page 451).
6.4.7.9

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
①
②
③
④
⑤
⑥
Figure 6-45
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
Primary CPU
Backup CPU
CP 1543-1 (at primary CPU) → failed
CP 1543-1 (at backup CPU)
PROFINET cable (PROFINET ring)
Two fiber-optic cables (redundancy connections)
S7-1500H failure of a CP 1543-1 at the primary CPU
Application planning
6.4 Redundancy scenarios
197