Specific Redundancy Scenarios For S7-1500R; Failure Of A Communications Processor At The Primary Cpu - Siemens SIMATIC S7-1500 System Manual

Application planning
6.4 Redundancy scenarios
Diagnostics
System state, operating states, and error displays after failure of the primary CPU:
• Redundant system → RUN-Solo system state
• Primary CPU → failed
• Backup CPU → RUN operating state
– MAINT LED → lights up yellow: The R/H system is not in the RUN-Redundant system
Solution
Replace the defective CPU. You can find more information on the procedure in the Replacing
defective R/H CPUs (Page 446) section.
6.4.6

Specific redundancy scenarios for S7-1500R

6.4.6.1

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
Figure 6-36
180
state. No partner CPU was found in the redundant system. The
PROFINET ring is open.
Primary CPU
Backup CPU
CP 1543-1 (at primary CPU) → failed
CP 1543-1 (at backup CPU)
PROFINET cable (redundancy connections, PROFINET ring)
S7-1500R failure of a CP 1543-1 at the primary CPU
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF