Replacing Defective R/H-Cpus - Siemens SIMATIC S7-1500 System Manual

Procedure
To start the pairing, for example when redundancy connections are interrupted, follow these
steps:
1. Set the mode selector for the backup CPU to STOP.
2. S7-1500R: Repair the PROFINET cables in the PROFINET ring. Insert the PROFINET cables
into the R-CPU interfaces.
S7-1500H: Repair the fiber-optic cables and synchronization modules. Insert the fiber-
optic cables into the synchronization modules.
3. Check for successful pairing of the redundant system. Please note the information in
"Checking pairing state" above.
4. Set the mode selector for the backup CPU to RUN.
Result
The S7-1500R/H redundant system switches to the RUN-Redundant system state.
13.1.2

Replacing defective R/H-CPUs

Initial situation
One of the two R/H-CPUs has failed or the R/H-CPU is no longer working.
The S7‑1500R/H redundant system is in the RUN-Solo system state.
NOTE
Replacing defective HF-CPU with safety program
You can find the exact procedure in the SIMATIC Safety - Configuring and Programming
(https://support.industry.siemens.com/cs/ww/en/view/54110126) programming and
operating manual.
NOTE
Replacement part case R/H-CPU
Replacing a R/H-CPU in the replacement part scenario has an impact on the password for
protection of confidential configuration data. If you replace a defective R/H-CPU with a new
R/H-CPU, you must assign the previously valid password for the new R/H-CPU for the first
time.
For more information and rules for the replacement part scenario, please refer to the
Communication (https://support.industry.siemens.com/cs/ww/en/view/59192925) Function
Manual.
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
13.1 Replacing components of the S7-1500R/H redundant system
Maintenance
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