Siemens SIMATIC S7-1500 System Manual page 322

Maintenance
13.1 Replacing components of the S7-1500R/H redundant system
Requirements
• Read the information in the section Checking before replacing components (Page 319).
• The replacement CPU has the same article number and firmware version as the failed R/H-
CPU. It may be necessary to load an older firmware version onto the replacement CPU.
NOTE
CPUs S7-1500R with firmware version V3.0
CPUs S7-1500R with firmware version V3.0 have new article numbers.
Combined mode between old (6ES751x-xRx00-0AB0) and new article number (6ES751x-
xRx03-0AB0) is not possible.
• The replacement CPU has a SIMATIC memory card with sufficient storage capacity.
• The primary CPU has not disabled SYNCUP (default).
Procedure for replacing R/H-CPUs
Proceed as follows to replace an R/H-CPU in the redundant system:
1. Switch off the supply voltage to the failed R/H-CPU.
2. Remove the connector for the supply voltage.
3. Disconnect all PROFINET bus connectors. Then remove the bus connectors from the R/H-
CPU.
4. For H-CPUs only: Disconnect the redundancy connections (fiber-optic cables) at the H-CPU.
5. For H-CPUs only: Pull the synchronization modules out of the H-CPU.
6. Remove the failed R/H-CPU.
7. Install the replacement CPU with the SIMATIC memory card inserted and the mode
selector in the STOP position.
8. For H-CPUs only: Insert the synchronization modules in the replacement CPU.
9. For H-CPUs only: Insert the redundancy connections (fiber-optic cables) in the
synchronization modules.
10. Insert the PROFINET bus connectors into the R/H-CPU.
11. Push the connector for the supply voltage into the socket on the R/H-CPU.
12. Switch the supply voltage back on.
13. Check the pairing.
14. Start the replacement CPU.
Result
1. The replaced R/H-CPU executes SYNCUP.
2. The replaced R/H-CPU switches to the RUN-Redundant operating state and operates as
backup CPU.
322
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD