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

Maintenance
11.1 Replacing components of the S7-1500R/H redundant system
11.1.2

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.
Requirements
● Read the information in the section Checking before replacing components (Page 257).
● The replacement CPU has the same article number and firmware version as the failed
R/H-CPU.
● The replacement CPU has a SIMATIC memory card with the correct 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 the bus connector for the PROFINET ring. Then remove the bus connector
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 cables in 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.Switch the replacement CPU to the RUN operating state.
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.
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S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA