Maintenance
14.1 Replacing components of the S7-1500R/H redundant system
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
447
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.
14.1.3 Replacing defective redundancy connections
Introduction
This section describes the following replacement scenarios:
S7-1500R:
• Replace defective PROFINET cable with S7-1500R.
The PROFINET ring has been interrupted at any given point. You can find additional
information in the section Replacing defective PROFINET cables (Page 451).
• Replace two defective PROFINET cables with S7-1500R.
The PROFINET ring has been interrupted at two points.
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