Replacing A Defective System Power/Load Current Supply - Siemens SIMATIC S7-1500 System Manual

Result
1. The redundant system runs SYNCUP. SYNCUP transfers the project data from the primary to
the backup CPU.
2. The CPU switches to the RUN-Redundant operating state and operates as backup CPU. The
redundant system is in the RUN-Redundant system state again.
Reference
If there is not enough memory space on a SIMATIC memory card, the card can be replaced
during operation. You will find the procedure, the response of the redundant system and
other information on the SIMATIC memory card in the function manual Structure and use of
the CPU memory (https://support.industry.siemens.com/cs/ww/en/view/59193101).
14.1.6

Replacing a defective system power/load current supply

Initial situation
A system power/load current supply PS/PM has failed.
The S7-1500R/H redundant system is in the RUN-Solo system state.
Requirement
Read the information in the section Checking before replacing components (Page 443).
Procedure
Follow these steps to replace a defective PS/PM:
1. Switch off the mains supply (24 V DC or 230 V AC).
2. Replace the defective PS/PM.
3. Switch the mains supply back on.
4. Switch on the replaced PS/PM.
Result
1. The CPU with the replaced PS/PM runs SYNCUP. Requirement: The CPU mode selector is in
RUN.
2. The CPU switches to the RUN-Redundant operating state and operates as backup CPU. The
redundant system is in the RUN-Redundant system state again.
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
14.1 Replacing components of the S7-1500R/H redundant system
Maintenance
453