Maintenance
14.1 Replacing components of the S7-1500R/H redundant system
S7-1500R/H redundant system
446 System Manual, 01/2024, A5E41814787-AF
14.1.2 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.
-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
Replacement part case R/H
-CPU
-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
-CPU, you must assign the previously valid password for the new R/H-CPU for the first
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
Requirements
• Read the information in the section Checking before replacing components (Page 443).
• 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.
-1500R with firmware version V3.0
-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).
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