Siemens SIMATIC S7-1500 System Manual page 339

Procedure using the mode selector (R/H CPUs with article numbers 6ES7513-1RL00-0AB0,
6ES7515-2RM00-0AB0, 6ES7517-3HP00-0AB0, 6ES7518-4JP00-0AB0)
Make sure that the CPU is in STOP operating state: The CPU display indicates the STOP
operating state. The RUN/STOP LED lights up yellow.
NOTE
Reset to factory settings ↔ Memory reset
The procedure described below also corresponds to the procedure for a memory reset:
• Selector operation with inserted SIMATIC memory card: CPU executes a memory reset
• Selector operation without inserted SIMATIC memory card: CPU executes reset to factory
settings
Restore the factory settings of the CPU as follows:
1. Set the mode selector to the STOP position.
Result: The RUN/STOP LED lights up yellow.
2. Remove the SIMATIC memory card from the CPU. Wait until the RUN/STOP LED stops
flashing.
3. Set the mode selector to the MRES position. Hold the mode selector in this position until
the RUN/STOP LED lights up for the second time and remains continuously lit after 3
seconds. Then release the mode selector.
4. Within the next three seconds, switch the mode selector back to the MRES position and
then back to STOP.
Result: The CPU executes a "Reset to factory settings", during which time the RUN/STOP LED
flashes yellow. When the RUN/STOP LED lights up in yellow, the CPU has been reset to factory
settings and is in the STOP operating state. The "Reset to factory settings" event is entered in
the diagnostics buffer.
NOTE
Resetting the CPU to the factory settings with the mode selector also deletes the IP address of
the CPU and resets the redundancy ID to 1.
Procedure via the operating mode keys (R-CPUs as of article number 6ES7513-1RM03-0AB0,
6ES7515-2RN03-0AB0)
Make sure that the CPU is in STOP operating state: The CPU display indicates the STOP
operating state. The RUN/STOP LED lights up yellow.
NOTE
Reset to factory settings ↔ Memory reset
The procedure described below also corresponds to the procedure for a memory reset:
• Key operation with inserted SIMATIC memory card: CPU executes a memory reset
• Key operation without inserted SIMATIC memory card: CPU executes reset to factory
settings
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
13.5 Resetting CPUs to factory settings
Maintenance
339