Maintenance
14.5 Resetting CPUs to factory settings
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
467
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.
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.
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
Perform a reset to factory settings as follows:
1. Press the STOP mode selector key.
Result: The STOP-ACTIVE and RUN/STOP LED light up yellow.
2. Press the STOP operating mode button until the RUN/STOP LED lights up for the 2nd time
and remains continuously lit (this takes three seconds). After this, release the button.
3. Press the STOP mode selector key again within the next three seconds.
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