Siemens SIMATIC S7-1500 System Manual page 340

Maintenance
13.5 Resetting CPUs 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.
Result: The CPU executes a "Reset to factory settings", during which time the RUN/STOP LED
flashes yellow. When the STOP-ACTIVE and RUN/STOP LED light up yellow, then the CPU has
been reset to factory settings, and is in the STOP mode. The "Reset to factory settings" event
is entered in the diagnostics buffer.
NOTE
Resetting the CPU to the factory settings via the operating mode buttons also deletes the IP
address of the CPU and resets the redundancy ID to 1.
Procedure using the display
Make sure that the CPU is in STOP operating state: The CPU indicates the STOP operating
state. The RUN/STOP LED lights up yellow.
1. Wait until the RUN/STOP LED stops flashing.
2. To navigate to the required "Factory settings" menu command, select the following
sequence of menu commands and confirm each selection with "OK".
– Settings → Reset → Factory settings
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.
Procedure using STEP 7
Proceed as follows to reset a CPU to factory settings with STEP 7:
Make sure that there is an online connection to the CPU.
1. Open the Online and Diagnostics view of the CPU.
2. In the "Functions" folder, select the "Reset to factory settings" group.
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD