Siemens SIMATIC S7-1500/ET 200MP System Manual page 321

Maintenance
14.6 Reset to factory settings
Procedure using the mode selector
Make sure that the CPU is in STOP operating state: The CPU display indicates the STOP
operating mode. The RUN/STOP LED lights up yellow.
Note
Reset to factory settings ↔ Memory reset
The procedure described below 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 lit (this takes three seconds). After
this, release the selector.
4. Within the next three seconds, switch the mode selector back to the MRES position, and
then back to STOP again.
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 yellow, then the CPU has been reset to
factory settings, and is in the STOP mode. The "Reset to factory settings" event is entered into
the diagnostics buffer.
Note
The IP address of the CPU is also deleted when the CPU is reset to the factory settings through
the mode selector.
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Automation system
System Manual, 01/2023, A5E03461182-AK