Siemens SIMATIC S7-1500 System Manual page 141

Maintenance
10.5 Resetting the CPU to factory settings
Procedure using the operating mode switch
Make sure that there is no SIMATIC memory card in the CPU and that the CPU is in STOP
mode (the display of the CPU shows the STOP mode or RUN/STOP LED lights up yellow).
Note
Reset to factory settings ↔ Memory reset
The selector operation described below also reflects the procedure for a memory reset:
• Selector operation with inserted SIMATIC memory card: Memory reset is executed
• Selector operation without inserted SIMATIC memory card: Reset to factory settings is
executed
Perform a reset to factory settings, when there is no SIMATIC memory card inserted, as
follows:
1. Set the operating mode switch to the STOP position.
Result: The RUN/STOP LED lights up yellow.
2. Set the operating mode switch to the MRES position. Hold the operating mode switch in
this position until the RUN/STOP LED lights up for the 2nd time and remains continuously
lit (this takes three seconds). After this, release the selector.
3. Within the next three seconds, switch the operating mode switch 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 operating mode switch.
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S7-1500 Automation System
System Manual, 02/2014, A5E03461182-AB