Siemens SIMATIC S7-1500 System Manual page 209

Commissioning
11.7 CPU memory reset
Procedure using the mode selector
Note
Memory reset ↔ Reset to factory settings
The procedure described below also corresponds to the procedure for resetting to factory
settings:
• 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
To perform a memory reset of the CPU using the mode selector, follow these steps:
1. Set the mode selector to the STOP position.
Result: The RUN/STOP LED lights up yellow.
2. Set the mode selector to the MRES position. Hold the selector 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 mode selector back to the MRES position, and
then back to STOP again.
Result: The CPU executes memory reset.
You can find information on resetting the CPU to factory settings in CPU reset to factory
settings (Page 251).
Procedure using STEP 7
To perform a memory reset of the CPU via STEP 7, follow these steps:
1. Open the "Online Tools" task card of the CPU.
2. Click the "MRES" button in the "CPU control panel" pane.
3. Click "OK" in response to the confirmation prompt.
Result: The CPU is set to STOP mode and performs memory reset.
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SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA