Siemens SIMATIC S7-1500 System Manual page 178

Commissioning
10.6 CPU memory reset
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.
For information on resetting the CPU to factory settings, refer to the section Resetting the
CPU to factory settings (Page 218).
Procedure using the display
To navigate to the desired "Memory reset" menu command, select the following sequence of
menu commands and confirm after each selection with "OK".
● Settings → Reset → Memory reset
Result: The CPU executes memory reset.
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.
178
Automation system
System Manual, 09/2016, A5E03461182-AD