Commissioning
8.5 Memory reset
S7-1500 Automation System
108 System Manual, 01/2013, A5E03461182-01
Procedure using the operating mode switch
Note
Memory reset ↔ Reset to factory settings
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
Proceed as follows to reset the CPU memory using the mode selector switch:
1. Set the operating mode switch to the STOP position.
Result: The RUN/STOP LED lights up in yellow.
2. Set the operating mode switch 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 operating mode switch back to MRES position,
and then back to STOP again.
Result: The CPU executes memory reset.
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 using 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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