Commissioning
12.5 CPU memory reset
S7-1500R/H redundant system
420 System Manual, 01/2024, A5E41814787-AF
Procedure via the operating mode keys (R-CPUs as of article number 6ES7513-1RM03-0AB0,
6ES7515-2RN03-0AB0)
↔ Reset to factory settings
The procedure described below also corresponds to the procedure for resetting to factory
settings:
Key operation with inserted SIMATIC memory card: CPU executes a memory reset
Key operation without inserted SIMATIC memory card: CPU executes reset to factory
settings
To perform a memory reset of the CPU using the mode selector keys, follow these steps:
1. Press the STOP mode selector key.
Result: The STOP ACTIVE and RUN/STOP LED light up yellow.
2. Press the operating mode button STOP until the RUN/STOP LED lights up for the 2nd time
and remains continuously lit after three seconds. After this, release the button.
3. Press the STOP mode selector key again within the next three seconds.
Result: The CPU executes a memory reset.
For information on resetting the CPU to factory settings, refer to the section Reset CPU to
factory settings (Page 466).
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 a memory reset.
Procedure using STEP 7
Requirement: There is an online connection between the CPU ad PG/PC.
Proceed as follows for a CPU memory reset with STEP 7:
1. Open the "Online Tools" task card of the CPU.
2. Click "MRES" in the "CPU operator panel" pane.
3. Click "OK" in response to the confirmation prompt.
Result: The CPU executes a memory reset.
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