Manual Memory Reset - Siemens SIMATIC S7-1500 System Manual

Commissioning
10.6 CPU memory reset
10.6.2

Manual memory reset

Reason for manual memory reset
Memory reset is required to reset the CPU to its "original state".
CPU memory reset
There are three options for performing a CPU memory reset:
● Using the mode selector
● Using the display
● Using STEP 7
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.
For information on resetting the CPU to factory settings, refer to the chapter Reset CPU to
factory settings (Page 193).
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.
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Automation system
System Manual, 12/2014, A5E03461182-AC