Automatic Memory Reset; Manual Memory Reset - Siemens SIMATIC S7-1500 System Manual

Commissioning
13.7 CPU memory reset
Memory object
Time of day
Operating mode of the CPU: RUN/STOP
Note
Password for protection of confidential configuration data
The password for protection of confidential configuration data is retained after a memory
reset of the CPU. The password is only deleted when the "Delete password for protection of
confidential PLC configuration data" option is set in STEP 7.
You can find additional information on the password for protection of confidential
configuration data in the Communication function manual
(https://support.industry.siemens.com/cs/ww/en/view/59192925).
13.7.1

Automatic memory reset

Possible cause of automatic memory reset
The CPU executes an automatic memory reset if an error occurs that prevents normal further
processing.
Causes for such errors can be:
• User program is too large, and can't be completely loaded into work memory.
• The project data on the SIMATIC memory card are damaged, for example because a file
was deleted.
• If you remove or insert the SIMATIC memory card and the backed-up retentive data differs
in structure from that of the configuration on the SIMATIC memory card.
13.7.2

Manual memory reset

Reason for manual memory reset
CPU memory reset is required to reset the CPU to its "original state".
CPU memory reset
CPU memory reset is possible:
• Using the mode selector
• Using STEP 7
282
Contents
Retained
The CPUs retain the STOP state.
SIMATIC Drive Controller
System Manual, 11/2023, A5E46600094-AD