Siemens Simatic S7-1500 / ET 200MP - Automatic Memory Reset; Manual Memory Reset

Commissioning
12.6 CPU memory reset
Automation system
272 System Manual, 01/2023, A5E03461182-AK
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.
You can find additiona
l information on the password for protection of confidential
configuration data in the Communication
(https://support.industry.siemens.com/cs/ww/de/view/59192925/en) function manual.
12.6.1 Automatic memory reset
Possible causes of automatic memory reset
The CPU executes an automatic memory reset if an error occurs that prevents normal further
processing.
Examples of such errors:
• User program is too large and cannot be loaded to the work memory in full.
• The project data on the SIMATIC memory card are damaged, for example because a file
was deleted.
• You remove or insert the SIMATIC memory card. The backed-up retentive data differs in
structure from the data in the configuration on the SIMATIC memory card.
12.6.2 Manual memory reset
Reason for manual memory reset
Memory reset is required to reset the CPU to the "original state".
CPU memory reset
Three options are available for performing a CPU memory reset:
• Using the mode selector switch / mode selector keys
• Using the display
• Using STEP 7