Siemens SIMATIC ET 200SP - Automatic Memory Reset; Manual Memory Reset

Commissioning
11.7 CPU memory reset
Distributed I/O system
214 System Manual, 09/2019, A5E03576849-AJ
11.7.1 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.
Causes of such errors are:
● User program is too large, and cannot be completely loaded into work memory.
● The project data on the SIMATIC memory card is corrupt, 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.
11.7.2 Manual memory reset
Reason for a manual memory reset
CPU memory reset is required to reset the CPU to its "original state".
CPU memory reset
Two options are available for performing a CPU memory reset:
● Using the mode selector
● 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 mem
ory card: CPU executes reset to factory
settings