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

Commissioning
11.7 CPU memory reset
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 memory card: CPU executes reset to factory
settings
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Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ