Siemens Simantic ET200SP - Automatic Memory Reset

Commissioning
10.7 CPU memory reset
Distributed I/O system
218 System Manual, 12/2016, A5E03576849-AG
Result after memory reset
The following table provides an overview of the contents of the memory objects after
memory reset.
Memory object
Content
Actual values of the data blocks, instance data blocks
Initialized
Bit memory, timers and counters Initialized
Retentive tags from technology objects
(for example, adjustment values of absolute encoders)*
Retained
Diagnostics buffer entries (retentive area) Retained
Diagnostics buffer entries (non-retentive area)
Initialized
IP address
Retained
Counter readings of the runtime meters
Retained
Time of day
Retained
* The retentive tags from technology objects are retained but the content of specific tags is partly re
-
initialized.
10.7.1
Automatic memory reset
Possible cause of an 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 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.