Siemens SIMATIC S7-1500 System Manual page 153

SIMATIC memory card
12.1 SIMATIC memory card - overview
Removing the SIMATIC memory card
Only remove the SIMATIC memory card in the POWER OFF or STOP operating modes of
the CPU. Ensure that no writing functions (e.g. loading/deleting a block) are active in STOP
mode, or were active in POWER OFF mode. For this purpose, disconnect the
communication connections.
If the SIMATIC memory card is removed during a write process, the following problems can
occur:
● The data contents of a file are incomplete
● The file is no longer readable, or no longer exists
● The entire data contents are defective
Removing the SIMATIC memory card from the CPU in STOP, STARTUP or RUN mode
triggers a re-evaluation of the SIMATIC memory card. The CPU hereby compares the
content of the configuration on the SIMATIC memory card with the backed-up retentive data.
If the backed-up retentive data matches the data of the configuration on the SIMATIC
memory card, the retentive data is retained. If the data differs, the CPU automatically
performs a memory reset (which means the retentive data is deleted) and then goes to
STOP.
Removing the SIMATIC memory card from Windows computers
If you are using the card in a commercially available card reader under Windows, use the
"Eject" function before you remove the card from the card reader. Otherwise data loss can
arise.
Deleting the contents of the SIMATIC memory card
You have the following options for deleting the contents of the SIMATIC memory card:
● delete files using Windows Explorer
● format with STEP 7
Note
If you format the card with Windows utilities, you will render the SIMATIC memory card
unusable as a storage medium for a CPU.
Deletion of files and folders is permitted, with the exception of the "__LOG__" and
"crdinfo.bin" system files. These are required by the CPU. If you delete these files, then you
will no longer be able to use the SIMATIC memory card with the CPU.
If the "__LOG__" and "crdinfo.bin" system files have been deleted, format the SIMATIC
memory card as described in the following section.
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S7-1500 Automation System
System Manual, 02/2014, A5E03461182-AB