Functions of the IM 151-7 CPU
8-25
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
MMC access
Note
Active system functions SFC 82 to 84 (current access to the MMC) have a major
influence on PD functions (e.g. status block, status variable, download block,
upload block, open block). Their performance is typically 10 times lower
(compared to non-active system functions).
To prevent data loss, never exceed the maximum number of erase/write
operations of an MMC. Refer also to Section 8.3.
!
Caution
The module content of a SIMATIC micro memory card can be corrupted if the card
is removed while a write operation is being performed. The MMC must then be
erased at the PD or formatted in the CPU.
Never remove the MMC in RUN mode; it should only be removed when the CPU is
in the POWER OFF or STOP mode and only if the PD is not currently performing
a write access operation. If in the STOP mode you are not sure whether or not the
PD is currently performing a write access operation (e.g. loading/erasing a block),
unplug the communication connections beforehand.
8.4.5 Storing/download entire projects on/from Micro Memory Cards
You will find a detailed description of these functions in the Online Help for STEP 7.
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