Siemens SIMATIC ET 200S Manual page 130

Functions of the IM 151-7 CPU
Removing/inserting the MMC
The IM 151-7 CPU cannot run if there is no MMC inserted in the IM 151-7 CPU (no
load memory available). Practical operation is only possible if an MMC has been
inserted and a memory reset has been performed.
Removal and insertion of an MMC is detected by the IM 151-7 CPU in all operating
modes.
Removing:
1. The IM 151-7 CPU must be in the STOP mode.
2. The PD must not be performing any write access operations (e.g. loading
blocks)
3. When the MMC is removed, the IM 151-7 CPU requests a memory reset
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 IM 151-7 CPU.
Never remove the MMC in RUN mode; it should only be removed when the
IM 151-7 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.
Inserting:
The MMC with the appropriate user program is inserted as follows:
1. Insert the MMC
2. The IM 151-7 CPU requests a memory reset
3. Acknowledge the memory reset
If the IM 151-7 CPU requests a memory reset again owing to an incorrect MMC
or an MMC with a firmware update being inserted, proceed as described in
Section 8.3 under Special Measure.
4. Start the IM 151-7 CPU
Warning
!
Make sure that the MMC to be inserted contains the user program appropriate for
the IM 151-7 CPU (for the system). An incorrect user program can have serious
effects on processing.
8-18
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04