Siemens ET 7Y Series Especificaciones Pagina 118

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Functions of the IM 151-7 CPU
8-6
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
8.3 SIMATIC Micro Memory Card
Micro Memory Card
A SIMATIC Micro Memory Card (MMC) is used as a memory module for the
IM 151-7 CPU. The MMC can be used as a load memory and portable data carrier.
It is an essential requirement for operating the IM 151-7 CPU. The following data is
stored on the MMC:
User program (all blocks)
Archives and recipes
Configuration data (STEP 7 projects)
Data for an operating system update, operating system backup
Note
On one MMC you can store either user and configuration data or the operating
system.
Copy protection
The MMC has an internal serial number for the purpose of providing MMC copy
protection at the user level. You can read out this serial number from the SZL parts
list, 011C
H
Index 8, using the SFC 51 RDSYSST.
For example, you can program a STOP command in a know-how protected block
for the event that the set and actual serial number of the MMC do not match.
More detailed information can be found in the SZL parts list in the instructions list
or in the System and Standard Functions manual.
Features
The SIMATIC micro memory card ensures zero maintenance and retentivity for the
IM 151-7 CPU. More detailed information can be found in Section 8.4.
!
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.
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