Memory concept
4.1 Memory areas and retentivity
CPU 31xC and CPU 31x, Technical Data
4-8 Manual, 01/2006 Edition, A5E00105475-06
4.1.5 Properties of the SIMATIC Micro Memory Card (MMC)
The SIMATIC Micro Memory Card (MMC) as memory module for the CPU
The memory module used on your CPU is a SIMATIC Micro Memory Card. You can use
MMCs as load memory or as a portable storage medium.
Note
The CPU requires the SIMATIC Micro Memory Card for operation.
The following data are stored on the SIMATIC Micro Memory Card.
• User programs (all blocks)
• Archives and recipes
• Configuration data (STEP 7 projects)
• Data for operating system update and backup
Note
You can either store user and configuration data or the operating system on the SIMATIC
Micro Memory Card.
Properties of the SIMATIC Micro Memory Card (MMC)
The SIMATIC Micro Memory Card ensures maintenance-free and retentive operation of
these CPUs.
Caution
Data on a SIMATIC Micro Memory Card can be corrupted if you remove the card while it is
being accessed by a write operation. In this case, you may have to delete the SIMATIC
Micro Memory Card on your PG, or format the card in the CPU. Never remove a SIMATIC
Micro Memory Card in RUN mode. Always remove it when power is off, or when the CPU is
in STOP state, and when the PG is not writing to the card. When the CPU is in STOP mode
and you cannot not determine whether or not a PG is writing to the card (e.g. load/delete
block), disconnect the communication lines.
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