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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
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Your CPU uses a SIMATIC Micro Memory Card (MMC) as a memory module. You
can use MMCs as load memory or as a portable storage medium.
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An MMC must be plugged in before you can use the CPU.
The following data is stored on MMC:
• User programs (all blocks)
• Archives and recipes
• Configuration data (STEP 7 projects)
• Data for an operating system update and backup
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On one MMC you can either store user and configuration data or the operating
system.
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The MMC ensure maintenance-free and retentive operation of these CPUs. The
chapter 0HPRU\&RQFHSWprovides more details about retentive operation.
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Data on a SIMATIC Micro Memory Card can be corrupted if you remove the card
durin
write access. In this case
ou mi
ht have to insert the MMC memor
in
our
PG to delete it, or you format the card in the CPU.
Never remove an MMC in RUN mode. Always remove when power is off or when
the CPU is in STOP state and when no PG performs a write access the card.
Disconnect the communication lines if you cannot safely exclude active write
access functions from the PG (e.g. load/delete function block).
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