Assembling the M7-400
8-27
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
8.4.8 Inserting/Removing a Memory Card
Purpose of the Memory Card
You can do the following with a memory card:
Store the operating system, user programs, and data (similarly to using a floppy
disk),
Transport the programs and data stored on the memory card,
Retain the programs and data, even during Power Off.
Inserting/Removing the Memory Card
A memory card should only be inserted or removed when no access to the
memory card is taking place, meaning the “SD” indicator on the CPU must be OFF.
Figure 8-15 shows how to insert a memory card in a CPU.
!
Warning
Data can be lost by inserting and removing the memory card.
If a write operation onto the memory card is taking place during insertion or
removal of the card, data consistency cannot be guaranteed.
If you are not sure whether write operations onto the memory card are taking
place, only change it with power removed.
Figure 8-15 Inserting a Memory Card in a CPU
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