Starting Up
6-11
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
6.7 Inserting a Memory Card
The Memory Card as Load Memory
You can insert a memory card in all CPUs of the S7-400. It is the load memory of
the CPU. Depending on the type of memory card, the user program is retained on
the memory card even when power is removed.
What Type of Memory Card Should You Use?
There are two types of memory card: RAM cards and Flash cards.
Whether you use a RAM card or a Flash card depends on how you intend to use
the memory card.
If You ... ...Then
only intend to expand the integrated load
memory of the CPU,
you should use a RAM card.
want to store your user program
permanently on the memory card, even with
power removed (without backup or outside
the CPU),
you should use a Flash card.
Further information on the memory cards can be found in the
Reference Manual
,
Chapter 8.
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