Siemens S7-400 installation manual Inserting a Memory Card, Memory Card as Load Memory

Commissioning

6.7Inserting a Memory Card

The Memory Card as Load Memory

You can insert a Memory Card into any S7-400 CPU. This card represents the load memory expansion 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	you should use a RAM card.
memory of the CPU,
want to store your user program	you should use a Flash card.
permanently on the memory card, even with
power removed (without backup or outside
the CPU),

Further information on the memory cards can be found in the CPU Manual, Chapter 1.

Automation System S7-400	Hardware and Installation	6-11
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