What type of memory card to use?
Whether you use a RAM card or a Flash card depends on your application.

If you ... then ...

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also want to be able to edit your program in RUN, use a RAM card

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want to keep a permanent backup of your user use a Flash card
program on the memory card when power is off,
i.e. without a backup battery or outside the CPU,

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You can find more info in SIMATIC Fault-tolerant Systems S7-400H (from page 55...). Be careful:Using memory cards in the CPUs 41x-H

Hope this helps.

regards