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SIMATIC S7-400 / S7-400H / S7-400F /FH: Ram memory card, long; 2 Mb

Hello,
Normally I use CPU from 300 serie with memory card who not lost his memory
I have a 414-3 CPU and are confused with the memory card, conerning lost of memory when you loss the power.
I have installed a RAM memory card, long; 2 MB into the CPU.
How is this card behave, must i "BURN" the software to the EPROM each time I do a change so it not will be lost with a power loss etc ???
Are there differen type of memory card I can use for this CPU?
Thank you verry much for your inputs in this matter.

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