Assembly of a CPU 41x–H
5.6 Using memory cards
S7-400H
System Manual, 03/2012, A5E00267695-11
67
5.6 Using memory cards
Types of memory cards for the S7–400
Two types of memory cards are used for S7–400H:
● RAM cards
● FLASH cards
What type of memory card should I use?
Whether you use a RAM card or a FLASH card depends on your application.
Table 5- 5 Types of memory card
If you ... then ...
want to be able to edit your program in RUN
mode,
use a RAM card
want to keep a permanent backup of your user
program on the memory card, even when power
is off, i.e. without backup or outside the CPU,
use a FLASH card
RAM card
Insert the RAM card to load the user program in the CPU. Load the user program in STEP 7
by selecting "Target system > Download".
You can load the entire user program or individual elements such as FBs, FCs, OBs, DBs, or
SDBs in the load memory in STOP or RUN mode.
When you remove the RAM card from the CPU, the information stored on it will be lost. The
RAM card is not equipped with an integrated backup battery.
If the power supply is equipped with an operational backup battery, or the CPU is supplied
with an external backup voltage at the "EXT. BATT." socket, the RAM card memory contents
are retained when power is switched off, provided the RAM card remains inserted in the
CPU and the CPU remains inserted in the rack.
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