Siemens SIMATIC S7-400H System Manual page 68

Assembly of a CPU 41x–H
5.6 Using memory cards
FLASH card
If you use a FLASH card, there are two ways of loading the user program:
● Use the mode switch to set the CPU to STOP, insert the FLASH card into the CPU, and
● You download the user program to the FLASH card in offline mode on the programming
The FLASH card is a non-volatile memory, i.e. its data are retained when it is removed from
the CPU or your S7-400 is being operated without backup voltage (without a backup battery
in the power supply module or external backup voltage at the "EXT. BATT." input of the
CPU).
Automatic restart or cold restart without backup
If you operate your CPU without a backup battery, CPU memory reset followed by restart or
cold restart, as configured, will automatically be carried out after switch-on or voltage
recovery after power off. The user program must be available on the FLASH card and the
battery indicator switch on the power supply module may not be set to battery monitoring.
If battery monitoring is set, you must carry out a restart or cold restart either with the mode
switch or via a programming device after CPU switch on or voltage recovery following power
off. The absence of or a defective backup battery is reported as an external fault and the
LED EXTF lights up.
Downloading a user program
You can only download the full user program to a FLASH card.
Downloading additional user program elements
You can download further elements of the user program from the programming device to the
integrated load memory of the CPU. Note that the content of this integrated RAM will be
deleted if the CPU performs a memory reset, i.e. the load memory is updated with the user
program stored on the FLASH card after a memory reset.
What memory card capacity should I use?
The capacity of your memory card is determined by the scope of the user program.
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then download the user program to the FLASH card in
STEP 7 by selecting "Target system > Download user program to memory card".
device/programming adapter, and then insert the FLASH card into the CPU.
System Manual, 03/2012, A5E00267695-11
S7-400H