Siemens SIMATIC S7-400 Hardware And Installation Manual page 154

Starting Up
Inserting a Memory Card
To insert a memory card, follow the steps outlined below:
1. Set the mode selector switch on the CPU to STOP.
2. Insert the memory card in the submodule slot of the CPU and push the memory
card in as far as it will go.
Note the position of the marker dot. You can only insert the memory card in the
card slot in the direction shown in Figure 6-1.
Result: The CPU requests a memory reset by slow flashing of the STOP LED
at 0.5 Hz.
3. Perform a memory reset on the CPU by turning the mode switch to the MRES
setting and back again to STOP.
Result:The STOP LED flashes for at least 3 seconds at 2 Hz (reset is being
executed) and then remains lit.
Marker dot
Figure 6-1
Note
If you insert or remove the memory card with the controller switched
on, the CPU requests a memory reset by slow flashing of the STOP
indicator at 0.5 Hz.
If you insert or remove the memory card with the controller switched
off, the CPU will execute an automatic reset after power on.
6-12
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Inserting a Memory Card in a CPU
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01