Siemens Simatic S7-400, Installation Manual, Page: 140 / 228

Commissioning
6-12
Automation System S7-400 Hardware and Installation
A5E00850741-01
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 6-3.
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 pressing the mode selector switch in
MRES position and then resetting it 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 6-3 Inserting a Memory Card in a CPU
Note
If you insert or remove the memory card with the controller switched on, the CPU
inidcates a memory reset request by the 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
performs an automatic memory reset after power on.