Siemens SIMATIC S7-400 Hardware And Installation Manual page 162

Starting Up
Note
The connectors to accept the memory cards are coded (see Figure 6-3). Do not
apply force when fitting the memory cards.
Lightly press the guide supports out to remove the memory cards (see Figure
6-3).
Slot 1
Slot 2
Figure 6-2 Fitting Memory Cards in the CPUs
Memory card
Cutout
Guide support
Figure 6-3 Memory Card
6-20
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Copper flag
Polarity reversal
protection
Slots 1 and 2
S7-400 and M7-400 Programmable Controllers, Installation Manual
Cutout
Guide support
C79000-G7076-C424-01