Siemens SIMATIC S7-400 Hardware And Installation Manual page 204

Assembling the M7-400
3. Press the connecting clip on its two 90 ends downward until it engages. Figure
8-11 shows a connecting clip in its final position.
4. Carry out steps 1 to 3 similarly on the bottom of the modules to be secured.
Figure 8-10
Figure 8-11
8-22
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Clip end bent
90
Connecting Clip
Securing the Modules with Connecting Clips (Schematic Diagram)
S7-400 and M7-400 Programmable Controllers, Installation Manual
Bent clip end
Fifth grid hole
C79000-G7076-C424-01