Siemens SIMATIC S7-400 Hardware And Installation Manual page 234

Assembling the M7-400
10.Remove the connecting clips, top and bottom, from the module to be replaced
(as shown in Figure 8-26).
Figure 8-26
11. Carefully withdraw the adjacent modules from the module to be replaced. The
modules to be separated should be held above the bus connector and pulled
apart at the side walls of the modules, so that the ISA bus connection is
disconnected (Figure 8-27).
Warning
!
The connector pins can be damaged.
If you misalign the modules when pulling them apart, the connector pins may be
damaged.
Pull the modules apart carefully without misaligning them.
8-52
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Removing the Connecting Clips from the Module to be Replaced
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01