Siemens SIMATIC S7-400 Hardware And Installation Manual page 232

Assembling the M7-400
6. Loosen the mounting screws of all modules in the module assembly.
Figure 8-23 shows the locations of mounting screws on a module.
Figure 8-23 Unscrewing Modules
7. Ensure that all the mounting screws of the module assembly are undone.
8. Swing the module assembly forward out of the bus connectors and lift it upward
and out of the guides of the rack (Figure 8-24).
8-50
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S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01