Siemens SIMATIC S7-400 Hardware And Installation Manual page 208

Assembling the M7-400
Inserting the Mode Selector Switch
Figure 8-14 shows how to insert the key in the CPU at the STOP position of the
switch. You can remove the key at the STOP or RUN settings.
Figure 8-14 Inserting the Key in the CPU
8-26
www.gkbpx.com
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01