Siemens S7-400 - Inserting the Key in the CPU

Assembling the M7-400
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S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
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