Siemens S7-400 - Inserting the Key in the CPU

Installing the S7-400
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S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Inserting the Keyswitch
You can insert the key in the CPU in the STOP position of the switch. You can
remove the key in the STOP or RUN settings.
Figure 2-8 Inserting the Key in the CPU