Siemens Simatic S7-400

Wiring the S7-400
4-31
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
Plugging In the Power Supply Connector
You can only plug in the connector when the power supply module is installed
(lower mounting screw tightened).
!
Caution
An AC power supply module can be damaged.
If you set the voltage selector switch of an AC power supply module to 120 V and
connect the power supply module to a 230 V supply, a fault may develop on the
power supply module. In this case the warranty will be void.
Set the voltage selector switch of an AC power supply module to the available line
voltage.
To plug the wired power supply connector into the power supply module, follow the
steps outlined below:
1. Open the cover of the power supply module.
2. Insert the power supply connector into the guide groove in the module housing.
3. Slide the power supply connector into the power supply module as far as it will
travel.
4. Close the cover of the power supply module.
The following figure shows how to plug the power supply connector into the power
supply module.
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