Siemens SIMATIC PC 670 Equipment Manual page 32

Computing unit
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Starting Up the Computing Unit
The AC power supply of the computing unit is designed for 120/230/240 V mains
supplies.
The power supply has a wide range input. There is no need to adjust the voltage
range.
The DC power supply of the computing unit is designed for 24 V mains supplies.
One of these power supply is installed according to selection.
Connecting and switching on the computing unit
Before connecting computing unit to the mains, connect the front panels ready for
operation.
1. Plug the connection cables into the corresponding sockets on the interface side
of the computing unit (refer to "Panel PC 670/870 Computing Unit" equipment
manual).
2. Once the peripheral devices have been connected, the device is ready for
mains operation. Connect your device to the mains supply. The computing unit
is now operating.
Switching the computing unit off
Before switching the unit off, shut down the operating system in order to prevent
loss of data. The computing unit has no power switch and is disconnected from the
mains supply by unplugging the power plug.
Notice
When working using Windows, always use Start > Shut Down in the taskbar to
switch the unit off.
2-8
Panel PC 670 Computing Unit, Equipment Manual
Release 04/02

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