Siemens SIMATIC Panel PC 870 Equipment Manual page 28

Starting Up the Computing Unit
No provision is made for connection to non-grounded or impedance-grounded
power supply systems (IT networks).
The power cable should comply with the safety guidelines of the country
concerned.
Lay the cables so that no one can step on or trip over them.
Never connect or disconnect power cables or data transmission lines during a
thunderstorm.
In an emergency situation (for instance, damage to the housing, controls or power
cable, penetration by liquids or foreign bodies), pull the power plug and contact the
authorized service department.
The computer unit must be switched off before connecting/disconnecting I/O
devices (keyboard, mouse, printer, etc.). Failure to do so can result in damage to
the computer unit.
A connector safety interlock is supplied with a 120 V/230 V power supply.
Caution
!
The computer unit with AC power supply is equipped with a safety-tested mains
cable and may only be connected to a grounding outlet.
Make sure that the outlet on the device or the grounding outlet-socket of the
building installation is not obstructed and is installed as close as possible to the
device.
The computer unit does not have a mains switch. To disconnect the device from
mains completely, remove the mains plug. This area must be easily accessible.
When installing the device in a cabinet, a central mains switch must be provided.
Turning off the computer unit
The computer unit does not have a mains switch and can only be disconnected
from the mains supply only by unplugging the power connector.
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SIMATIC Panel PC 870 Computing Unit, Equipment Manual
Release 11/02