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Setting Up and Operating the SIMATIC Box PC 840
Warnung
!
Only connect the device to 24V DC power supply systems which meet the
requirements of a safe extra-low voltage (SELV); in addition, a protective
conductor must be connected.
Optionally, one of these power supplies is installed.
Equipotential Measures
Low-impedance ground connections ensure that faults arising from external power
supply cables, signalling cables or cables to peripheral units are diverted.
Therefore connect the equipotential grounding connection on the system housing
to the central earth terminal of the cabinet or the unit, into which the computer is
fitted, in such a way that it has low impedance (large surface area, large contacts).
The minimum cross section should not be less than 5 mm
The connection is on the fan side and is identified by the symbol:
Connecting and Switching on the SIMATIC Box PC 840
Before you connect the SIMATIC Box PC 840 to the mains, the peripheral units
must be connected.
1. Insert the connector cable of the peripheral units into the corresponding sockets
on the port side of the SIMATIC Box PC 840 (see Section 3.4.)
2. Connect the device to the mains.
3. The device is now ready for power supply operation and is now in service.
Switching off the SIMATIC Box PC 840
Before switching off the Box PC 840, you have to shut down the operating system
to avoid loss of data. The Box PC has no mains switch and can only be switched
off after being disconnected from the mains.
Note
If you are working with Windows, always use Start > Shut down in the task bar
for switching off your Box PC.
3-10
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SIMATIC Box PC 840 Manual
A5E00085984-04

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