BECKHOFF C9900-A172 - Manual (Page 4)

General Notes
Basic safety measures
Only switch the PC off after
closing the software Before the Industrial PC is switched off, software that is running must
be properly closed.
Otherwise it is possible that data on the hard disk is lost. Please refer to
the notes in the instruction manual for the Industrial PC.
Warning
Switch off all parts of the equipment, then uncouple the fieldbus!
Switch off all system components and uncouple the Industrial PC from the
system before opening the PC case and whenever the PC is not used for
control purposes, e.g. during installation of the PCI bus transmitter card.
Pulling out the fieldbus connection plug uncouples the PC (optional).
Items of equipment that have been switched off must be secured against
being switched on again.
Warning
Uncouple the supply voltage before opening Industrial PC, Control
Panel or DVI/USB extension module cases!
i
Note
Do not exchange any parts when under power!
When components are being fitted or removed, the supply voltage must be
switched off.
Assembly work can cause damage:
• If metal objects such as screws or tools fall onto operating circuit
boards.
• If internal connection cables are unplugged or plugged in during
operation.
• If plug-in cards are removed or inserted when the PC is switched
on.
DVI/USB extension C9900-A17x 3