BECKHOFF CP77xx - Manual (Page 5)

General Notes
CP77xx 3
Basic safety measures
Only switch the PC off after
closing the software Before the Panel 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 read the
section
Switching the Panel PC on and off.
Warning
Before opening the housing, and whenever the Panel PC is not being
used for control purposes (such as during functional checks after a
repair), all parts of the equipment must first be switched off, after
which the Panel PC is to be disconnected from the equipment.
Disconnect the device by unplugging the connectors on the rear side of the
Panel PC.
Items of equipment that have been switched off must be secured
against being switched on again.
Danger
Displays used for the Panel PC’s LC-display are operated with a voltage of
up to 1000 V, depending on type. For that reason:
The supply voltage must be disconnected before the housing of the
Panel PC is opened!
i
Note
Assembly work on the Panel PC during operation may damage the device:
 if metal objects such as screws or tools fall onto operating circuit
boards.
 if connecting cables internal to the Panel PC are removed or
inserted during operation.