BECKHOFF CP790x-140x - Manual (Page 25)

Troubleshooting
6 Troubleshooting
Pixel errors
Note
Pixel errors in the TFT display are production-caused and represent no complaint-
reason!
Fault
Cause Measures
The Control Panel shows no
function No power supply to the Control
Panel/ Industrial PC
Cable not connected
Check power supply cable
1. Correctly connect cable
2. Call Beckhoff Service
Computer boots, software starts,
but control does not operate
correctly
Cause of the fault is either in the
software or in parts of the plant
outside the Industrial PC Call the manufacturer of the
machine or the software
No screen Transmission rate is too high when
using DVI cables longer than 20 m Limit transmission rate for
DDC file to 50 kHz
USB error while TwinCAT access
via USB Cycle time in TwinCAT is set on
10 ms (standard) Increase the cycle time up to
50 ms till 80 ms
The Control Panel functions only
partially or only part of the time, e.g.
no or dark picture Faulty backlight in the display
Defective components in the
Control Panel
Call Beckhoff Service
Call Beckhoff Service
CP790x-140x 23