BECKHOFF CU8850-0000 - Manual (Page 7)

Product Description
LED Diagnostics
LED Diagnostics
The following table shows the possible states for the LEDs:
LED Assignment Status Meaning
off No power supply connected P10 Power Supply
lights green 24 V
DC
connected
Off USB is operational P20 USB Suspend
Lights USB is in suspend mode/ no device
connected
Off No 15 V supplied P21 USB 15 V
Lights 15 V supplied to USB extension
Off Full-speed device connected P22 USB Device
Full-Speed
Lights No device connected
Off Low-speed device connected P23 USB Device
Low-Speed
Lights No device connected
lights green Current < 500 mA P30 Current load at
USB Port
lights red Current > 500 mA
P30
P23 P22
P21
P20
P10
CU8850-0000 5