Beckhoff CX8110, Manual, Page: 63 / 73

Error handling and diagnosis
CX8110 63 Version: 1.4
9.3 E-bus
The power supply unit checks the connected EtherCAT Terminals. The "L/A" LED is lit in E-bus mode. The
"L/A" LED flashes during data transfer.
Table 20: Diagnostic LEDs in K-Bus mode.
Display LED Meaning
Us 24 V Power supply for basic CPU module. The LED lights
green if the power supply is correct.
Up 24 V Power supply for terminal bus. The LED lights green if
the power supply is correct.
L / A off E-bus not connected.
on E-bus connected / no data traffic.
flashes E-bus connected / data traffic on the E-bus.