BECKHOFF CX1020 - Manual (Page 116)

Error handling and diagnostics
114 Embedded PC
CX1100-0004 power supply LEDs
Display LED Meaning
PWR power supply
The LED lights up green when the power supply is correct, but red if
there is a short circuit.
L/A off E-Bus is not connected
on E-Bus is connected / no data traffic on E-bus
blink E-Bus is connected / data traffic on E-bus
RUN Indicates the state of the EtherCAT bus:
off INIT
blink PRE-OPERATIONAL
(frequency: 200 ms on / 200 ms off)
single
flash SAVE-OPERATIONAL
(frequency: 200 ms on / 1000ms off)
on OPERATIONAL
flickering BOOTSTRAP
(frequency: 50 ms on / 50 ms off)
double
flash reserved for future use
(frequency: 200 ms on / 200 ms off / 200 ms on / 1000 ms off)
triple
flash reserved for future use
(frequency: 200 ms on / 200 ms off / 200 ms on / 200 ms off / 200 ms on
/ 1000 ms off)
quadruple
flash reserved for future use
(frequency: 200 ms on / 200 ms off / 200 ms on / 200 ms off / 200 ms on
/ 200 ms off / 200 ms on / 1000 ms off)
The functions for L/A and RUN LED are available in hardware revision > 2.0. The LEDs have no function in older
revisions.