Beckhoff CU1521 Series - Diagnostic Leds

Mounting and wiring
CU1521-xxxx, CU156124 Version: 2.5
4.3 Diagnostic LEDs
Fig.12: Pin assignment CU1521, CU1521-0010, CU1561
LEDs for fieldbus diagnostics/power supply
LED Color Display State Description
L/A (X1)
green (x2)
green off - no connection on the EtherCAT strand
on linked EtherCAT device connected
flashing active Communication with EtherCAT device
Power green off No supply voltage
on 24V supply voltage present
LED diagnostics EtherCAT State Machine
LED Color Meaning
RUN green This LED indicates the terminal's operating state:
off State of the EtherCAT State Machine: INIT=initialization of the terminal
single flash State of the EtherCAT State Machine: PREOP = function for mailbox communication
and different standard-settings set
flashing State of the EtherCAT State Machine: SAFEOP = verification of the sync manager
channels and the distributed clocks.
Outputs remain in safe state
on State of the EtherCAT State Machine: OP = normal operating state; mailbox and
process data communication is possible
flickering State of the EtherCAT State Machine: BOOTSTRAP = function for terminal firmware
updates
orange on CU15x1 is in EtherCAT mode, rotary switch was moved during operation
Remedy: Resetting or voltage reset
red on CU15x1 is in Ethernet mode, rotary switch was moved during operation
Remedy: Resetting or voltage reset
red/
green
flashing Invalid rotary switch position after power-on
Remedy: Move rotary switch to valid position