LED signals reference

LED signals definitions

LED state	Description
On	The LED is constantly on.
Off	The LED is constantly off.
Flickering	The LED flickering will have an On and Off sequence with a frequency of approximately 10 Hz: on for approximately 50 ms and off for approximately 50 ms.
Blinking	The LED blinking will have an On and Off sequence with a frequency of approximately 2,5 Hz: On for approximately 200 ms followed by Off for approximately 200 ms.
Single flash	The LED will have a short flash (approximately 200 ms) followed by a long off phase (approximately 1000 ms).
Double flash	The LED will have a sequence of two short flashes (approximately 200 ms), separated by an off phase (approximately 200 ms). The sequence is finished by a long off phase (approximately 1000 ms).
Triple flash	The LED will have a sequence of three short flashes (approximately 200 ms), separated by an off phase (approximately 200 ms). The sequence is finished by a long off phase (approximately 1000 ms).

LED signal	Meaning
FAULT LED (Red)	Signals if the drive is in fault state. See State Machine in Operation section and Error management section for further information. If the LED state is OFF, the drive will operate normally (it is not in Fault state). If the LED state is ON, the drive is in Fault state.

In EtherCAT firmware, LED signals are described by the following table:

LED signal	Meaning
RUN LED (Green)	Provides information about the EtherCAT network state machine, according to EtherCAT specification.
	LED State	EtherCAT slave status
	Off	INIT
	Flickering	BOOTSTRAP
	Blinking	PRE-OPERATIONAL
	Single Flash	SAFE-OPERATIONAL
	On	OPERATIONAL

ERROR LED (Red)	Provides information about the EtherCAT communication status, according to EtherCAT specification.
	LED state	EtherCAT slave status
	Off	No error
	Blinking	Invalid configuration
	Single flash	Local error
	Double flash	Watchdog timeout

LINK0 & LINK1	Provide information about the Ethernet Link Status in each port.
	LED state	EtherCAT slave status
	On	Port closed
	On-Off alternating	Port opened (activity on port)
	Off	Port opened (no activity on port)

In CANopen firmware, LED signals are described by the following table:

LED signal	Meaning
RUN LED (Green)	Provides information about the CANopen network state machine, according to CiA 303-3 specification.
	LED state	CANopen slave status
	Off	Device is switched off
	Blinking	PRE-OPERATIONAL
	Single Flash	STOPPED
	On	OPERATIONAL

ERROR LED (Red)	Indicates the status of the CAN physical layer and errors due to missed CAN messages.
	LED state	Event	Description
	Off	No error	Device is in working condition.
	Single flash	Warning limit reached	At least one of the error counters of the CAN controller has reached or exceeded the warning level (too many error frames).
	Double flash	Error control event	A guard event (NMT-slave or NMT-master) or a heartbeat event (heartbeat consumer) has occurred.
	Triple flash	Sync error	The sync message has not been received within the configured communication cycle period time out.
	On	Bus off	The CAN controller is in bus off state.

LINK0 & LINK1	Provide information about the Ethernet Link Status in each port.
	LED state	Port state
	Off	Port closed
	On-off alternating	Port opened (activity on port)
	On	Port opened (no activity on port)
	In Everest (EVE) and related products, both Ethernet ports are available and they act as an Ethernet switch. In CAP, DEN, EVS and related products, only Ethernet 1 is available, so only LINK1 signal is present.

After powering on, some of the LED signals can help troubleshoot.

LED signal	Expected start-up behavior
LINK0 and LINK1 (Green)	ON-OFF alternating → The port is open and ready for activity. If EtherCAT cables are connected on ECAT Port 0/1, Link LEDs will light according to the definition. EtherCAT firmware starts with no other LED because the slave will stay in INIT State after power-up until an EtherCAT master forces it to transition to another state.
RUN LED (Green)	OFF → The slave will stay in INIT State after power-up until an EtherCAT master forces it to transition to another state.
ERROR LED (Red)	OFF → The slave will stay in INIT State after power-up until an EtherCAT master forces it to transition to another state. Then, some errors may appear causing the LED to turn ON. If RUN LED is OFF (INIT state) and ERROR LED is Blinking after an EtherCAT master state change, it may indicate that the drive is running the FoE Bootloader.
FAULT LED (Red)	OFF → If the initialization process is correct. Otherwise, ON.

The rest of the LED signals follow the standard behavior.

LED signal	Start-up behavior
RUN LED (Green)	Off during initialization. Blinking (PRE-OPERATIONAL signaling) when initialization is done.
ERROR LED (Red)	Off. Indicates that CAN network is connected and working properly. Start-up LEDs Single flash. If a problem occurs during the transmission of the CAN boot-up message (a NMT message used to notify to the master the presence of the slave), the driver will signal it as shown below. This happens if CAN network is disconnected. Start-up LEDs with CAN error On. This indicates a CAN Bus Off error, most probably generated by a short between CAN high and CAN low lines.
RUN & ERROR LED	Both alternating On-Off (Orange) at 5 Hz. Drive is in the CAN bootloader, in an idle state.
FAULT LED (Red)	Off. Off if initialization is correct, On otherwise.

The rest of the LED signals follow the standard behavior.