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Troubleshooting 7-3MN1942
7.2.2 CAN LEDs
The CAN LEDs display the overall condition of the CANopen interface,
once the startup sequence has completed. The LED codes conform to
the CAN in Automation (CiA) DR303_3 indicator standard. The green
LED indicates the state of the node’s internal CANopen ‘state machine’.
The red LED indicates the state of the physical CANopen bus.
Green (run)
X
Off: Node initializing or not powered.
1 flash: Node in STOPPED state.
3 flashes: Software is being downloaded to the node.
Continuous flashing: Node in PRE-OPERA TIONAL state.
Flickering (very fast flashing): Auto-baudrate detection or LSS services in
progress; flickers alternately with red LED.
Continuously illuminated, not flashing: Node in OPERATIONAL state.
Red (error)
X
Off: No errors or not powered.
1 flash: Warning - too many error frames.
2 flashes: Guard event or heartbeat event has occurred.
3 flashes: The SYNC message has not been received within the timeout period.
Flickering (very fast flashing): Auto-baudrate detection or LSS services in
progress; flickers alternately with green LED.
Continuously illuminated, not flashing: The node’s CAN controller is in the BUS
OFF state, preventing it from taking part in any CANopen communication.
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