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The following table describes the meaning of the system LED.

Color State Meaning
Duo LED yellow/green
LED green.png
On Operating System running.
LED green.pngLED yellow.png
Flashing Bootloader is waiting for firmware.
LED yellow.png
Flashing Heavy system error: PLC in stop.
LED yellow.png
On Bootloader is waiting for software.
/ Off Power supply for the device is missing or hardware defect.