Diagnostic LEDs

Display	LED	Meaning
	TC	TwinCAT status LED: TwinCAT is in Run mode (green). TwinCAT is in Stop mode (red). TwinCAT is in Config mode (blue). Error or crash of the PLC (yellow)
WD	No function ex factory. The LED can be parameterized for user-specific diagnosis messages.
ERR	Lights up red when switching on. Software is being loaded. Goes off if everything is OK. The LED can be parameterized for user-specific diagnosis messages.

Display

LED

Meaning

Diagnostic LEDs 1:

TwinCAT status LED:
TwinCAT is in Run mode (green).
TwinCAT is in Stop mode (red).
TwinCAT is in Config mode (blue).

Error or crash of the PLC (yellow)

No function ex factory. The LED can be parameterized for user-specific diagnosis messages.

ERR

Lights up red when switching on. Software is being loaded. Goes off if everything is OK.

The LED can be parameterized for user-specific diagnosis messages.

Further Information