Status LEDs
![]()  | Live transmission of the LEDs in TwinCAT In the "Product View" tab, TwinCAT version 4024.59 and higher displays the state of the LEDs live.  | 
LED  | Color  | SlotGroup concerned  | Meaning  | 
|---|---|---|---|
Link/Act (X40)  | Green  | --  | See chapter Status LEDs.  | 
Link/Act (X41)  | Green  | --  | See chapter Status LEDs.  | 
Run  | Green  | --  | See chapter Status LEDs.  | 
AI  | Green  | SlotGroup 4  | The analog input is enabled.  | 
ERRI  | Red  | SlotGroup 4  | Signals the status bit "Error" of the analog input.  | 
AO  | Green  | SlotGroup 5  | The analog output is enabled.  | 
ERRO  | Red  | SlotGroup 5  | Signals the status bit "Error" of the analog output.  | 
DI1  | Green  | SlotGroup 2  | Status of digital input channel 1  | 
DI2  | Green  | SlotGroup 2  | Status of digital input channel 2  | 
DI3  | Green  | SlotGroup 2  | Status of digital input channel 3  | 
DI4  | Green  | SlotGroup 2  | Status of digital input channel 4  | 
DIO1  | Green  | SlotGroup 1  | Status of the signal at X03, pin 4.  | 
DIO2  | Green  | SlotGroup 1  | Status of the signal at X03, pin 2.  | 
DIO1´  | Green  | SlotGroup 1  | Synchron with LED "DIO1".  | 
DIO2´  | Green  | SlotGroup 1  | Synchron with LED "DIO2".  | 
DO1  | Green  | SlotGroup 3  | Status of the signal at X04, pin 4 1)  | 
DO2  | Green  | SlotGroup 3  | Status of the signal at X04, pin 2 1)  | 
C1  | Green  | SlotGroup 1  | Status of the signal on X08, pin 4  | 
C2  | Green  | SlotGroup 1  | Status of the signal on X08, pin 2  | 
24V Us  | Green  | --  | See chapter Status LEDs.  | 
Up 24V  | Green  | --  | See chapter Status LEDs.  | 
1) When the pin is configured as a PWM output, the LED signals a high level of the PWM signal. This means that the LED is very dim at low pulse widths.
