ADC() function MUST BE RUN in order to show up on the View Variable screen.
Remember that the ADC #1 is on Pin 8 of the DB15 connector (female). ADC #2 on Pin 7.... ADC #8 on pin 1. So please check that you apply to the correct pin.
Run a simple FOR loop to read ALL 8 ADC channels so that you can see which ADC is being energized:
FOR I = 1 to 8
DM = ADC(I)
NEXT
ADC() function MUST BE RUN in order to show up on the View Variable screen.