The feeders will have to see any signals while robot approaches in the lane. At the window is too late as time will be lost trying to find the right/desired tube. Ideal situation is tube is projected from slot before robot gets there to take it. A good analyst will be able to have color for next time and the robot with this time grabs and leaves. Oh, and for both feeder sides.
then there's the matter of we ran out of that color, boss! what now? How does feeder feedback missing info? to whom? Standing order for absence or sequence? This feeder guy better not be what is called in the popular parlance a "bottom feeder!"
