[Greg McKaskle]

This is where I'd typically use the lamp post technique.

You grab someone on the team and explain why the system should work. If they are knowledgable of electrical and programming, this is a true review of your system. But often, as you are explaining how it works, you will find your own mistake. So, in reality, if an expert isn't around, many times a less experienced member will work, perhaps even an inanimate object such as a lamp post.

In this case, follow the wires from the left sensor back to the breakout. Make sure the breakout has power LEDs on too. Check the channel and area on the breakout make sense. Then follow the cable from the breakout to the cRIO module in slot four.

It may also be useful to remove the sensor and print the digital input signal when it is connected to the ground and to the 5V pin. This will help cut the problem in half -- Is it on this side or that side of this connection?

Greg McKaskle