Digital Sidecar Problem

[Codec]

We are trying to use the photoelectric sensor as a encoder on our shooter, but we are getting no signal at all through the robot. The photoelectric sensor is connected to the PDB with a 20amp breaker and to the digital sidecar via the signal line on a pwm. We have tried changing the input used on the sidecar, tested the pwm, and even tried replacing the sidecar and DIO module on the cRIO to no avail. Eventually we tried simply replacing the sensor with a switch and found no signal returning to the DS! It was simply the default HIGH signal from the sidecar. We are testing using the default DIO "Simple Digital In" in FRC labview 2012 with the 8-slot cRIO imaged with the 2012 image.