Wiring Balluff Photoelectric Sensor to NI 9411

[MeCoOp]

With the 9411 disconnected I get 24 volts with the when the beam is not broken, 0 volts when the beam is broken.  I'm reading the black wire coming from the receiver and the COM wire from the power supply which is also connected to the (-) wires coming from the emitter and receiver.

[TheGeeze]

Ok Good, so we know the sensor alone is behaving as we expect.  

A few things:

You do not want to connect anything to DIb, this will mean you are measureing a differential device, where 0 V is undefined.  You have a single ended device, so we want to leave that empty.  See this document for a little further explanation.    NI 9411 Operating Instructions

Have you included a pull down resistor as originally suggested, it appears that in the specs you provided they include a resistor to ground.

Try to see your device in Measurement and Automation Explorer before you use DAQ assistant.

Let me know!

Ryan