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How to find out the status of a relay using NI 9229 AI DAQ

Hi,

My application is to test a controller. This controller has a relay inside, and COMMON, N.C., N.O. terminals are available outside.

Initially, COMMON and N.C. are shorted together, when a trip point becomes active in the controller, the COMMON and N.O. gets shorted.

 

My problem is how to measure wheter the COMMON is connected with N.O. or N.C. using DAQ???

 

There is no circuit connected external to these relay pins.

I am using 9718 Chassis, 9229 AI DAQ, 9269 AO DAQ and 9403 DIO. However, the AO Pins are already connected to other places, so I can't use this.

 

Only I have left 9229 AI DAQ to check this relay status. If I connect the AI between COMMON and N.O. I am getting open circuit voltage also as 0V, and I guess if I connect COMMON & NC across the AI DAQ the Short circuit voltage also 0V.

 

Thanks,

R Ravi

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