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Unread 25-01-2015, 17:19
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Re: Photoeye's not working-Difference between RoboRIO and Digital Side Card?

Quote:
Originally Posted by Al Skierkiewicz View Post
Seth,
Can you tell us which meter you were using and I am guessing you were in continuity mode and not resistance mode? It is possible that there is a component in series with the negative lead on one or more of the control components. Your meter might have reduced the impedance sufficiently to allow the sensor to turn on. Depending on the component and the series impedance, it is possible that the sensors are not receiving sufficient power supply to operate. As I remember, the Banner sensors require a specific power supply voltage.
Al, I guessed that some circuitry internal to the meter was affecting my results but I couldn't quite put my finger on it. I was in continuity mode and I believe it was on one of our Extech MN35's (I am away from the shop and can't confirm this, but I am fairly confident that's the meter we used). It was very odd, but the sensor functioned perfectly with the meter in place and operated as Scott described in the original post when the meter wasn't being used. If it helps, the working Allen-Bradley sensors are the 42EF-D1MNAK-A2 and the Banners we tested were the QS30LV.
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