using DC 2-wire inductive sensors with a 0/16/16

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kmshelton
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using DC 2-wire inductive sensors with a 0/16/16

Postby kmshelton » Mon Sep 09, 2013 12:28 pm

In the Digital Input Primer, it mentions "To properly interface one of these proximity switches to the digital inputs, a 3-wire proximity switch is required" (http://www.phidgets.com/docs/Digital_In ... ity_Switch). What about 2-wire proximity switches?


With my two wire proximity switch, the inputs on the 0/16/16 stay high, even with the proximity switch is off, which I think makes sense because
"In this system a residual current flows through the load even when in the open state and a voltage drop occurs to the sensor when it is in the closed state. (http://www.fargocontrols.com/sensors/inductive_op.html)"

Is a bleeder resistor needed, and, if so, how doe you calculate appropriate values for it?
http://www.ia.omron.com/product/caution ... t_use.html (images of the equations are broken, unfortunately)

kmshelton
Fresh meat
Posts: 2
Joined: Mon Sep 09, 2013 12:15 pm
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Re: using DC 2-wire inductive sensors with a 0/16/16

Postby kmshelton » Mon Sep 09, 2013 12:57 pm

also, just to confirm: the 0/16/16 has a 100K pull-down resistor internally, correct? (http://www.phidgets.com/docs/1012_User_Guide shows a 100K pull-down resistor whereas http://www.phidgets.com/docs/Digital_Input_Primer says "The digital inputs have a built in 15K pull-up resistor.")


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