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Sourcing and Sinking PLC I/O using a sensor

Steve Brown
Hi I need help as I'm just not getting this..


Sinking - Power externally supplied. Current passes through load, then into sensor and then to ground.

Sourcing - Sensor uses supply voltage to pass current. Sensor drives current out, through the load on to ground.


I really can't picture how this works even using google images!

Does sinking have a constant supply and sourcing doesn't?


Sorry it just isn't making sense to me.
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    Hi Paul.


    I had to find a simple image on Google and look at it while reading your explanation. I admit it took me a few reads but yes I understand them now. Thank-you for your time in writing all of that, i really appreciate it. It takes me a little while to understand things but I got there lol.
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  • 0
    Hi Paul.


    I had to find a simple image on Google and look at it while reading your explanation. I admit it took me a few reads but yes I understand them now. Thank-you for your time in writing all of that, i really appreciate it. It takes me a little while to understand things but I got there lol.
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