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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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  • 0
    Ok brilliant. Thanks for your help. I understood all of that no problem
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  • 0
    Ok brilliant. Thanks for your help. I understood all of that no problem
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