Why hasn't the industry standardized sink/source according to sensor/plc component type?

by Phill Donn   Last Updated October 09, 2019 23:25 PM - source

I know quite enough to understand how sink/source works when connecting sensors and PLCs, as well as how it works concerning the electronics components and circuit diagrams. What I don't understand is why the manufacturers have the freedom to choose beetween sink/source when producing a sensor or PLC.

Wouldn't it be easier if all the sensors were standardized as sink and all the PLCs as source, the other way around could work as well.

I am probably missing something regarding this claim so I'd really appreciate if someone could help me understand this matter.

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