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The sensor I want is both ac and dc from kele. I just figured it would be easier to power it right from the controller. Im just going to steal 24v from one of the rtus in the building.

Why not use a CO2 sensor that uses AC ? Most do either AC or DC as the power supply with a 0-10vdc signal out.

What sensor are you using?

Originally Posted by Igotworms

Thanks Digo, that power wiring is referring to NDIO power. I want to use a power supply that is powering something else for the CO sensor. I dont think that should be a problem.

Correct, it's simply saying to keep the power for the ndio isolated, when using the IO-34 module. So in the case of your CO2 sensor, don't use the same power supply that powers the ndio.

Thanks Digo, that power wiring is referring to NDIO power. I want to use a power supply that is powering something else for the CO sensor. I dont think that should be a problem.

IO-34-H Input/Output module Installation Instructions.
IO-16-H doesn't mention it.

Thats what I thought, looks like I need another controller. Digo, where did you get that info about the 24v transformer?

Originally Posted by Igotworms

can an NDIO board supply DC power to a sensor?

No. You must use an external power supply. Also:

If powering from a 24 V transformer, do not power other equipment with it. Otherwise, con-ducted noise problems may result. Also, do not ground either side of the transformer’s 24 V secondary.

NDIO Active Input

Ive used NDIO modules before, but never with an active input. I want to tie in a CO sensor that uses 0-10V, but can an NDIO board supply DC power to a sensor?