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  • Bri-Guy

    Member
    February 1, 2022 at 10:14 pm

    RedShift,

    The best thing to do is to isolate the two voltage potentials. If they are different you do NOT want to have them tied together – isolation is best. I would suggest either use one of your RELAY outputs which are just allowing you to complete a circuit for your 28 VDC source or if you need to drive the 28 VDC source by one of the digital pins you can do so by using a simple MOSFET or BJT transistor to act as a digital “switch” (you can get these as an optically isolated version as well).

    Bri-Guy

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