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Digital output protection
updated 3 years, 2 months ago
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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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