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Is there a way to put in a negative 12V to the input of a Zelio Logic SR2B121JD rather than a + 12V on input?

No you have to switch the + side. The relay is looking for a high on the input when switches close. The - is a reference voltage. If need to switch the - side of input you will have to buy a PLC instead.

CTA-ID : 2055030
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