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I am onsite in Alabama for a water plant start-up, I have in one of my Remote panels 18 120 Vac inputs into Opto22 I/O for alarms, the inputs come in from a piece of equipment located Approximateley 400 feet away. we supply the 120 vac from our system to the equipment an on the equipment end they use interposing relays to give us a "Dry Contact" input back to our Opto I/O. the problem is I am getting from 34 to 70 volts on my inputs even when the the input is off, can anybody give any help on bleeding this voltage off to ground?