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We are working with a spec that calls for 4-state discrete input supervision (open, close, short fault, open fault) on a switch that has internal series/parallel resistors. The short fault must be distinguished from a closed contact.
Has anyone used any brand of PLC that has this available? I know of Modicon (Quantum, Momentum) and AB (ControlLogix) that provide a line break supervision, but not a short circuit.
Even if we have to use 2 PLC inputs per switch, that would be OK. Using analogs would be costly since there are over 500 of these switches to monitor.
Thanks
Don Z.
Has anyone used any brand of PLC that has this available? I know of Modicon (Quantum, Momentum) and AB (ControlLogix) that provide a line break supervision, but not a short circuit.
Even if we have to use 2 PLC inputs per switch, that would be OK. Using analogs would be costly since there are over 500 of these switches to monitor.
Thanks
Don Z.