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The Ringway ISOPLC Series of Opto Isolators are designed to allow the isolated monitoring of low
voltage AC signals (100-250V) or low voltage DC (24-50V) signals using standard DC PLC inputs. The
isolators work by switching their output to the PLC on while an input signal is present. The Isolator output
to the PLC may be wired in either a sourcing or sinking arrangement.