Dual current-source digital-input circuit for an industrial automation system
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United States of America Patent
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Mar 28, 2006
Grant Date -
Jun 30, 2005
app pub date -
Dec 29, 2003
filing date -
Dec 29, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
An interface circuit for use between an input circuit and an industrial automation system is disclosed. The industrial automation system includes an opto-coupler capable of being operably connected to the interface circuit. The interface circuit includes a first and second terminal, each terminal capable of being operably connected to the opto-coupler. A first current-source is operably connected to the first terminal and a second current-source is operably connected to the second terminal. A reference voltage is operably connected to the first current-source and the second current-source wherein the first and second current-source cooperate to provide a total input current in accordance with the operating characteristics of the industrial automation circuit.
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