Dual current-source digital-input circuit for an industrial...

Details Dual current-source digital-input circuit for an industrial... Dual current-source digital-input circuit for an industrial...

2006-03-28

2006-03-28

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Signal isolator

C250S2140RC

Reexamination Certificate

active

07019318

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.

REFERENCES:
patent: 6388468 (2002-05-01), Li

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