Digital input circuit with fault detection means

Details Digital input circuit with fault detection means Digital input circuit with fault detection means

1976-02-05

1976-11-16

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307202R, 307218, 307236, 307261, 307310, 317 33R, 3401461AB, H03K 520, H03K 1914

Patent

active

039926362

ABSTRACT:
The state of a sensing device such as a switch is indicated as a logic signal at a circuit output terminal and a malfunction is indicated at another circuit output when the connections to the sensing device open circuit or short circuit. The input circuit employs a pair of LED photo-isolators which conduct during alternate half cycles of an a-c current which is applied through the sensing device when it is closed. A diode connects in shunt with the sensing device and when the device is open, only one of the photo-isolators conducts. If a malfunction occurs, neither photo-isolator conducts.

REFERENCES:
patent: 3408507 (1968-10-01), Martin
patent: 3491302 (1970-01-01), Madsen et al.
patent: 3691403 (1972-09-01), Newmeyer
patent: 3743855 (1973-07-01), Struger
patent: 3751684 (1973-08-01), Struger

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