Fail-safe apparatus

Details Fail-safe apparatus Fail-safe apparatus

1980-09-22

1982-06-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

043364616

ABSTRACT:
A fail-safe logic circuit which includes a pulse generator driven series arrangement of opto-isolators each of which generates a pulsating signal at its output as a function of the logic level state of its respective input terminal. If all input terminals are logic level highs, then a pulsating output signal is equivalent to a true state whereas either a DC or zero level signal is indicative of a false state.

REFERENCES:
patent: 3408507 (1968-10-01), Martin
patent: 3430066 (1969-02-01), Marsh et al.
patent: 3508078 (1970-04-01), Komamiya et al.
patent: 3743855 (1973-07-01), Struger
patent: 4065683 (1977-12-01), Clarlie
patent: 4097764 (1978-06-01), Sibley
"Design of Fail-Safe Control Systems", J. A. Bryant, Power pp. 52-56 Jan., 1976.

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