Fail safe logic monitor

Details Fail safe logic monitor Fail safe logic monitor

1975-03-17

1976-09-28

Robinson, Thomas A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

3401462, H04J 300, G06F 702

Patent

active

039833291

ABSTRACT:
A fail safe logic monitor wherein a multi-bit logic word is multiplexed into a comparator and compared thereby with a multiplexed "hard wired" reference word. The comparator provides an output compatible with conventional a.c. fail safe fault logic. Features of the invention include self monitoring any single internal failure for indicating a fault while the monitor is on line and automatic test ability and compatibility with existing fault logic.

REFERENCES:
patent: 3688099 (1972-08-01), Buscher
patent: 3784980 (1974-01-01), Geesen
patent: 3892923 (1975-07-01), Ranner

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