System controller and remote fault annunciator with cooperative

Details System controller and remote fault annunciator with cooperative System controller and remote fault annunciator with cooperative

1992-06-03

1994-07-12

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340501, 340520, 340521, 340525, 431 13, G08B 2300

Patent

active

053292731

ABSTRACT:
An annunciator for the conduction status of individual switches wired into a series circuit records this status as status history at regular intervals in a memory. The status history is preferably recorded as individual entries having the identification number of an open switch along with a time stamp specifying the length of time which that switch has been open. The current entry is recorded in the memory and a new entry started each time the switch for which an entry in the memory is being created closes or a switch currently receiving power opens. A controller separate from the annunciator generates a request signal and provides a request time value to the annunciator specifying the time which has elapsed since the request condition was detected. The annunciator uses the request time value to determine the probable switch conduction status at the time of the request.

REFERENCES:
patent: 3967281 (1976-06-01), Dageford
patent: 4271402 (1981-06-01), Kastura et al.
patent: 4295129 (1981-10-01), Cade
patent: 4451225 (1984-06-01), Landis
patent: 4471348 (1984-09-01), London et al.
patent: 4642760 (1987-02-01), Yanai et al.
patent: 4943919 (1990-07-01), Aslin et al.
patent: 5019799 (1991-05-01), Oshiage et al.
Fireye Bulletin E1001 (Nov. 1988).
Fireye Bulletin E3001 (Sep., 1988).
Fireye Bulletin C610 (Feb., 1980).

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