Input signal switching matrix for an elevator

Details Input signal switching matrix for an elevator Input signal switching matrix for an elevator

1983-04-09

1987-06-30

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082582, 34082583, 187100, H04Q 100

Patent

active

046774378

ABSTRACT:
In this invention, "column" buses connected to a power supply and "row" input lines are arranged in the shape of a matrix, external signal lines are connected to the intersection points thereof, and the "column" buses are switched at predetermined cycles by the signals of a sequence circuit so as to sequentially apply the signals of the external signal lines from the "row" input lines to signal inputting circuits, and when any of the "column" buses, "row" input lines and external signal lines has grounded, the operation of the sequence circuit is ceased during the grounding. Accordingly, the apparatus can sharply reduce the number of signal lines, and it can eliminate the labor of maintenance owing to a reliability higher than that of an apparatus employing a fuse.

REFERENCES:
patent: 4335374 (1982-06-01), Nyuji
patent: 4412218 (1983-10-01), Niitsu
patent: 4518951 (1985-05-01), Backes

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