Elevator hall call cross-cancellation device

Details Elevator hall call cross-cancellation device Elevator hall call cross-cancellation device

1992-12-21

1994-10-18

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Having computer control of elevator

187381, 187382, B66B 114, B66B 152

Patent

active

053570642

ABSTRACT:
A method and apparatus for dispatching elevator cars to hall calls in a system where there are two types of elevator controllers (12, 14) in operation, one (12) of which operates using relay logic. The calls are stored in a relay logic memory common to both elevator controllers (12, 14). A first controller reads the call information directly from the memory (18); the second controller reads the memory through a cross cancellation device (10) which multiplexes the information from the memory so that the calls are provided on a serial link (32) to the second controller (14). The second controller (14) is programmed to respond to calls which the first controller (12) has not answered.

REFERENCES:
patent: 3851733 (1974-12-01), Saekin et al.
patent: 4724931 (1988-02-01), Ichioka
patent: 4836336 (1989-06-01), Schroder
patent: 4844204 (1989-07-01), Ovaska et al.
patent: 4989695 (1991-02-01), Kubo
patent: 4991694 (1991-02-01), Friedli
patent: 5202540 (1993-04-01), Auer et al.

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