B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/21
B66B 1/00 (2006.01) B66B 5/02 (2006.01) G05B 15/02 (2006.01) G06F 11/00 (2006.01) G06F 11/16 (2006.01)
Patent
CA 1227584
28 ABSTRACT OF THE DISCLOSURE An elevator system, and method of monitoring same, which includes a plurality of elevator cars under the group supervisory control of at least first and second processors, which all share a common memory over a system bus. The first processor periodically monitors its own status, and it sets a predetermined location of the shared memory each time it finds its status to be normal. The second processor periodically checks the predetermined location, and upon finding it set, it resets it. The second processor also monitors its own status. The second processor triggers a retriggerable hardware timer each time it determines that the first processor and itself are both operating normally, with the trigger rate preventing the timer from reaching the end of a predetermined timing period. When the second processor finds the status of either processor to be abnormal, it terminates its trig- gering of the timer. The timer then provides a signal at the end of its timing period, which reinitializes both processors.
462829
Husson Alan L.
Polis Marjorie J.
Oldham And Company
Westinghouse Electric Corporation
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