Boots – shoes – and leggings
Patent
1983-09-09
1986-01-28
Smith, Jerry
Boots, shoes, and leggings
364132, 187 29R, 371 12, 371 14, 371 15, 371 16, G05B 1502, B66B 100, G06F 1116
Patent
active
045675600
ABSTRACT:
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 triggering of the timer. The timer then provides a signal at the end of its timing period, which reinitializes both processors.
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Husson Alan L.
Polis Marjorie J.
Grossman Jon D.
Lackey D. R.
Smith Jerry
Westinghouse Electric Corp.
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