Description: Design task and the basic requirements: (1) system control the elevator and from 1-9 floors. (2) the number of passengers going to the floors can be manually entered and displayed (Make A number). (3) The elevator floor number can be automatically displayed (set to B number). (4) When A> B, the system can output three-phase motor is transferred to the timing signal, so that the lift rise when the A <B时，系统能输出使三相电机反转的时序信号，使电梯下降；
当A=B时，系统能输出使三相电机停机的信号，使电梯停止运行并开门；
(5)梯是上升还是下降各层电梯门外应有指示，各层电梯门外应有使电梯上升或下降到乘客所在楼层的控制开关。
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elevator.doc
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