说明：  设计一个6层电梯控制器。电梯控制器是按照乘客的要求自动上、下的装置。1、每层电梯入口处设置上下请求开关，电梯内设有顾客到达层次的停站请求开关。2、设有电梯所处位置指示装置和电梯运行模式（上升或者下降降降）指示装置。3、电梯每秒升降一层楼。4、电梯到达有停站请求的楼层，经过1秒电梯门打开，开门4秒后，电梯门关闭（开门指示灯灭），电梯继续运行，直至执行完最后一个请求信号后停留在当前层。5、电梯能记忆电梯
(Design of a 6-story elevator controller. The elevator controller is automatically in accordance with the requirements of the passengers on the device. 1, each elevator at the entrance to request the switch up and down the elevators are equipped with the stops of the customer to reach the level of the request switch. 2 with elevator position indicator device and elevator operation mode (up or down down down) indicating device. Lift second lift floor. The lift reached the floor stops the request, after one second the elevator doors open, open the door four seconds after the elevator doors close (door light is off), the elevator continues to run until after the implementation of the last request signal to stay in the current layer. 5, the elevator can remember the elevator)