文档介绍：可编程控制器PLC系统设计设计题目:六路抢答器的设计与实现专业:电子信息科学与技术班级:电信092班学号:2学生姓名:方雄波设计时间:2011-2012学年上学期教师评分:·······································································································································24..梯形图·························································································)抢答器同时供六名选手或六个代表队比赛,--。2),该开关由主持人控制,当主持人按下“”抢答计时40秒开始计时。主持人前台开始指示灯亮。3)抢答器具有锁存与显示功能。即在规定时间(40秒)内选手按动按钮,锁存相应的编号,同时扬声器发出报警声响和对应灯亮作为提示。选手抢答实行优先锁存,灯亮3S扬声器响2S。选手抢答有效后,主持人前台指示灯熄灭。4)参赛选手在设定的时间内进行抢答,抢答有效,定时器停止工作,并保持到主持人将系统清除为止。5)如果定时时间已到,无人抢答,本次抢答无效,系统报警并禁止抢答,报警响直到主持人按下“”将系统清除,继而进行下一轮抢答。==,S5T#==,S5T#,S5T#30S===,S5T#=Q