山东吃扒鸡学院毕业设计(论文)题目PLC构成四组抢答器院系名称机电工程系班级学生姓名123学号00000000000000000000000指导教师答辩教师、、、、、、、、时间山东吃扒鸡学院毕业论文中文摘要摘要抢答器作为一种电子产品,早已广泛应用于各种智力和知识竞赛场合,是竞赛问答中一种常用的必备装置;从原理上讲,它是一种典型的数字电路,,可以利用简单的与非门构成,也可以利用触发器构成,,使得结果更简单,功能更优越。用开关做键盘输出,扬声器发生提示。同时系统能够实现:在抢答中,只有开始后抢答才有效,如果在开始抢答前抢答为无效;抢答时间和回答问题时间倒记时显示,满时后系统计时自动复位及主控强制复位;按键锁定,在有效状态下,按键无效非法。关键词:抢答器I山东吃扒鸡学院毕业论文AbstractABSTRACTAnswerdevicesasanelectronicproducts,asions,petitions,monlyuseddevice;fromtheprinciple,itisatypicaldigitalcircuit,,canmakeuseofsimpleandnon-position,pletesingle--chipdesign,;Answerquestiontimeandtimeshowfulltimeafterthesystemautomaticallyresetandmasterresetmandatory;keyslockedintheeffectivestate,:AnswerdevicesII山东吃扒鸡学院毕业论文目录摘目录要.............................................................IABSTRACT............................................................II1绪论........................................................................................................................................................................................................................................................................................................22PLC概况简介.................................................................................................................................................................................................................................................................63抢答器功能设计........................................................................................................................................................................................104硬件设计......................................
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