本科毕业论文（设计）题目：知识竞赛抢答器 PLC 设计摘 要伴随国内经济和文化实业发展，在诸多公开竞争场所规定有公正竞争裁决，诸如证券、股票交易及多种智力竞赛等，因而出现了抢答器。最初抢答器是由优先权编码器构成逻辑电路，其运算速度慢，线路复杂，可靠性不高，功能也比较简朴，尤其是当抢答路数诸多时，实现起来就愈加困难。因而，一种可以体现竞赛公开、公平、公正性知识竞赛抢答器成为一种需求。本设计将以 PLC 为关键设计了系统构造图、程序指令、梯形图以及输入输出端子分派方案，在保留了原始抢答器基本功能同步又增长一系列实用功能并简化其电路构造，其将以其控制以便，灵活，只要变化输入 PLC 控制程序，便可变化竞赛抢答器抢答方案，从而使得竞赛不停完善其公平、公正性。关键词：PLC；知识竞赛抢答器；七段数码器；IO 分派AbstractWith the development of our country economy and cultural industry,public competition requires a fair adjudgement in many occasions,such as securities and ruling stock trading and various intelligence contest etc，resulting in various responder. First vies to answer first is composed of priority encoder which is constiuted by logic circuit ， the speed and reliability of it is not high and the circuit is complex，but the function is simple. especially when there are many responders，it is more difficult to achieve. Therefore，a responder to reflect a kind of openness，fairness and impartiality of the knowledge competition is a kind of demand occupations.The core of this design is based on PLC ,it is composed of system structure diagram，procedures，ladder-diagram and the allocation of input and output terminals,the design not only retains the basic function of the the original responder but increases a series of practical function and simplifies the circuit structure，it will be easy and flexible to its control ， as long as change the PLC control procedures ， you are able to change the program of the ...
