1、 （ 2011 届） 专科毕业设计（论文） 基于 PLC 多工作方式交通灯设计 学院（部）： 电气与信息工程学院 专 业： 机电一体化技术 学生姓名： 刘晓桂 班 级： 机电 0821 学 号： 指导老师： 职 称： 讲师 最终评定成绩： 2011 年 6 月 I 摘 要 PLC 可编程序控制器是以微处理器为基础，综合了计算机技术、自动控制技术和通讯技术发展而来的一种新型工业控制装置。它具有结构简单、编程方便、可靠性高等优点，已广泛用于工业过程和位置的自动控制中。据统计，可编程控制器是工业自动化装置中应用最多的一种设备。专家认为，可编程控制器将成为今后工业控制的主要手段和重要的基础设备之一，
2、PLC、机器人、 CAD/CAM 将成为工业生产的三大支柱。由于 PLC 具 有对使用环境适应性强的特性，同时其内部定时器资源十分丰富，可对目前普遍使用的“渐进式”信号灯进行精确控制，特别对多岔路口的控制可方便地实现。因此现在越来越多地将 PLC 应用于交通灯系统中。同时， PLC 本身还具有通讯联网功能，将同一条道路上的信号灯组成一局域网进行统一调度管理，可缩短车辆通行等候时间，实现科学化管理。 随着社会经济的发展，城市交通问题越来越引起人们的关注。 本文选择三菱可编程控制器 FX2n 为核心部件，着重进行硬件接口设计，利用梯形图和语句表进行编程，实现了十字路口交通灯控制系统的自动化。 关键
3、词 : PLC， 交通控制 ， 自动化 II ABSTRACT The programmable preface in PLC controller is a kind of new industry controls the device, it regard microprocessor as the foundation, synthesizing the calculator technique, automatic control technique to develop with the communication technique .It has the constructio
4、n simple, the plait distance is convenient, high etc. in dependable advantage, already extensive used for the industry process with the automatic control of the position inside. According to the covariance, the programmable controller is a kind of equipments that industry automate to equip the insid
5、e the application at most. The expert thinks, the programmable controller will become the main means that aftertime industry control with the one of the important foundation equipments, the PLC, robot, CAD/ CAM will become three major of pillar that industry produce. Because the PLC has to the stron
6、g characteristic in adaptability in environment in usage, its inner part settles at the same time the machine resources is abundant very, can to current widespread usage of enter the type gradually the signal beacon proceeds the precision controls, special the oscular control in a many branch roads
7、can realizes expediently. So that is applied the PLC more and more now in transportation light system inside. At the same time, PLC still have the communication internet function, constitute the same of the signal beacon on the road of bureau area net proceeds to unify to adjust a management, can sh
8、orten the vehicle go through waiting time, realizing scientific management. This paper chooses Mitsubishi PLC FX2n as the main components, focus on the hardware interface design, make use of the ladder diagram and the sentence form to carry out a program, the realization of the traffic lights at the crossroads automation control system. Keyword: PLC， traffic control， Automation
