毕业设计 基于PLC交通灯控制.docVIP

摘要 近年来随着科技的飞速发展，PLC的应用正在不断地走向深入，同时带动传统控制检测日新月益更新。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，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。在实时检测和自动控制的PLC应用系统中，PLC往往是作为一个核心部件来使用，仅PLC方面知识是不够的，还应根据具体硬件结构，以及针对具体应用对象特点的软件结合，加以完善。十分形象地显示出了PLC在交通灯系统中的实际应用。 关键字：PLC 交通灯 程序 报告 设计  ABSTRACT As technology evolved in recent years, PLC is continuously to further promote the traditional test, control and the moon. it has a simple structure and programming for high reliability advantages have been used extensively in industrial process and the automatic control. according to statistics, programmable controllers industrial automation of the most applied a device. experts believe, programmable controller will become the industrial control of major and important infrastructure and Plc, a robot, cad cam will become the industrial production of the three big props. the PLC have to use environment adaptable characteristics, the timer resources is extremely rich, but for the common use gradual the signal for precise control over, especially to control of the fork you can easily achieve. and now increasingly the PLC applied to the traffic lights system. At the same time, PLC communication function itself is a networking will be the same road in the light of a lan unify traffic management, but shorter waiting time, the scientific management.In a real-time detector and automatic control of the PLC application systems, PLC is often used as a core component of the PLC, the only way of knowledge is not enough, according to the specific hardware construction, and directed at specific application objects of the software and perfected. very image of the PLC and the traffic system of practical applications. Keyword ： PLC TRFFIC LIGHT PROGROM REPORT DESIGN 第一章 绪论 当今，红绿灯安装在各个道