毕业设计（论文）-基于PLC的交通控制灯设计.doc

基于PLC的交通控制灯设计 摘 要 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,PLC、机器人、CAD/CAM将成为工业生产的三 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. 关键词：交通灯 PLC 程序 设计  Abstract PLC programmable logic controller based on microprocessor-based, integrated computer technology, automatic control technology and communication technologies developed from a new type of industrial control devices. It has a simple structure, easy programming, high reliability, has been widely used for industrial process and location of the automatic control. According to statistics, the programmable controller is the most widely used industrial automation equipment in a device. Experts believe that the PLC will become the main means of industrial controls and one of important infrastructure, PLC, robotics, CAD / CAM will be the three pillars of industrial production. The use of the PLC has the characteristics of environmental adaptability, while its internal timer resources are very rich, the current widespread use of the progressive signal for precise control, particularly control of multi-fork can be easily achieved. Therefore, the PLC is now increasingly used in traffic lights system. Meanwhile, PLC itself also has a communications networking capabilities, the same signal on the road to form a unified LAN management, and can shorten the waiting time for vehicle traffic, to achieve scientific management. Keywords: PLC programming traffic lights  目 录 摘 要 I 引 言 IV 1 PLC的特点及应用 1 1.1 PLC的简介 1 1.2 PLC