吴志洲的论文.docVIP

PLC在控制十字路口交通信号灯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。人、车、路三者关系的协调，已成为交通管理部门需要解决的重要问题之一。城市交通控制系统是用于城市交通数据监测、交通信号灯控制与交通疏导的计算机综合管理系统，它是现代城市交通监控重要的组成部分。随着城市机动车量的不断增加，如何采用合适的控制方法，最大限度利用好城市高速道路，缓解交通拥堵状况，越来越成为交通运输管理和城市规划部门解决的主要问题。传统的交通信号灯控制一般采用电子线路和继电器实现，结构复杂，可靠性低，故障率高，较难实现功能的变更。而可编程控制器(PLC)以微处理器为核心，具有可靠性高，控制功能强，使用灵活方便等优点。特别是由PLC实现的控制系统，普遍采用依据继电接触器控制系统电气原理图编制的梯形图语言进行程序设计，结构简单，抗干扰能力强，运行稳定可靠，可方便地设置定时时问，编程容易，功能扩展方便，修改灵活等，并且有完善的自诊断和显示功能，维修工作极为简单。本文就是基于通过调试完成对交通信号灯的控制设计。　　 关键词：；交通灯；设计Abstract As the social and economic development, urban traffic problems are becoming more and more of concern. People, vehicles and road the coordination, has become a traffic management departments need to solve one of the important issues. Urban traffic control system is used in urban traffic data monitoring, traffic lights and traffic control re-direction of computer integrated management system, it is a modern city traffic monitoring important components. As the amount of vehicles increasing, how to use the appropriate control methods, Max good city high speed roads, to relieve traffic congestion status, becoming transport management and urban planning departments of the major problems to be solved. The traditional traffic signal control generally use the electronic circuits and relay, structure complex, reliability and low, the failure rate is high, the more difficult to implement functionality changes. While the programmable logic controller (PLC) microprocessor, with high reliability, control functions, easy to use and flexible. In particular, by the PLC control system, widely used by relay control system electrical schematic diagram of the ladder diagram language program design, the structure is simple, uding, run stable and reliable, you can easily set up a scheduled time, programming, extensions, easy to modify the flexible etc., also have excellent self-diagnosis and display features, repair work is extremely simple. This article is based on PLC completed by debugging on traffic light control de