【精品】基于PLC的交通灯控制系统的仿真.doc

摘? 要 古老的交通灯控制系统大多是由数字电路来实现的，随着社会经济的发展，数字电路交通灯越来越不能满足日益增长的交通压力，因此必须寻求一种新的方法来取代这种复杂而工作不稳定的控制系统。现今PLC技术飞快发展，应用越来越广，在工业自动化中的地位极为重要，广泛的应用于各个行业。随着科技的发展，可编程控制器的功能日益完善，加上小型化、价格低、可靠性高，在现代工业中的作用更加突出。本论文就是运用PLC原理来实现对十字路口的交通灯的控制，介绍了基于可编程序控制器在交通系统的运用，系统介绍了可编程序控制器的基本原理。我们所设计出来的交通灯必须美观、大方、经济适用、有多种变化，为了达到要求，并考虑到节省电子元件的成本，以达到最大经济效益，运用系列的PLC来控制红绿灯的变化，经过对现今交通灯控制系统进行实地考察，选择一种最优方案，用以在一定程度上缓解目前交通压力。 关键词： ABSTRACT The most ancient traffical light control unit was designed by digital electric circuit. With the development of science and technology,the traffic light which designed by electric circuit can not contain the increseing pressure of the traffical day by day,so we must find a new method to replace the control unit which is complex and worked insteady.Nowaday,the technical of programbal logic controller advanced raiply,and use more and more wide.PLC（Programmable Controller）is one of the most important components of the industry automation. PLC provide automation solution across a broad range of many industries. With the development of science and technology, the function of PLC is more and more perfect, and its get smaller, smarter, more interoperable, more reliable.this thesis was designed by PLC to control the traffical light.we design a traffical lightBased on application of PLC in the traffic system, this paper systematically describes the foundational principium,the request of the design must be beautiful, generous, the economy apply, has many varieties. Should request for the sake of attain, and consider the cost of the economical electronics component, to attain the biggest and economic performance,adopt little programbal logic controller to control the change of the traffical light,we have checed the present traffic control unit,shoose a best plan,in orde to alleviate the present traffic pressure. Keywords: Traffic light；PLC ；Tutomatic allies control 目 录 第一章 绪 论 1 1.1 交通灯的发展史 1 1.2 我国城市交通的发展现状 2 第二章 PLC的基础知识 3 2.1 PLC的由来 3 2.2 PLC的结构 4 2.3 PLC的特点和功能 5 2.3.1 PLC的特点 5 2.3.2