基于西门子PLC控交通灯毕业设计.doc

Xinyu College 毕业设计（论文） （ 2010 届） 题 目基于西门子S7-200的交通灯控制设计 学 号 姓 名 所 属 系 机电工程系 专 业 应用电子技术 班 级 07应电班 新余学院教务处制 基于西门子S7-200的交通灯控制设计 摘 要 自从交通灯诞生以来，其内部的电路控制系统就不断的被改进，设计方法也开始多种多样，从而使交通灯显得更加智能化。尤其是近几年来，随着电子与计算机技术的飞速发展，电子电路分析和设计方法有了很大的改进，电子设计自动化也已经成为现代电子系统中不可缺少的工具和手段，交通控制更是趋向智能化方向发展，LED交通信号灯在持续发光、雨淋、灰尘等恶劣的气候条件下，仍然能保持较好的工作性能，而且价格更低廉。本文主要通过西门子PLC 控制交通红绿灯。 Based on the design of Siemens S7-200 traffic control ABSTRACT Since the birth of traffic lights, the circuit in its internal control system have continually been improved, also began to design methods varied, so that traffic lights become more intelligent. In particular, in recent years, with electronics and the rapid development of computer technology, electronic circuit analysis and design methods have greatly improved, electronic design automation has become a modern electronic system in an indispensable tool and means now, PLC todays rapid technological development, has become an increasingly widespread applications in industrial automation position is extremely important, widely used in various industries. With the development of science and technology, programmable controllers improvement of the function, together with the small, low-price, high reliability in the modern industry of a more prominent role, And more traffic control Trend is the development of intelligent, LED traffic lights in the continuing luminescence, rain, dust and other adverse weather conditions, can still maintain good work performance and lower prices. In this paper, Siemens Programmable Logic Controller control traffic through the traffic lights. Key words: Siemens S7-200, traffic lights, PLC, ladder-diagram. 目 录 第1章：plc的基础知识 4 1.1概述 4 1.2 plc的由来与发展 4 1.21 由来 4 1.22 发展 4 1.3 plc的功能 5 1.4 plc的工作原理和结构 6 1.41 PLC的工作原理 6 1.42结构 6 1.5 PLC的硬件介绍及选型 6 1.51 硬件介绍 6 1.52