毕业设计论文——基于PLC交通灯控制系统的设计

PAGE 2PAGE 28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。可编程控制器(PLC)以微处理器为核心，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，编程容易，功能扩展方便，修改灵活,而且结构简单，抗干扰能力强。西门子可编程控制器指令丰富，可以接各种输出、输入扩充设备，有丰富的特殊扩展设备，其中的模拟输入设备和通信设备更是符合交通灯控制系统的要求与特点，能够方便地联网通信。本文选择西门子可编程控制器S7-200为核心部件，着重进行硬件接口设计，利用梯形图和语句表进行编程，实现了十字路口交通灯控制系统的自动化。关键词 PLC；交通控制；自动化 TC Abstract \l 1 AbstractSince the birth of traffic lights, its internal control system have continually been improved. Also began to design methods varied, so that traffic lights become more intelligent.The PLC with microprocessor as the core, widely adopt ladder diagram language base on the relay contactor control system electrical schematic in programming, so that they are easy to program , to expand the functions and to amend, they have simple structure and strong anti-interference ability .Siemens PLC rich instruction, can take a variety of exports、imports expanded, the analog input devices and communications equipment is more in line with the traffic light control system with the characteristics, to facilitate networking and communications.This paper chooses Siemens PLC S7-200 as the main components, focus on the hardware interface design , make use of the ladder diagram and the sentence form to carry out a programming , the realization of the traffic lights at the crossroads automation control system.Keywords: PLC traffic control Automation目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc217136490 摘要 PAGEREF _Toc217136490 \h I HYPERLINK \l _Toc217136491 Abstract PAGEREF _Toc217136491 \h II HYPERLINK \l _Toc217136492 第1章 绪论 PAGEREF _Toc217136492 \h 1 HYPERLINK \l _Toc217136493 1.1课题背景 PAGEREF _Toc217136493 \h 1 HYPERLINK \l _Toc217136494 1.2研究目的和意义 PAGEREF _Toc217136494 \h 1 HYPERLINK \l _Toc217136495 1.3本文的主要工作 PAGEREF _Toc217136495 \h 2 HYPERLINK \l _Toc217136496 第2章 可编程程序控制器（PLC） PAGEREF _Toc217136496 \h 3 HYPERLINK \l _Toc217136497 2.1 PLC概述 PAGEREF _Toc217136497 \h 3 HYPERLINK \l _Toc217136498 2.1.1 PLC的发展历程 PAGEREF _Toc217136498 \