机械毕业设计(论文)-基于PLC的交通信号灯电气控制部分的设计(新)(含全套图纸).doc

目 录 摘要···································································1 关键词·································································1 1 前言·································································2 2 方案论证·····························································5 2.1 基于数电技术交通灯控制系统·······································5 2.2 基于单片机技术的智能交通灯控制统·································6 2.3 基于PLC技术的交通灯控制系统·····································6 3 硬件电路设计及元器件选择·············································6 3.1 PLC的技术指标···················································6 3.2 可编程控制器的选择···············································8 3.2.1 PLC型号的选择················································8 3.2.2 输入输出模块的选择··········································9 3. 3 I/O分配表··········································9 3.4 PLC连接图·························································11 4 软件设计····························································12 4. 1 常用编程语言简介···············································12 4. 2 梯形图设计方法·················································15 4. 3 梯形图·························································16 4. 4 指令表·························································18 结论··································································22 参考文献······························································23 致谢··································································24  基于PLC的交通信号灯电气控制系统的设计 学 生： 指导老师： 关键词：交通灯；控制；PLC Disign of Based on PLC Traffic Light Electric Control System Author:Yang Zhe Tutor:Cai Pei Zhong (Oriental Science ＆Technology College of Hunan Agricultural University, Changsha 410128) Abstract:PLC programmable logic controller is a microprocessor based on a combination of computer technology, automatic control 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 in industrial process an