基于plc和vb恒温控制系统.doc

摘 要 温度是工业生产中常见的工艺参数之一，任何物理变化和化学反应过程都与温度密切相关。在科学研究和生产实践的诸多领域中, 温度控制占有着极为重要的地位, 特别是在冶金、化工、建材、食品、机械、石油等工业中，具有举足轻重的作用。自动调节输出电压控制，控制水箱达到设定值参数设置、实时曲线显示界面实现对的实时显示在VB界面上显示出变化的温度曲线，实现良好的人机交流。 关键词：VB、PLC、恒温控制系统人机界面 Abstract The temperature is common in industry one of the process parameters, any physical change and chemical reaction process closely is related with the temperature. In scientific research and production practice of many areas, temperature control plays an important role, especially in the metallurgical, chemical, building materials, food, machinery, petroleum industry, which play a decisive role role. The design based on VB and PLC temperature control system, using PLC as lower machine, on water temperature control, when the temperature sensor detects temperature reduce, control signal automatic regulating output voltage to control the heating device, thereby controlling the water temperature reaches the setting value. On VB platform, developed the PC software, making the parameters setting, real time temperature curve display interface, to achieve water tank temperature real time acquisition, measurement and display. Through the PLC and the VB serial communication, interface in the VB display real-time temperature curve, achieving a good man-machine communication. The system has fast response speed, good stability, high reliability, human-computer interaction effect is good wait for a characteristic, has a practical significance to industrial control. Key words: VB, PLC, temperature control system, man-machine interface 分享到 翻译结果重试 抱歉，系统响应超时，请稍后再试 支持中英、中日在线互译 支持网页翻译，在输入框输入网页地址即可 提供一键清空、复制功能、支持双语对照查看，使您体验更加流畅 第一章 绪 论 1 1.1 课题背景及研究目的和意义 1 1.2 国内外研究现状 1 1.3 课题主要内容 2 第二章 系统硬件设计 3 2.1 PLC概述 3 2.1.1 PLC组成和工作原理 3 2.1.2 PLC的分类及特点 6 2.1.3 PLC程序设计方法 6 2.1.4 PLC控制系统设计的基本原则和步骤 7 2.2 系统主要器件介绍 8 2.2.1 西门子S7-200 8 2.2.3 传感器 13 2.2.4 加热装置 14 2.2.5 变频器 14 2.3 系统整体设计方案及硬件连接图 15 2.4 系统主要模块介绍 16 2.4.1下位机模块 16 2.4.2 数据采集模块 16 2.4.3 数据通信模块 16 2.4.5 执行模块 17 第三章 系统软件设计 18 3.1 STEP