加热炉温度控制系统设计毕业设计(论文)

毕 业 设 计 [论 文] 题 加热炉温度控制系统设计

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河南城建学院本科毕业设计（论文） 摘要

摘 要

可编程控制器是一种应用很广泛的自动控制装置，它将传统的继电器控制技术，计算机技术，通讯技术融为一体，具有控制力强、操作灵活方便、可靠性高、适宜长期连续工作的特点。

本文通过对电加热炉温度控制系统国内外情况的分析，确定了设计目标。主要通过对系统的总体方案设计，硬件的选择、设计、使用，软件程序的编写等方面作了论述，并详细介绍了各个模块的原理、设计和使用，对程序中所使用的控制算法进行了详细的介绍。在此设计中以西门子S7-200PLC作为控制核心，通过温度检测变送单元对加热炉温度进行实时检测，由模拟量扩展模块EM235将检测信号传输给PLC,经过PID运算输出控制信号，控制信号通过控制调功器改变加热器，以此达到对系统温度的控制作用。

关键词： 电加热炉，S7-200PLC，温度控制系统

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河南城建学院本科毕业设计（论文） Abstract

Abstract

The programmable controller is a automatic control device which is widely used, it will be the traditional relay control technology, computer technology, communication technology com., has strong control ability, flexible and convenient operation, high reliability, suitable for long-term continuous working characteristics.

Based on the analysis of the electric heating furnace temperature control system at home and abroad situation, determine the objectives of the design. Mainly through the design of the overall scheme of the system, hardware selection, design, use, software programming and other aspects, and introduces the principle, design and use of each module, the control algorithm used in the program are described in detail. In this design the Siemens S7-200PLC as control core, through the temperature detection transmission unit for real-time detection of the temperature of the heating furnace, by analog expansion module EM235 will detect the signal transmission to PLC, after PID operation and the output control signal, the control signal by controlling the power regulator changing heater, to control the function of the system temperature.

Keywords: electric heating furnace，S7-200PLC，temperature control system

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河南城建学院本科毕业设计（论文） 目录

目 录

摘 要......................................................................I Abstract...................................................................II 1 绪 论 .................................................................... 1

1.1 系统设计背景........................................................... 1 1.2 温度控制系统的发展状况 ................................................. 1 1.3 本文的研究内容......................................................... 3 2 设计总体方案及控制算法描述 .................................................. 4

2.1系统总体方案 ........................................................... 4

2.1.1 硬件方案设计 ..................................................... 4 2.1.2 软件方案设计 ..................................................... 5 2.2 PID控制算法 ........................................................... 7

2.2.1 PID算法 ......................................................... 7 2.2.2 PID参数整定方法 ................................................. 8

3 系统硬件设计 .............................................................. 10

3.1 系统的硬件组成........................................................ 10

3.1.1 系统结构组成 .................................................... 10 3.1.2 系统各个组成部分完成的任务 ...................................... 10 3.2 可编程控制器.......................................................... 10

3.2.1 PLC的特点 ...................................................... 11 3.2.2 PLC的选型 ...................................................... 11 3.2.3 西门子S7-200主要功能模块介绍 ................................... 12 3.2.4 S7-200PLC中PID回路指令 ........................................ 15 3.3系统其他硬件选型及配置 ................................................ 18

3.3.1 显示模块........................................................ 18 3.3.2 集成式温度传感器 ................................................ 19 3.3.3 调功器.......................................................... 20 3.3.4 主电路接线说明 .................................................. 22

4 系统软件设计 .............................................................. 24

4.1 编程软件简介.......................................................... 24 4.2 程序设计 ............................................................. 24

4.2.1 主程序部分 ...................................................... 26 4.2.2 标度变换子程序 .................................................. 29 4.2.2 显示模块子程序 .................................................. 31

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