发布时间 : 星期日 文章基于PLC控制的加热炉温度控制系统设计更新完毕开始阅读44bc216e59fb770bf78a6529647d27284a73376c
基于PLC控制的加热炉温度控制系统设计
摘要
温度控制系统广泛应用于丁业控制领域，如钢铁厂、化T厂、火电厂等锅炉 的温度控制系统，电焊机的温度控制系统等。加热炉温度控制在许多领域屮得到 广泛的应用。这方而的应用大多是基于单片机进行PID控制，然而单片机控制的 DDC系统软硬件设计较为复杂，特别是涉及到逻辑控制方面更不是其长处，然 而PLC在这方面却是公认的最佳选择。加热炉温度是一个大惯性系统，一般釆用 PID调节进行控制。随着PLC功能的扩充在许多PLC控制器中都扩充了PID控制功 能，冈此在逻辑控制与PID控制混合的应用场所中釆/HPLC控制是较为合理的。木 设计是利用西门子S7-300PLC控制加热炉温度的控制系统。首先介绍了温度控制 系统的工作原理和系统的组成，然后介绍了西门子S7-300PLC和系统硬件及软件 的具体设计过程。
关键词：西门子S7-300PLC, PID,温度传感器，固态继电器
贵州师范大学毕业设计说明书（毕业论文)
The application of Siemens S7-300 in temperature control
Abstract
Temperature control system has been widely used in the industry controlled fields as the temperature control system of boilers and welding machines in steel works、chemical plant、heat-engine plant etc. Heating-stove temperature control has also been applied widely in all kinds of fields -The application of this aspect is based on wSCM which is making the PTD control, yet the hardware and software design of DDC system controlled by SCM is somewhat complicated , it^s not an advantage especially related to logic control, however it is accepted as the best choice when mentioned to PLC.
The furnace temperature of heating-stove is a large inertia wsystem, so generally using PTD adjusting to control. With the expanding of PLC function, the control function in many PLC controllers has been expanded. Therefore it is more reasonable to apply PLC controlling in the applicable fields where logical control and PID control blend together. The design has utilized the control system with which Siemens S7-300 PLC control the temperature heating-stove. In the first place this paper presents the working principles of the temperature control system and the elements of this system. Then it introduces Siemens S7-300 PLC and the specific design procedures of the hardware and the software.
Key words： Siemens S7-300 PLC，PID, temperature pickup，solid state relay
贵州师范大学毕业设计说明书（毕业论文)
目录
懸 .................................................................... I Abstract ............................................................. II 第一章引言 .......................................................... 1 1.1系统设计背景 ..................................................... 1 1. 2系统丁作原理 ..................................................... 1 1.3系统设计n标及技术要求 ........................................... 2 1.4技术综述 ......................................................... 2 第二章系统设计 ........................................................ 4 2. 1控制原理勹数学模型 .............................................. 4
2. 1. 1PID控制原理 ................................................. 4 2. 1. 2掌握S7-300PLC的PID指令及应用方法 ....... 错误！未定义书签。 2. 1. 3PID指令的使用注意事项 ....................................... 7 2. 2釆样信号和控制量分析 ............................................ 9 2. 3系统组成 ....................................................... 10 第三章硬件设计 .................................................... 10 3. 1 PLC的基木概念 ................................................. 11 3. 1.1模块式PLC的基本结构 ........................................ 11 3. 1. 2 PLC 的特点 ................................................ 12 3. 1.3PLC的应用领域 ............................. 错误！未定义书签。 3. 2 PLC的工作原理 ................................................. 14 3. 2. 1逻辑运算 ................................. 错误！未定义书签。 3. 2. 2 PLC的循环处理过程 ........................................ 14 3. 2. 3用户程序的执行过程 ........................................ 16 3. 3 S7-300 简介 ................................................... 16 3. 3. 1数字量输入模块 ............................................ 16 3.3.2数字量输出模块 .............................................. 17 3. 3. 3数字量输入/输出模块 ....................................... 17 3. 3. 4模拟量输入模块 ............................................ 17 3. 3. 5模拟量输出模块 ............................................ 18 3. 3. 6 S7-300的其他模块 ....................... 错误！未定义书签。 3. 4温度传感器 ..................................................... 18 3.5丨古丨态继电器 .................................................. 20 第四章软件设计 ....................................................... 22 4. 1STEP7编程软件简介 ............................................... 22 4. 1. 1STEP7 概述 ................................................. 22 4. 1.2STEP 7 的硬件接口 ........................................... 22
III
贵州师范大学毕业设计说明书（毕业论文)
4. 1. 3 STEP 7的编程功能 .......................................... 23 4. 1. 4 STEP 7的硬件组态与诊断功能 ................................ 23 4.2 STEP7项冃的创建 ................................................ 24 4.2. 1使用昀导创建项冃 ........................................... 24 4. 2. 2直接创建项冃 ............................................... 27 4. 2. 3硬件组态勹参数设置 ........................................ 28 4. 3用变量表调试程序 ............................................... 35 4. 3. 1系统调试的基本步骤 ........................................ 35 4. 3. 2变量表的基木功能 .......................................... 36 4. 3. 3变量表的生成 .............................................. 37 4. 3. 4变量表的使用 .............................................. 4. 4 S7-300的编程语言 .............................................. 4. 4. 1PLC编程语言的国际标准 ..................................... 4. 4. 2STEP7屮的编程技术 ......................................... 结?棘 ................................................................ 献 ............................................................. 醜 ................................................................... 致谢 ............................................... 错误！未定义书签。
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