文档介绍：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,非常适合温度控制的要求。
本文先从课题研究背景说起,通过几个温控系统简单介绍了国内外发展现状。然后主要通过对系统的总体方案设计,硬件的选择、设计、使用,软件程序的思路、流程图、编写等方面详细介绍了各个模块的原理、设计和使用,并对程序中所使用的控制算法进行详细的介绍。实验证明,以PLC作为控制核心,在通过PLC编程控制温度对象,这种设计方式可以方便快捷的设计出符合要求的温度控制系统。通过本设计可以熟悉并掌握西门子S7-200PLC的原理与功能及它的编程语言,以自动控制理论为指导思想,解决工业生产及生活中温度控制问题。
关键字: S7-200PLC;EM235;温度控制系统
Abstract
With the continuous development of the industrial automatization, people’s requirements for automatics e higher and higher. In recent years, rapid puter technology has been widely used, but in the meantime, traditional industrial control software has critical ings such as long development cycle, low reusability, high price and costly modifications. As more and more automatic equipments are applied and the requirements for industrial control software are higher and higher, the traditional industrial control software can not meet the demand of consumers any more. How to design a flexible and effective automatic control system speedily and conveniently by using industrial control software has e a very important task. PLC (programmable logic controller) is a kind of wildly used automatic control device, and bines traditional relay control technology, computer technique munication technology, and it characterized by strong control ability, flexible operation, high reliability and suitable for continuous working. This thesis introduces the principles, design and application of each module from the selection, design, and application of hardware, and selection, compile of software in details. Experiments prove that use PLC as the control centre and control temperature object through programming by PLC, we can design desirable temperature control system conveniently and flexiblely.
Key words: S7-200PLC; EM235; temperature control system.
目录
第一章绪论 1
1
温度控制系统的发展状况 1
3
第二章设计总体方案及控制算法描述 4
4
4
5
PID控制算法 6
PID算法 7