郑州大学毕业设计（论文）题 目 基于西门子 S7-200 PLC 温度控 制系统设计 院 系 专 业 年 级 学生姓名 指导老师 年 6 月 2 日摘要温度是多种工业过程最普遍、最关键参数之一，温度控制精度对试验结果或工业生产全部会产生关键影响。传统温控系统实行温控仪表和继电器式控制柜等进行控制，其关键缺点是结构复杂，体积大，故障率高，通用性差，控制精度低．人机交互困难，自动化程度低．难以满足现代生产加工需要。伴随现代传感技术和控制方法不停革新和进展，对实时温度控制精度和反应快速性要求越来越高。本文就是基于PLC温度控制系统设计。本文关键介绍了PLC相关知识、温度控制系统硬件设计、软件设计，同时对传感技术、PID算法和调压技术进行了包含。在硬件上关键实行西门子S7-200系列CPU224XP，K型热电偶传感器及K型热电偶变送器、柱式电压调压器和EM235模拟量输入输出扩展模块。热电偶作为温度采集元件，采集信号经温度变送器转换盒放大后送到EM235处理，随即送入PLC进行PID运算，运算结果控制调压器对加热过程进行调整实现自动化控制。关键词 温度控制 PLC PIDAbstractTemperature is one of the most common variety of industrial processes, the most important parameter, the accuracy of temperature control will have an important impact on the results or industrial production. The temperature control system is adopted in traditional temperature control meter and relay control cabinet control, its main disadvantage is the complicated structure, big volume, high failure rate, poor universality, low control accuracy. Human-computer interaction difficulties, low degree of automation. It is difficult to meet the needs of modern production and processing. With the continuous innovation and development of modern sensor technology and control method, the higher of the real-time temperature control precision and response speed are required. This article is based on the PLC temperature control system design. This paper mainly introduced the PLC related knowledge, the temperature control system hardware...
