PLC在化学反应装置中的应用

论文编号:ZD708    论文字数:13198,页数:43

 摘要
 随着社会的不断进步和各种轻工业的飞速发展，化学化工厂已经成为不可缺少乃至对国民经济产生至关重要的一门行业。在化学化工厂中有各种化学装置，可以说化学装置的应用是很普遍的，并且在工业中占有非常重要的地位。
 本文主要设计一种用可编程控制器用于化学反应装置过程中的系统，可编程控制器是一个智能控制器，他有自己的CPU和控制软件，主要完成现场的数据采集、转换、存储、报警和控制等功能。我们所设计的这个系统，有两种状态一种是自动状态，另一种是手动状态，在这里我们主要对自动进行研究。系统可以对温度进行及时显示；一旦温度超出给定范围就报警；而且温度的给定值是可以预置，这就给于各种化学物质的反应提供了条件。整个系统充分利用了现代先进技术，提高了劳动生产率，改善了劳动条件，减轻了工人劳动强度，不仅可以克服人为的不稳定因素，而且可以吸收人为调节的优点，为现代化的生产管理提供了强有力的物质条件，为社会的发展和进步服务。
关键词：PLC  化学反应装置  PID  数码显示

 Abstract
 Along with social progress and the rapid development of a variety of light industry, chemical, chemical plants have become indispensable to the national economy as well as generate critical to a business. There are a variety of chemical chemical chemical devices, can be said that the application of chemical plant is very common, and in industry occupies a very important position. In this paper, design a programmable controller used for the chemical reaction device in the process of the system, programmable controller is an intelligent controller, he has his own CPU and control software, mainly to complete the field data acquisition, conversion, storage, alarm and control functions. We designed this system, there are two states is automatically a state, the other is the manual states, where we mainly study the automatic. System can display the temperature in time; once the temperature exceeds a given range on the alarm; and temperature can be pre-given value, which gives a variety of chemical substances to provide the conditions for the reaction. The whole system made full use of modern advanced technology, to improve labor productivity, improved working conditions, reducing the labor intensity, not only can overcome the human factors of instability, but also can absorb artificially adjust the advantages of a modern production and management provides a strong strong material conditions for social development and progress.
 Key words: PLC chemical reaction device PID digital display
 

目 录

摘要 1
Abstract 1
第一章  绪  论 2
1.1 系统介绍 3
1.2 系统方案论证 4
1.3可编程序控制器的发展及应用 6
1.4系统设计方法和步骤 7
第二章  系统硬件设计 9
2.1系统总电路图 9
2.2  PLC的型号选择以及硬件配置 10
2.3系统的I/O点地址分配以及外部接线图 12
2.4温度采集处理 14
2.5 数码管显示温度值 17
2.6 拨码盘给定温度值 18
2.7 温度控制触发电路 19
第三章 系统软件设计 21
3.1化学反应过程的主程序设计 21
3.2 PID闭环控制系统设计 23
3.3 数码显示的程序设计 26
3.4 程序清单 27
3.5 系统调试 27
参考文献 29
附录A  系统梯形图 30
附录B  系统程序清单 37
致   谢 42

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