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1、 摘 要本文介绍了热打印机控制系统设计开发过程，其开发环境是Windows，开发工具是SIMATIC，西门子公司可视化编程工具STEP7 5.0。论文详尽论述了从需求分析，可行性研究，PLC系统设计，程序设计方法详细设计、硬件组套，以及调试的整个开发过程，总结开发过程中的经验以及改进方法遵循可编程控制器PLC的编程方法。本系统开发成功后可以对热打印机进行处全自动操作，改变以往用继电器对生产过程的控制，自动控制可靠性高，抗干扰能力强并且故障低，发生故障后，能够自动报警，PLC程序有完善的诊断功能和显示功能，开发的PLC程序可以随工艺要求的变化而进行添加、删除、修改等维护操作简单易行，在工业自动化
2、中广泛的使用PLC，通过PLC编程对设备进行全自动的控制，提高工作效率和产品质量，减少人力资源，采用可视化编程工具，使开发的目标程序具有良好的人机界面，简单、易用，方便用户操作等特点，达到满足实际应用的需要。论文从软件工程的角度描述了系统的开发过程，从计划期的问题定义一直到开发期原程序代码都进行比较详细的介绍，这将为系统今后随工艺要求进行修改，维护以及进一步开发提供重要的参考资料。关键词： 可编程控制器（PLC） 热打印机 STEP7 AbstractThis text introduced the hot printer control system design the developme
3、nt the process, its the environment of development is a Windows, developping the tool is a SIMATIC, the company of Siemens is considerable to turn to weave the distance tool STEP7 5.0.The thesis discusses in details to analyze from the need, the possibility studies, the system of PLC designs, the pr
4、ocedure design method is detailed to design, hardware a whole the process of development for, and adjusting trying, the summary develops the experience in the process and improves the method follows the plait distance method of the programmable controller PLC.This system can proceed a control for fu
5、ll-automatic operation, changing before using after electric appliances to production line to the hot printer after developping the success, the automatic control dependable is high, the anti- interference ability is strong and break down low, take place after breaking down, can report to the police
6、 automatically, the procedure of PLC contain perfect diagnosis function with show the function, the procedure of PLC of the development can with the variety that craft request but the proceeding increase,s delete and modify etc. maintenance the operation is simple easy a target for, in industry auto
7、mate extensive usage PLC, passing PLC weaving distance to the equipments proceeding full-automatic control, increasing work efficiency with product quantity, decrease human resource, adopting can seeing turning weaving distance tool, making development procedure has the good man-machine interface, s
8、imple, use easily, convenient customer operation etc. characteristics, attain satisfy actual applied demand.The thesis described the process of development of the system from the angle of the software engineering, from the problem that plan the period the definition to has been arriving to develop t
9、he original procedure in period code to proceed the detailed introduction, this will for system from now on with craft request proceed the modification, support and further develop to provide the important reference.Keywords: Programmable controller( PLC), hot printer, STEP7 目 录绪论 1第一章 PLC的硬件组成及编程语言
10、概述 311 PLC的组成与基本结构 31.1.1 PLC的基本组成 31.1.2 PLC各组成部分 31.2 PLC编程语言描述 41.2.1 语句表编程概述 51.2.2 STEP7语句表指令及其结构简介 5第二章 问题与定义 82.1 引言 82.1.1 编写目的 82.1.2 背景 82.2 问题的提出 82.3 课题名称及问题描述 92.4 课题目标 9第三章 可行性研究 103.1.1 热打印机系统结构概述及控制原理进行可行性研究 103.1.2 热打印机动作说明 113.2 PLC控制热打印机不同工作过程 123.3 使用STEP7编程工具编写PLC程序的可行性分析 123.4 STEP7编程的开发环境及目标 13第四章 系统设计 144.1 可编程序控制器的系统设计 144.1.1 系统要求和过程或设备分解 154.1.2 创建功能说明书 154.1.3 设计安全回路 164.1.4 确定操作员站 164.1.5 确定PLC系统配置 17第五章 程序设计 195.1 引言 195.2 程序结构设计 195.2.1 线性程序结构 195.2.2 分部程序结构 205.2.3 结构化程序结构 205.3 数据结构设计 205.4 编程 215.5 程序调试
