气罐压力控制系统.doc

第 PAGE \* MERGEFORMAT 36 页 共 NUMPAGES \* MERGEFORMAT 37 页 河 南 工 业 职 业 技 术 学 院 毕 业 论 文 河 南 工 业 职 业 技 术 学 院 Henan Polytechnic Institute 毕业设计（论文） 题 目＿气罐压力控制系统＿ 班 级＿＿＿ 姓 名＿＿＿＿＿＿ 指导教师＿＿＿＿＿＿ 摘要 随着人民生活水平的提高和国家能源结构的调整，煤气、液化气、天然气正逐步进入千家万户，然而，在存储、运输、使用过程中都用到了气罐并存在不同程度的危险，有可能对人民群众的人身安全和财产安全造成相当大的危害。因此，对气罐压力控制系统的研究具有十分重要的意义。 本设计由压力传感器、信号调理电路、A/D转换电路、D/A转换电路、电机驱动电路、PLC及监控组态组成。该设计的目的是通过使用组态软件制作实时显示操作界面，收集从下位机（PLC）上传的实时采集各种压力数据、PLC送来的报警信号及各执行部件的状态信号，对数据进行算术、逻辑处理后，通过图形、动画的方式显示压力曲线、温度曲线、工艺流程、系统运行参数等信息，并通过该人机界面向PLC发送实时命令，及时控制现场设备。 关键词：压力传感器，压力控制，PLC，组态监控 Abstract With the improvement of peoples living standard and the national energy structure adjustment, coal gas, liquefied petroleum gas, natural gas is gradually enter thousands of households, however, in the storage, transportation, use process are used in the tank and varying degrees of risk, can have on peoples personal safety and property safety cause considerable harm. Therefore, the tank pressure control system research is of great significance. The design consists of a pressure sensor, a signal conditioning circuit, A / D conversion circuit, D / A conversion circuit, a motor drive circuit, PLC and configuration. The design is through the use of configuration software real-time display operation interface, collected from the lower position machine ( PLC ) upload real-time acquisition of various pressure data, PLC sends alarm signals and each executive component status signal, the data processing arithmetic, logic, through graphics, animation to show the way to pressure curve, temperature curve, process, system operation parameters and other information, and through the man-machine interface for PLC to send real-time command, to control the field device. Key words: pressure sensor, pressure control, PLC, configuration monitoring 目录 TOC \o 1-3 \h \u HYPERLINK \l _Toc17985 第一章 绪论 PAGEREF _Toc17985 4 HYPERLINK \l _Toc28855 1.1研究的目的和意义 PAGEREF _Toc28855 4 HYPERLINK \l _Toc17782 1.2 PLC及其控制在国内外的发