【正文】 an be realized much more precise and very suits the control of water level. It will relay the traditional control technology, puter and munication technologies together with the control, and operation of flexible convenient, high reliability, suitable for continuous longterm characteristics of the work, very suitable for liquid level control requirements.This thesis mainly introduces a design of water level control system with intelligent measuring appliance,SIMATIC programmable logic controller (PLC) and configuration soft. This system adopts increment type ProportionalIntegralDifferential arithmetic to realize the water level automation. For convenience to monitor the system and process data in actual time, we have designed Human Machine Interface（HMI）with configuration soft. The result of experimentation indicates that this system could run quickly, accurately and stably which accords with our aim perfectly. This system has been used widely in the temperature control system field for its low cost and high stabilization advantages. Experiment proved that the control system more satisfactory results, with more practical engineering value. Keywords: Water Level Control；Intelligent measuring appliance ；PLC；PID；HMI ii ii目 錄摘 要 .................................................................................................................................................................IABSTRACT ......................................................................................................................................................II第一章 前言 ................................................................................................................................................1 課題研究背景、意義和目的 ......................................................................................1 液位控制系統(tǒng)的發(fā)展?fàn)顩r ..........................................................................................1 論文研究內(nèi)容 ..............................................................................................................2第二章 智能儀表與可編程控制器基礎(chǔ) ....................................................................................................4 智能儀表基礎(chǔ) ..............................................................................................................4 智能儀表的定義及發(fā)展現(xiàn)狀 ....................................4 智能儀表的功能 ..............................................4 智能儀表的基本組成 ..........................................4 可編程控制器基礎(chǔ) ......................................................................................................5 PLC 的歷史和發(fā)展趨勢 .........................................6 PLC 的分類 ...................................................6 PLC 的基本結(jié)構(gòu) ...............................................7 PLC 的編程 ...................................................8 S7300 型 PLC 的特性 ..........................................8第三章 PID 控制器設(shè)計 ...........................................................................................................................10 PID 控制器 ................................................................................................................10 PID 控制器的基本結(jié)構(gòu) ........................................10 PID 控制器各參數(shù)的作用 ......................................11 過程控制中常見 PID 參數(shù)整定方法 .............................12 PID 參數(shù)整定公式 ............................................14 數(shù)學(xué)模型 ...................................................................................................................15第四章 控制系統(tǒng)設(shè)計 ..............................................................................................................................18 硬件配置 ...................................................................................................................18 智能儀表 ...................................................18 PLC ........................................................19 檢測裝置 ...................................................20 執(zhí)行機構(gòu) ...................................................20 控制流程 ...................................................................................................................21 智能儀表控制 ...............................................21 S7300PLC 控制 ..............................................22 iii iii PLC 程序設(shè)計簡介 ....................................................................................................23 PID 功能 ....................................................23 控制程序設(shè)計 ...............................................26 程序總體結(jié)構(gòu) ...............................................27 STEP7 編程界面簡介 ..............................................................................................28 MATLAB 系統(tǒng)仿真 .................................................................................................30第五章 人機界面設(shè)計 .....................................................................................................................................32 組態(tài)軟件簡介 ............................................................................................................32 組態(tài)王人機界面開發(fā) ................................................................................................33 組態(tài)王簡介 .................................................33 組態(tài)王特點 .................................................33 組態(tài)王開發(fā) .................................................34第六章 系統(tǒng)運行結(jié)果 .....................................................................................................................................43第七章 結(jié)論 .....................................................................................................................................................44參考文獻(xiàn) ...........................................................................................................................................................45致謝 ..............................