【正文】 gn, the level of data collection, processing, output processing, the liquid level in the realtime monitoring, automatic / manual bumpless switching, alarm display and other functions. This thesis is divided into three parts. Briefly introduced the PACSystems RX3i Series PLC basic knowledge of the hardware module, working principle and ladder given PACSystems RX3i ladder programming and laboratory equipment configuration, and finally through the field bus (Ether bus) field devices and node connections. Level control system design. Keywords: level control。在簡(jiǎn)要介紹了 PACSystems RX3i 系列 PLC 的硬件模塊、工作原理和梯形圖等基礎(chǔ)知識(shí)上，給出了 PACSystems RX3i 梯形圖編程和實(shí)驗(yàn)設(shè)備的組態(tài)，最后通過現(xiàn)場(chǎng)總線（以太網(wǎng)總線）將現(xiàn)場(chǎng)設(shè)備和節(jié)點(diǎn)連接。在系統(tǒng)遠(yuǎn)程監(jiān)控方面，利用 IFIX 軟件進(jìn)行了遠(yuǎn)程監(jiān)控界面的設(shè)計(jì)，通過對(duì)液位數(shù)據(jù)的采集、處理、輸出處理，實(shí)現(xiàn)了對(duì)液位高度的實(shí)時(shí)監(jiān)控、自動(dòng)/手動(dòng)的無擾切換、報(bào)警顯示等功能。本設(shè)計(jì)采用了 PACSystems RX3i 控制器對(duì)水箱液位設(shè)備控制進(jìn)行了系統(tǒng)設(shè)計(jì)。PAC 系統(tǒng)是繼PLC、DCS 之后的新一代控制系統(tǒng)，綜合了計(jì)算機(jī)技術(shù)、自動(dòng)控制技術(shù)和通信技術(shù)的一種新型的、多功能控制器平臺(tái)，廣泛應(yīng)用工業(yè)控制領(lǐng)域。畢業(yè)設(shè)計(jì)（論文）基于 GE PACSystems RX3i 的水箱液位控制設(shè)摘 要液位控制是常見的工業(yè)過程控制之一，它廣泛運(yùn)用于水塔、鍋爐、高層建筑水箱、罐、工業(yè)化工槽等受壓容器的液位測(cè)量。隨著科技的進(jìn)步，人們對(duì)生產(chǎn)的控制精度要求越來越高，所以提高液位控制系統(tǒng)的性能顯得十分重要。因此我們很有必要對(duì)PAC RX3i 液位控制系統(tǒng)設(shè)計(jì)進(jìn)行研究。主控器采用 PACSystems RX3i 系列的 IC695CPU310 模塊，控制對(duì)象為實(shí)驗(yàn)室的水箱液位設(shè)備，采用以太網(wǎng)進(jìn)行通訊，用 PME 軟件完成了系統(tǒng)硬件配置，各個(gè)模塊的的梯形圖設(shè)計(jì)與調(diào)試，實(shí)現(xiàn)了任意液位高度的手動(dòng)/ 自動(dòng)調(diào)節(jié)。本論文分三部分。實(shí)現(xiàn)了液位控制系統(tǒng)的設(shè)計(jì)。 PACSystems RX3i 。Ether目 錄摘 要 ..............................................................................................................................IVAbstract..................................................................................................................................V目 錄 ....................................................................................................................................VI第 1 章 緒 論 ........................................................................................................................1 PLC 的發(fā)展及過程控制簡(jiǎn)介 ..................................................................................1 過程控制 ......................................................................................................2 液位控制系統(tǒng)的組成 ..................................................................................3 液位控制系統(tǒng)的功能 ..................................................................................3 研究意義及發(fā)展方向 .............................................................................................4 本論文的主要內(nèi)容與方法 .....................................................................................5 本論文的結(jié)構(gòu)安排 .................................................................................................5第 2 章 GE PACSystems RX3i 簡(jiǎn)介 ....................................................................................6 GE PACSystem 系列 PLC 概念 ..............................................................................6 PAC 概念的提出 ..........................................................................................6 PAC 特征 ......................................................................................................6 GE PACSystems ...........................................................................................7 GE PACSystems RX3i 的硬件結(jié)構(gòu) ........................................................................8 GE PACSystems RX3i 簡(jiǎn)介 .........................................................................8 GE PACSystems RX3i 基本模塊 .................................................................9 編程設(shè)備 ....................................................................................................11 GE PACSystems 系列 PLC 的工作原理 ..............................................................11 工作原理 .....................................................................................................11 CPU 掃描 ....................................................................................................11 梯形圖編程知識(shí) ...................................................................................................14 梯形圖的基本概念 ....................................................................................14 梯形圖的編程規(guī)則 ....................................................................................15 具有自鎖功能的程序梯形圖 ....................................................................16 編程環(huán)境 Proficy Machine Edition 簡(jiǎn)介 ............................................................16 Proficy Machine Edition 的安裝 ................................................................16 制作一個(gè)工程的一般過程 ........................................................................17第 3 章 組態(tài)軟件 iFix 簡(jiǎn)介 ................................................................................................19 iFix 功能 .................................................................................................................19 IFIX 的工作機(jī)制 .....................................................................................................19 IFIX 新建工程與配置 .............................................................................................19 工作臺(tái) ...................................................................................................................20 數(shù)據(jù)庫管理器 .......................................................................................................21第 4 章 基于 GE PAC RX3i 液位控制系統(tǒng)設(shè)計(jì) ..............................................................22 PID 理論知識(shí) .........................................................................................................22 PID 控制器 .................................................................................................22 模擬 PID 控制原理 ...................................................................................22 數(shù)字 PID 控制算法 ...................................................................................24 系統(tǒng)控制原理 .......................................................................................................25 硬件連接 ................................................................................................................25 軟件設(shè)計(jì) .........................