【正文】 摸屏 變頻器 II Abstract Since thirty years ago to the introduction of PLC, the PLC has bee the basis of hundreds of thousands of control systems in a wide variety of industries. In many areas of production, often need to monitor the liquid level in the tank, tanks, pools and other containers, in the past using the traditional relay contactor control hardware used to connect multiple, poor reliability, and high degree of automation, the current many enterprises have advanced controller to transform the traditional controller, greatly improving the reliability and degree of automation of the control system to provide enterprises with a more reliable production. This article describes Nobukatsu XC3 programmable logic controller (PLC), the configuration software level control system design. System uses a PID algorithm to achieve automatic control of the level using the configuration software design manmachine interface, through the serial port and the programmable controller munication, realtime monitoring of the control system, field data acquisition and processing, its simple structure, the monitoring system is not only the degree of automation, but also has the online editing features and flexibility. Keywords: PLC level Control Touch Screen Inverter III 目錄 1 緒論 ....................................................... 1 的液位控制設(shè)計的背景 ....................................... 1 的液位控制設(shè)計的內(nèi)容 ....................................... 1 本課題設(shè)計的目的和意義 ........................................ 1 2 系統(tǒng)控制方案的確定 ........................................... 3 采用 PLC 控制液位的優(yōu)點 ........................................ 3 從控制速度上比較 .......................................... 3 從工作方式上比較 .......................................... 3 從可靠性，可維護性上比較 .................................. 3 系統(tǒng)設(shè)計的基本步驟 ............................................ 3 系統(tǒng)控制方案 .................................................. 4 3 系統(tǒng)硬件設(shè)計 ................................................ 6 可編程控制器（ PLC）的選型 ..................................... 6 如何選購 PLC 產(chǎn)品 .......................................... 6 的選型標(biāo)準(zhǔn) ............................................. 6 PLC 機型的選擇與特點 ...................................... 7 水泵選型 ...................................................... 9 變頻器選型 .................................................... 9 觸摸屏選型 ................................................... 10 觸摸屏的工作原理 ......................................... 11 觸摸屏的主要類型 ......................................... 11 觸摸屏的選擇 ............................................. 11 硬件接線圖 ................................................... 12 4 系統(tǒng)軟件設(shè)計 ............................................... 13 程序設(shè)計編程基本原則與注意問題 ............................... 13 程序設(shè)計（梯形圖）編程基本原則 ........................... 13 程序設(shè)計注意問題 ......................................... 13 所用編程軟件特點及界面操作 ................................... 13 編程軟件特點 ............................................. 13 信捷 XCPPro 編程軟件操作 .................................. 14 變頻器參數(shù)定 ................................................. 14 觸摸屏程序 ................................................... 14 屏幕保護畫面 ............................................. 14 操作畫面 ................................................. 14 參數(shù)設(shè)置畫面 ............................................. 15 結(jié)論 ........................................................ 16 致謝 ........................................................ 17 參考文獻 ..................................................... 18 IV 附錄一 系統(tǒng)硬件電路圖 ......................................... 19 2 1 緒 論 PLC 的液位控制設(shè)計的背景 20 世紀(jì) 20 年代起 ,人們把各種繼電器 ?定時器 ?接觸器及其觸點按一定的邏輯關(guān)系連接起來組成控制系統(tǒng) ,控制各種生產(chǎn)機械 ,這就是大家所熟悉的傳統(tǒng)繼電接觸器控制系統(tǒng) ?由于它結(jié)構(gòu)簡單 ,容易掌握 ,價格便宜 ,在一定范圍內(nèi)能滿足控制要求 ,因而使用面甚廣 ,在工業(yè)控制領(lǐng)域中一直占主導(dǎo)地位 ?但是繼電接觸器控制系統(tǒng)有明顯的缺點 :設(shè)備體積大 ,可靠性差 ,動作速度慢 ,功能少 ,難與實現(xiàn)較復(fù)雜