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IC697ALG444

IC697ALG444

IC697ALG444

組態(tài)軟件是指一些數(shù)據(jù)采集與過程控制的專用軟件，它們是在自動(dòng)控制系統(tǒng)監(jiān)控層一級(jí)的軟件平臺(tái)和開發(fā)環(huán)境，使用靈活的組態(tài)方式，為用戶提供快速構(gòu)建工業(yè)自動(dòng)控制系統(tǒng)監(jiān)控功能的、通用層次的軟件工具。組態(tài)軟件應(yīng)該能支持各種工控設(shè)備和常見的通信協(xié)議，并且通常應(yīng)提供分布式數(shù)據(jù)管理和網(wǎng)絡(luò)功能。組態(tài)（configuration）意思就是模塊的任意組合，采用組態(tài)技術(shù)構(gòu)成的計(jì)算機(jī)系統(tǒng)在硬件設(shè)計(jì)上，除采用工業(yè)PC機(jī)外，系統(tǒng)大量采用各種成熟通用的I/O接口設(shè)備和現(xiàn)場(chǎng)設(shè)備，基本不再需要單獨(dú)進(jìn)行具體電路設(shè)計(jì)。這不僅節(jié)約了硬件開發(fā)時(shí)間，更提高了工控系統(tǒng)的可靠性。在軟件設(shè)計(jì)上由于采用成熟的工控開發(fā)的工具軟件，它為用戶提供了多種通用工具模塊，用戶不需要掌握太多的編程語言技術(shù)（甚至不需要編程技術(shù)），就能很好地完成一個(gè)復(fù)雜工程所要求的所有功能。
工控組態(tài)軟件集成了圖形技術(shù)、人機(jī)界面技術(shù)、數(shù)據(jù)庫(kù)技術(shù)、控制技術(shù)、網(wǎng)絡(luò)與通信技術(shù)，使控制系統(tǒng)開發(fā)人員不必依靠某種具體的計(jì)算機(jī)語言，只需通過可視化的組態(tài)方式，就可完成監(jiān)控程序設(shè)計(jì)，降低了監(jiān)控程序開發(fā)的難度。組態(tài)軟件均具有良好的擴(kuò)展性、兼容性，軟件結(jié)構(gòu)開放，可接受各種形式的數(shù)據(jù)格式。同時(shí)，支持的硬件類型也十分廣泛[1]。工控組態(tài)軟件的出現(xiàn)，使得大型工業(yè)控制系統(tǒng)的組態(tài)編程變得十分得簡(jiǎn)單、容易，工程設(shè)計(jì)人員不用再設(shè)計(jì)那些復(fù)雜的應(yīng)用程序（如I/O driver等）。工控組態(tài)軟件的功能包括數(shù)據(jù)庫(kù)生成、歷史庫(kù)生成、圖形生成、報(bào)表生成、順序控制功能、連續(xù)調(diào)節(jié)功能。目前有許多工控組態(tài)軟件。例如：Intouch、Fix、Citech、WinCC、Controx(開物)、Force control(力控)、組態(tài)王。

四．恒壓供水系統(tǒng)介紹
下面以一個(gè)三臺(tái)泵生活/消防雙恒壓供水系統(tǒng)為例來說明其工藝過程（已做過簡(jiǎn)化），它主要是由PLC、變頻器、壓力傳感器、水泵斷路器、接觸器、中間繼電器以及水泵等組成。用戶通過控制柜上的指示操作面板上的指示燈、TD-200顯示屏及按鈕、轉(zhuǎn)換開關(guān)來了解和控制系統(tǒng)的運(yùn)行。如圖1-1所示，市網(wǎng)自來水用高低水位控制器EQ來控制注水閥YV1，它們自動(dòng)把水注滿儲(chǔ)水水池，只要水位低于高水位，則自動(dòng)往水箱內(nèi)注水。水池的高/低水位信號(hào)也接送給PLC，作為低水位報(bào)。通過安裝在出水管網(wǎng)上的遠(yuǎn)傳壓力傳感器將壓力信號(hào)轉(zhuǎn)化為4-20mA的標(biāo)準(zhǔn)信號(hào)送入PLC，經(jīng)PID運(yùn)算與給定壓力參數(shù)進(jìn)行比較，得出調(diào)節(jié)參數(shù)，送給變頻器，由變頻器控制水泵轉(zhuǎn)速，調(diào)節(jié)系統(tǒng)供水量，使系統(tǒng)的供水管網(wǎng)壓力保持在給定壓力上；當(dāng)用水量超過一臺(tái)泵的供水量時(shí)，通過PLC控制器加泵。根據(jù)用戶用水量的大小來控制工作泵數(shù)量的增減及變頻器對(duì)水泵的調(diào)速，實(shí)現(xiàn)恒壓供水。當(dāng)供水負(fù)載變化時(shí)，輸入電機(jī)的電壓和頻率也隨之變化，這樣就構(gòu)成了以壓力設(shè)定值為基準(zhǔn)的閉環(huán)控制系統(tǒng)[2]。

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Allen Bradley Pressure Switch 836T-T253JX130X15 used

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