1756-CNB 1756-CNB A-B *
1756-CNB 1756-CNB A-B *
4. PLC的國內(nèi)外狀況
在工業(yè)生產(chǎn)過程中,大量的開關(guān)量順序控制,它按照邏輯條件進(jìn)行順序動(dòng)作,并按照邏輯關(guān)系進(jìn)行連鎖保護(hù)動(dòng)作的控制,及大量離散量的數(shù)據(jù)采集。傳統(tǒng)上,這些功能是通過氣動(dòng)或電氣控制系統(tǒng)來實(shí)現(xiàn)的。1968年美國GM(通用汽車)公司提出取代繼電氣控制裝置的要求,第二年,美國數(shù)字設(shè)備公司(DEC)研制出了基于集成電路和電子技術(shù)的控制裝置,采用程序化的手段應(yīng)用于電氣控制,這就是*代可編程序控制器,稱Programmable ,是*的*臺(tái)PLC.
限于當(dāng)時(shí)的元器件條件及計(jì)算機(jī)發(fā)展水平,早期的PLC主要由分立元件和中小規(guī)模集成電路組成,可以完成簡單的邏輯控制及定時(shí)、計(jì)數(shù)功能。20世紀(jì)70年代初出現(xiàn)了微處理器。人們很快將其引入可編程控制器,使PLC增加了運(yùn)算、數(shù)據(jù)傳送及處理等功能,完成了真正具有計(jì)算機(jī)特征的工業(yè)控制裝置。為了方便熟悉繼電器、接觸器系統(tǒng)的工程技術(shù)人員使用,可編程控制器采用和繼電器電路圖類似的梯形圖作為主要編程語言,并將參加運(yùn)算及處理的計(jì)算機(jī)存儲(chǔ)元件都以繼電器命名。此時(shí)的PLC為微機(jī)技術(shù)和繼電器常規(guī)控制概念相結(jié)合的產(chǎn)物。個(gè)人計(jì)算機(jī)(簡稱PC)發(fā)展起來后,為了方便,也為了反映可編程控制器的功能特點(diǎn),可編程序控制器定名為Programmable Logic Controller(PLC)。
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1336F-BRF75-AN-EN-HAS2
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1336F-B020-AN-EN-HAS2
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1336F-B030-AN-EN-HAS2
1336F-B040-AN-EN-HAS2
1336F-B050-AN-EN-HAS2
1336F-B060-AN-EN-HAS2
1336F-B075-AN-EN-HAS2
1336F-B100-AN-EN-HAS2
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1336F-BPR400-AN-EN-HAS2-CM
1336F-BPR400-AN-EN-HAS2-NCM
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1336F-BP450-AN-EN-HAS2-NCM
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1336F-BRF20-AA-EN
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1336F-BRF50-AA-EN
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1336F-BRF100-AA-EN
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1336F-B030-AA-EN
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