產(chǎn)品詳情
PLC是如何產(chǎn)生的
在60年代，汽車生產(chǎn)流水線的自動控制系統(tǒng)基本上都是由繼電器控制裝置構(gòu)成的。當(dāng)時汽車的每一次改型都直接導(dǎo)致繼電器控制裝置的重新設(shè)計和安裝。隨著生產(chǎn)的發(fā)展，汽車型號更新的周期愈來愈短，這樣，繼電器控制裝置就需要經(jīng)常地重新設(shè)計和安裝，十分費時，費工，費料，甚至阻礙了更新周期的縮短。為了改變這一現(xiàn)狀，美國通用汽車公司在1969年公開招標(biāo)，要求用新的控制裝置取代繼電器控制裝置，并提出了十項招標(biāo)指標(biāo)，即：
(1）編程方便，現(xiàn)場可修改程序；
(2）維修方便，采用模塊化結(jié)構(gòu)；
(3）可靠性高于繼電器控制裝置；
(4）體積小于繼電器控制裝置；
(5）數(shù)據(jù)可直接送入管理計算機；
(6）成本可與繼電器控制裝置競爭；
(7）輸入可以是交流115V；
(8）輸出為交流115V，2A以上，能直接驅(qū)動電磁閥，接觸器等；
(9）在擴展時，原系統(tǒng)只要很小變更；
(10）用戶程序存儲器容量至少能擴展到4K。
1969年，美國數(shù)字設(shè)備公司（DEC）研制出第一臺PLC，在美國通用汽車自動裝配線上試用，獲得了成功。這種新型的工業(yè)控制裝置以其簡單易懂，操作方便，可靠性高，通用靈活，體積小，使用壽命長等一系列優(yōu)點，很快地在美國其他工業(yè)領(lǐng)域推廣應(yīng)用。到1971年，已經(jīng)成功地應(yīng)用于食品，飲料，冶金，造紙等工業(yè)。這一新型工業(yè)控制裝置的出現(xiàn)，也受到了世界其他國家的高度重視。1971日本從美國引進了這項新技術(shù)，很快研制出了日本第一臺PLC。1973年，西歐國家也研制出它們的第一臺PLC。我國從1974年開始研制。于1977年開始工業(yè)應(yīng)用。
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產(chǎn)品承諾:
原裝進口，優(yōu)勢價格，大量現(xiàn)貨。
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