產(chǎn)品詳情
SVX020A1-4A1B1
SVX020A1-4A1B1
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。
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