HCS04.2E-W1040-A-05-NNNN
HCS04.2E-W1040-A-05-NNNN
在60年代,汽車生產(chǎn)流水線的自動(dòng)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(shí)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(jì)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(jì)和安裝,十分費(fèi)時(shí),費(fèi)工,費(fèi)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(xiàng)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(jì)算機(jī);
(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(dòng)電磁閥,接觸器等;
(9)在擴(kuò)展時(shí),原系統(tǒng)只要很小變更;
(10)用戶程序存儲器容量至少能擴(kuò)展到4K。
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