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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。

***********************************

產(chǎn)品承諾:

原裝進口，優(yōu)勢價格，大量現(xiàn)貨。

承諾一：1、絕對保證全新原裝進口

承諾二：2、絕對保證安全準時發(fā)貨

承諾三：3、絕對保證售后服務(wù)質(zhì)量

流程一：1、客戶確認所需采購產(chǎn)品型號

流程二：2、我方會根據(jù)詢價單型號查詢價格以及交貨期，擬一份詳細正規(guī)報價單

流程三：3，客戶收到報價單并確認型號無誤后訂購產(chǎn)品

流程四：4、報價單負責(zé)人根據(jù)客戶提供型號以及數(shù)量擬份銷售合同

流程五：5、客戶收到合同查閱同意后蓋章回傳并按照合同銷售額匯款到公司開戶行

流程六：6、我公司財務(wù)查到款后，業(yè)務(wù)員安排發(fā)貨并通知客戶跟蹤運單

━━━━━━━━━━━━━━━━━━━━━━━━━

★聯(lián)系人：鄭順輝★ Q Q ： 3008619103 ★

★ 手機：15359267724（微信同號） ★

★郵箱：3008619103@qq.com ★

★地址：廈門市集美區(qū)軟件園三期B02棟1201室 ★

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