描述

美國Bailey公司Network-90和INFI 90系統(tǒng)的工程師站，它有兩個軟件，一個是給控制器組態(tài)的，稱為CAD；另外一個是給操作站畫圖的軟件，稱為SLDG軟件。SLDG軟件很好，它與硬件的關(guān)系不大。Network-90和INFI 90系統(tǒng)的OIS25作圖，又能給OIS1X、OIS4X操作站作圖。這幾種操作站的硬件都不同，如OIS25是專用硬件，OIS1X是PC機(jī)，OIS4X是DEC的vax或Alpha機(jī)，且操作系統(tǒng)也不一樣。它們分別是專用操作系統(tǒng)、QNX和VMS，都能用SLDG軟件作圖。
1996年由于DEC公司被Compaq公司兼并，2000年Compaq公司又被HP兼并。Network-90和INFI 90系統(tǒng)買不到合適的機(jī)器作為操作站主機(jī)，Bailey公司采用PC機(jī)作為操作站主機(jī)，它就是ConductorNT操作站，但它沒有繼承這個優(yōu)點，而是另起爐灶，作圖必須一筆一筆地畫。有一個電廠，要將INFI 90系統(tǒng)的原OIS25操作站更換為ConductorNT操作站，一共有40幅流程圖，200條趨勢曲線，140幅文本畫面，完成該任務(wù)需要18個人*月。如能把老操作站的圖形用軟件轉(zhuǎn)換，只要幾十秒鐘，轉(zhuǎn)換完成以后，可能還會有一些不太符合要求的地方，在這個基礎(chǔ)上進(jìn)行修改，時間就會節(jié)省很多，大約需要一個人*月。由此可見，采用這種標(biāo)準(zhǔn)化的方式操作，工作量減少是巨大的。
需要制訂標(biāo)準(zhǔn)的另外一個原因是操作站軟件呈多元化趨勢，有像iFIX、InTouch、組態(tài)王這種類型的，還有SL-GSM這樣的軟件，它已經(jīng)用上XML的編程方法。還有，現(xiàn)在數(shù)據(jù)庫的功能在進(jìn)一步擴(kuò)大，如神經(jīng)元網(wǎng)絡(luò)的算法已經(jīng)包括在數(shù)據(jù)庫中；還有OPC之間的數(shù)據(jù)交換等，都要求有一個編程標(biāo)準(zhǔn)。編程標(biāo)準(zhǔn)靠一個公司是無法制訂完成的，需要國際社會共同努力完成。

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