A20B-1001-0730現(xiàn)貨;
A20B-1001-0730供應(yīng)。
數(shù)字量控制
實際的物理量,除了開關(guān)量、模擬量,還有數(shù)字量。如機(jī)床部件的位移,常以數(shù)字量表示。
數(shù)字量的控制,有效的辦法是NC,即數(shù)字控制技術(shù)。這是50年代誕生于美國的基于計算機(jī)的控制技術(shù)。當(dāng)今已很普及,并也很完善。目前,先進(jìn)的金屬切削機(jī)床,數(shù)控化的比率已超過40%~80%,有的甚至更高。
PLC也是基于計算機(jī)的技術(shù),并日益完善。故它也完全可以用于數(shù)字量控制。
PLC可接收計數(shù)脈沖,頻率可高達(dá)幾k到幾十k赫茲??捎枚喾N方式接收這脈沖,還可多路接收。有的PLC還有脈沖輸出功能,脈沖頻率也可達(dá)幾十k。有了這兩種功能,加上PLC有數(shù)據(jù)處理及運(yùn)算能力,若再配備相應(yīng)的傳感器(如旋轉(zhuǎn)編碼器)或脈沖伺服裝置(如環(huán)形分配器、功放、步進(jìn)電機(jī)),則完全可以依NC的原理實現(xiàn)種種控制。
高、中檔的PLC,還開發(fā)有NC單元,或運(yùn)動單元,可實現(xiàn)點位控制。運(yùn)動單元還可實現(xiàn)曲線插補(bǔ),可控制曲線運(yùn)動。所以,若PLC配置了這種單元,則完全可以用NC的辦法,進(jìn)行數(shù)字量的控制。
新開發(fā)的運(yùn)動單元,甚至還發(fā)行了NC技術(shù)的編程語言,為更好地用PLC進(jìn)行數(shù)字控制提供了方便。
27) 愛從無中生出,恨由愛中而起,天明愛得纏綿緋惻,天黑愛情便已死亡。
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