描述
這里的D,小型機(jī)多為8位二進(jìn)制數(shù),中、大型多為12位二進(jìn)制數(shù)。
A/D、D/A有單路,也有多路。多路占的輸入輸出繼電器多。
有了A/D、D/A單元,余下的處理都是數(shù)字量,這對(duì)有信息處理能力的PLC并不難。中、大型PLC處理能力更強(qiáng),不僅可進(jìn)行數(shù)字的加、減、乘、除,還可開(kāi)方,插值,還可進(jìn)行浮點(diǎn)運(yùn)算。有的還有PID指令,可對(duì)偏差制量進(jìn)行比例、微分、積分運(yùn)算,進(jìn)而產(chǎn)生相應(yīng)的輸出。計(jì)算機(jī)能算的它幾乎都能算。
這樣,用PLC實(shí)現(xiàn)模擬量控制是完全可能的。控制的單位值可小到212分之一的測(cè)量程值,多數(shù)也是足夠的。
PLC進(jìn)行模擬量控制,還有A/D、D/A組合在一起的單元,并可用PID或模糊控制算法實(shí)現(xiàn)控制,可得到很高的控制質(zhì)量。
用PLC進(jìn)行模擬量控制的好處是,在進(jìn)行模擬量控制的同時(shí),開(kāi)關(guān)量也可控制。這個(gè)優(yōu)點(diǎn)是別的控制器所不具備的,或控制的實(shí)現(xiàn)不如PLC方便。
當(dāng)然,若純?yōu)槟M量的系統(tǒng),用PLC可能在性能價(jià)格比上不如用調(diào)節(jié)器。這也是應(yīng)當(dāng)看到的。
3.3用于運(yùn)動(dòng)控制
實(shí)際的物理量,除了開(kāi)關(guān)量、模擬量,還有運(yùn)動(dòng)控制。如機(jī)床部件的位移,常以數(shù)字量表示。
運(yùn)動(dòng)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(guó)的基于計(jì)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)國(guó)家的金屬切削機(jī)床,數(shù)控化的比率已超過(guò)40%~80%,有的甚至更高。
PLC也是基于計(jì)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(jì)數(shù)脈沖,頻率可高達(dá)幾k到幾十k赫茲。可用多種方式接收這脈沖,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(shí)現(xiàn)種種控制。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè),ACSO,力士樂(lè)等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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