各大PLC制造廠商,如西門子、 ROCKWELL automation、 GE Fanuc、 三菱電機(jī)均推出各自品牌的PCBCS 操控體系商品,其特點(diǎn)是操控器已改用PC機(jī)操控,它經(jīng)過操控總線或通信接口,與各公司原有的長(zhǎng)途I/O組件聯(lián)接,這表明PLC的出產(chǎn)廠商已接受PCBCS 操控的技能道路。位于美國(guó)新澤西州普林斯頓的西門子動(dòng)力和自動(dòng)化集團(tuán) ISBU基地開發(fā)的重點(diǎn)是根據(jù)PC的自動(dòng)化,它所推出的PCBCS中的操控器是SIMATIC WinAC(Windows自動(dòng)化基地),它徹底兼容SIMATIC S7系列PLC,能夠完結(jié)PLC的操控功能,其I/O接口運(yùn)用通信模塊聯(lián)接Profibus-DP,完成SoftPLC 操控。
在1995年由Wayson Industrial 公司提出的TCS(Tailored Control System,柔性操控體系)體系中有7種構(gòu)造型式,其間一種就是選用PC機(jī)直接帶現(xiàn)場(chǎng)的I/O模件,它用運(yùn)轉(zhuǎn)在PC機(jī)內(nèi)部的軟邏輯操控器替代操控器,用于收集點(diǎn)數(shù)較多但操控較少的場(chǎng)合。
美國(guó)Entivity公司(由Think & Do、Steeplechase公司合并而成)使用一種嵌入式操作體系Windows CE 與硬件廠商協(xié)作推出新型的PCBCS 商品--WinPLC,它是安裝在I/O基板上的小型PC機(jī),其間固化的Windows CE操作體系和Think & Do應(yīng)用軟件的Runtime 環(huán)境,能夠運(yùn)轉(zhuǎn)由一般PC機(jī)開發(fā)的Think & Do應(yīng)用程序,完成對(duì)同一基板上I/O模塊的操控。WinPLC體系能夠脫離開發(fā)PC機(jī)獨(dú)立運(yùn)轉(zhuǎn),適合于不需要監(jiān)控畫面并且規(guī)劃較小的操控體系;當(dāng)體系需要監(jiān)控畫面時(shí),也能夠?qū)⒁慌_(tái)裝有Think & Do軟件的計(jì)算機(jī)經(jīng)過以太網(wǎng)與WinPLC體系相連,以該計(jì)算機(jī)作為上位操作員站[7][9]。一些專家介紹,傳統(tǒng)的PLC具有硬實(shí)時(shí)特性,能夠確保I/O掃描周期及中止的呼應(yīng),PC選用的Windows NT/2000操作體系并不是實(shí)時(shí)體系,不能確保中止的呼應(yīng)時(shí)間或使命的履行周期確實(shí)定性。Windows CE 3.0的呈現(xiàn)使根據(jù)PC的操控在實(shí)時(shí)性方面更進(jìn)一步,乃至超過了任何PLC,可確保精確的讀寫周期和程序循環(huán)周期。
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