3HAC025729-001
3HAC025729-001
3HAC025729-001
PC控制的新希望是Windows CE操作系統(tǒng)。其占用空間非常小，有實(shí)時(shí)性能。工業(yè)界已經(jīng)看到WinCE的產(chǎn)品。
區(qū)別不同之處
有關(guān)PC控制最著名的成功案例大多來自于底特律的通用汽車Powertrain制造基地。在那里，分布在十幾個(gè)工廠的超過300個(gè)PC每天工作在機(jī)器生產(chǎn)線。梯形邏輯PLC已經(jīng)完全消失，向Powertrain提供新機(jī)器的OEM必須符合PC控制指標(biāo)。
Nematron Corp公司的市場部經(jīng)理John Dunlap解釋說：“對于GM，關(guān)鍵的好處是PC所用的流程圖軟件！1986年由位于Warren 的Hydra-matic工廠首先引入。工程師對軟件的透明性和所提供高級診斷能力感到驚訝，宕機(jī)時(shí)間也大大較少。這個(gè)技術(shù)立即擴(kuò)展到其他工廠！暗菍(shí)際很難準(zhǔn)確得到時(shí)間較少的數(shù)值。因?yàn)镻owertrain把它作為主要的競爭優(yōu)勢而籠罩著神秘氣氛。”Dunlap說。
Nematron在1994從FloPro的發(fā)明人Ron Lavallee那里得到該軟件，使其運(yùn)行在Windows NT下，并且增加了自己的HyperKernel程序，可把NT分成250微秒間隔的時(shí)間片斷，以保證實(shí)時(shí)響應(yīng)！氨简vIII在250微秒內(nèi)可以處理4,000個(gè)I/O，” Dunlap說。流程圖軟件與Nematron堅(jiān)固的工業(yè)PC相結(jié)合在Powertrain已經(jīng)被廣泛接受。
另一個(gè)位于Ann Arbor---美國流程圖軟件中心的Entivity，是先前的Steeplechase Software公司、Think and Do公司合并而來，F(xiàn)在部分由Schneider Electric公司所有。工業(yè)經(jīng)驗(yàn)豐富的Ken Spenser先生在Texas Instruments工業(yè)自動(dòng)化部門出售給Siemens之前曾經(jīng)領(lǐng)導(dǎo)該部門，擔(dān)任總裁兼CEO。雖然Entivity的兩個(gè)軟件產(chǎn)品Entivity Studio和Visual Logic Controller的由來不同，它們都是基于流程圖，并且進(jìn)入各種行業(yè)的數(shù)百個(gè)不同的應(yīng)用中。Entivity的網(wǎng)站(www.entivity.com) 有特別好的內(nèi)容說明流程圖軟件的強(qiáng)大功能和在各種工業(yè)的應(yīng)用。
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