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1203-FM1

1203-FM1

1203-FM1

   1．向高速度、大容量方向發(fā)展

 為了提高PLC的處理能力，要求PLC具有更好的響應(yīng)速度和更大的存儲容量。目前，有的PLC的掃描速度可達(dá)0.1ms/k步左右。PLC的掃描速度已成為很重要的一個性能指標(biāo)。

 在存儲容量方面，有的PLC最高可達(dá)幾十兆字節(jié)。為了擴(kuò)大存儲容量，有的公司已使用了磁泡存儲器或硬盤。

    2．向超大型、超小型兩個方向發(fā)展

 當(dāng)前中小型PLC比較多，為了適應(yīng)市場的多種需要，今后PLC要向多品種方向發(fā)展，特別是向超大型和超小型兩個方向發(fā)展�，F(xiàn)已有I/O點數(shù)達(dá)14336點的超大型PLC，其使用32位微處理器，多CPU并行工作和大容量存儲器，功能強(qiáng)。

 小型PLC由整體結(jié)構(gòu)向小型模塊化結(jié)構(gòu)發(fā)展，使配置更加靈活，為了市場需要已開發(fā)了各種簡易、經(jīng)濟(jì)的超小型微型PLC，最小配置的I/O點數(shù)為8～16點，以適應(yīng)單機(jī)及小型自動控制的需要，如三菱公司α系列PLC。

    3．PLC大力開發(fā)智能模塊，加強(qiáng)聯(lián)網(wǎng)通信能力

 為滿足各種自動化控制系統(tǒng)的要求，近年來不斷開發(fā)出許多功能模塊，如高速計數(shù)模塊、溫度控制模塊、遠(yuǎn)程I/O模塊、通信和人機(jī)接口模塊等。這些帶CPU和存儲器的智能I/O模塊，既擴(kuò)展了PLC功能，又使用靈活方便，擴(kuò)大了PLC應(yīng)用范圍。

加強(qiáng)PLC聯(lián)網(wǎng)通信的能力，是PLC技術(shù)進(jìn)步的潮流。PLC的聯(lián)網(wǎng)通信有兩類：一類是PLC之間聯(lián)網(wǎng)通信，各PLC生產(chǎn)廠家都有自己的專有聯(lián)網(wǎng)手段；另一類是PLC與計算機(jī)之間的聯(lián)網(wǎng)通信，一般PLC都有專用通信模塊與計算機(jī)通信。為了加強(qiáng)聯(lián)網(wǎng)通信能力，PLC生產(chǎn)廠家之間也在協(xié)商制訂通用的通信標(biāo)準(zhǔn)，以構(gòu)成更大的網(wǎng)絡(luò)系統(tǒng)，PLC已成為集散控制系統(tǒng)（DCS）不可缺少的重要組成部分。

     4．增強(qiáng)外部故障的檢測與處理能力

     根據(jù)統(tǒng)計資料表明：在PLC控制系統(tǒng)的故障中，CPU占5%，I/O接口占15%，輸入設(shè)備占45%，輸出設(shè)備占30%，線路占5%。前二項共20%故障屬于PLC的內(nèi)部故障，它可通過PLC本身的軟、硬件實現(xiàn)檢測、處理；而其余80%的故障屬于PLC的外部故障。因此，PLC生產(chǎn)廠家都致力于研制、發(fā)展用于檢測外部故障的專用智能模塊，進(jìn)一步提高系統(tǒng)的可靠性。

    5．編程語言多樣化

  在PLC系統(tǒng)結(jié)構(gòu)不斷發(fā)展的同時，PLC的編程語言也越來越豐富，功能也不斷提高。除了大多數(shù)PLC使用的梯形圖語言外，為了適應(yīng)各種控制要求，出現(xiàn)了面向順序控制的步進(jìn)編程語言、面向過程控制的流程圖語言、與計算機(jī)兼容的高級語言（BASIC、C語言等）等。多種編程語言的并存、互補(bǔ)與發(fā)展是PLC進(jìn)步的一種趨勢。

福州卓凱電子科技有限公司
24小時銷售技術(shù)服務(wù)熱線 ：17705012279;0591-62182535
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聯(lián)系人： 林工（ 銷售工程師 ）
地址：福州市閩侯西江濱大道77號正榮潤園一號樓1205室

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