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。
在存儲容量方面,有的PLC最高可達幾十兆字節(jié)。為了擴大存儲容量,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。
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、遠程I/O模塊、通信和人機接口模塊等。這些帶CPU和存儲器的智能I/O模塊,既擴展了PLC功能,又使用靈活方便,擴大了PLC應(yīng)用范圍。
加強PLC聯(lián)網(wǎng)通信的能力,是PLC技術(shù)進步的潮流。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與計算機之間的聯(lián)網(wǎng)通信,一般PLC都有專用通信模塊與計算機通信。為了加強聯(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準,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編程語言、面向過程控制的流程圖語言、與計算機兼容的高級語言(BASIC、C語言等)等。多種編程語言的并存、互補與發(fā)展是PLC進步的一種趨勢。
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