西門子PLC公司生產(chǎn)的可編程序控制器，產(chǎn)品包括LOGO、S7-200、S7-1200、S7-300、S7-400等，具備體積小、速度快、標(biāo)準(zhǔn)化的特點(diǎn)，PLC可分為微型PLC（如S7-200），小規(guī)模性能要求的PLC（如S7-300）和中、高性能要求的PLC（如S7-400）等。PLC采用梯形圖、布爾助記符、功能表圖、功能模塊和語句描述編程語言，其不需要大量的活動元件和連線電子元件，編程簡單，有較高的易操作性，能自動診斷，維修容易。
1．SIMATICS7-200PLCS7-200PLC是超小型化的PLC，它適用于各行各業(yè)，各種場合中的自動檢測、監(jiān)測及控制等。S7-200PLC的強(qiáng)大功能使其無論單機(jī)運(yùn)行，或連成網(wǎng)絡(luò)都能實(shí)現(xiàn)復(fù)雜的控制功能。S7-200PLC可提供4個(gè)不同的基本型號與8種CPU可供選擇使用。
2．SIMATICS7-300PLCS7-300是模塊化小型PLC系統(tǒng)，能滿足中等性能要求的應(yīng)用。各種單獨(dú)的模塊之間可進(jìn)行廣泛組合構(gòu)成不同要求的系統(tǒng)。與S7-200PLC比較，S7-300PLC采用模塊化結(jié)構(gòu)，具備高速（0.6~0.1μs）的指令運(yùn)算速度；用浮點(diǎn)數(shù)運(yùn)算比較有效地實(shí)現(xiàn)了更為復(fù)雜的算術(shù)運(yùn)算；一個(gè)帶標(biāo)準(zhǔn)用戶接口的軟件工具方便用戶給所有模塊進(jìn)行參數(shù)賦值；方便的人機(jī)界面服務(wù)已經(jīng)集成在S7-300操作系統(tǒng)內(nèi)，人機(jī)對話的編程要求大大減少
工業(yè)控制系統(tǒng)是對諸如圖像、語音信號等大數(shù)據(jù)量、高速率傳輸?shù)囊，又催生了?dāng)前在商業(yè)領(lǐng)域風(fēng)靡的
以太網(wǎng)與控制網(wǎng)絡(luò)的結(jié)合。這股工業(yè)控制系統(tǒng)網(wǎng)絡(luò)化浪潮又將諸如
嵌入式技術(shù)、多標(biāo)準(zhǔn)工業(yè)控制
網(wǎng)絡(luò)互聯(lián)、無線技術(shù)等多種當(dāng)今流行技術(shù)融合進(jìn)來，從而拓展了工業(yè)控制領(lǐng)域的發(fā)展空間，帶來新的發(fā)展機(jī)遇。
隨著
計(jì)算機(jī)技術(shù)、通信技術(shù)和控制技術(shù)的發(fā)展，傳統(tǒng)的控制領(lǐng)域正經(jīng)歷著一場前所未有的變革，開始向網(wǎng)絡(luò)化方向發(fā)展。
控制系統(tǒng)的結(jié)構(gòu)從最初的CCS（計(jì)算機(jī)集中控制系統(tǒng)），到第二代的DCS（分散控制系統(tǒng)），發(fā)展到現(xiàn)在流行的FCS（現(xiàn)場總線控制系統(tǒng)）
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