DASD105/3ASC25H285

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　2 三大控制系統(tǒng)之間的差異

　　2.1 差異

　　2.1.1 DCS或PLC

　　PLC系統(tǒng)與DCS系統(tǒng)的結(jié)構(gòu)差異不大，只是在功能的著重點(diǎn)上的不同，DCS著重于閉環(huán)控制及數(shù)據(jù)處理。PLC著重于邏輯控制及開關(guān)量的控制，也可實(shí)現(xiàn)模擬量控制。

　　DCS或PLC系統(tǒng)的關(guān)鍵是通信。也可以說數(shù)據(jù)公路是分散控制系統(tǒng)DCS及PLC的脊柱。由于它的任務(wù)是為系統(tǒng)所有部件之間提供通信網(wǎng)絡(luò)，因此，數(shù)據(jù)公路自身的設(shè)計(jì)就決定了總體的靈活性和安全性。數(shù)據(jù)公路的媒體可以是：一對(duì)絞線、同軸電纜或光纖電纜。

　　DCS的特點(diǎn)是：

（1）控制功能強(qiáng)?？蓪?shí)現(xiàn)復(fù)雜的控制規(guī)律，如串級(jí)、前饋、解耦、自適應(yīng)、最優(yōu)和非線性控制等。也可實(shí)現(xiàn)順序控制。

（2）系統(tǒng)可靠性高。

（3）采用CRT操作站有良好的人機(jī)界面。

（4）軟硬件采用模塊化積木式結(jié)構(gòu)。

（5）系統(tǒng)容易開發(fā)。

（6）用組態(tài)軟件，編程簡(jiǎn)單，操作方便。

（7）有良好的性價(jià)比。

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【..美國(guó)..英維思 Invensys FOXBORO IA系統(tǒng), Triconex ESD系統(tǒng)】

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【施耐德，?？怂共_，艾默生，霍尼韋爾，西門子，西屋】

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woodward 9905-970

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