描述
具體比較:
(1)DCS系統(tǒng)是個(gè)大系統(tǒng),其控制器功能強(qiáng)而且在系統(tǒng)中的作用十分重要,數(shù)據(jù)公路更是系統(tǒng)的關(guān)鍵,所以,必須整體投資一步到位,事后的擴(kuò)容難度較大。而FCS功能下放較徹底,信息處理現(xiàn)場(chǎng)化,數(shù)字智能現(xiàn)場(chǎng)裝置的廣泛采用,使得控制器功能與重要性相對(duì)減弱。因此,F(xiàn)CS系統(tǒng)投資起點(diǎn)低,可以邊用、邊擴(kuò)、邊投運(yùn)。
(2)DCS系統(tǒng)是封閉式系統(tǒng),各公司產(chǎn)品基本不兼容。而FCS系統(tǒng)是開(kāi)放式系統(tǒng),用戶(hù)可以選擇不同廠(chǎng)商、不同品牌的各種設(shè)備連入現(xiàn)場(chǎng)總線(xiàn),達(dá)到最佳的系統(tǒng)集成。
(3)DCS系統(tǒng)的信息全都是二進(jìn)制或模擬信號(hào)形成的,必須有D/A與A/D轉(zhuǎn)換。而FCS系統(tǒng)是全數(shù)字化,就免去了D/A與A/D變換,高集成化高性能,使精度可以從±0.5%提高到±0.1%。
(4)FCS系統(tǒng)可以將PID閉環(huán)控制功能裝入變送器或執(zhí)行器中,縮短了控制周期,目前可以從DCS的每秒2~5次,提高到FCS的每秒10~20次,從而改善調(diào)節(jié)性能。
(5)DCS它可以控制和監(jiān)視工藝全過(guò)程,對(duì)自身進(jìn)行診斷、維護(hù)和組態(tài)。但是,由于自身的致命弱點(diǎn),其I/O信號(hào)采用傳統(tǒng)的模擬量信號(hào),因此,它無(wú)法在DCS工程師站上對(duì)現(xiàn)場(chǎng)儀表(含變送器、執(zhí)行器等)進(jìn)行遠(yuǎn)方診斷、維護(hù)和組態(tài)。FCS采用全數(shù)字化技術(shù),數(shù)字智能現(xiàn)場(chǎng)裝置發(fā)送多變量信息,而不僅僅是單變量信息,并且還具備檢測(cè)信息差錯(cuò)的功能。FCS采用的是雙向數(shù)字通信現(xiàn)場(chǎng)總線(xiàn)信號(hào)制。因此,它可以對(duì)現(xiàn)場(chǎng)裝置(含變送器、執(zhí)行機(jī)構(gòu)等)進(jìn)行遠(yuǎn)方診斷、維護(hù)和組態(tài)。FCS的這點(diǎn)優(yōu)越性是DCS無(wú)法比擬的。
(6)FCS由于信息處理現(xiàn)場(chǎng)化,與DCS相比可以省去相當(dāng)數(shù)量的隔離器、端子柜、I/O終端、I/O卡件、I/O文件及I/O柜,同時(shí)也節(jié)省了I/O裝置及裝置室的空間與占地面積。有專(zhuān)家認(rèn)為可以省去60%。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢(shì)價(jià)格,大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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