描述

6SE7018-OEP50-Z

隨著現(xiàn)場總線技術(shù)的出現(xiàn)和成熟，促使了控制系統(tǒng)由集散控制系統(tǒng)（DCS）向現(xiàn)場總線控制系統(tǒng)（FCS）的過渡。在一般的FCS系統(tǒng)中，遵循一定現(xiàn)場總線協(xié)議的現(xiàn)場儀表可以組成控制回路，使控制站的部分控制功能下移分散到各個現(xiàn)場儀表中。從而減輕了控制站負(fù)擔(dān)，使得控制站可以專職于執(zhí)行復(fù)雜的高層次的控制算法。對于簡單的控制應(yīng)用，甚至可以把控制站取消，在控制站的位置代之以起連接現(xiàn)場總線作用的網(wǎng)橋和集線器，操作站直接與現(xiàn)場儀表相連，構(gòu)成分布式控制系統(tǒng)。分布式的FCS系統(tǒng)比DCS系統(tǒng)更好地體現(xiàn)了“信息集中，控制分散”的思想。與傳統(tǒng)的DCS相比，F(xiàn)CS有其自身的特點。FCS系統(tǒng)具有高度的分散性，它可以由現(xiàn)場設(shè)備組成自治的控制回路。現(xiàn)場儀表或設(shè)備具有高度的智能化與功能自主性，可完成控制的基本功能，并可以隨時診斷設(shè)備的運行情況。另外，F(xiàn)CS的結(jié)構(gòu)比DCS簡化。有的FCS系統(tǒng)省略了DCS中控制站這一層，操作站直接與現(xiàn)場儀表相連。這些使FCS的可靠性得到提高?，F(xiàn)場總線系統(tǒng)具有開放性。系統(tǒng)對相關(guān)標(biāo)準(zhǔn)具有一致性、公開性，強調(diào)對標(biāo)準(zhǔn)的共識與遵從。通信協(xié)議一致公開，各不同廠家的設(shè)備之間可實現(xiàn)信息交換，通過現(xiàn)場總線可構(gòu)筑自動化領(lǐng)域的開放互連系統(tǒng)。系統(tǒng)的開放性決定了它具有互操作性和互用性。互操作性指互連設(shè)備間、系統(tǒng)間信息傳送與溝通；而互用則意味著不同生產(chǎn)廠家的性能類似的設(shè)備可實現(xiàn)相互替換。作為工廠網(wǎng)絡(luò)底層的現(xiàn)場總線還對現(xiàn)場環(huán)境有較強地適應(yīng)性。它支持雙絞線、同軸電纜、光纜、無線和電力線等，具有較強的抗干擾能力。
由于結(jié)構(gòu)上的改變，F(xiàn)CS比DCS更節(jié)約硬件設(shè)備。使用FCS可以減少大量的隔離器、端子柜、I/O卡及I/O端口，這樣就節(jié)省了I/O裝置及裝置室的空間；同時減少了大量電纜，可以極大地節(jié)省安裝費用。與此同時，F(xiàn)CS比DCS性能有所提高。由于免去了D/A與A/D變換，使儀表精度得到極大的提高；通過將PID功能植入到相應(yīng)的智能傳感器中去，使控制周期大為縮短。目前FCS可以從DCS的每秒調(diào)節(jié)2～5次增加到每秒調(diào)節(jié)10～20次，改善了調(diào)節(jié)性能。FCS控制系統(tǒng)與DCS控制系統(tǒng)結(jié)構(gòu)比較見圖

產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準(zhǔn)時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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