描述
DSAX452
隨著現(xiàn)場(chǎng)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(chǎng)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(chǎng)總線協(xié)議的現(xiàn)場(chǎng)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(gè)現(xiàn)場(chǎng)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(duì)于簡(jiǎn)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(chǎng)總線作用的網(wǎng)橋和集線器,操作站直接與現(xiàn)場(chǎng)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(diǎn)。FCS系統(tǒng)具有高度的分散性,它可以由現(xiàn)場(chǎng)設(shè)備組成自治的控制回路?,F(xiàn)場(chǎng)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(shí)診斷設(shè)備的運(yùn)行情況。另外,F(xiàn)CS的結(jié)構(gòu)比DCS簡(jiǎn)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(chǎng)儀表相連。這些使FCS的可靠性得到提高。
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