廈門仲鑫航自動化設(shè)備有限公司
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產(chǎn)品型號6SE7038-6GL84-1JA1
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更新時間:2018-05-14 09:00:00瀏覽次數(shù):240次
聯(lián)系我時,請告知來自 儀表網(wǎng)SIEMENS 6SE7038-6GL84-1JA1
SIEMENS 6SE7038-6GL84-1JA1
SIEMENS 6SE7038-6GL84-1JA1
SIEMENS 6SE7038-6GL84-1JA1
1.1 一般DCS的體系結(jié)構(gòu)
20世紀70年代中期以來過程計算機控制系統(tǒng)的發(fā)展進入以采用4C技術(shù)(計算機、通信、控制、CRT顯示技術(shù))為特征的集散型控制系統(tǒng)(DCS)的發(fā)展時期。從系統(tǒng)結(jié)構(gòu)分析DCS可分為三大基本部分:分散過程控制裝置部分、集中操作和管理系統(tǒng)部分以及通信系統(tǒng)部分。三部分的關(guān)系如圖1所示。
功能分層是DCS的體系特征,它充分反映了集散控制系統(tǒng)的分散控制與集中管理的特點。按照功能分層的方法,多智能儀表控制系統(tǒng)可以分為現(xiàn)場控制站、過程控制站、控制級、生產(chǎn)管理站。
廈門仲鑫航自動化設(shè)備有限公司
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Nikon Plan 100x/1.25 160/0.17 oil microscope objective
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