1746-IM4

1746-IM4

1746-IM4

  從圖3中可看出雙分布處理單元仲裁電路工作原理為將分布處理單元各自自身之診斷結(jié)果加到仲裁電路上，并讀取相應(yīng)的仲裁結(jié)果，以確定自身之主輔狀態(tài)。通過編程，確定各狀態(tài)的優(yōu)先級(jí)，由于雙分布處理單元均根據(jù)仲裁之結(jié)果確定各自之主輔狀態(tài)，故只要仲裁結(jié)果變化了，雙分布處理單元?jiǎng)t自動(dòng)進(jìn)行切換。 

4、網(wǎng)絡(luò)冗余

    在DCS控制系統(tǒng)中至少存在2個(gè)網(wǎng)絡(luò)，一個(gè)是管理層和控制層之間的通信網(wǎng)絡(luò)，另一個(gè)是過程控制層與底層I/O卡件層之間的485通信網(wǎng)絡(luò)。上層網(wǎng)絡(luò)主要的作用是實(shí)現(xiàn)管理層對(duì)控制層實(shí)時(shí)檢測(cè)，和對(duì)下層控制器的配置設(shè)置等任務(wù)。下層網(wǎng)絡(luò)是為了把I/O卡件采集的數(shù)據(jù)傳送到過程控制層，然后把控制層的控制數(shù)據(jù)傳送給I/O卡件。這2個(gè)網(wǎng)絡(luò)在DCS控制系統(tǒng)中的重要性是不言而喻的。

現(xiàn)貨，現(xiàn)貨，降降降，火火火，火火火……

現(xiàn)貨，現(xiàn)貨，降降降，火火火，火火火……

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◆ 企業(yè)名稱：廈門泰尼電氣有限公司

◆ 聯(lián)系人： 小廖（女士）

◆ 電話：0592-6539066
   
◆ 手機(jī)：18965113601 

◆ 傳真：0592-6890859

◆ QQ:1490371370

誠信經(jīng)營，質(zhì)量為首，服務(wù)至上，廈門泰尼小廖竭誠為您服務(wù)?。?！

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