1747-L542/////1747-L542

1747-L542

1747-L542

1747-L542

 現(xiàn)場(chǎng)總線可以稱作是五代控制系統(tǒng)，打破了DCS系統(tǒng)被束縛于通信專用網(wǎng)絡(luò)的局面，形成了新型全分布式結(jié)構(gòu)，將控制功能從根本上轉(zhuǎn)移到現(xiàn)場(chǎng)?，F(xiàn)場(chǎng)總線儀表系統(tǒng)不同于以往的儀器儀表系統(tǒng),它的組成和功能更為復(fù)雜,在系統(tǒng)結(jié)構(gòu)、數(shù)據(jù)處理方式和系統(tǒng)的控制方式等方面都有了根本性的改變。

（一）現(xiàn)場(chǎng)總線儀表概述

場(chǎng)總線儀表是指至少內(nèi)置有一個(gè)專用的嵌入式微處理器,并且具有數(shù)字計(jì)算、數(shù)字通信等功能的設(shè)備。它由系統(tǒng)硬件和系統(tǒng)軟件組成,它在系統(tǒng)編程技術(shù)、現(xiàn)場(chǎng)總線接入和嵌人式操作系統(tǒng)等方面將儀表應(yīng)用的功能進(jìn)一步擴(kuò)大,使儀表不僅具有自動(dòng)化測(cè)量、數(shù)據(jù)處理和模擬人工智能的功能,而且還具備了遠(yuǎn)程測(cè)量、遠(yuǎn)程下載軟件升級(jí)、組態(tài)和硬件重構(gòu)等功能。

（二）現(xiàn)場(chǎng)總線儀表的硬件結(jié)構(gòu)

現(xiàn)場(chǎng)總線儀表的硬件結(jié)構(gòu)是完成現(xiàn)場(chǎng)總線儀表任務(wù)主要支撐體系?，F(xiàn)場(chǎng)總線儀表的硬件系統(tǒng)包括傳感器、信號(hào)處理、現(xiàn)場(chǎng)總線通信、控制、存儲(chǔ)器、液晶顯示器、控制輸出接口和電源等幾大模塊?，F(xiàn)場(chǎng)總線儀表的一般硬件結(jié)構(gòu)圖如下圖所示。

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