描述

ESTIC-ENRZ-TU013-S

七十年代以前，控制系統(tǒng)中采用模擬量對傳輸及控制信號進行轉換、傳遞，其精度差、受干擾信號影響大，因而整個控制系統(tǒng)的控制效果及系統(tǒng)穩(wěn)定性都很差。七十年代末，隨著大規(guī)模集成電路的出現(xiàn)，微處理器技術得到很大發(fā)展。微處理器功能強、體積小、可靠性高、通過適當?shù)慕涌陔娐酚糜诳刂葡到y(tǒng)，控制效果得到提高；但是盡管如此，還是屬于集中式控制系統(tǒng)。隨著過程控制技術、自動化儀表技術和計算機網(wǎng)絡技術的成熟和發(fā)展，控制領域又發(fā)生了一次技術變革。這次變革使傳統(tǒng)的控制系統(tǒng)（如集散控制系統(tǒng)）無論在結構上還是在性能上都發(fā)生了巨大的飛躍，這次變革的基礎就是現(xiàn)場總線技術的產(chǎn)生。
現(xiàn)場總線是連接現(xiàn)場智能設備和自動化控制設備的雙向串行、數(shù)字式、多節(jié)點通信網(wǎng)絡，它也被稱為現(xiàn)場底層設備控制網(wǎng)絡（INFRANET）。80年代以來，各種現(xiàn)場總線技術開始出現(xiàn)，人們要求對傳統(tǒng)的模擬儀表和控制系統(tǒng)變革的呼聲也越來越高，從而使現(xiàn)場總線成為一次世界性的技術變革浪潮。美國儀表協(xié)會(ISA)于1984年開始制訂現(xiàn)場總線標準，在歐洲有德國的PROFIBUS和法國的FIP等，各種現(xiàn)場總線標準陸續(xù)形成。其中主要的有：基金會現(xiàn)場總線FF（Foundation Fieldbus）、控制局域網(wǎng)絡CAN（Controller Area Network）、局部操作網(wǎng)絡LonWorks（Local Operating Network）、過程現(xiàn)場總線PROFIBUS（Process Field Bus）和HART協(xié)議(Highway Addressable Remote Transducer)等。但是，總線標準的制定工作并非一帆風順，由于行業(yè)與地域發(fā)展等歷史原因，加上各公司和企業(yè)集團受自身利益的驅使，致使現(xiàn)場總線的國際化標準工作進展緩慢。但是不論如何，制定單一的開放國際現(xiàn)場總線標準是發(fā)展的必然。

產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務質量，
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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