描述

1C31234G01

現(xiàn)場總線技術(shù)是在80年代后期發(fā)展起來的一種先進的現(xiàn)場工業(yè)控制技術(shù)，它綜合了數(shù)字通信技術(shù)、計算機技術(shù)、自動控制技術(shù)、網(wǎng)絡技術(shù)和智能儀表等多種技術(shù)手段，從根本上突破了傳統(tǒng)的“點對點”式的模擬信號或數(shù)字一模擬信號控制的局限性，構(gòu)成一種全分散、全數(shù)字化、智能、雙向、互連、多變量、多接點的通信與控制系統(tǒng)?，F(xiàn)場總線則是連接智能現(xiàn)場設備和自動化系統(tǒng)的數(shù)字式、雙向傳輸、多分支結(jié)構(gòu)的通信網(wǎng)絡，其基礎(chǔ)是智能儀表。分散在各個工業(yè)現(xiàn)場的智能儀表通過數(shù)字現(xiàn)場總線連為一體，并與控制室中的控制器和監(jiān)視器一起共同構(gòu)成現(xiàn)場總線控制系統(tǒng)（Fieldbus Control System，F(xiàn)CS）。通過遵循一定的國際標準，可以將不同廠商的現(xiàn)場總線產(chǎn)品集成在同一套FCS中，具有互換性和互操作性。FCS把傳統(tǒng)DCS的控制功能進一步下放到現(xiàn)場智能儀表，由現(xiàn)場智能儀表完成數(shù)據(jù)采集、數(shù)據(jù)處理、控制運算和數(shù)據(jù)輸出等功能?，F(xiàn)場儀表的數(shù)據(jù)（包括采集的數(shù)據(jù)和診斷數(shù)據(jù)）通過現(xiàn)場總線傳到控制室的控制設備上，控制室的控制設備用來監(jiān)視各個現(xiàn)場儀表的運行狀態(tài)，保存各智能儀表上傳的數(shù)據(jù)，同時完成少量現(xiàn)場儀表無法完成的高級控制功能。另外，F(xiàn)CS還可通過網(wǎng)關(guān)和企業(yè)的上級管理網(wǎng)絡相連，以便企業(yè)管理者掌握第一手資料，為決策提供依據(jù)。所以現(xiàn)場總線具有以下突出特點

系統(tǒng)結(jié)構(gòu)的高度分散性現(xiàn)場設備本身屬于智能化設備，具有獨立自動控制的基本功能，從而從根本上改變了DCS的集中與分散相結(jié)合的體系結(jié)構(gòu)，形成了一種全新的分布式控制系統(tǒng)，實現(xiàn)了控制功能的徹底分散，提高了控制系統(tǒng)的可靠性，簡化了控制系統(tǒng)的結(jié)構(gòu)?，F(xiàn)場總線與上一級網(wǎng)絡斷開后仍可維持底層設備的獨立正常運行，其智能程度大大加強?，F(xiàn)場設備的高度智能化
傳統(tǒng)的DCS使用相對集中的控制站，其控制站由CPU單元和輸入/輸出單元等組成。現(xiàn)場總線控制系統(tǒng)則將DCS的控制站功能徹底分散到現(xiàn)場控制設備，僅靠現(xiàn)場總線設備就可以實現(xiàn)自動控制的基本功能，如數(shù)據(jù)采集與補償、PID運算和控制、設備自校驗和自診斷等功能。系統(tǒng)的操作員可以在控制室實現(xiàn)遠程監(jiān)控，設定或調(diào)整現(xiàn)場設備的運行參數(shù)，還能借助現(xiàn)場設備的自診斷功能對故障進行定位和診斷。

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ORTHODYNE ELECTRONICS PCB ASSY 171562 CIRCUIT BOARD

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Orthodyne electronics 171507 Rev. M 171507/M

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