3HAC026101-001
3HAC026101-001
3HAC026101-001
3HAC026101-001
基于OPC過程控制系統(tǒng)結(jié)構(gòu)采用客戶/服務(wù)器模式，通常把符合OPC規(guī)范的設(shè)備驅(qū)動(dòng)程序稱為OPC服務(wù)器，而將符合OPC規(guī)范的應(yīng)用軟件統(tǒng)稱為OPC客戶。服務(wù)器充當(dāng)客戶與硬件設(shè)備之間的橋梁，客戶對硬件設(shè)備的數(shù)據(jù)讀寫操作由服務(wù)器代理完成，客戶不需要同硬件設(shè)備直接打交道，或者說客戶是獨(dú)立于設(shè)備的（即不管現(xiàn)場設(shè)備以何種形式存在，客戶都以統(tǒng)一的方式去訪問）。在客戶端和服務(wù)器端各自定義了統(tǒng)一的標(biāo)準(zhǔn)“接口”，接口具有不變特性，OPC所提供的接口標(biāo)準(zhǔn)事實(shí)上是一種“軟件接口標(biāo)準(zhǔn)”或“軟件總線”，它明確定義了客戶同服務(wù)器之間的通信機(jī)制，是連接客戶同服務(wù)器的橋梁和紐帶。這樣，我們可以自由選擇最符合我們實(shí)際要求的軟、硬件產(chǎn)品，然后將它們像“搭積木”一樣組合在一起進(jìn)行無縫地工作，這一切都來源于OPC所提供的強(qiáng)大互操作性的特點(diǎn)，對此我們可以作一個(gè)形象的比喻：盡管家用電器的種類繁多，但它們的電源插頭與插座卻是統(tǒng)一的？梢赃@樣說，統(tǒng)一的標(biāo)準(zhǔn)接口是OPC的實(shí)質(zhì)和靈魂。
類似于工業(yè)組態(tài)軟件中的相關(guān)概念，OPC規(guī)范主要定義了數(shù)據(jù)訪問規(guī)范、報(bào)警和事件處理規(guī)范及歷史數(shù)據(jù)訪問規(guī)范三部分，對應(yīng)于每種規(guī)范可以實(shí)現(xiàn)相應(yīng)的OPC服務(wù)器。OPC數(shù)據(jù)訪問服務(wù)器在結(jié)構(gòu)上由服務(wù)器（Server）、組（Group）和項(xiàng)（Item）三級(jí)對象組成。在邏輯關(guān)系上，上一級(jí)對象是下一級(jí)對象的父對象，下一級(jí)對象則是上一級(jí)對象的子對象，OPC數(shù)據(jù)訪問服務(wù)器正是通過這種“集合”的概念來組織和管理其內(nèi)部結(jié)構(gòu)的。項(xiàng)對象作為結(jié)構(gòu)層次中最基本的單元直接對應(yīng)著物理硬件設(shè)備的某個(gè)具體數(shù)據(jù)單元，項(xiàng)對象作為物理數(shù)據(jù)的存儲(chǔ)載體，主要包含數(shù)據(jù)值（當(dāng)前設(shè)備單元中的數(shù)據(jù)）、時(shí)間標(biāo)簽（當(dāng)前采集到的數(shù)據(jù)時(shí)間定位）和品質(zhì)信息（當(dāng)前采集到的數(shù)據(jù)可靠程度）等信息。
客戶對硬件設(shè)備的數(shù)據(jù)讀寫操作分為同步和異步兩種方式。同步方式適合于發(fā)送、接收數(shù)據(jù)量較少的場合；相比同步方式，異步方式占用較少的資源，效率更高，適合大數(shù)據(jù)量的場合，在實(shí)際中的應(yīng)用也更為廣泛。在沒有開發(fā)出OPC標(biāo)準(zhǔn)之前，異步方式的存取是不可能的，會(huì)導(dǎo)致存取沖突的發(fā)生。
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