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IC697CHS782

IC697CHS782

IC697CHS782

IC697CHS782

OPC（OLE for Process Control）是Microsoft公司的對象鏈接和嵌入OLE/COM技術(shù)在過程控制方面的應(yīng)用，為工業(yè)控制領(lǐng)域提供了標(biāo)準(zhǔn)的數(shù)據(jù)訪問機(jī)制。OPC采用客戶/服務(wù)器結(jié)構(gòu)，提供了兩套接口方案，分別為COM接口和OLE自動化接口。COM接口效率高，通過它客戶能夠發(fā)揮OPC服務(wù)器的最佳性能，采用C++語言的客戶一般采用此方案；OLE自動化接口使解釋性語言和宏語言訪問OPC服務(wù)器成為可能，采用VB語言的客戶一般采用此方案。

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OPC作為硬件和軟件之間的一個中間件，解決了上述問題，它為工業(yè)數(shù)據(jù)通訊提供了一種標(biāo)準(zhǔn)。OPC技術(shù)擴(kuò)展了硬件設(shè)備的概念，只要符合OPC服務(wù)器的規(guī)范，OPC客戶都可以與之進(jìn)行數(shù)據(jù)交換。硬件廠商只需要編寫一套驅(qū)動程序就可以滿足不同用戶的需要，軟件開發(fā)商也無需了解硬件設(shè)備究竟是哪家廠商的及其硬件實(shí)質(zhì)，因此OPC在短時間內(nèi)取得了飛速的發(fā)展。只要遵循OPC規(guī)范，管理網(wǎng)即可隨時通過OPC接口來獲取工藝生產(chǎn)過程數(shù)據(jù)了。
DDE（Dynamic Data Exchange 動態(tài)數(shù)據(jù)交換）允許應(yīng)用程序之間共享數(shù)據(jù)，它在功能上類似OLE，但不嵌入，即客戶程序（Client）和服務(wù)程序（Server）是單獨(dú)運(yùn)行的。它們之間的會話經(jīng)由一條通道（Channel）來進(jìn)行，整個會話過程由程序控制，不需用戶進(jìn)行任何干涉。 

盡管DDE正逐漸被OLE取代，但其作為一種應(yīng)用程序之間共享數(shù)據(jù)的手段，仍然受到廣泛的使用和支持。相比之下，OLE服務(wù)器通過嵌入到客戶程序中來為其提供服務(wù)，激活速度常常慢得讓人討厭。因此，在某些情況下OLE是無法取代DDE的。
管理OPC標(biāo)準(zhǔn)的組織是OPC基金會，全世界幾乎全部的控制系統(tǒng)、儀器儀表和過程控制系統(tǒng)的主要供應(yīng)商都是該組織成員。世界各大公司的工業(yè)組態(tài)監(jiān)控軟件均支持DDE、OPC，所以本Excel工業(yè)報(bào)表系統(tǒng)適用于全球各大公司的工業(yè)組態(tài)監(jiān)控系統(tǒng)。

本文這里我們介紹工業(yè)組態(tài)軟件為“天工組態(tài)”，采用DDE的鏈接方式。使用DDE的一種典型方式是在兩個程序間建立鏈接（會話）。一旦建立了鏈接，兩個程序就可以連續(xù)而自動地把數(shù)據(jù)來回地傳來傳去。當(dāng)一方的數(shù)據(jù)發(fā)生改變時，另一方的數(shù)據(jù)也自動改變。DDE通常用于交換簡短明確的文本字符串，如電子表格的單元格，或一個數(shù)據(jù)庫的字段等。DDE會話由DDE客戶程序和DDE服務(wù)器程序組成。通常請求數(shù)據(jù)的應(yīng)用程序是客戶；提供被請求的數(shù)據(jù)。更新DDE客戶端數(shù)據(jù)的是服務(wù)器。

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