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介紹了推進(jìn)系統(tǒng)的基本組成,重點(diǎn)介紹了基于多線程技術(shù)的PLC與PC的通訊方式,給出了部分VC6.0的程序,該種通訊方法簡單、實(shí)用有較高的實(shí)用價(jià)值。
關(guān)鍵詞:串行通訊PLC多線程重疊結(jié)構(gòu)VC6.0
0.引言
在現(xiàn)代工業(yè)控制系統(tǒng)中,PLC以其高可靠性、適應(yīng)工業(yè)過程現(xiàn)場、強(qiáng)大的聯(lián)網(wǎng)功能等特點(diǎn),被廣泛應(yīng)用。可實(shí)現(xiàn)順序控制、PID回路調(diào)節(jié)、高速數(shù)據(jù)采集分析、計(jì)算機(jī)上位管理,是實(shí)現(xiàn)機(jī)電一體化的重要手段和發(fā)展方向。但PLC無法單獨(dú)構(gòu)成完整的控制系統(tǒng),無法進(jìn)行復(fù)雜的運(yùn)算和顯示各種實(shí)時(shí)控制圖表和曲線,無良好的用戶界面,不便于監(jiān)控。將個(gè)人計(jì)算機(jī)(PC)與PLC結(jié)合起來使用,可以使二者優(yōu)勢互補(bǔ),充分利用個(gè)人計(jì)算機(jī)強(qiáng)大的人機(jī)接口功能、豐富的應(yīng)用軟件和低廉的價(jià)格優(yōu)勢,組成高性能價(jià)格比的控制系統(tǒng)。
1.系統(tǒng)構(gòu)成
推進(jìn)系統(tǒng)中,PC機(jī)選用工控計(jì)算機(jī)。它是整個(gè)控制系統(tǒng)的核心,是上位機(jī)。其主要利用良好的圖形用戶界面,顯示從PLC接收的開關(guān)量和控制手柄的位置,進(jìn)行一些較復(fù)雜的數(shù)據(jù)運(yùn)算,并且向PLC發(fā)出控制指令。
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