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由于PLC的高性能和高可靠性,目前已廣泛應(yīng)用于工業(yè)控制領(lǐng)域,并從單純的邏輯控制發(fā)展為集邏輯控制、過(guò)程控制、伺服控制、數(shù)據(jù)處理和網(wǎng)絡(luò)通信功能于一體的多功能控制器。由于PLC本身并不配置顯示功能,因而實(shí)現(xiàn)其內(nèi)部數(shù)據(jù)顯示就變得很重要了,而且成為PLC控制系統(tǒng)設(shè)計(jì)的一個(gè)難點(diǎn)。
在PLC控制系統(tǒng)中,需要顯示的內(nèi)容主要有計(jì)時(shí)器值、計(jì)數(shù)器值和數(shù)據(jù)寄存器值,數(shù)據(jù)顯示方法可歸納為兩種基本類型:一類為基于PLC數(shù)據(jù)通信接口,如RS-232,RS-485/422,顯示裝置也具有此類接口,通過(guò)數(shù)據(jù)通信方式實(shí)現(xiàn)數(shù)據(jù)顯示。
基于通信的數(shù)據(jù)顯示技術(shù)
利用數(shù)據(jù)通信接口進(jìn)行數(shù)據(jù)傳送和顯示,是實(shí)現(xiàn)PLC數(shù)據(jù)顯示的有效途徑。目前主流PLC均提供標(biāo)準(zhǔn)的RS-232或RS一485/422接口,或者通過(guò)模塊擴(kuò)展增加此類接口。
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ABB Procontic CS31 ICDG32L1 GJR5251400R0101 ICDG32L1B
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Stber Kommubox 40 021 CAN 1,4A MOUSE-TRAK B-SAIMP-XROHSPLCMOUSE-TRAK B-SAIMP-XROHSPLCMOUSE-TRAK B-SAIMP-XROHSPLC