1747-L5141747-L514

實(shí)現(xiàn)控制要點(diǎn) 
輸入輸出信息變換、可靠物理實(shí)現(xiàn)，可以說(shuō)是PLC實(shí)現(xiàn)控制的兩個(gè)基本要點(diǎn)。 
輸入輸出信息變換靠運(yùn)行存儲(chǔ)于PLC內(nèi)存中的程序?qū)崿F(xiàn)。PLC程序既有生產(chǎn)廠家的系統(tǒng)程序(不可更改)，又有用戶(hù)自行開(kāi)發(fā)的應(yīng)用（用戶(hù)）程序。系統(tǒng)程序提供運(yùn)行平臺(tái)，同時(shí)，還為PLC程序可靠運(yùn)行及信號(hào)與信息轉(zhuǎn)換進(jìn)行必要的公共處理。用戶(hù)程序由用戶(hù)按控制要求設(shè)計(jì)。什么樣的控制要求，就應(yīng)有什么樣的用戶(hù)程序。 
可靠物理實(shí)現(xiàn)主要靠輸人（INPUT）及輸出（OUTPUT）電路。PLC的I/O電路，都是專(zhuān)門(mén)設(shè)計(jì)的。輸入電路要對(duì)輸入信號(hào)進(jìn)行濾波，以去掉高頻干擾。而且與內(nèi)部計(jì)算機(jī)電路在電上是隔離的，靠光耦元件建立。輸出電路內(nèi)外也是電隔離的，靠光耦元件或輸出繼電器建立。輸出電路還要進(jìn)行功率放大，以足以帶動(dòng)一般的工業(yè)控制元器件，如電磁閥、接觸器等等。 
I/O電路是很多的，每一輸入點(diǎn)或輸出點(diǎn)都要有一個(gè)I或O電路。PLC有多I/O用點(diǎn)，一般也就有多少個(gè)I/O用電路。但由于它們都是由高度集成化的電路組成的，所以，所占體積并不大。 

鄭娟萍

廈門(mén)仲鑫航自動(dòng)化設(shè)備有限公司 

輸入電路時(shí)刻監(jiān)視著輸入狀況，并將其暫存于輸入暫存器中。每一輸入點(diǎn)都有一個(gè)對(duì)應(yīng)的存儲(chǔ)其信息的暫存器。 
輸出電路要把輸出鎖存器的信息傳送給輸出點(diǎn)。輸出鎖存器與輸出點(diǎn)也是一一對(duì)應(yīng)的 
這里的輸入暫存器及輸出鎖存器實(shí)際就是PLC處理器I/O口的寄存器。它們與計(jì)算機(jī)內(nèi)存交換信息通過(guò)計(jì)算機(jī)總線，并主要由運(yùn)行系統(tǒng)程序?qū)崿F(xiàn)。把輸人暫存器的信息讀到PLC的內(nèi)存中，稱(chēng)輸入刷新。PLC內(nèi)存有專(zhuān)門(mén)開(kāi)辟的存放輸入信息的映射區(qū)。這個(gè)區(qū)的每一對(duì)應(yīng)位（bit）稱(chēng)之為輸入繼電器，或稱(chēng)軟接點(diǎn)。這些位置成1，表示接點(diǎn)通，置成0為接點(diǎn)斷。由于它的狀態(tài)是由輸入刷新得到的，所以，它反映的就是輸入狀態(tài)。

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