1756-DH485[ABGE{IC697VAL318

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 PLC在數(shù)控機(jī)床中的工作流程，和通常的PLC工作流程基本上是一致的，分為以下幾個(gè)步驟:

    (1).輸入采樣:輸入采樣，就是PLC以順序掃描的方式讀入所有輸入端口的信號(hào)狀態(tài)，并將此狀態(tài)，讀入到輸入映象寄存器中。當(dāng)然，在程序運(yùn)行周期中這些信號(hào)狀態(tài)是不會(huì)變化的，除非一個(gè)新的掃描周期的到來(lái)，并且原來(lái)端口信號(hào)狀態(tài)已經(jīng)改變，讀到輸入映象寄存器的信號(hào)狀態(tài)才會(huì)發(fā)生變化。

   (2)、程序執(zhí)行:程序執(zhí)行階段系統(tǒng)會(huì)對(duì)程序進(jìn)行特定順序的掃描，并且同時(shí)讀入輸入映像寄存區(qū)、輸出映像寄存區(qū)的讀取相關(guān)數(shù)據(jù)，在進(jìn)行相關(guān)運(yùn)算后，將運(yùn)算結(jié)果存入輸出映像寄存區(qū)供輸出和下次運(yùn)行使用。

    (3)、出刷新階段:在所指令執(zhí)行完成后，輸出映像寄存區(qū)的所有輸出繼電器的狀態(tài)(接通/斷開(kāi))在輸出刷新階段轉(zhuǎn)存到輸出鎖存器中，通過(guò)特定方式輸出，驅(qū)動(dòng)外部負(fù)載。

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