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詳細(xì)參數(shù)
品牌 羅克韋爾 規(guī)格型號(hào) 3HAC020079-001
編號(hào) 3HAC020079-001 計(jì)量單位 1塊
付款方式 面議 參考價(jià)格 688
價(jià)格單位 人民幣 供貨量 不限
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產(chǎn)地 美國(guó) 發(fā)貨地 福建廈門市

產(chǎn)品詳情

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品牌：ABB       型號(hào)：3HAC020079-001

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PLC執(zhí)行程序的過程分為三個(gè)階段，即輸入采樣階段、程序執(zhí)行階段、輸出刷新階段，PLC的掃描工作過程:

（1）輸入采樣階段。在這一階段中，PLC以掃描方式讀入所有輸入端子上的輸入信號(hào)，并將各輸入狀態(tài)存入對(duì)應(yīng)的輸入映像寄存器中。此時(shí)，輸入映像寄存器被刷斷。在程序執(zhí)行階段和輸出刷新階段中，輸入映像存儲(chǔ)器與外界隔離，其內(nèi)容保持不變，直至下一個(gè)掃描周期的輸入掃描階段，才被重新讀入的輸入信號(hào)刷新?？梢?，PLC在執(zhí)行程序和處理數(shù)據(jù)時(shí)，不直接使用現(xiàn)場(chǎng)當(dāng)時(shí)的輸入信號(hào)，而使用本次采樣時(shí)輸入到映像區(qū)中的數(shù)據(jù)。一般來說，輸入信號(hào)的寬度要大于一個(gè)掃描周期，否則可能造成信號(hào)的丟失。

（2）程序執(zhí)行階段。在執(zhí)行用戶程序過程中，PLC按照梯形圖程序掃描原則，一般來說，PLC按從左至右、從上到下的步驟逐個(gè)執(zhí)行程序。但遇到程序跳轉(zhuǎn)指令，則根據(jù)跳轉(zhuǎn)條件是否滿足來決定程序跳轉(zhuǎn)地址。程序執(zhí)行過程中，當(dāng)指令中涉及輸入、輸出狀態(tài)時(shí)，PLC就從輸入映像寄存器中“讀入”對(duì)應(yīng)輸入端子狀態(tài)，從輸出映像寄存器“讀入”對(duì)應(yīng)元件（“軟繼電器”）的當(dāng)前狀態(tài)。然后進(jìn)行相應(yīng)的運(yùn)算，運(yùn)算結(jié)果再存入輸出映像寄存器中。對(duì)輸出映像寄存器來說，每一個(gè)元件（“軟繼電器”）的狀態(tài)會(huì)隨著程序執(zhí)行過程而變化。

（3）輸出刷新階段。程序執(zhí)行階段的運(yùn)算結(jié)果被存入輸出映像區(qū)，而不送到輸出端口上。在輸出刷新階段，PLC將輸出映像區(qū)中的輸出變量送入輸出鎖存器，然后由鎖存器通過輸出模塊產(chǎn)生本周期的控制輸出。如果內(nèi)部輸出繼電器的狀態(tài)為“1”，則輸出繼電器觸點(diǎn)閉合，經(jīng)過輸出端子驅(qū)動(dòng)外部負(fù)載。全部輸出設(shè)備的狀態(tài)要保持一個(gè)掃描周期。


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