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
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