渦流傳感器及前置器PR6423/10R-030+CON021序執(zhí)行階段。在執(zhí)行用戶程序過(guò)程中，PLC按照梯形圖程序掃描原則，一般來(lái)說(shuō)，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(lái)決定程序跳轉(zhuǎn)地址。程序執(zhí)行過(guò)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)

渦流傳感器及前置器PR6423/10R-030+CON021

渦流傳感器及前置器PR6423/10R-030+CON021

控制過(guò)程可以分為若干個(gè)階段，這些階段稱為狀態(tài)或者步。狀態(tài)與狀態(tài)之間由轉(zhuǎn)換條件分隔。當(dāng)相鄰兩狀態(tài)之間的轉(zhuǎn)換條件得到滿足時(shí)，就實(shí)現(xiàn)狀態(tài)轉(zhuǎn)換。狀態(tài)轉(zhuǎn)移只有一種流向的稱作單流程順控結(jié)構(gòu)。

   每一個(gè)狀態(tài)或者步用一個(gè)狀態(tài)元件表示，S0為初始步，也稱為準(zhǔn)備步，表示初始準(zhǔn)備是否到位。其它為工作步。

狀態(tài)元件是構(gòu)成狀態(tài)轉(zhuǎn)移圖的基本元素，是可編程控制器的軟元件之一。 FX2N 共有 1000個(gè)狀態(tài)元件

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