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1336-BDB-SP18C

1336-BDB-SP18C

1336-BDB-SP18C

PLC的一個(gè)掃描周期必經(jīng)輸入采樣、程序執(zhí)行和輸出刷新三個(gè)階段。

PLC在輸入采樣階段：首先以掃描方式按順序?qū)⑺袝捍嬖谳斎腈i存器中的輸入端子的通斷狀態(tài)或輸入數(shù)據(jù)讀入，并將其寫(xiě)入各對(duì)應(yīng)的輸入狀態(tài)寄存器中，即刷新輸入。隨即關(guān)閉輸入端口，進(jìn)入程序執(zhí)行階段。

PLC在程序執(zhí)行階段：按用戶程序指令存放的先后順序掃描執(zhí)行每條指令，經(jīng)相應(yīng)的運(yùn)算和處理后，其結(jié)果再寫(xiě)入輸出狀態(tài)寄存器中，輸出狀態(tài)寄存器中所有的內(nèi)容隨著程序的執(zhí)行而改變。

輸出刷新階段：當(dāng)所有指令執(zhí)行完畢，輸出狀態(tài)寄存器的通斷狀態(tài)在輸出刷新階段送至輸出鎖存器中，并通過(guò)一定的方式（繼電器、晶體管或晶閘管）輸出，驅(qū)動(dòng)相應(yīng)輸出設(shè)備工作。

福州卓凱電子科技有限公司聯(lián)系人：林工
24小時(shí)咨詢熱線：17705012279

TEL：0591-22983857

QQ：879520885

傳真：0591-22989937
公司地址：福州市閩侯西江濱大道77號(hào)正榮潤(rùn)園一號(hào)樓1205室
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