多給我一次報價的機會 您就多一份優(yōu)勢的選擇C400/A8/1/1/1/00
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產(chǎn)品精品 價格百年一遇
廈門岳航計算機工程有限公司
電話;0592-5085329
省錢熱線,;18030132586(陳工)
QQ;1151195663
廈門市思明區(qū)湖濱東路湖光大廈8樓A座
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PLC是采用“順序掃描,,不斷循環(huán)”的方式進行工作的。即在PLC運行時,,CPU根據(jù)用戶按控制要求編制好并存于用戶存儲器中的程序,,按指令步序號(或地址號)作周期性循環(huán)掃描,如無跳轉(zhuǎn)指令,,則從條指令開始逐條順序執(zhí)行用戶程序,,直至程序結(jié)束。然后重新返回條指令,,開始下一輪新的掃描,。在每次掃描過程中,還要完成對輸入信號的采樣和對輸出狀態(tài)的刷新等工作,。
PLC的一個掃描周期必經(jīng)輸入采樣,、程序執(zhí)行和輸出刷新三個階段。
PLC在輸入采樣階段: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,,并將其寫入各對應(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,,進入程序執(zhí)行階段,。
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