描述
在掃描周期計(jì)算處理階段，若設(shè)定掃描周期為固定值（可由用戶通過DM6619設(shè)定），則進(jìn)入等待循環(huán)，直到該指定值到達(dá)，再往下進(jìn)行；若設(shè)定掃描周期為不定值（即決定于用戶程序的長短等），則進(jìn)行掃描周期的計(jì)算。
在I/O刷新階段，進(jìn)行I/O刷新。CPU從輸入電路中讀取各輸入點(diǎn)狀態(tài)，并將此狀態(tài)寫入輸入映像寄存器中；同時將元件映像寄存器的狀態(tài)(1/0)傳送到輸出鎖存電路，再經(jīng)輸出電路隔離和功率放大，驅(qū)動外部負(fù)載。
在外設(shè)端口服務(wù)階段，完成與外設(shè)端口連接的外圍設(shè)備或通信適配器的通信處理。循環(huán)掃描的工作方式，既簡單直觀，又便于用戶程序的設(shè)計(jì)，且為PLC的可靠運(yùn)行提供了可靠地保障。這種工作方式，使PLC一旦掃描到用戶程序某一指令，經(jīng)處理后，其處理結(jié)果就可立即被用戶程序中后續(xù)掃描到的指令所應(yīng)用，而且PLC可通過CPU內(nèi)部設(shè)置的監(jiān)視定時器，監(jiān)視每次掃描是否超過規(guī)定時間，以便有效地避免因CPU內(nèi)部故障而導(dǎo)致程序進(jìn)入死循環(huán)的情況。
歐美品牌停產(chǎn)的，常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域：
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列
本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。
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