| HK50AA031 |
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價(jià)格: 元(人民幣) | 產(chǎn)地:本地 |
| 最少起訂量:1個(gè) | 發(fā)貨地:福州 | |
| 上架時(shí)間:2017-11-03 10:46:44 | 瀏覽量:275 | |
福州卓凱電子科技有限公司
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| 經(jīng)營(yíng)模式:貿(mào)易公司 | 公司類型:私營(yíng)獨(dú)資企業(yè) | |
| 所屬行業(yè):電感元器件 | 主要客戶:企業(yè) | |
在線咨詢 ![]() |
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| 聯(lián)系人:林工 (小姐) | 手機(jī):17705012279 |
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電話: |
傳真: |
| 郵箱:879520885@qq.com | 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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HK50AA031
HK50AA031
HK50AA031
PLC是采用“順序掃描,不斷循環(huán)”的方式進(jìn)行工作的。即在PLC運(yùn)行時(shí),CPU根據(jù)用戶按控制要求編制好并存于用戶存儲(chǔ)器中的程序,按指令步序號(hào)(或地址號(hào))作周期性循環(huán)掃描,如無(wú)跳轉(zhuǎn)指令,則從第一條指令開始逐條順序執(zhí)行用戶程序,直至程序結(jié)束。然后重新返回第一條指令,開始下一輪新的掃描。在每次掃描過(guò)程中,還要完成對(duì)輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新等工作。
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
電話:0591-22983857
聯(lián)系QQ:879520885
傳真:0591-22989937
產(chǎn)品價(jià)格以電話或者QQ詢價(jià)為準(zhǔn),發(fā)布價(jià)格不做參考
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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**
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