| 產(chǎn)品參數(shù) |
| 品牌 | AB |
| 產(chǎn)品特性 | 進(jìn)口*** |
| 是否進(jìn)口 | 否 |
| 加工定制 | 否 |
| 工作電壓 | 24VDCV |
| 輸出頻率 | 50kHz |
| 產(chǎn)品認(rèn)證 | UL |
| 系列 | 1746 1756 |
| 物料編碼 | 1788-EN2DN |
| 運(yùn)輸 | 快遞物流 |
| 時(shí)效 | 3天- |
| 快遞費(fèi)用 | 包郵順豐 |
| 訂貨號(hào) | 1788-EN2DN |
| 包裝方式 | 普通包裝 |
| 可售賣(mài)地 | 全國(guó) |
| 型號(hào) | 1788-EN2DN | |
1788-EN2DN輸入模塊
1788-EN2DN輸入模塊
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PLC是按什么樣的工作方式進(jìn)行工作的？它的中心工作過(guò)程分哪幾個(gè)階段？在每個(gè)階段主要完成哪些控制任務(wù)？
下面來(lái)回答這個(gè)問(wèn)題：
PLC是按集中輸入、集中輸出，周期性循環(huán)掃描的方式進(jìn)行工作的。它的中心工作過(guò)程分輸入采樣階段、程序執(zhí)行階段、輸出刷新階段。
在輸入采樣階段，首先掃描所以輸入端子，并將各輸入狀態(tài)存入相對(duì)應(yīng)的輸入映像寄存器中，此時(shí)輸入映像寄存器被刷新，它與外界隔離，其內(nèi)容保持不變，直到下一個(gè)掃描周期的輸入采樣階段。
在程序執(zhí)行階段，PLC按從左到右、從上到下的步驟順序執(zhí)行程序。
在輸出刷新階段中，元件映像寄存器中所有輸出繼電器的狀態(tài)一起轉(zhuǎn)存到輸出鎖存器中，通過(guò)一定方式集中輸出， 后經(jīng)過(guò)輸出端子驅(qū)動(dòng)外部負(fù)責(zé)，在下一個(gè)輸出刷新階段開(kāi)始之前，輸出鎖存器的狀態(tài)不會(huì)改變。
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