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價格：
元(人民幣) |
產地：Allen Bradley 1747-sdn/D |
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最少起訂量：1個 |
發貨地：Allen Bradley 1747-sdn/D |
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上架時間：2021-07-12 16:50:43 |
瀏覽量：118 |
廈門光沃自動化設備有限公司
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經營模式：經銷商 |
公司類型：其他有限責任公司 |
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所屬行業：PLC控制系統 |
主要客戶：全國市場 |
 在線咨詢  |
聯系方式
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聯系人:吳
(先生) |
手機:18030229050 |
電話: |
傳真: |
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郵箱:1878187406@qq.com |
地址:廈門市海滄區滄湖東一里海景奧斯卡 |
詳細介紹
Allen Bradley 1747-sdn/D 如果我們采用內部上拉的方式做輸入檢測的話，如下圖，讓這個設備輸出低電平，然后連接單片機的IO口。這時，5V經過IO口內部10kΩ上拉電阻到達IO口，再到裝置內部的100kΩ電阻，通過開關接到GND。根據分壓原理，IO口上讀到的電壓值大概是4.55V，于是單片機讀取的是高電平。而事實上，設備是想輸出低電平告知單片機。這里單片機管腳作為輸入功能，卻干擾了外界裝置的輸出值，相當于單片機的這個IO口也在輸出。
如果我們將IO口的輸入狀態設置為高阻狀態，且沒有外接上下拉電阻，內部的兩個上下MOS管都是斷開的，對外部呈現高阻態。從下圖中可以看出，裝置輸出的電平能被準確的讀取到單片機中。之所以能準確讀取，就是因為設備輸出電阻比單片機IO口的輸入電阻要小。有人可能會說，如果把設備中的電阻換成1000MΩ，這個時候這個單片機又不能準確讀取電平了。但是一般情況下，我們不需要考慮這么極端。如果是理想的高阻態，其輸入阻抗應該是無窮大，而這有點像超導體一樣比較特殊。一般情況下認為導線電阻幾乎為0，所以同樣也認為高阻態輸入電阻是無窮大。
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