140CPS41400C Quantum

140CPS41400C

如何把一個 PT100 溫度傳感器連接到模擬輸入模塊 SM331

PT100 熱電阻隨溫度的不同其電阻值隨之變化。如果有一恒定電流流經該熱電阻，該熱電阻上電壓的下降隨溫度而變化。恒定電流加在接點 Ic+和 Ic-上。模擬

模塊 SM331 在 M+和 M-電測定電流的變化。通過測定電壓就可以確定出溫度。

PT100 到模擬輸入組有三類連接、4 線連接可得到的測定值。

*注意：

1）3 線連接用的公式僅表明了模擬輸入模塊 SM331（MLFB 號為 6ES7331-7Kxxx-0AB0）b"的實際測定過程。

2）在 S7-300 系列中，存在一些通過多次測定的模擬輸入端。它們規定出公共返回線的線電阻并作數學補償。所獲度幾乎與 4 線連接可比美。這樣模塊的

一個例子就是 SM331（MLFB 號 6ES7331-7PF00-0AB0）。

3）所給出的公式仍然適用于主要的物理關系，但并不包含確定 PT100 電阻的有效測定過程。

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