MKS 901P-11030

MKS 901P-11030

：祖巧麗

：

PLC的輸入模塊是用來檢測接收現(xiàn)場輸入設(shè)備的信號，并將輸入的信號轉(zhuǎn)換為PLC內(nèi)部接受的低電壓信號。

1．輸入信號的類型及電壓等級的選擇 常用的開關(guān)量輸入模塊的信號類型有三種：直流輸入、交流輸入和交流／直流輸入。選擇時一般根據(jù)現(xiàn)場輸入信號及周圍環(huán)境來決定。

交流輸入模塊接觸可靠，適合于有油霧、粉塵的惡劣環(huán)境下使用；直流輸入模塊的延遲時間較短，還可以直接與接近開關(guān)、光電開關(guān)等電子輸入設(shè)備連接。

PLC的開關(guān)量輸入模塊按輸入信號的電壓大小分類有：直流5V、24V、48V、60V等；交流110V、220V等。選擇時應(yīng)根據(jù)現(xiàn)場輸入設(shè)備與輸入模塊之間的距離來決定。一般5V、12V、24V用于傳輸距離較近場合。如：5V的輸入模塊zui遠(yuǎn)不得超過10m距離，較遠(yuǎn)的應(yīng)選用電壓等級較高的模塊。

2．輸入接線方式選擇   接輸入電路接線方式的不同，開關(guān)量輸入模塊可分為匯點式輸入和分組式輸入兩種，如圖1所示。

匯點式輸入模塊的輸入點只共用一個COM端；而分組式輸入模塊是將分成若干組，一組共用一個COM，每組之間是分隔的。分組式輸入模塊的每點價格教高，如果輸入信號之間不需要分開，應(yīng)選擇匯點式。

3．同時接通的輸入點的數(shù)量

對于選用高密度的輸入模塊（32點、48點），應(yīng)考慮該模塊同時接通的輸入點的數(shù)量一般不超過點數(shù)的60%。

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