廈門莫格電氣自動化有限公司

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（二）開關(guān)量I/O

    開關(guān)量I/O接口可從傳感器和開關(guān)（如按鈕、限位開關(guān)等）及控制設(shè)備（如指示燈、報警器、電動機起動器等）接收信號。典型的交流輸入/輸出信號為24～240V，直流輸入/輸出信號為5～240V。盡管輸入電路因制造廠家不同而不同，但有些特性是相同的，如用于消除錯誤信號的抖動電路等。此外，大多數(shù)輸入電路在高壓電源輸入和接口電路的控制邏輯部分之間都設(shè)有可選的隔離電路。在評估離散輸出時，應(yīng)考慮熔絲、瞬時浪涌保護和電源與邏輯電路間的隔離電路。熔絲電路也許在開始時花費較多，但可能比在外部安裝熔絲耗資要少。

    （三）模擬量I/O

    模擬量輸入/輸出接口一般用來感知傳感器產(chǎn)生的信號。這些接口可用于測量流量、溫度和壓力，并可用于控制電壓或電流輸出設(shè)備。這些接口的典型量程為-10～+10V、0～+11V、4～20mA或10～50mA。一些制造廠家在PLC上設(shè)計有特殊模擬接口，因而可接收低電平信號，如RTD、熱電偶等。一般來說，這類接口模塊可用于接收同一模塊上不同類型的熱電偶或RTD混合信號。

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HAND TAP L6" D2 9/16" HS 6 THREAD
 
MECMAN PRESSURE REGULATOR 370-12 0400-1
 
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1-1/4"X1" HSS USA MILL L:6.801 99924
 
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