描述

2711-K3A10L1

輸人輸出是PLC與外部設備進行信息交流的通道，其是否正常工作，除了和輸入輸出單元有關外，還與聯(lián)接配線、接線端子、保險絲等元件狀態(tài)有關。

　　出現(xiàn)輸入故障時，首先檢查LED電源指示器是否響應現(xiàn)場元件（如按鈕、行程開關等）。如果輸入器件被激勵（即現(xiàn)場元件已動作），而指示器不亮，則下一步就應檢查輸入端子的端電壓是否達到正確的電壓值。若電壓值正確，則可替換輸入模塊。若一個LED邏輯指示器變暗，而且根據(jù)編程器件監(jiān)視器、處理器未識別輸入，則輸入模塊可能存在故障。如果替換的模塊并未解決問題且連接正確，則可能是I／O機架或通信電纜出了問題。

　　出現(xiàn)輸出故障時，首先應察看輸出設備是否響應LED狀態(tài)指示器。若輸出觸點通電，模塊指示器變亮，輸出設備不響應。那么，首先應檢查保險絲或替換模塊。若保險絲完好，替換的模塊未能解決問題，則應檢查現(xiàn)場接線。若根據(jù)編程設備監(jiān)視器顯示一個輸出器被命令接通，但指示器關閉，則應替換模塊。

　　在診斷輸入／輸出故障時，最佳方法是區(qū)分究竟是模塊自身的問題，還是現(xiàn)場連接上的問題。如果有電源指示器和邏輯指示器，模塊故障易于發(fā)現(xiàn)。通常，先是更換模塊，或測量輸入或輸出端子板兩端電壓測量值正確，模塊不響應，則應更換模塊。若更換后仍無效，則可能是現(xiàn)場連接出問題了。輸出設備截止，輸出端間電壓達到某一預定值，就表明現(xiàn)場連線有誤。若輸出器受激勵，且LED指示器不亮，則應替換模塊。如果不能從I／O模塊中查出問題，則應檢查模塊接插件是否接觸不良或未對準。最后，檢查接插件端子有無斷線，模塊端子上有無虛焊點。

　　指示診斷

　　LED狀態(tài)指示器能提供許多關于現(xiàn)場設備、連接和I／O模塊的信息。大部分輸入／輸出模塊至少有一個指示器。輸入模塊常設電源指示器，輸出模塊則常設一個邏輯指示器。

　　對于輸入模塊，電源LED顯示表明輸入設備處于受激勵狀態(tài)，模塊中有一信號存在。該指示器單獨使用不能表明模塊的故障。邏輯LED顯示表明輸入信號已被輸入電路的邏輯部分識別。如果邏輯和電源指示器不能同時顯示，則表明模塊不能正確地將輸入信號傳遞給處理器。輸出模塊的邏輯指示器顯示時，表明模塊的邏輯電路已識別出從處理器來的命令并接通。除了邏輯指示器外，一些輸出模塊還有一只保險絲熔斷指示器或電源指示器，或二者兼有。保險絲熔斷指示器只表明輸出電路中的保護性保險絲的狀態(tài)；輸出電源指示器顯示時，表明電源已加在負載上。像輸入模塊的電源指示器和邏輯指示器一樣，如果不能同時顯示，表明輸出模塊就有故障了。

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主營DCS系統(tǒng)配件
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2711-K3A10L1

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