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1784-kt

輸入電路是plc接受開關量、模擬量等輸入信號的端口，其元器件質(zhì)量的優(yōu)劣、接線方式及是否牢靠也是影響控制系統(tǒng)可靠性的重要因素  。以開關量輸入為例，按鈕、行程開關的觸點接觸要保持在良好狀態(tài)，接線要牢固可靠。機械限位開關是容易產(chǎn)生故障的元件，設計時，應盡量選用可靠性高的接近開關代替機械限位開關。此外，按鈕觸點的選擇也影響到系統(tǒng)的可靠性。在設計電路時，應盡量選用可靠性高的元器件，對于模擬量輸入信號來說，常用的有4～20ma、0～20ma直流電流信號；0～5v、0～10v直流電壓信號，電源為直流24v. 

　　對于開關量輸出來說，plc的輸出有繼電器輸出、晶閘管輸出、晶體管輸出三種形式，具體選擇哪種形式的輸出應根據(jù)負載要求來決定，選擇不當會使系統(tǒng)可靠性降低，嚴重時導致系統(tǒng)不能正常工作。如晶閘管輸出只能用于交流負載，晶體管輸出只能用于直流負載。此外，plc的輸出端子帶負載能力是有限的，如果超過了規(guī)定的最大限值，必須外接繼電器或接觸器，才能正常工作。外接繼電器、接觸器、電磁閥等執(zhí)行元件的質(zhì)量，是影響系統(tǒng)可靠性的重要因素  。常見的故障有線圈短路、機械故障造成觸點不動或接觸不良。這一方面可以通過選用高質(zhì)量的元器件來提高可靠性，另一方面，在對系統(tǒng)可靠性及智能化要求較高的場合，可以根據(jù)電路中電流異常的情況對輸出單元的一些重點部位進行診斷，當檢測到異常信號時，系統(tǒng)按程序自動轉入故障處理，從而提高系統(tǒng)工作的可靠性。若plc輸出端子接有感性元件，則應采取相應的保護措施，以保護plc的輸出觸點。 

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