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產(chǎn)品型號:DSDI110AV1
產(chǎn)品品牌:ABB
對于開關(guān)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(yīng)根據(jù)負(fù)載要求來決定,選擇不當(dāng)會使系統(tǒng)可靠性降低,嚴(yán)重時導(dǎo)致系統(tǒng)不能正常工作。如晶閘管輸出只能用于交流負(fù)載,晶體管輸出只能用于直流負(fù)載。此外,PLC的輸出端子帶負(fù)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(dāng)檢測到異常信號時,系統(tǒng)按程序自動轉(zhuǎn)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(yīng)采取相應(yīng)的保護措施,以保護PLC的輸出觸點。
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