MVI69L-MBTCP
MVI69L-MBTCP
廈門莫格電氣自動化有限公司
:祖
:
(同號)
:1811245942
:1811245942
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PLC的輸入、輸出設(shè)備
輸入電路是PLC接受開關(guān)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(guān)量輸入為例,按鈕、行程開關(guān)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(guān)是容易產(chǎn)生故障的元件,設(shè)計時,應(yīng)盡量選用可靠性高的接近開關(guān)代替機械限位開關(guān)。此外,按鈕觸點的選擇也影響到系統(tǒng)的可靠性。在設(shè)計電路時,應(yīng)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(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zui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(jìn)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(hù)措施,以保護(hù)PLC的輸出觸點。
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