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小魔仙
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樓主  發(fā)表于: 2022-04-02 15:35
新PLC的其中一個(gè)輸出點(diǎn)有顯示，輸出點(diǎn)對電源有電壓，但繼電器不動(dòng)作，繼電器沒(méi)問(wèn)題，請教各位原因
曾姚王
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1樓  發(fā)表于: 2022-04-02 17:17
輸出電源如果是直流，繼電器線(xiàn)圈接線(xiàn)極性反沒(méi)有？直流繼電器基本帶反向二極管的，除了起指示燈作用還可以保護PLC輸出晶體管。接反了，電源不太高的情況，繼電器不會(huì )動(dòng)作的。

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