限位感應(yīng)器,感應(yīng)正常(接觸時(shí)常亮,未接觸時(shí)常滅),指示燈正常。PLC監(jiān)控時(shí),當(dāng)感應(yīng)器接觸,指示燈亮起后,再移開,常開觸點(diǎn)長(zhǎng)ON,也就是在不感應(yīng)時(shí),常開觸點(diǎn)也是ON的。PLC程序中對(duì)常開觸點(diǎn)(ON狀態(tài))強(qiáng)制OFF,無反應(yīng)(感應(yīng)器未感應(yīng))。這種考慮是感應(yīng)器問題,還是??