描述
阐明PLC输出点正常,毛病点在外围。若电压较高,阐明此触点触摸电阻太大,已损坏。别的,当指示灯不亮,但对应的电磁阀、触摸器等动作,这也许此输出点因过载或短路烧牢。这时应把此输出点的外接线拆下来,再用万用表电阻档去量输出点与公共端的电阻,若电阻较小,阐明此触点已坏,若电阻无穷大,阐明此触点是好的,应是所对应的输出指示灯已坏。
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