Description
输出设备截止，输出端间电压达到某一预定值，就表明现场连线有误。若输出器受激励，且LED指示器不亮，则应替换模块。如果不能从I／O模块中查出问题，则应检查模块接插件是否接触不良或未对准。最后，检查接插件端子有无断线，模块端子上有无虚焊点。
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