31C
在诊断输入输出故障时，方法是区分究竟是模块自身的问题，还是现场连接上的问题。如果有电源指示器和逻辑指示器，模块故障易于发现。通常，先是更换模块，或测量输入或输出端子板两端电压测量值正确，模块不响应，则应更换模块。若更换后仍无效，则可能是现场连接出问题了。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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