对于输入模块，电源LED显示表明输入设备处于受激励状态，模块中有一信号存在。该指示器单独使用不能表明模块的故障。逻辑LED显示表明输入信号已被输入电路的逻辑部分识别 。如果逻辑和电源指示器不能同时显示，则表明模块不能正确地将输入信号传递给处理器。输出模块的逻辑指示器显示时，表明模块的逻辑电路已识别出从处理器来的命令并接通。除了逻辑指示器外，一些输出模块还有一只保险丝熔断指示器或电源指示器，或二者兼有。保险丝熔断指示器只表明输出电路中的保护性保险丝的状态；输出电源指示器显示时，表明电源已加在负载上。像输入模块的电源指示器和逻辑指示器一样，如果不能同时显示，表明输出模块就有故障了。
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