如果接线端上的电压值不正确,检查输入区域的设备,是否是设备或与之相连的线路有问题.如果输入模板的输入都不工作,那可能是外部的输入电源有故障,没有送电,或者没有正确连接。(输入和输出设备通过-个外部电源提供电源,不由模板内部供电)。输入模板没有保险,所以上面图表中保险的LED指示灯不适用于输入模板.输出模板的L D指示当一个离散型输出地址(%Q)在梯形图语句中置位后,与之对应的输出LED指示灯点亮,表明该信号已传递到模板.
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