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MPC240这种故障可以认为是噪声干扰或PLC内部接触不良。一般来说，噪声是由小电容电容减小或电路板中元件性能不佳引起的。轻敲PLC本体可以检查接触不良的原因。还要检查电缆和连接器的插入状态。
典型的可编程逻辑控制器系统包括一个现场可编程逻辑控制器站、一台通过高速数据线连接到现场可编程逻辑控制器站的上位机和一个模拟屏幕可编程逻辑控制器站。上位机用于显示各种图形和数据，模拟屏PLC站用于驱动模拟屏上的led。当整个PLC系统与外部设备连接时，就构成了一个自动控制系统。
通常，PLC被视为一个黑匣子，我们可以简单地根据I/O信号来判断故障位置。判断故障有两种情况，即故障信号在模拟屏上闪烁和运行设备未在模拟屏上显示。
1.模拟屏幕上闪烁的故障信号
根据PLC控制站的图纸，先检查模拟屏PLC柜内设备的显示状态，如果一致则检查现场PLC柜的显示状态，如果一致则继续检查PLC柜的I/O端子和外部设备的I/O端子，从而推断是设备故障还是PLC故障。上述过程可以用下面的框图表示。
判断PLC机柜的I/O端子和外部设备的I/O端子是否与状态信号一致的方法非常简单。只要用万用表的DC电压档测量端子号和公共端子的电压值，24V就是断线，没有信号；0V表示开，有信号。
MPC240
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