Most of the faults related to the PLC are the peripheral interface signal failure,so during maintenance,as long as some parts of the PLC control the action normally,the PLC program should not be suspected.If it is confirmed through diagnosis that the operation program has output,but the physical interface of the PLC has no output,the hardware interface circuit is faulty.In addition,there are more hardware failures than software failures,most of which are caused by the insufficiency of external signals or the failure of executive components,rather than the problems of the PLC system.
大多数有关PLC的故障是外围接口信号故障,所以在维修时,只要PLC有些部分控制的动作正常,都不应该怀疑PLC程序。如果通过诊断确认运算程序有输出,而PLC的物理接口没有输出,则为硬件接口电路故障。另外硬件故障多于软件故障,大多是由外部信号不满足或执行元件故障引起,而不是PLC系统的问题。
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