Description
故障检测:plc本身有很完善的自诊断功能,但在工程实践中,plc的i/o元件如限位开关、电磁阀、接触器等的故障率远远高于plc的本身故障率,这些元件出现故障后,plc一般不会察觉出来,不会立即停机,这会导致多个故障相继发生,严重时会造成人身设备事故,停机后查找故障也要花费大量时间[4]。
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