数控机床PLC的顺序控制及故障诊断方法

摘要

Sequence control is an advanced PLC programming methods. The fault diagnostics performed in the sequence control is an effective diagnostic way for the diagnostics of machine tool logical. By the se-quence number ( step number ) of the sequence control can know the details operation of machine tool in each sequence step and the required conditions for this operation. If the input conditions have not reached its required state within the time limit or some of them change unexpectedly in any time then a fault is genera-ted. But the faults maybe come from the input conditions or the actuators. Paper describes the mechanism of fault diagnosis based on the sequence control and describes programming methods in PLC.%顺序控制是一种先进的PLC编程方法。在顺序控制中进行故障诊断是一种有效的机床逻辑诊断方法。通过顺序控制中的顺序号(步号)可以知道机床每一步的具体动作和实现这一动作所需要的条件。在规定时间内任一输入条件没有达到所要求的状态，或者在任意时间内它们变成了不希望的状态，都是故障。这些故障可能是源于检测输入条件也可能来自执行机构。文章阐述了以顺序控制为基础的故障诊断机理，并介绍了实现的方法。