Introduces the detail hardware structure, software configuration, the concrete PLC configuration and communication mode, the PLC programming method and diagram flow of the distributing system.
详细阐述了该系统的硬件结构及软件组成以及PLC的具体配置，该系统的具体通信方式及下位机软件的编程思想及方框流程。
Research purposes: the purpose was to make readers to learn the basic instruction, control way, programming concept and programming method through the analysis of several control programmes of PLC.
研究目的：通过对几个PLC控制程序的分析，使读者了解PLC程序的基本指令、控制方式和编程思想，初步掌握PLC的编程方法。
In this paper, the authors introduce a method of programming for fault number retrieval with PLC.
本文介绍了利用可编程序控制器（PLC）进行故障号检索的编程方法。
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