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文章介绍了通过可编程序控制器的通信口外接模拟量输入输出模块的方法和具体实现。这种方法不仅可以充分利用可编程序控制器灵活多功能的特点，而且还可以针对控制对象的特点采取特殊的处理，是具有一定通用性的切实可行的方法。
The article introduces the method and concrete realization of the analog input and output module through the communication port of PLC. This method can not only take full advantage of the flexible and versatile PLC features, but also can take special treatment for the characteristics of the control object, which is a practical method with certain generality.