As the system controls is a typical process control and most steps are controlled in time order, so PLC-based distributed control method is suitable.

由于该系统控制对象为典型的流程控制，而且其中大部分工步为时间顺序控制，因而适合采用PLC为基础的分散型控制方法。

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The paper studies seven typical post-controlled vocabulary models, analyzes their basic principles, outlines their process procedures with examples and evaluates their performance.

本文将后控词表实现模式分为七类，在分析了各自的原理后，结合实例阐述了词表的实现过程，最后评价了各种模式的特性。

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