求翻译：本课题介绍利用PLC S7-200对三工位旋转工作台的控制，根据其控制要求和特点，阐述了控制方案，确定其PLC的输入、输出、分配，并设计出顺序功能图和梯形图。随着社会经济的不断繁荣与发展，PLC已经在工业生产过程的自动控制中得到更广泛的应用。PLC有结构比较简单，编程较简易，高可靠性，方便维修以及使用方便等优点。目前，三工位旋转工作台越来越得到广泛的应用，它是通过在加工的同时完成上料和卸料的操作的过程，这样不仅大大的提高了工作效率，而且降低工人们的劳动强度，使得流水作业更快。是什么意思？

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This topic describes the PLC S 7 - 200 to 3 position rotary table control, according to its characteristics and demands, control on the control program to determine its PLC input, output, distribution, and design a Sequential Function Chart and ladder. With the economic and social development, and h

This topic describes three-station rotary table control using PLC S7-200, according to the requirements and characteristics of its control, control programmes have been elaborated, determine their PLC input, output, distribution and design of sequential function chart and ladder. With the continuous