这是一本介绍欧姆龙PLC编程手册的书，读者通过本书可以学习到PLC编程的一般步骤和知识，同时了熟悉了欧姆龙PLC的知识。-This is an Omron PLC programming manual book, readers can learn through the book to the general steps and knowledge of PLC programming, at the same time familiar with the knowledge of the O