【摘要】 通过总结目前普遍使用的组合逻辑函数法、功能转移图法、Petri网分析法等可编程控制器程序设计方法,提出了一种面向对象的可编程控制器程序设计方法。依照面向对象技术的思想,详细阐述了在可编程控制器程序设计中如何构造底层的基本控制对象类及其高层的对象模型封装类。给出了外部信号的定义并且例举了对象模型同外部信号的交互情况。最后再深入分析面向对象方法的优良性能。更多还原

【Abstract】 Based on the summary of several widely -used PLC program design methods such as Modular Logic Function , Function Transfer Diagram ,Petri Net Analysis, this paper represents an Object-Oriented Methods for designing PLC program,and explicates how to construct the basic control object class and high -level object model class , The term of external signal is also defined in this paper and the interactions among object model and external signals are illustrated by two examples . Compared with other methods, this paper analyzes the property of Object Oriented Methods in depth.更多还原