摘要
针对只有一条左侧母线且各个元器件及类型独立的梯形图,提出一种由可编程逻辑控制器(PLC)梯形图生成指令表的算法。在该算法中使用虚结点,先将梯形图转换为AOV图,然后根据结点类型和它们在AOV图中的拓扑排序将梯形图转化为指令表。该算法是一种能将任意复杂的梯形图转换为指令表的通用算法,它已经成功地应用于软PLC的设计。
The paper presents an algorithm for generation of instruction fist（[L） code from programmable logic controllers（PLC） ladder diagram（LD） based on treating LD as a tree with single root left bar and treating LD component separately in accordance with their type. This algorithm uses virtual nodes. The LD is presented as an activity on vertex （AOV） diagram. Then it establishes activity on a vertex to transform LD to IL. The algorithm for transformation from any complex LD to IL. It has been applied in the design of a software PLC and successfully complied to IL.
出处
《信息技术》
2012年第6期75-78,共4页
Information Technology
