基于AOV图存储PLC梯形图的方法  

PLC ladder diagram editing method based on AOV diagraph and conversion algorithm to instruction list

作　　者：张惠杰[1] 林伟敏[1] 

机构地区：[1]福州大学数学与计算机科学学院,福建福州350000

出　　处：《微型机与应用》2012年第16期70-73,共4页Microcomputer & Its Applications

摘　　要：提出一种直接以AOV(Activity On Vertex)图存储PLC(Programmable Logic Controller)梯形图的方法。编辑梯形图的同时,修改AOV图,然后根据AOV图的拓扑结构更新梯形图图符坐标,最后进行绘制显示。该方法无需进行梯形图向AOV图的转换,通过操作规则的约束来替代语法的检查,使梯形图的编辑更加便捷和规范。详细介绍了AOV图的编辑过程和坐标的更新算法。对AOV图向二叉树的转换算法进行修改,使其能适应于所有AOV图,并给出了相应的实例。A PLC ladder diagram （LD） editing method using AOV diagraph to restore LD directly is proposed. AOV diagraph will be changed when the LD is being modified. Then updates LD symbol coordinates according to the structure of the AOV dia- graph and display the LD to user. The method does not need a conversion from LD to the AOV diagraph and alternates syntax check by the constraints of the operating rules, which makes LD editing more convenient and norms. The AOV diagraph＇s editing process and coordinates update algorithm are described in detail. A modified conversion algorithm from AOV diagraph to binary tree is presented. The algorithm can adapt to all kinds of AOV diagraph, and a corresponding instance is given.

关 键 词：可编程逻辑控制器 梯形图 AOV图 指令表 

分 类 号：TM571[电气工程—电器]