一种比较IEC 61131-3图形程序的方法

R. Jetley, A. Rath, V. Aparajithan, D. Kumar, V. Prasad, S. Ramaswamy
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引用次数: 6

摘要

IEC 61131-3是一个开放标准,为可编程逻辑控制器和控制系统提供指南。该标准定义了文本和图形两种控制系统编程语言的规范。使用这些语言开发的控制系统应用程序在项目的生命周期中可能会经历多次更改。虽然使用传统的文本差异算法可以检测文本程序中的差异,但对于图形控制系统程序,没有有效的方法可以在粒度、语义级别上跟踪变化。在本文中,我们提出了一种比较图形化IEC 61131-3程序的方法,特别是那些使用功能框图和顺序功能图符号编写的程序。为了执行这种比较,我们用XML格式表示程序,并使用它来比较各个元素。计算差异,然后在一个定制的图形查看器中呈现程序,该查看器突出显示程序之间的变化。我们为图形化的IEC 61131-3程序实现了一个原型比较实用程序,并展示了它如何帮助减少人工审查和维护活动所涉及的工作量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An approach for comparison of IEC 61131-3 graphical programs
IEC 61131-3 is an open standard that provides guidelines for programmable logic controllers and control systems. The standard defines specifications for control system programming languages, both textual and graphical. A control system application developed using these languages can go through several changes over the course of the project's life-cycle. While differences in textual programs can be detected using traditional text difference algorithms, there exist no effective means for tracking changes at a granular, semantic level for graphical control system programs. In this paper, we present an approach for comparison of graphical IEC 61131-3 programs, specifically those written using the Function Block Diagram and Sequential Function Chart notations. To perform this comparison, we represent the programs in an XML format, and use this to compare individual elements. The differences are computed and the programs are then rendered in a customized graphical viewer that highlights changes between programs. We implement a prototype comparison utility for graphical IEC 61131-3 programs and show how it can help reduce the effort involved in manual review and maintenance activities.
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