Interpretation petri net model to IEC 1131-3: LD for programmable logic controller

Abstract

The Programmable logic Controllers (PLCs) are widely used in industrial. Thus PLCs usually used the IEC 1131-3 standard programming language. The ladder diagram is the most popular language that similar to the electrical schematic diagrams which does not require a lot of the steps and sequences of the operation. Therefore it is difficult to understand the program structure and developing the system. The Petri nets is one of graphical models that can be explained the system operating easily and clearly. This paper presents the transformation structures from Petri Nets to Ladder diagram and possible implementation to control the process through PLC's input and output. In this article can be applied to other applications on any PLCs as well.