PLC ladder diagram to instruction list conversion - Database & Sql Blog Articles

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The plc ladder diagram is composed of many steps. In the manual conversion process of the ladder diagram, the principle of top-down and left-to-right is followed, and the conversion is performed step by step. Therefore, the PLC ladder diagram is essentially a directed graph. During the drawing process, the ladder diagram shows the rows and columns of each component through the ladder diagram. The conversion process of the ladder diagram is based on the row and column coordinates of the component, and the PLC ladder diagram is first converted into a binary tree, and then the corresponding instruction is identified according to the binary tree. A ladder diagram can be seen as a series or parallel connection between contacts or circuit blocks. The circuit block is essentially composed of two or more contacts. Therefore, it is essentially the series and parallel connection of the contacts. The series is indicated by the "" sign and used in parallel. +" indicates. As shown in Figure 1.

According to the principle of top-down and left-to-right, the ladder diagram can be converted into a binary tree. The binary tree is the key to the conversion of the ladder diagram to the instruction list. Each step corresponds to one tree and two trees. The binary tree clearly expresses the relationship between the contacts by traversing the binary tree. Write the instruction list in combination with the corresponding contact type.

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