The way of ladder diagram analysis for small compact programmable controller

摘要

The paper presents the considerations relating to the ways of analysis of ladder diagram created for small programmable controller (PLC) compact type which is equipped with simple keyboard for entry of such diagram. Because of the fact that compact PLC was built with using of standard microcontroller which calculation power is small the authors met difficulties with translation of the control program to the binary code. It was necessary to make decision that a ladder diagram will be not compiled but interpreted during program execution. The method of column by column analysis of ladder diagram was chosen as the most effective. The particular application of this method for small compact PLC is presented in details in the paper.