A Method for Creating Ladder Diagrams from Timing Diagrams as Sequential Circuits

In this paper, I focus on the scan processing method called cyclic scan as the execution method of PLC (Programmable Logic Controller) and introduce the discrete time based on such execution method. I propose a method that divides the time axis of a TD (Timing Diagram) using the discrete time and configures the behavior of the TD in the divided time interval such as a sequential circuit. I show that if a sequential circuit is obtained, the TD can be directly converted into LD (Ladder Diagram) which is a programming language of PLC. I also discuss the effect when a function block of timer has been used in PLC.