Sequential Function Charts

 Sequential Function Charts

     A Sequential Function Chart (SFC) is a set of scripts that are defined in one place and then executed in order. Components in the chart can influence where the chart's flow will go. Charts can loop continuously or run for a specific number of times before stopping. Sequential Function Charts are based on the IEC 61131-1 standard, which includes a graphical programming language. This language is one of the most often used for programming PLCs, therefore PLC programmers may be familiar with it.

     SFCs are used to execute logic in more structured ways than Python scripts or PLC programming alone. They aid in the illumination of logic for users and promote intuitive development and improvement due to their intrinsic visual representation. Charts may be visually viewed as they run, making troubleshooting easier than with only scripting.