Conditions that must be met (e.g., a sensor being triggered) before moving from one step to the next.

The was established to provide a unified framework for Programmable Logic Controllers (PLCs) . It abstracts vendor-specific differences by offering five core languages, ranging from graphical tools like Ladder Diagrams to textual ones like Structured Text. SFC is unique within this group because it functions as a higher-level organizational language. It allows engineers to partition a program into logical units, making the entire system easier to troubleshoot and maintain. Structure and Execution An SFC consists of three primary components:

Rectangles representing specific states of the process (e.g., "Wait," "Close Door").

Logix 5000 Controllers Design Considerations Reference Manual