Which programming language is used to create graphical diagrams in PLCs?

The programming language specifically designed for creating graphical diagrams in programmable logic controllers (PLCs) is Ladder Logic. This language mimics electrical relay logic systems, making it easy for technicians and engineers with a background in electrical wiring to understand and implement control systems.

Ladder Logic is represented in a visual format that resembles a ladder, where the vertical lines represent power sources and the horizontal lines represent control paths. This makes it intuitive for users to visualize the operations and sequences of the control system, which is essential in industrial automation.

While other languages like Structured Text, Function Block Diagram, and Sequential Function Chart exist within the context of PLC programming, they are suited for different purposes and are not primarily focused on creating graphical diagrams. Structured Text is more akin to traditional programming languages, Function Block Diagram is useful for defining complex function blocks, and Sequential Function Chart is designed for outlining steps in sequential processes but lacks the familiar visual format of Ladder Logic.