Codesys Sfc Example [verified] ✨
(* SFC Specifics *) sfc_step : INT; (* For debugging step number *)
Sequential Function Chart (SFC) is a powerful, visually-driven programming language in used to structure complex PLC sequences. Unlike logic-heavy languages like Ladder Diagram, SFC organizes code into a logical flow of steps , transitions , and actions , making it ideal for processes that follow a specific chronological order, such as a manufacturing assembly line or a traffic light system. Core Elements of an SFC Example
Here is the text-based representation of the SFC. In CODESYS, you will drag/drop elements from the toolbox.
Represent a specific state of the system (e.g., "Pump_Running"). Every SFC program must have one Initial Step codesys sfc example
To understand any SFC example, you need to recognize three main building blocks: Steps (Squares):
VAR (* Inputs *) btn_Start : BOOL; (* Start Pushbutton *) sen_HighLevel : BOOL; (* High-Level Float Switch *) sen_LowLevel : BOOL; (* Low-Level Float Switch *) (* Outputs *) vlv_Inlet : BOOL; (* Inlet Valve A *) vlv_Outlet : BOOL; (* Outlet Valve *) mot_Mixer : BOOL; (* Mixer Motor *)
The operator, Dave, ran over. "Did we just lose another one?" (* SFC Specifics *) sfc_step : INT; (*
Transition from Step 20: Condition: (T#45s) AND NOT EStop_Pressed
You now have a working template for a pick-and-place sequencer. Load this into your CODESYS simulator, wire virtual inputs, and watch the steps light up in sequence.
How to handle machine ESTOP or EtherCAT loss with SFC language In CODESYS, you will drag/drop elements from the toolbox
Once you have the basic running, consider these improvements:
Sequential Function Chart (SFC) is a graphical language in the IEC 61131-3 standard
