Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sequential function chart (SFC) is a graphical programming language used for PLCs. It is one of the five languages defined by IEC 61131-3 standard. The SFC standard is defined in IEC 848, "Preparation of function charts for control systems", and was based on GRAFCET (itself based on binary petri nets).Steps are activated when all steps above it are active and the connecting transition is superable (i.e. its associated condition is true). When a transition is passed, all steps above are deactivated at once and after all steps below are activated at once.

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