Sequential Function Chart (SFC)

The SFC language is a state diagram.

Graphical steps are used to represent stable states.
Transitions describe the conditions and events that lead to a change of state.
Using SFC simplifies the programming of sequential operations because it saves a lot of variables and tests just for maintaining the program context.

Do not use SFC as a decision diagram.
Using a step as a point of decision and transitions as conditions in an algorithm must never appear in an SFC chart.
Using SFC as a decision language leads to poor performance and complicate charts.
ST must be preferred when programming a decision algorithm that has no sense in term of program state.

These are basic components of an SFC chart:

Chart	Programming
SFC Steps SFC Transitions Create SFC Parallel Branches Jump to an SFC Step	Actions in an SFC Step Timeout on an SFC Step Condition of an SFC Transition SFC Execution at Runtime

The KAS-IDE fully supports SFC programming with several hierarchical levels of charts (e.g., a chart that controls another chart).

Working with a hierarchy of SFC charts is an easy and powerful way for managing complex sequences and saves performances at runtime.

See these sections for more information: