Sequential Function Chart (SFC)
Sequential function chart - It can be used to program processes that can be split into steps.
The main components of SFC are:
- Steps with associated actions.
- Transitions with associated logic conditions.
- Directed links between steps and transitions. 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 The act of performing a sequence of instructions or commands. of
sequential operations because it saves a lot of variables and tests just for maintaining the program context.
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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 Structured text - A high-level language that is block structured and syntactically resembles Pascal. 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 |
|---|---|
The KAS-IDE Kollmorgen Automation Suite - Integrated Development Environment 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:
See Also
