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 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 "Integrated development environment"
An integrated development environment is a type of computer software that assists computer programmers in developing software.
IDEs normally consist of a source code editor, a compiler and/or interpreter, build-automation tools, and a debugger 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 In computer science, runtime (or run-time) describes the operation of a computer program, the duration of its execution, from beginning to termination (compare compile time).
Within KAS, runtime also refers to the virtual machine that manage the program written in a computer language while it is running.
See these sections for more information:
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