Sequential Function Chart (SFC)
The SFC language is a state diagram. Graphical steps are used to represent stable states, and transitions describe the conditions and events that lead to a change of state. Using SFC highly simplifies the programming of sequential operations as it saves a lot of variables and tests just for maintaining the program context.
|
|
|
You must not use SFC as a decision diagram. Using a step as a point of decision and transitions as conditions in an algorithm should never appear in a 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". |
Below are basic components of an SFC chart:
|
Chart |
Programming |
The Workbench Studio fully supports SFC programming with several hierarchical levels of charts: i.e. 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 run time. Refer to the following sections for further details:
Defining a hierarchy of SFC programs
How to control a SFC child
|
Other topics in this chapter SFC execution at Runtime Service |
Sequential Function Chart (SFC) |
|
IEC 61131-3 Automation platform > Programming - Reference guide > Programming languages - Overview > Sequential Function Chart (SFC) |
|
|
Created with the Personal Edition of HelpNDoc: Maximize Your Documentation Capabilities with a Help Authoring Tool