C 5 Sequential Function Chart Display; C 5.1 General Description - Sfc Display - ABB Freelance 2000 Manual

Section C Standard Displays

C 5 Sequential Function Chart Display

C 5.1 General description - SFC display

The Sequential Function Chart (SFC) is a user-defined net of steps and transitions.
The action block is defined as a step and the step-enabling condition as a transition. Steps and
transitions are represented by graphic symbols. The representation, symbol type and color of the
symbols depend on the status of the steps and transitions.
Each SFC program begins with an Initial Step and ends with an End Transition. All steps are
inactive during initialization of the SFC program.
The initial step is activated at the start of the SFC program, all other steps are inactive. The start
of the SFC program begins with its Enable, i.e. New Start or Repeat Time have been reached or
have expired.
The end transition terminates one sequence function chart run, after which all steps are once
again in the inactive state.
For configuration of the sequence function chart (SFC) and definitions see Engineering
Manual, IEC 61131-3 Programming, Sequence Function Chart (SFC).
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