Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Scaricare il pdf (Pagina 12)

Chapter 1 Design a sequential function chart

A sequential function chart (SFC) is similar to a flowchart. It uses steps and

transitions to perform specific operations or actions. This example shows the

elements of an SFC. The SFC continues on the following page.

A step represents a major function of y

our process. It contains the actions that occur at a particular time, phase,

or station.

An action is one of the functions that a step performs.

A transition is the TRUE or FALSE condition that tells the SFC when to go to the next step.

A qualifier determines when an action starts and stops.

A simultaneous branch executes more than 1 step at the same time.

JSR instruction calls a subroutine.

What is a sequential

function chart?

12 Rockwell Automation Publication 1756-PM006F-EN-P - October 2014

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Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Pagina 12