Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Scaricare il pdf (Pagina 16)

Chapter 1 Design a sequential function chart

If Then

• The SFC is the only routine in the program

• The SFC calls all the other routines of the program

Configure the SFC as the main routine for the program.

•

The program requires other routines to execute

independent of the SFC

• The SFC uses Boolean actions

1. Configure another routine as the main routine for the

program.

2. Use the main routine to call the SFC as a subroutine.

If the SFC uses Boolean actions, then other logic must run independent of the

SFC and monitor status bits of the SFC.

A step represents a major function of your process. It contains the actions that

occur at a particular time, phase, or station.

A transition ends a step. The transition defines the physical conditions that must

occur or change in order to go to the next step.

Step guidelines

Follow these guidelines.

• Start with large steps and refine the steps in several passes.

Define the steps of the

process

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

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Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Pagina 16