Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Scaricare il pdf (Pagina 75)

Program a sequential function chart Chapter 2

As you program your routine, periodically verify your work.

1. In the top-most toolbar of the application window, click

2. Follow these steps if any errors are listed in the Output window.

a. To go to the first error or warning, press F4.

b. Correct the error according to the description in the in the Output

window on the Search Results tab.

c. Go to step 1.

3. To close the Results window, press Alt+1.

To check your SFC, you can use either of these options.

• Force transitions

• Step through the SFC

See the chapter on Force steps on page 77

Firmware revision 13 added support for editing SFCs online. When you

transition the controller to test or un-test edits, the controller resets the SFC and

starts execution at the initial step. Keep these guidelines in mind if you edit an

SFC online.

• Time when you test or un-test edits to coincide with the SFC execution of

the initial step.

• Place structured text logic in subroutines to minimize the impact of online

edits.

• Use an SFR instruction to programmatically shift SFC execution to the

correct step.

Maintain active SFC step

As of firmware revision 18, the following online edits to an SFC no longer reset

the SFC to the initial step.

• Modify structured text in actions and transitions

• Physically move steps, actions, and transitions on SFC sheets without

changing the wiring

• Add, delete, or modify text and description boxes

Verify the routine

Edit an SFC online

Rock well Automati on Publication 1756-PM006F-EN-P - Oct ober 2014 75

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Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Pagina 75