Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Scaricare il pdf (Pagina 32)

Chapter 1 Design a sequential function chart

If you want to Then

Enter the conditions as an expression in structured text. Use a BOOL expression on page 32

Enter the conditions as instructions in another routine. Call a subroutine on page 68

Use the same logic for multiple transitions.

Use a BOOL expression

The simplest way to program the transition is to enter the conditions as a BOOL

expression in structured text. A BOOL expression uses BOOL tags, relational

operators, and logical operators to compare values or check if conditions are

TRUE or FALSE. For example,

tag1>65.

Call a subroutine in a transition

To use a subroutine to control a transition, include an End Of Transition (EOT)

instruction in the subroutine. The EOT instruction returns the state of the

conditions to the transition, as shown below.

- or -

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

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Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Pagina 32