Pass Parameters; Configure When To Return To The Os/Jsr - Allen-Bradley Logix 5000 Programming Manual

Controllers sequential function charts

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Chapter 1

Design a sequential function chart

Pass parameters

Configure when to return to

the OS/JSR

To pass parameters to or from an SFC, place a Subroutine/Return element in the

SFC.

By default, an SFC executes a step or group of simultaneous steps and then returns

to the operating system (OS) or the calling routine (JSR).

You have the option of letting the SFC execute until it reaches a false transition. If

several transitions are TRUE at the same time, this option reduces the time to get

to the correct step.

Select the Execute until FALSE transition option only when either of these are

true:

•

You do not have to update JSR parameters before each step. Parameters

update only when the SFC returns to the JSR.

•

A FALSE transition occurs within the watchdog timer for the task. If the

time that it takes to return to a JSR and complete the rest of the task is

greater than the watchdog timer, a major fault occurs.

Rockwell Automation Publication 1756-PM006I-EN-P - February 2018

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