Rockwell Automation Logix5000 Controllers Sequential Function Charts Programming Manual - Manual (Page 49)

Design a sequential function chart Chapter 1
Pass parameters
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.
Configure when to return to
the OS/JSR
Rockwell Automation Publication 1756-PM006F-EN-P - October 2014 49