Rockwell Automation Logix5000 Controllers Sequential Function Charts Programming Manual - Manual (Page 30)

Chapter 1 Design a sequential function chart
The transition is the physical conditions that must occur or change in order to go
to the next step.
Transitions occur in these structures.
For this structure Make sure that
Sequence A transition is between each step.
Selection branch Transitions are inside the horizontal lines.
Simultaneous branch Transitions are outside the horizontal lines.
Define the transition
conditions
30 Rockwell Automation Publication 1756-PM006F-EN-P - October 2014