Loop topology

A loop topology has a path of execution that links back into a preceding step to create a loop which repeats the execution of steps. The example shows an Equipment Sequence diagram that contains a sequence loop.

Item	Name	Description
	Transition preceding a branching structure	This transition serves to stop the preceding step and start its following step, just as any transition does in a series.
	Selective convergence	This is the way the loop structure is entered.
	Selective divergence	This is the way the loop structure is exited.
	Transition after the selective divergence branch for the loop	If the transition in the loop evaluates as true, the loop becomes the execution path.
	Transition after the selective divergence for the non-loop path	If the transition in this path evaluates as TRUE, this path is the execution path.