Series topology

A series topology consists of a linear ordering of steps and transitions. Steps in the sequence execute directly one after another in series without any branching or looping. The following example shows an Equipment Sequence diagram that uses a series topology.

Item	Name	Description
	Initial step	When the sequence is commanded to START, this step becomes active.
	Transition	When this transition becomes TRUE, the first step in the sequence becomes active.
	Steps in series sequence	Each step becomes active and executes when its preceding transition becomes TRUE.
	Transition	The last transition in the series.
	End step	When the end step changes to COMPLETE, the Equipment Sequence becomes complete.