Develop customized behavior for entities at an activity. In addition to the information set in the General tab of the activities properties dialog, logic can be developed to report statistics, control processing, collect information and a host of other items. Variables, entity attributes, systems information and if-then statements allow expansive capabilities to be accessed from the action tab.
Action logic is processed when the entity enters the Capacity of an activity, and then entities also process the time entered on the General tab. For this reason, when action logic is used, often a TIME statement is included in the action logic and the General tab time is set to 0.
Action logic does not occur in the Input Queue of an activity. If a situation requires action logic in the input queue, see the model object “Flow control – action logic in the input queue”
For additional information see Section 3.11, Action Logic.