Set flow trigger
Overview and Key Concepts
The Set flow trigger activity sets an input or an output trigger on the specified object(s).
It is equivalent to setting the
input/output.triggerAmount property, or the
Typically this activity is followed by a Wait For Event activity awaiting the On Input or On Output event of the object.
The Set flow trigger activity only allows one connector out. See Adding and Connecting Activities for more information.
The following image shows properties for the Set flow trigger activity:
Each of these properties will be explained in the following sections.
Used to change the name of the activity. See Name for more information about this property.
The Font button opens a window to edit the activity's background color and font properties. See Font for more information about this property.
The Statistics button opens the activity's statistics window. See Statistics for more information about this property.
Object(s)/ Group / Array
Use the Object(s) / Group / Array box to specify the object(s) you want
the activity to affect. You can specify a single object (using the eyedropper tool or a
command), an object group (flat or nested) or an array of objects and/or groups. When a token
enters the activity, the expression will be parsed recursively such that arrays of groups or groups will
be properly handled.
Specify if you want the activity to set the trigger on the inflow volume or on the outflow volume.
Amount; Absolute / Relative / Interval
Enter an amount, or a calculation returning the amount. If the
Object(s) / Group / Array
field evaluates to multiple objects, the amount will be calculated for each object separately (and
passed in as the
The radio buttons specify how this amount should be interpreted:
The flow trigger will be set on the exact input or output amount specified. If the cumulative flow of the object has already exceeded this amount, an error message will occur.
The flow trigger will be set for the specified amount of flow
The flow trigger will fire after the specified amount of flow, as for the 'relative (after)' option, but instead of firing once it will fire every time this amount of flow has entered or left, until the trigger interval is cancelled by setting the interval amount to zero, or setting a (one-off) trigger amount instead of an interval.
If the condition is not set to "Always", the activity will only perform its functionality when the
true. If the Object(s) / Group / Array
field evaluates to multiple objects, the condition will be checked for each object separately (and
passed in as the
The dropdown suggests a few common conditions, such as only working on objects that currently have
inflow, or are below their maximum content. You can use it to implement logical conditions (e.g. only open
output if a tank is full), but also for model constraints (e.g. only do something with output port 2
involved object has at least two output objects).