Parameter Node

R2026b

Process tokens through a nested activity

Since R2024a

• 

Parameter Node block

Description

A parameter node acts as a buffer for object tokens and directs tokens into or out of a nested activity. The directionality of the parameter node represents input or output. You can connect parameter node by object flows.

For an action node with activity behavior type, when you create a pin, the software creates a corresponding parameter node inside the nested activity.

These are the two types of input and output parameter nodes:

• Streaming parameter node

  

• Non-streaming parameter node

  

Parameters

Parameter Node

Parameter nodes act as buffers for object tokens during execution of a nested activity. Parameter nodes inherently affect the corresponding pins.

Name — Name of parameter node

string

Name of the input or output parameter node. By default inheritance, the parameter is called InputPin or OutputPin depending on its configuration. As you add more input or output pins to action nodes, increasing numerical suffixes are added to InputPin or OutputPin, respectively.

Data Mode — Mode of data for root activity

signal (default) | message

The mode of data accepted by the parameter node of a root activity. If Data Mode is set to Message, you can edit the Lower Bound, Upper Bound and Is Streaming parameters.

Note

If an activity diagram is referenced within a Simulink^® model or System Composer™ architecture, Data Mode determines the type of data that is accepted at component port or interface.

Lower Bound — Minimum number of tokens required to begin execution

1 (default) | positive integer

The minimum number of tokens required at a parameter node for the corresponding action node to begin or complete execution.

Upper Bound — Maximum number of tokens a pin can hold or produce

1 (default) | positive integer

The maximum number of tokens that a parameter can hold. If a parameter has an upper bound greater than one, it can hold multiple tokens.

Is Streaming — Option to enable or disable streaming

off (default) | on

Enable or disable streaming for the input or output parameter node. The value of this streaming control automatically applies to the corresponding input or output activity pin of the action node.

Stereotype — List of stereotypes from imported profiles

names of available stereotypes

This list contains stereotypes from imported profiles. To assign a stereotype to a parameter node, select the stereotype from the list.

You can also use <new/edit> option to manage profiles using Profile Editor.

Object Type

An input or output pin can handle object tokens of a certain type. In the Property Inspector, the Object Type section for a pin allows you to specify the type and other properties of an object token.

Name — Object type held by parameter node

<owned> (default) | <inherit> | custom type

The type of object held by a parameter node.

• <owned> — Select properties for an object token, such as type, dimension, complexity, and unit from the Property Inspector.

• <inherit> — Inherit the object type from the previous pin.

• custom type — Choose from the list of custom types you created using the Types Editor.

Direction — Direction of token flow through a parameter node

Input | Output

This parameter is automatically set to Input or Output, depending on whether you create an input pin or output pin, respectively.

Type — Token data type

double (default) | single | int8 | uint8 | int16 | uint16 | int32 | uint32 | int64 | uint64 | boolean | MATLAB Class

Data type of the token. For more information on using MATLAB class type, see Model Complex Objects in Activity Diagrams Using MATLAB Class Tokens.

Dependencies

To enable this parameter, set Name to <owned>.

Dimensions — Token dimensions

1 (default) | positive integer

Dimensions of the token.

Dependencies

To enable this parameter, set Name to <owned>.

Unit — Token unit

string

Custom unit that you assign to the token.

Dependencies

To enable this parameter, set Name to <owned>.

Complexity — Token complexity

real (default) | complex | auto

Complexity of the token.

Dependencies

To enable this parameter, set Name to <owned>.

Version History

Introduced in R2024a

R2026b: Lower bound and upper bound parameters to configure required and optional pins

Starting in R2026b, the Token Multiplicity parameter has been replaced by Lower Bound and Upper Bound parameters for parameters and pins.