addTag

An activity describes system behavior that models the flow of tokens from inputs to outputs through a controlled sequence of actions. An activity contains activity nodes and flows.

Use activity elements to create a clear, visual representation of the workflow like a dynamic flow chart. You can use an activity object either at the top level of the model or as a nested activity within an action to describe behavior at different levels of the system.

An activity diagram is a visual representation of an activity.

Use activity diagram to conceptualize a system, visualize functional flow through actions or decisions, and understand how system components interact with one another.

An activity diagram model is the file that contains activity information, such as action nodes, control nodes, flows and tokens.

Perform operations on a model including extracting top-level activity, applying profiles or linking interface data dictionaries. An activity model is stored as an SLX file.

Tokens are objects that flow in the activity diagram. A token can represent data such as structures and integers, or a token can simply pass on the control.

An object token represents an object, such as a piece of data. A control token represents a control or a triggering event that does not carry any data.

An action node is a key building block in an activity diagram. An action node represents an action to be executed. Action nodes consume input tokens and produce output tokens on pins.

Use a MATLAB^® function or a nested activity diagram to describe the behavior of an action node.

A control node routes a logical flow of tokens through the system.

Use control nodes and flows to route tokens. Control nodes can be used to initialize, split, merge, and terminate token flows.

A pin acts as a buffer for object tokens and directs tokens into or out of an action node. The directionality of the pin represents input or output. You can connect pins by object flows.

Use pins to route an object token to or from an Action Node. Pins are also used to store object tokens before or during execution. You can use pins only for object flows.

A type defines the contents of a token that flows through a pin. A type has dimension, unit, complexity, minimum, maximum and description.

A value type token is a type assigned to a single value. A composite type token is equivalent to a bus structure that contains field of different values and data types. A MATLAB class type token references a MATLAB class on the path that defines a complex object with properties and methods. You can use a built-in MATLAB class or define your own MATLAB class.

A parameter node routes tokens into or out of a nested activity diagram. When a pin is created, a corresponding parameter node will be created inside the nested activity.

Use a parameter node to define how tokens enter or leave a nested activity. There are two types of parameter nodes input and output.

Use Nested Activity to Describe Action

A flow in an activity diagram connects two nodes. A dashed line represents a control flow. A solid line represents an object flow.

Tokens in an object flow contains token data on which actions operate. You can use object flows to route input or output tokens to carry information or physical items between object nodes. Tokens in a control flow trigger the execution of actions. You can use control flows to model transfer of control from one Action Node to another.