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SysML Internal Block Toolbox

When you are constructing SysML models, you can populate the Internal Block diagrams using the icons on the 'SysML Block Internal' pages of the Diagram Toolbox.

The Block that owns the Internal Block diagram is automatically represented by a diagram frame enclosing the Internal Block diagram elements. You can:

  • Hide the frame by right-clicking on the diagram and selecting the 'Hide Diagram Frame' option (and show it again by selecting the 'Show Diagram Frame' option); if the diagram frame is shown, the 'Diagram Frame' settings on the 'Start > Workspace > Preferences > Diagram' page will be ignored
  • Make the frame selectable to move or resize it, by right-clicking on it and selecting the 'Selectable' option
  • Create Ports and Parts on the frame and create connectors between them
  • Generate Property elements on the diagram inside the Block frame, based on the Associations that the Block element has on the Block diagram


On the Diagram Toolbox, click on the More tools button and select 'SysML 1.3 | SysML 1.3 Internal Block'.


Design > Diagram > Toolbox

Keyboard Shortcuts


SysML Block Internal



See also


Describes the decomposition of a SysML Block in the context of its whole using instances of reusable SysML Blocks.

Connector Property

Creates an instance of an Association Block.

Distributed Property

Creates a stereotype of Property, to apply a probability distribution to the values of the property.

Flow Property

Creates a single kind of Flow element that can flow to or from a block.

Participant Property

Creates the end of a connector owned by an Association Block.


Defines a SysML message, containing attributes, exchanged between system Blocks in an interaction.


Describes a structural interaction point of a SysML Block which, in turn, connects between interacting parts of a block.

SysML Block Internal Relationships



See also


Establishes a traceable relationship describing how one element is dependant upon another.

Item Flow

Specifies the items that flow across a connector in an interaction point. Used in the same way as UML Information Flows.

Using Information Flows


Establishes Communication links between parts.


Binding Connector

Establishes a connection between two parts in a system decomposition.

SysML Deprecated



See also

Flow Port

Describes what flows in and out of interacting SysML Blocks.

Flow Specification

Defines a set of flow properties that correspond to individual pieces of a common interaction point.

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