Element: Realization

A Realization is a UML relationship which expresses instantiation. The realizing class object implements the attributes and operations of the interface. In IEC code, this relationship corresponds to the keyword IMPLEMENTS.

A realization points from a class (type: FUNCTION_BLOCK) to an interface.

Display as dashed arrow

Properties

Table 5.

Relationship	Relationship type
Optimise route	When this option is selected, the route of the relationship arrow is optimized automatically. The fixed points are the initial point at the start element and the final point at the end element. For example, if the end element is moved, then the point where the arrow points to the end element remains the same. When this option is deselected, the route remains unchanged. As soon as a relationship element is positioned manually in the class diagram, this option is deselected. Select this option if automatic optimization is required.
Start element	Name of the element where the relationship element starts
End element	Name of the element that the relationship element points to
Identifier	For the Association and Composition relationships only Name of the relationship element

User input

Action	Description
Select the Realization tool . Click a class. Click the interface that should be implemented. The Select Implementation Language dialog opens. Select an implementation language and click OK to exit the dialog.	A realization is drawn between the elements. The IEC code is adapted automatically by specifying the interface in the declaration part of the class. Example: `Class_1 IMPLEMENTS Itf_2`
Select the Realization tool . Select a class. Click a blank area in the diagram. The Add Interface dialog opens. Specify a name, configure the settings, and click Add to exit the dialog. The Select Implementation Language dialog opens. Select an implementation language and click OK to exit the dialog.	A new interface has been added. A realization is created that points from the class to the new interface. The IEC code is adapted automatically by specifying the interface in the declaration part of the class. Example: `Class_1 IMPLEMENTS Itf_2`
Select the Choice tool. Click a realization. Move the line.	The lines are changed. The Optimise routing property is deselected automatically.
Select the Choice tool. Click a realization. Press the Del key or click Delete in the context menu.	The realization is removed from the diagram and IEC code. The statement `IMPLEMENT` is removed from the declaration part of the class.

Example

Example 18. Realization of an interface

Class_A implements Itf_A:

View of Class_A in the POUs view: