FBD Variables

All variable symbols and constant expressions are entered in FBD diagrams using small boxes.

  1. Click this button in the FBD toolbar to insert a variable tag:

    Insert variable: In this mode, the mouse is used for inserting variable tags.

    Click in the diagram and drag the new variable to the desired position.

  2. Double-click a variable tag to open the variable selection box.
    See Select FBD Variables and Instances for more information.
  3. Either select the symbol of a variable or enter a constant expression.
    Variables tags must be linked to other objects (e.g., block inputs and outputs) using connection lines.
  4. Resize a variable box vertically to display, together with the variable name, its tag (short comment text), and its description text.
    The variable name always appears at the bottom of the rectangle:
Display Item Example
Description
Tag
Name

See Variables tab for more information.

Concept Link IconSee Also