Rockwell Automation 1753-PCS-PAR Using RSLogix Guard PLUS! with GuardPLC Controllers - Manual (Page 89)

Publication 1753-PM001A-EN-P - November 2005
Create User-Defined Function Blocks 8-3
4. Double-click the new function block to start the editor.
The FBD editor for user-defined function blocks differs slightly from
the FBD editor for routines. The components of the editor are:
Overview
Window
Interface
Declaration
Editor
Drawing
Field
Variable Declaration Editor
Use this component To
Overview Window displays the function block diagram in reduced scale.
Drawing field create the logic of the FB-type.
Variable declaration editor
(only in FB type editor) create and define internal variables of a block and initialize them for further use.
Interface declaration editor
(only in FB type editor) define the graphical appearance of a block.
The appearance of the block will match the appearance of the user-defined function block
in the FBD Editor.
IMPORTANT
You cannot place an instance of a user-defined
function block within itself.