You can create an empty UDF from the File → New menu command.
A UDF has a rectangle to indicate its edit area. You can edit the position and dimensions of this area.
Restrictions for a UDF:
Input (analog + digital): 8
Output (analog + digital): 4
Parameter: 8
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Note
Not all blocks can be added to a UDF. Items shown below can not be added to a UDF:
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You can also create a UDF from selected figures. To create a new UDF, select the blocks, right-click, and select "①" from the following context menu.
If the selection includes blocks that a UDF does not support, LOGO!Soft Comfort excludes them from the UDF. If an included function block is connected to an excluded one, LOGO!Soft Comfort creates an input or output in place of the excluded block. If the number of inputs and outputs would exceed the restrictions, LOGO!Soft Comfort does not make inputs or outputs that would exceed the restriction.
LOGO! Soft Comfort creates the UDF and opens it in the UDF Editor: