Hiding Inputs of User-Defined FBs

You can hide the inputs of a user-defined function block when calling the function block in FBD/LD and NOLD worksheets. Hidden formal parameters are not visible in the graphical code worksheet in which the FB is used. Each hidden input can be assigned a default constant value when calling the FB in the code worksheet using the parameters editor (see procedure below).

Observe the following:

The hidden property can only be configured for input formal parameters of user-defined function blocks (i.e., the function block's input variable must have the 'Usage' = 'Input').
The hidden property is not available in safety-related POUs.

Proceed as follows to define whether a function block input is to be hidden or visible when calling the FB:

Open the 'Variables' table of the user-defined function block.
For the input variable of the FB ('Usage' = 'Input'), check the 'Hidden' checkbox to hide the input in the code worksheet where it is used or uncheck it to display the FB input.
Optional: Assign a default constant value to an hidden input.
Open the code worksheet where the user-defined FB is used and select the FB. The parameters editor is displayed on the right of the code editor (the editor is only displayed if a user-defined FB with at least one hidden input is selected in the worksheet).
In the 'Value' column enter the desired constant value (the value must be of the type declared for the input variable).