Parameters View

To access the parameters view for a user-defined function or function block

From the Application View, create a user-defined function or function block in the respective section. Right-click the function or function block, and then click Parameters
.

Use the Parameters
view to manage parameter and local variables for user-defined functions and user-defined function blocks. This view provides a graphic display of the parameters and local variables.

In the Parameters
view, define the properties of parameters and local variables:

Property	Description
Name	Name of the parameter
Alias	When supported by the application, the short name used in the graphical language editors for display only. Limited to four characters.
Data Type	Data type of the parameter
Dimension	When supported by the application, the dimension of the function block. The dimension is defined as a positive double integer (DINT) value.
Attribute	Property of a parameter indicating its read and write access rights. Possible values are Read or Read/Write .
Comment	Plain text
Initial Value	When supported by the application, the value held by a variable when the virtual machine starts the execution of the application code.

Modify the parameters for functions and function blocks. User-defined functions are limited to one output parameter with a modifiable data type.

From the Parameters
view, perform these tasks:

Task	Procedure
Create parameters and local variables	Create parameters for a currently opened user-defined function or function block. Functions can only have one output. In the Application View , right-click the required function or function block, and then click Parameters . To add an input parameter, click New Input , then define the properties for the parameter. To add an output parameter to a function block, click New Output , then define the properties for the parameter. To add a local variable, click New Variable , then define the properties for the variable.
Edit parameters and local variables	In the Application View , right-click the required function or function block, and then click Parameters . The function or function block parameters are displayed. To edit a parameter, select the parameter, and then modify its properties. To edit a local variable, select the variable, and then modify its properties.
Delete parameters and local variables	In the Application View , right-click the required function or function block, and then click Parameters . Right-click the parameter or local variable to remove, and then click Delete .
Cut, copy, and paste parameters and local variables	In the Parameters view for a user-defined function or function block, cut or copy the required parameter or local variable: To remove the parameter or local variable, select the item, right-click and then click Cut . To copy the parameter or local variable, select the item, right-click and then click Copy . To paste a copied parameter or local variable, right-click in the Parameters view and then click Paste . Duplicated parameters or local variables are automatically placed in their respective area, such as input, output, or variable. TIP:
Display data types for parameters or local variables	Expand and collapse the display of data types for all parameters and local variables of a currently opened user-defined function or function block. To expand all parameters, in the parameters view, right-click and then click Expand All . To collapse all parameters, in the parameters view, right-click and then click Collapse All .

TIP: Update each instance of a function or function block after adding, removing, reordering, renaming, changing data type, or changing direction of parameters in all POUs using the instance. Identify these POUs with the Cross Reference Browser, then open each POU and reselect the modified instance using the Block Selector.

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