Use

You define changing parameters in function calls and input validations for the following changing parameters of the function module or check function:

To the parameter, you assign the variable whose value you want to transfer from the PI sheet to the function module. After the function has been carried out, the system returns the parameter value to this variable.

Changing parameters of function calls are displayed in the PI sheet.

You can also use the variable to transfer the value to succeeding process instructions of the same PI sheet. However, note the following:

Prerequisites

The variable you assign to the parameter has been defined in a preceding process instruction of the same PI sheet or for the entire process order (see Use of Variables ).

Features

When defining a changing parameter, you specify the following information in the process instruction:

In the PI sheet, the text is displayed before the parameter value.

In input validations, you need not define a text since the parameter values are not displayed in the PI sheet.

To enter this information, you assign the following characteristics to the process instruction:

Notes on Variable Assignment

You can only transfer the value of a variable to a parameter if it has the same data type as the parameter in the function module.

The data type of a variable is identical to that of the value to which it refers.

Depending on the data type, you must use one of the following characteristics to assign the variable in the process instruction: