Read value from data point

The "read value from data point" in the ScriptWizard enables reading one current value or more values from a data point and storing it / them in the given target variable.

Figure: Overview - Read value from data point

Structure

The following paragraphs list all fields and options of the function "read value on data point" and explain how to use them.

Data point

In the data point text field all the added data points and $-parameters are listed.

Select data point

Click on the push button in order to edit a selected DPE or $-parameter (see also Add data point element).

Description

Select a description text for the selected data point element in the description column. There are 4 options:

  • DPGet => To give the name of the data point element

  • DPGetDescription => To give the description of the data point element

  • DPGetAlias => To give the alias value of the data point element

  • DPGetUnit => To give the unit of the data point element

Target variable

Specifies in which variable the value shall be stored. The target variable is created automatically and is named by default according to the specified data point name and config. You can change the name by clicking on it. Moreover, all defined target variables are listed in the selection list. Therefore you can also select an existing variable with the combo box.

Type

The type of a data point element is recognized automatically (if possible) and an appropriate selection is met. The type can also be defined manually should the type have been recognized wrongly.

A type conversion does not take place! The type capable of accepting the value of the data point must be selected. An incompatible selection results in error in the panel!

Add data point

Opens the dialog to add a new data point element (see also Add data point element).

Delete data point

Select a data point in the data point text field, click on the push button "delete data point" and the selected data point is deleted.

Help

For more information about the function "read value on data point" please refer to the WinCC OA 3.11 online help by clicking on the push button "Help".

Apply

Click on the push button "Apply" and reading value on a data point is completed. The entered values are then applied to the current function.

Cancel

Click on the push button "Cancel" and this function is rejected. A new function can be then selected.

Figure: A new function to read value from data point added successfully