An instance of this type provides a drop-down list (a JComboBox) consisting of the elements of an enumerated data type as defined in IEC 61131-3. The data type name of the enumerated data type is specified by the TYPE input, and the initial value displayed is the specified initial value for the data type.

When an element is selected from the drop-down list, an IND event occurs with the enumerated value of the OUT output corresponding to the selected element from the drop-down list.

The interactions between the application and the JComboBox are represented by the service sequences shown below.