SrcData

Engineering

1. Add a combo box to the interface.
2. Change the drop-down list for the 'Src Data' attribute of the 'Data' category using the 'Combobox Src Data' dialog
3. 1. Define the required number of entries and their sequence.
4. 2. For each of the three entries, assign an ID, a text that is displayed in the drop-down list and the value behind this entry.

Additional Information

A simple list of options can be compiled in the Engineering. Each option consists of these components:

• ID: Custom ID
• Text: Display text
• Value: Value that can be passed on later within the application.
• Category (version 1.12.744): An optional category of the value, which is displayed in the drop-down of the control.

Further, complex data are supported by using Binding for this parameter.

• Arrays can be used directly. In this way, a string array or number array can also be linked.
• Objects are supported as a key-value list. The name of the property is interpreted as display text, the value is interpreted as a value.

The categories (and the display text independent of the value) can be used to easily group the values.

Category A
    Option 1 => valueA1
    Option 2 => valueA2
Category B
    Option 1 => valueB1
    Option 2 => valueB2

Category: General

PLC

Array of a structure representing the structure of a list entry

The structure elements must be named identically to the attributes defined on the TwinCAT HMI side. Upper and lower case is taken into account.

aComboboxEntries : ARRAY [1..5] OF ST_ComboboxEntry;
TYPE ST_ComboboxEntry:
STRUCT
    id : INT;
    text : STRING;
    value : INT;
END_STRUCT
END_TYPE

Array of a simple data type

aTexts : ARRAY [1..5] OF STRING;
aValues : ARRAY [1..5] OF INT;

1. Add a combo box to the interface.
2. Link the array to the 'Src Data' attribute of the 'Data' category