Object Global Variable List
Symbol:
A global variable list is used for declaring, editing and displaying global variables. If you add a GVL to the project, the variables apply to the whole project.
Object Creating a global variable list
- 1. Select the folder GVLs in the Solution Explorer in the PLC project tree.
- 2. In the context menu select the command Add > Global Variable List.
- 3. Enter a name and click Open.
- TwinCAT adds the GVL to the PLC project tree and opens it in the editor. You can define the global variables between the keywords VAR_GLOBAL and END_VAR.
Defining global variables
- A GVL is open in the editor.
- 1. Enter the variable declarations in the correct syntax, or select the Auto Declare command in the Edit menu or in the context menu of the editor.
- The Auto Declare dialog opens. The entry VAR_GLOBAL is selected in the Scope selection list.
- 2. In the Name field enter a name for the global variable.
- 3. Select a data type in the Type selection list.
- 4. If a variable is to have an initialization value that differs from the standard initialization value, click on next to the initialization value field.
- The Initialization Value dialog opens.
- 5. Double-click on the Initialization cell of your variable and enter the required valid value.
- 6. Click on OK.
- The initialization value is shown in the Auto Declare dialog.
- 7. Activate one of the flags, if required.
- 8. Confirm your inputs by clicking OK.
- TwinCAT adds the declared variable in the GVL. The global variable is available in the whole PLC project.
See also:
- TC3 User Interface documentation: Command Auto Declare