Normally, domain data is only read when the domain display is initiated or when you click on the Read from PLC or Write to PLC buttons.
To have data updated automatically:
Click on the File menu.
Select Live Update from the submenu.
Result: When Live Update is enabled, the domain values are read and updated automatically approximately every 3 seconds.
To return to manual mode:
Click the File menu. Note that Live Update has a check mark next to it.
Select Live Update again to turn off the Live Update mode.