2.11.3.5 Displaying and changing I/O register contents during program execution

Select an I/O register that is the subject you want to display or change and register it as a watch-expression on Watch panel. That way, you can display or change the value of any I/O register in real time even while the program is running, not just when the program is halted.

For details about watch-expressions, see Section "2.11.6 Displaying and changing watch-expressions".