In UniDDE, if you right click on your open project or use the menu buttons, you can copy the Read Command, Stop PLC Macro, Run PLC Macro, and Run/Stop Toggle macro. If I have the read command in an Excel worksheet, it tries to start UniDDE.exe but fails. Instead, I had to clear the field until the workbook is open then add the read command =UniDDE|Items!'lblDDE(1)' to the cell afterwards.
My second issue (the first being that I can't seem to get the UniDDE read command to automatically load the software) is that the PLC is not in Run mode. Therefore, I try to use the code that UniDDE