Project Constants do not display the assigned Values on a Function Diagram.
Project Constants do not work if any Special Characters are used on Project Constant Names.
Procedure to configure Project Constants on a Function Diagram:
1> Create a Project Constant Folder "say cAlarms" at the Project highest level (Right Click Project and select Project Constant). Do not use Space or special Characters in the name.
2> Create at sublevel the Project Constant say "AlarmsLim1" of type dint. Do not use Space or special Characters in the name. Assign a number say 450.
3> On Function Diagram, Select the Function Block and right click and select Aspect property. Type the exact path say "cAlarms.AlarmsLim1" for the project constant.
4> Save the Function Diagram. Generate Data on FD.
5> Download and go online the application to the Controller.
6> On Function Diagram Select the port where Project constant is connected and select "Add to display list" from the Online Menu . Use subscribe for live data from Online Menu. The port should display "450" on that port.