Hi,
If you are running your code embedded in the FP controller your custom tags will not work if you don't have a front pannel open for the VI.
For example, imagine that you have developed a code with Custom Tags and it runs fine in the Host PC (Win) and even if you target the Labview in the FP controller the code will run, as long as you have the Front Panel VI open, if you close the front panel the embedded code will not work. The reason being is that FP custom VI's use property node in the code and these property node read value from the front panel memory space, which in RT does not exist.
The general recomendation is not to use Custom tag in any labview code that you might want to run embedded.
Best Regards
Andre Oliveira
Applications Enginee
r
National Instruments
