Wulf,
Error 32804, Invalid IA handle, normally occurs when you pass an Invalid FieldPoint Refnum into any of the FieldPoint Read/Write/Advise/Create vi's. This indicates that the handle to the server is invalid. This is most frequently seen when an FP Close.vi was executed but other code is still running. In your case though, since you are using globals, I suspect that what may be happening is either of two things. The first is that you are running one VI that has the FP Open.vi and it is passing the refnum to the global and then stopping. In this case since the VI that called the FP Open is no longer executing, the server closes automatically. The second possibility is that you are reading the global refnums before you are writing to them with the FP Open
and FP Create Tag.vi's.
Regards,
Aaron
LabVIEW Champion, CLA, CPI
