I think there are plenty of ways to handle errors with Labview RT on a Fieldpoint controller.
Usually I use the general error handler vi to catch the error and get the error message (sure, no dialog), then write the eroor message into a log file (ordinary text file created on the controller), and/or send the eroor message through TCP/IP network to the host. You can use FTP to open, read and tranfer the log file at host. Hope help.
Xu