Hello,
When you translate your simulink model to DLLs Labview generates a directory with a bunch of VIs and in a subdirectory the DLL.
If you use an RT target you have to download the DLL on the target before trying to execute your code.
Here are the steps :
Simulink translation to Labview DLL
Copy of the DLL in a directory on the RT target (with FTP)
Start Labview with RT target
Start your application : Labview will then download all the VIs but not the DLL (unless there is an option I dont know about).
If It does not work check for the path (Path sent to SIT initialize model) of the DLL on the target.
Hope it helped as I did the same mistake the first time.
Bye,