Hi Laios,
first of all, let's see if I've correctly understood. For managing arrays from LabVIEW to a Simulink model, try to use the example updatingindicators.vi located under C:\Program Files\National Instruments\LabVIEW x.x\examples\Simulation Interface\Updating Indicators. It just read the value from some controls on the block diagram and updates a very simple Simulink model (included into the same folder). Since one of the controls is an array, it may help you.
Let me know if you need more help,
Best regards,
Fabio
Fabio M.
NI
Principal Engineer