If you use more than the number of connections Vector allows, you might get an error:
In MATLAB® R2013a and later:
Unable to query hardware information for the selected CAN channel object.
In MATLAB R2012b:
boost thread resource allocation error.
In MATLAB R2012a and earlier:
An unhandled error occurred with CAN device.
To work around this issue in Simulink®:
Use only a single Receive block for message reception in Simulink and connect all downstream Unpack blocks to it.
Use a Mux block to combine CAN messages from Unpack blocks transmitting at the same rate into a single Transmit block.
To work around this issue in MATLAB:
Try reusing channels you have already created for your application in MATLAB.