In the image there is an example of how read Modbus using some of the different possibilities that FIN offers (missing 64 bits combinations to keep it simple).
There are 2 words (32bit) simulated with Simulink and, for each word, there is also the bit representation: so register 40001, contains a number that, read with the default data:"u2", is 24338; the same 40001 register’s bit representation is: 0101111100010010
Note: You can try it in your calculator set in “Programmer” mode.
Since each word (16bits) could be seen as a 8bit(1byte) + 8bit(1byte) = 16bit (2bytes or 1Word), we are using colors to emphasize each Byte group, so it should be clear how these bytes combination is read using different “data” value in FIN.