The values of desired_speed and desired_trq are 1 & 99, the typedef is PERCENTAGE which of integer type,but while simulating it is showing fraction values, Is this something to do with the "PERCENTAGE " typedef ?

typdef definition of PERCENTAGE in .m :

PERCENTAGE.WordType = 'uint16';

PERCENTAGE.DataTypeMode = 'Fixed-point: slope and bias scaling';

PERCENTAGE.Signed = 0;

PERCENTAGE.WordLength = 16;

PERCENTAGE.ScalingMethod = 'gain/offset';

PERCENTAGE.Gain = 2^15/100;

PERCENTAGE.DisplayMin = 0;

PERCENTAGE.DisplayMax = 199.9;

PERCENTAGE.DisplayPrecision = 8;

PERCENTAGE.Description = 'This is the percentage datatype';

PERCENTAGE.DisplayUnits = 'percent';

Answer 1

[Mark McBroom]

You have specified PERCENTABE to used fixed point data type. Simulink is showing you the floating point equivalent of the integer value after applying the specified slope and bias scaling.

[Manjunath Bhimalli]

Thank you for the response.

Can you please specify how to overcome this without altering the datatype mode?

Also, is it something to do with the scaling method?

[Mark McBroom]

Not sure what you are trying to overcome. If you want to retain the specified fixed point settings, the Simulink will always show you the physical signal value. Are you trying to see what the integer equivalent is to the fixed point number? If so, you could connect the signal to a display block and then set the "Format" for the display block to "decimal (Stored Integer)"

[Manjunath Bhimalli]

I am expecting integer 1 as 1.00000000 in fraction not as 1.0009765625 with the same 'DataTypeMode = Fixed-point: slope and bias scaling' is that possible?

[Mark McBroom]

With the gain you have selected, it is not possible to represent 1.000000

The LSB of the integer representation is bit = (1/2^15) * 100

327* bit = .9979

328*bit = 1.0010

You will need to select a different scale factor if you need to represent exactly 1.0000000