How can i set the Simulink lookup table output limit

i want to get data from 1-D Lookup table in simulink with includeing extrapolation method and only plus side.

but i don't know how can this.

Ex)

1) LUT Data

X : [0.7, 0.8, 0.9, 1, 1.1]

V : 1.5, 1.4, 1.3, 1.2, 1.1]

2) Data INPUT and result (Current)

2-1) INPUT : 1 --> OUTPUT : 1.3

2-2) INPUT : 16 --> OUTPUT : -~~~ (Extrapolation method)

if Extrapolation method result is lessthen zero, I want to get result 0.

2-3) INPUT : 0.2 --> OUTPUT ; +~~~(Extrapolation method)

i was tryied Data Types - Output Minimum and Maximum Seting but that is not working. (Using verstion is 2015b)

Please letme know this solution.

[Nithin]

Have you tried setting the "Table Data Maximum" and "Table Data Minimum" parameters? You can refer to the link below for more details regarding these parameters - https://in.mathworks.com/help/simulink/slref/1dlookuptable.html#d124e145820

[환곤]

Hi i have tried the parameter but can't work these parameters.

[Nithin]

What problem are you exactly facing with the parameters? Are you receiving any error messages?

[환곤]

I tried setting "Table Data Maximun" and "Table Data Minimum" parameters.

Like below picture

And goto some values in Lookuptable, dosen't working "Maximum","Minimum" parameter.

LUT is working and nothing error. but can't applying parameters.

Answer 1

[Nehemiae]

Hello,

The Output Minimum and Maximum properties in the 1-D lookup table, are the information stored for further optimizations done, such as:

• Parameter range checking.
• Simulation range checking.
• Automatic scaling of fixed-point data types.
• Optimization of the code generated from the model.

It does not limit the output of the lookup table as such, and hence a saturation block with upper limit being inf and the lower limit being 0, can be used.

The documentation on 1-D lookup tables (https://www.mathworks.com/help//releases/R2021a/simulink/slref/1dlookuptable.html), specifically the section under “Output Minimum – Minimum value the block can output”, can be explored to understand the underlying optimisations where this property is used.