Constant Blocks Value Change under mask

Hello,

I developed a Simulink model with lots of inputs. The model is working perfectly, however I want to make it more useful. I masked my constant blocks (12 constant blocks) and I made sliding buttons, radio buttons etc. Now I cannot change the values of constant blocks. I can move sliders and dials but they are not effect the value. I promoted their constant values but still I cannot change it. Is there anyone can help me ?

Kind regards,

Ege

[Sanman]

Hi Ege,

Would you mind sharing your model?

Regards,

Sanman

[Ege Can Koçak]

Hello Sanman,

Unfortunately I cannot share the model but I can briefly explain it to you. Actually it is a simple change in the model;

I have lots of constant blocks to give the model input values. I masked them together in order to make it more user friendly. I add some sliders, dials etc. to give input values before start the model. Now the sliders and dials does not change the value of the constant blocks.

Should I use any alternative for constant blocks or what can I do to change constant block's values with mask ?

Best regards,

Ege

Answer 1

[Tejas]

Hello Ege,

To modify the values of Constant blocks through a mask, you should begin by defining parameters that correspond to each block within the Mask Editor.

After setting up these parameters, you'll need to create a mask initialization callback. Within this callback, you can employ the 'set_param’ function to update the values of the Constant blocks to your desired figures.

Here is a screenshot for your reference, showcasing the corresponding parameters for the constant block.

In the code section of Mask editor, create a Mask Initialization callback , and enter the following code :

function MaskInitialization(maskInitContext) 

            set_param( [gcb '/Constant_1'],  'Value',  'Val_const1'); 

            set_param( [gcb '/Constant_2'],  'Value',  'Val_const2'); 

            set_param( [gcb '/Constant_3'],  'Value',  'Val_const3'); 

        end 

Here “Constant_1”, “Constant_2”, “Constant_3” are the labels assigned to constant blocks in Simulink model.

This solution is tested on MATLAB R2023b. For more information about 'set_param' function please refer to this documentation : https://www.mathworks.com/help/simulink/slref/common-block-parameters.html#:~:text=Simulink.VariantConfigurationData%20object.-,Examples%20of%20Setting%20Block%20Properties,%27mymodel/Gain%27%2C%27Position%27%2C%5B50%20250%20125%20275%5D),-See%20Also .

Hope this helps!