Unable to set gain control as a variable in Simulink, setting a numeric value works OK.

Simulink Version 9.3 (R2019a)

I'm unable to set the Gain control as a variable. The entire Gain block turns red with an exclamation mark.

Setting the Gain as a numeric value works OK.

Thank you.

Answer 1

[Paul]

It turns red with the exclamation mark because you haven't defined the variable in any workspace that the model can see (typically the base or model workspace) and/or you haven't updated the model since the variable was defined. For example, if the parameter in the Gain block is 'mygain' then define it with a value in the base workspace

>> mygain = 1;

Then update the diagram.