How can i maintain different variable(global) for multiple instances of same block.

I have generated a library.

Integrated external c function using s-function builder.

Different instances of the custom block operates on a single global variable. My requirement needs to maintain separate global variable for multiple instances.

How can i get that to work?

Using R2020b

Answer 1

[Rishav]

Hi Anamika,

You can use Simulink's S-Function API to manage instance-specific data. Please follow the below mentioned steps to achieve the same:

1. Define a structure to hold the instance-specific data for each block instance. This structure will include the global variable and any other relevant information.
2. Use the S-Function's 'mdlInitializeSizes' function to allocate memory for the instance-specific data structure for each block instance.
3. Use the S-Function's 'mdlOutputs' or 'mdlUpdate' functions to access and manipulate the instance-specific data as needed.

You can also refer to the below mentioned documentations on:

1. mdlInitializeSizes - https://www.mathworks.com/help/releases/R2020b/simulink/sfg/mdlinitializesizes.html
2. mdlOutputs - https://www.mathworks.com/help/releases/R2020b/simulink/sfg/mdloutputs.html
3. mdlTerminate - https://www.mathworks.com/help/releases/R2020b/simulink/sfg/mdlterminate.html