How to trigger function call at a user defined periodic rate when using the "Show enable port" option in a Function-Call Generator

Attached is a simulink model that represents the functionality that I am trying to end up with. At this point I can get everthing to work as intended except for having my functionA and functionB run at different periodic rates when using the "Show enable port" option in the Function-Call Generators.

How can I get these two subsystems to run at different user defined periodic rates using function calls? Specifically, I want to be able to run FunctionA at 0.2 sec timesteps, and Function B at 0.5 sec timesteps. Currently both systems are running at the base simulation rate of 0.1 seconds.

I tried creating a stateflow graph (commented out) with output events that would trigger the functions at different rates, however each function ends up getting reset inbetween function calls. I only want them to be reset when the resettable subsystem is triggered by the enable logic at the root level.

Another solution I had tried instead of function calls was using enabled & triggered subsystems with a square wave generator, but this introduces other issues that would also need to be resolved.

Answer 1

[Adit Kirtani]

Hi Andrew,

From what I understand, you wish to modify the sample rate at which the function call subsystem “checks” if there is a function call or not.

In that case, I would recommend the rate transition block. Simply connect it between your enable signal and the function call generator as such:

The rate transition block can be set to operate at a multiple of the input signal’s sample rate. In your case, you can set it to multiples of 2 and 5 respectively. Here’s a link to the documentation of the rate transition block, it should help your model operate as intended:

https://www.mathworks.com/help/simulink/slref/ratetransition.html

I hope this helps,

Adit Kirtani.

[Andrew Frank]

Adit, thanks this is what I was looking for and solves my issue.