Observer Port error: Observer Port is mapped to an invalid block, because this block is inside a function-call subsystem.

Hello,

I'm testing the Simulink model at the component level by using Simulink test. I need to verify some internal signals. In this way I tried to use the Observer Reference Block and Observer Ports. I followed the steps from the link: Access Model Data Wirelessly by Using Observers - MATLAB & Simulink (mathworks.com).

I get the following error:

Observer Port is mapped to an invalid block, because this block is inside a function-call subsystem.

I was wondering if this is a tool limitation or is it somethig that I am doing wrong?

I appreciate a lot your support! Thank you very much!

Diana

[Animesh]

Hi @Diana

It would help if you could share the simulink model

[Diana]

Hi, thanks for your response!

Could you please give me a hint without checking the model? I am not allowed to share the models.

[Diana]

Hello, could you please support with a solution for this error?

Thanks much!

Answer 1

[Varun]

Hi Diana! As per the following documentation link (https://www.mathworks.com/help/sltest/ug/access-model-data-wirelessly-by-using-observers.html), the "Observer Port" block can observe the following signals:

• Continuous-time and Discrete-time signals
• Zero-order hold signals
• Scalar signals
• Wide signals
• Nonvirtual bus signals
• Messages
• Conditional subsystem signals
• Stateflow® local data parameters, except locals, parameters, signals, and other data defined in a Simulink subsystem inside a Stateflow state.
• Stateflow state self activity, except if that activity is in a Simulink subsystem inside a Stateflow state.

So, it appears that a function-call subsystem is probably not supported yet. But to achieve similar results, you can propagate and log the signal outside the function-call subsystem using a "Data store" block.

You can refer to the following documentation link to learn more: https://www.mathworks.com/help/simulink/ug/data-store-basics.html.

Hope this helps!