running a simulink desktop real-time model as .m file

Hello everyone,

So i have made a controller as a simulink model and im trying to run it from matlab editor. The simulink model runs in simulink desktop real-time, and it's output is connected to a hardware and the input is connected back to the software.

The problem is that when i run the simulation from simulink, the controller works fine and it does it's job, but when i run it from matlab editor, it goes crazy. The controlled variable keeps rising and the controller does not work.

Im using the following code to run the simulation:-

clc

clear all

x=0.004

simout = sim('PI_Controller.slx');

Im guessing the problem is with sim command. Maybe there is a different command for running a simulation that runs in ream-time?

Im attachment is a Photo of my Model.

What am i missing here?

Regards

Ali

Answer 1

[Altaïr]

Hey @Ali Albaidhani,

While more details about the model would help pinpoint the issue, here is a useful documentation page that offers general guidance on running an application from the MATLAB command line:

web(fullfile(docroot, 'sldrt/ug/run-application-from-matlab-command-line.html'))

Note: Run the command in MATLAB command window to open the doc page.

There are three simulation modes mentioned in the documentation:

1. For a moderate sample rate, up to 1 kHz, Connected IO mode or accelerator mode is recommended. In these modes, the Simulink model runs within MATLAB, while only the I/O module drivers operate in the Simulink Desktop Real-Time kernel.
2. For a higher sample rate, up to 20 kHz, Run in Kernel mode is suggested. This mode uses Simulink Coder to generate a real-time application from the model, with both the real-time application and the I/O module drivers running in the Simulink Desktop Real-Time kernel.

Additionally, a Real-Time Controller example can be found here:

web(fullfile(docroot, 'sldrt/ug/real-time-controller.html'))

Kernel Mode simulation might be suitable for the use case. For more information on preparing a model for Kernel Mode simulation, refer to:

web(fullfile(docroot, 'sldrt/ug/simulink-run-in-kernel-mode.html'))

Providing more information about the model or a dummy model would be helpful for further assistance.