Why do I get the error: "Cannot change parameter while simulation is running" when running my Simulink model in "Monitor and Tune" mode on external hardware?
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I cannot change any of my model parameters when I run my Simulink model in External Mode ("Monitor and Tune") with supported hardware, like TI C2000 or STM32 boards. When I try to change a parameter on my Simulink model, I face this error:
"Cannot change parameter 'Constant value: (Value)' of 'ePWM_LED/Constant' while simulation is running".
What can I do to be able to tune parameters without stopping the simulation?
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MathWorks Support Team
2025-8-19
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The “Default Parameter Behavior” is currently set to "Inlined" in the model configuration, whereas it needs to be set to “Tunable” to change parameter values during run-time. You can find this setting by referring to "Configuration Parameters" -> "Code Generation" -> "Optimization" -> "Default parameter behavior". Please see the image below.
With the setting configured to:
- “Inlined”: The values cannot be changed during run-time. This setting generates optimized code wherein the values of the corresponding blocks parameters are inlined to reduce RAM usage.
- “Tunable”: The values can be changed during run-time. This setting generates code with the values of the corresponding block parameters set as tunable fields of a global parameters structure.
For more info on the setting, please refer to the doc page:
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2025-8-19
2025-8-19
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