Error with FixedStepDiscrete Solver in Simscape Plant Model During Code Generation Attempt

I'm working on generating C/C++ code from a Simulink plant model that uses Simscape blocks, specifically for an EV plant model project. As a starting point, I've created a minimal test model ('Test') containing just a single Simscape block (e.g., a basic electrical or mechanical component) with no other blocks or connections.

When I try to build the model for code generation (using ert.tlc or similar), it automatically selects the "FixedStepDiscrete" solver and fails with this error:

text

Error: The "FixedStepDiscrete" solver cannot be used to simulate block diagram 'Test' because it contains continuous states.

I understand this happens because Simscape blocks introduce continuous states, which require a continuous or fixed-step continuous solver (like ode4 or auto-detected fixed-step). However, for code generation with Simulink Coder, documentation indicates fixed-step solvers are often required, and purely discrete solvers don't support continuous states​

My questions:

1. Is code generation possible from a plant model with Simscape blocks? If yes, what solver configuration works (e.g., fixed-step continuous solver with specific settings)?
2. For a simple model with one block, how do I configure the solver and model settings to enable successful code generation? Should I add a Solver Configuration block or use a local solver?

[Tridib]

Hi @Rahul,

Please refer to the following documentations which should assist you in resolving your doubts:

https://www.mathworks.com/help/simscape/ug/limitations.html

https://www.mathworks.com/help/simscape/ug/how-simscape-code-generation-differs-from-simulink.html

https://www.mathworks.com/help/simscape/ug/about-code-generation-from-simscape-models.html

Hope this helps!