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

Question

Rahul 2026-2-16，6:21

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https://ww2.mathworks.cn/matlabcentral/answers/2182662-error-with-fixedstepdiscrete-solver-in-simscape-plant-model-during-code-generation-attempt

评论： Tridib 2026-2-20，8:47

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:

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)?
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?