S-function builder with fast restart

Markus Boxhammer

2021 12 14

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Hello,

I am using the s-function builder block in my Simulink model which works fine. When I want to activate the fast restart feature, I get the following error:

Warning: Fast Restart mode cannot be enabled for model xxx for the following reasons:

xxx

Warning: Fast Restart mode relies on the ability to save the model's operating point. However, the following error occurred

when an attempt was made to save the operating point:

xxx

Warning: Simulink is unable to access the simulation state because the C Level-2 S-Function (xxx) block

'xxx' does not allow access to its simulation state

Is there a way to fix this and define the ModelOperatingPoint or allow access to simulation state for my s-function builder block?

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Scott Tatum 2025-2-28

@Markus Boxhammer

I have come accross the same error, wondering if you ever found an anser?

Reid Spence 2025-5-1

For an S-function to support Fast Restart, it must support Operating Point. Think of Fast Restart as restoring an Operating Point at time = 0. Because S-functions allow you to do most anything you want, it can be difficult for Simulink to infer how it should handle restarting with Operating Point. Refer to the following doc page for details on how to set operating point compliance based on how your S-function operates.

ssSetOperatingPointCompliance - Specify how the software handles S-function operating point information when saving and restoring model operating point - MATLAB

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