Simulink + QUARC: Simulation Stops at T = 0.210s Despite Stop Time Being Set to inf

Question

Atharva 2025-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/2176558-simulink-quarc-simulation-stops-at-t-0-210s-despite-stop-time-being-set-to-inf

回答： Adit 2025-8-6

Hi all,

I'm working with Simulink R2017 and QUARC 2.6.2082.0 to control a Quanser Coupled Tank System using the Q2-USB DAQ. The model runs in External Mode and includes the required HIL Initialize and HIL Write Analog blocks.

Setup:

Target: Q2-USB via QUARC
Stop Time: inf
Solver: ode3, Fixed-step, step size 0.001
Scope shows: T = 0.210s, then simulation ends
Model Build: Successful
HIL block settings: Analog Output in range [-10V, 10V]
Diagnostic Viewer shows: "Simulation elapsed: 2 sec", but simulation stops at T = 0.210 on the scope
No errors are shown in MATLAB or Diagnostic Viewer

What I've Tried:

Set Stop Time to 1000 instead of inf
Changed solver and step size

Problem:

Simulation starts correctly, the motor runs briefly, but it always stops at T = 0.210s, even though Stop Time is much larger. The model becomes disconnected from the target, and the Run button becomes grayed out.

Any help or suggestions would be really appreciated!

Thanks in advance!

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Answer 1

Adit 2025-8-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2176558-simulink-quarc-simulation-stops-at-t-0-210s-despite-stop-time-being-set-to-inf#answer_1568856

Hi Atharva,

Here are some possible workarounds you can try to resolve the issue of your simulation stopping prematurely:

Disable or increase the Watchdog timeout in the HIL Initialize block.
Increase the simulation step size to reduce CPU load (for example, try using a step size of 0.002 or 0.005).
Remove any Stop Simulation blocks or logic that may be halting the simulation.
Increase the target communication timeout in the QUARC Target Console.

These steps should help resolve the issue. For further information, refer to below links:

https://docs.quanser.com/quarc/documentation/q2_usb.html

https://www.quanser.com/products/quarc-real-time-control-software/

https://docs.quanser.com/quarc/documentation/hil_initialize_block.html