Why simulink simulation stop takes so long?

I'm developing a Simulink Model that communicates with a Beckhoff PLC for SIL simulation.

To interface the PLC I'm currently use the Beckhoff package developed for Simulink, TE1410 (TE1410 | TwinCAT 3 Interface for MATLAB®/Simulink® | Beckhoff Worldwide). In partciluar, I'm using the "TC Symbol Interface" block. To manage the sample time of the Simulink simulation, it includes the "Real-Time Synconization" block.

The simulation starts and runs very well. No issues. The problem arises when I want to stop it.

The simulation stop takes at least 5 minutes but often I had to terminate matlab from the task manager.

Any advise? Some point that I'm missing?

I already started a thread with Beckhoff support service for additional information.

Answer 1

[UDAYA PEDDIRAJU]

Hi Val,

I understand the problem, the delay in stopping the Simulink simulation could be due to the complexity of your model, the communication with the “PLC”, or the real-time synchronization settings. Here are some suggestions which could help in reducing the time taken during simulation:

1. Optimize Your Model: If your model is complex, try simplifying it or optimizing the calculations and data exchanges.
2. Check Your “PLC” Communication: Ensure that the communication between Simulink and your “Beckhoff PLC” is functioning optimally.
3. Adjust Real-Time Synchronization Settings: Try tweaking the settings of your “Real-Time Synchronization” block.

additionally you can look at: Simulation stop time - MATLAB - MathWorks India

Best,

Uday

[VaL V6]

Hello Uday,

thank you for your answer.

I definetly find out that the problem is introduced by the Beckhoff communication blocks. In fact, if I comment out these blocks, I run an internal simulation and control the simulator by using the Simulink dashboard, the stop is instantaneous.

I'm wainting for feedback from Beckhoff. If some news will come out, I'll give an update to the community.

Best,

Valerio