Using an FMU in a while iterator block

2020 8 27
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更新时间：2020 9 15
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Hello,
we try to use an FMU in w "while iterator" block. We import the FMU as model exchange but Simulink gives the following message: 'Validation/While Iterator Subsystem1/FMU' has sample time 0. Only constant (inf) or inherited (-1) sample times are allowed in iterator subsystem 'Validation/While Iterator Subsystem1'.
I thought the communication step size might be the problem. But this parameter cannot be changed in model exchange mode. I also thought that in model exchange mode there cannot be a problem with step size because the FMU gets the step size from the solver.
Thank your very much!

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Michael Sack
Michael Sack 2020-9-15

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I found a solution! I do not know what the problem is exactly. I think the Simulink FMU wrapper is not as powerful as other tools to implement FMU's. I found the following package: https://sourceforge.net/projects/matlab-fmu/. There are functions to implement FMU's in matlab code. It is then possible to execute an FMU in a loop. No error.
Thanks

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