Signals with Fixed-Point data types in Simulink Real-Time

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CescaCP
CescaCP 2023-9-26
回答： Dimitri MANKOV 2023-9-28
I have a Simulink Real Time model being excecuted in a target machine. The model contains a signal with fixed-point data type. When my signal, originally an integer, is converted to fixed-point type (with the Data type conversion block) it turns to 0.
I've marked the it for data logging and I also connected it to File Log block (as suggested in the link below). Either ways show the signal is 0.
https://fr.mathworks.com/help/slrealtime/ug/how-can-i-log_signal_data_from_nv_bus_fixed_pt_num_dim_signals.html?searchHighlight=fixdt%20in%20real%20time%20simulink&s_tid=srchtitle_support_results_1_fixdt%2520in%2520real%2520time%2520simulink
The same model works correctly in full simulation (simulink model, no real time).
Is there something I'm missing ? How can I solve this issue?
Thanks !

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回答（1 个）

Dimitri MANKOV
Dimitri MANKOV 2023-9-28
Hi Francesca,
Which MATLAB release are you using? The documentation you are referencing applies to R2023b, but I see that you entered R2018b in the details of your question. There has been a major update in Simulink Real-Time between R2020a and R2020b, which may explain the difference in the observed behavior.
Dimitri

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