Simulink , data store memory, different value of reading/writing
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JACK DENG
le 17 Avr 2021
Commenté : JACK DENG
le 21 Avr 2021
hi, all
Currently I meet one question.
i have an parameter: tmptr is constant, 25degC.
as this two picture, picture1 is in sub-system#1, picture2 is in sub-system#2.
- data store writing is ok, all time tmptr is 25.
- data store reading is some wrong, after reading, temp is 0degC in begining.
Also I have tried do writing/ reading in same sub-system, value is right,
why is it? look forward your answer, thanks.
picture1
picture2
Regards
Jack
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Aghamarsh Varanasi
le 20 Avr 2021
Hi Jack,
I see that there is a small time gap before the Data-Store Read block 'reads' the data from the data store memory. This is because there might be a Read operation from the DataStore Read block, before the Write operation from the DataStore Write block.
To check if this is the issue in your model,
1. You can turn the parameter 'Detect Read before Right' in the Model Configuration Parameters > Diagnostics > Data Validity > Data Store Memory block pane, to 'error' out. This configuration is set to 'warning' by default.
2. You can see the order in which the blocks are executed using the Execution Order under Information Overlay in the Debug tab in Simulink toolstrip.
To overcome this issue, some of the workarounds are:
Hope this helps.
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