Programmatically change user defined Library objects in Simulink model

Question

Gert Persson 2021-5-27

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评论： Fangjun Jiang 2021-5-27

Dear Sirs,

I have made a plain Simulink model consisting of Current Sensor/Scope/Switch etc. There are also two subsystems (Load and Battery) that are user defined Library objects. Links looks fine. The model works and simulation results are correct.

Now I want to programmatically (from Matlab command window) change the Library objects. Say from Load_RLC to Load_R. Both exists as Library objects. I have tried commandos like:

open_system('LowVoltageSystem')

add_block('Load_R','LowVoltageSystem')

pos=get_param('Load_RLC/LowVoltageSystem,'position')

delete_block('Load_RLC/LowVoltageSystem’)

set_param('Load_R','position',pos)

But the ‘Load_R’ can not be found (There is no block named 'Load_R')

I have also tried things like:

replace_block('LowVoltageSystem,'Load_RLC','Load_R')

Here the ‘Load_R’ is invalid block type.(Invalid NewBlock (<Load_R>) passed to REPLACE_BLOCK. Try built-in/BLOCKTYPE or a valid block name.)

The replace_block command, however, works with the built-in library blocks.

If I change the library components ‘manually’ everythings works, so there is nothing wrong with the components themselves.

What am I doing wrong here?

Best//Gert

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Answer 1

Fangjun Jiang 2021-5-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/841135-programmatically-change-user-defined-library-objects-in-simulink-model#answer_710560

编辑：Fangjun Jiang 2021-5-27

In the first part of your code, add_block() is not used properly. You need to specify the full path of both the source and destination blocks. Look at examples in "doc add_block".

replace_block() is the ideal function to use for your task. Again, you need to specify the full path of the source and desination blocks, e.g. 'CustomLibraryFile/LibraryBlock', 'ModelFile/ModelSystem/BlockName'. For custom library, you also need to open the library first using open_system() or load_system()

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Gert Persson 2021-5-27

You are perfectly right!

I will make the model more clear by renaming the load in 'LowVoltagesystem' to 'Load'. I will also put the load in a library 'Load_Lib'. The command must then become:

replace_block('LowVoltageSystem','Name','Load', 'Load_Lib/Load_R')

Following the LibraryLink of the Load in the Simulink model 'LowVoltagesystem' then shows what Load is active.

If I remember right there was also an option for closing the "Replace Dialog" that appears. Nice things todo tomorrow :-)

Thanks a lot for your professional help!