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Some Constant blocks not tunable in Simulink External Mode

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Thomas Marullo
Thomas Marullo on 14 May 2015
Commented: Sebastian Castro on 14 May 2015
I'm running 2014a and I am using a Simulink model in External run mode. I have a few constant blocks I'd like to change the value of however they aren't all tunable during run time. For instance, Constant1 and Constant2 are connected to a Subsystem and Constant1's block properties are greyed out during runtime however Constant2's block properties I can change during runtime. They are virtually identically blocks wrt properties. Not sure what's going on here.

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Answers (1)

Sebastian Castro
Sebastian Castro on 14 May 2015
Are those constant blocks using hard-coded numerical values or are they variables (either numeric or Simulink.Parameter objects?)
Also, without knowing much about your model, I would maybe check your Inline Parameters settings?
- Sebastian

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Thomas Marullo
Thomas Marullo on 14 May 2015
Thanks, Sebastian. I've checked the Inline Parameters, which I've never turned on. My model is a closed loop system. The constant blocks use scalar/double variables as the value for the Constant block.
I've attached a screenshot of the model in external mode. I highlighted the block property of two constant blocks. The EQSCaleFactor one is a scalar/double value, (ie. 0.923). The Structure.P0 is a vector double 1x134. Structure.P0 is tunable whereas Integrator.EQScaleFactor isn't. I can't understand why.
Again, no Inline Parameters setting have ever been enabled.
Sebastian Castro
Sebastian Castro on 14 May 2015
Strange... so both "Structure" and "Integrator" are MATLAB structures, then?
Which of those blocks in your screenshot are the constant blocks in question, and what do they feed into?

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