Some Constant blocks not tunable in Simulink External Mode
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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.
3 Comments
Mike Buba
on 24 Oct 2021
I noticed the not tunable constants were directly or indirectly, via subtract block (reference - feedback), connected to the PID Controller block.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/776718/image.png)
When I implemented my PI block (similar to as it is under the PID Controller's mask), I could tune them.
Answers (1)
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?)
- Sebastian
2 Comments
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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