Some Constant blocks not tunable in Simulink External Mode

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.

[Mike Buba]

Hi, I have the same issue with the Simulink model in External run mode for Matlab 2018a. Were you able to find a solution? Some constants are tunable and some are not. And I just copy/paste blocks

[Thomas Marullo]

I don't recall, sorry.

[Mike Buba]

I noticed the not tunable constants were directly or indirectly, via subtract block (reference - feedback), connected to the PID Controller block.

When I implemented my PI block (similar to as it is under the PID Controller's mask), I could tune them.

Same is with Discrete-Time Integrator.

Answer 1

[Sebastian Castro]

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

[Thomas Marullo]

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]

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?