Logical Blocks - Controller Block Updating ManipulatedVariable with PythonNet

[elliotfekete]

Hi Daniel,

First of all, thanks for so much writing DWSIM - it's a genuine god send at work.

I'm writing a script using the PythonNet interpreter in the Script Manager to simulate a dynamic problem. In this simulation I've found that using fsolve in scipy.optimize really struggles under some conditions since the dependent variable can become extremely sensitive.

I find that the flowsheet solver is more reliable, so I've added a controller block to replace fsolve. However, I need to dynamically change the Manipulated Variable between Pressure and Mass Flow in my code to make this work.

Currently, I have the following code that is supposed to update the Manipulated Variable to Mass Flow. When I run and print controller.ManipulatedVariable, it has been updated with the value "Mass Flow", but the controller block does not update. I know that controller.ManipulatedVariable is being updated, since it prints "Mass Flow" when I print it. It seems like it isn't being fed to the Controller Block input. I also have the same issue when trying to set other properties of the Controller Block.

Do you know what I am missing here?

Thanks in advance!
Cheers,
Elliot.