ASB Quaternion to rotation angles block creating input data dependency

I wanted to do an experiment for a pitch angle controller, and as a shortcut/oversimplification I want to pull pitch angle directly from the simscape 6-DOF joint connecting my vehicle to the world frame. The above schematic causes an input data dependency error. Removing the QtRA block removed the error but I don't understand what the issue is.

From reading, this error comes from requesting a value before it is available, so I thought it might be resolved by initializing the 6-DOF rotation angles by specifying a position state target (of 0) for the spherical primitive that doesn't seem to anything helpful here.

[cdlapoin]

is it possible that q being the name of the input for the Quat2RA block and also the input position for the simscape Revolute Joints is the issue? Can either of those be changed? I would try as a troubleshooting step but cannot find a way?

Answer 1

[Steve Miller]

I made a simple version of your model and it seemed to work fine. The Simulink model is attached and a screenshot is below. I suspect the issue has to do with a model parameter that isn't defined.

--Steve