- The red dash mean you cannot connect the two blocks together. I assume that would be due to the wrong connections between blocks made or extra connections done, or it might be connected to only one block.
- https://www.mathworks.com/matlabcentral/answers/35345-inductor-resistor-and-capacitor
- https://www.mathworks.com/matlabcentral/answers/518362-red-dotted-line-in-simulink#:~:text=The%20red%20dash%20mean%20you,connected%20to%20only%20one%20block.
- https://www.mathworks.com/matlabcentral/answers/501390-red-dotted-line-problem-in-simulink