In 20-sim you can easily create your own components. The process of creation consists of three parts:
| 1. | For any connection an internal port has to be defined. For each port you have to specify some data: |
| • | The physical domain. |
| • | The size. |
| • | The orientation. |
| • | The causality. |
| 2. | Create the icon for the component. This can be done with a specialized drawing editor. |
| 3. | Create the component description. This can be done by (differential) equations or by an iconic diagram. |


