| Subsystem | Prefix | Description |
| Master | SM_ | It is a main component in any RT-LAB model. It can’t be accessed after starting the simulation. Hence, there is no ability to change parameters inside this subsystem except the one in the console subsystem. |
| Slave | SS_ | It is an optional component in the RT-LAB model. It can’t be accessed after starting the simulation. It mainly used to divide the model into multi-cores. |
| Console | SC_ | It is the one that can be accessed during simulation time. It contains all the scope blocks and other variables that need to be modified during simulation time. |