...
In order to output, display, or monitor data, connections must be made between points in the model and the connectable points instantiated from the digital bi-directional slot configuration.
To create a connection , the user drags and drops the connectable items onto an appropriate OpOutput or OpInput block in the Configuration panel of the RT-LAB projectto the appropriate OpInput or OpOutput block, use the Dashboards interface, accessible from the project, and refer to its documentation.
Direction
The direction can be either set as input or output. This field can be read-only based on the bitstream configuration.
...