# Internal I/O

The controller has two screw terminals located on the inside. They can be used to connect digital input and output signals.

All the digital input signals and the digital output signals that are listed in the Reference section can be routed to the internal I/O terminals.

For electrical specification and connections, see the controller documentation.

How to assign an accessory configuration to a Virtual Station is described in the Virtual Station section.

Relevant Information

- Adding an accessory to a Virtual Station
- Unassigning an Accessory from a Virtual Station