I/O device selection
After right-clicking on "Devices" and selecting "Add New Item…", a selection dialog for the specific I/O devices appears. Various fieldbus cards, specific Beckhoff hardware, diverse PC interfaces, etc. are available for selection there.
The fieldbus systems Profibus and DeviceNet support an I/O configuration via supplied description files or configuration files supplied by the respective manufacturer.

In the tree view of the selection dialog all I/O devices in question are offered. Straight EtherCAT capable Ethernet ports are expanded.
Type
Offers a listing of the fieldbus protocols and associated I/O devices (fieldbus cards) supported by TwinCAT.
Name
The identifier for the device selected in the tree view can be edited according to your own ideas.
Target system
Provides a selection filter for limiting the display in the tree view to only those I/O devices that are also supported by the currently available Beckhoff target platform. In the default setting, all I/O devices are displayed.
OK
Confirms the I/O device selection and closes the dialogue. Alternatively, a double-click on the item selected in the tree view can be used.
Cancel
Closes the dialog without taking over a possibly selected I/O device in the tree view into the current configuration.