Beckhoff CU2508 Documentation page 44

Commissioning
Fig. 56: Selection of the adapter for EAP
If not all devices are offered, the target platform can be selected via TargetType.
Not an actual port of the PC, but rather a virtual adapter of the CU2508 is then merely selected as the
Ethernet adapter for the CU2508.
Fig. 57: Selection of the Ethernet adapter
The number of available ports (in this case 4) depends on the settings of the CU2508 device (see there).
44 Version: 2.6 Real-time Ethernet port multiplier