BECKHOFF CP-Link3 - Manual (Page 63)

Page 63
After the device has been added the NetID of the target system can be defined on the "Remote" tab. This can either be
entered directly or also determined by the "Choose Target" button. When the target system has been reached then
connected boxes can be addressed and configured as usual. The recommended cycle time for data exchange with the
terminals at the Bus Coupler is still between 50 and 80 ms (see also cycle time for data exchange ).
Note
A USB Bus Coupler may only be used from a single TwinCAT IO system.
It must be ensured that the USB Bus Coupler is not addressed by two different
TwinCAT I/O systems. When the USB coupler is read from the TwinCAT I/O system of
the host via ADS then it may not be used any more by the local TwinCAT I/O system on
the client.
2.b "Virtual USB Interface (Remote)" via RT Ethernet
When an RT Ethernet connection is used for communication with the "Virtual USB Interface (Remote)" the data is
exchanged in deterministic cycle times, and this allows the I/O channels of the CPx8xx to be read and written