Is there a Servo System that has full-closed control?

Full-closed control is possible by installing a DeviceNet Communications Unit (R88A-NCW152-DRT) in an OMNUC W-series Servo Driver.

A DeviceNet Communications Unit provides a DeviceNet communications interface and position control functions. The Servo Driver can be treated as a slave in the DeviceNet network and used as a Network Driver. Phases A, B, and Z of the external encoder can be incorporated into the DeviceNet Communications Unit to enable full closed-loop control.