The SERCOS interface is a foundation for building distributed multi-axis control systems for a myriad of applications. Distributed control improves machine flexibility by moving processing power and decision making from the CNC or motion control down into the drives and sensors. These devices then become intelligent building blocks that can easily be added to a machine or production line without major changes in hardware and software. The SERCOS interface is well suited for distributed control because it places axis-dependent control functions, such as loop closures, interpolation, and registration, in the drives, not in the motion controller. Thus, motion controllers can concentrate on motion control profiles and tool paths independent of the axes. In operation, the control issues a position command to the drive, which then closes its own loops and micro-interpolates its trajectory, based on previously downloaded parameters. The SERCOS interface also integrates input/output functions such as limit switches, pushbuttons and various sensors.