Common Axis Parameters

A Servo axis is closed loop: commands are sent to the axis and feedback is read from the axis. After selecting this option you will need to define the Axis Data Parameters and Axis Limits Parameters.

A Digitizing axis is read-only, open loop. Secondary feedback can be read by reading the actual position of the axis assigned to the secondary feedback. Digitizing axes can use extra feedback from the Drive or a third-party EtherCATEtherCAT is an open, high-performance Ethernet-based fieldbus system. The development goal of EtherCAT was to apply Ethernet to automation applications which require short data update times (also called cycle times) with low communication jitter (for synchronization purposes) and low hardware costs feedback deviceA process whereby some proportion of the output signal of a system is passed (fed back) to the input. In automation, a device coupled to each motor to provide indication of the motor's shaft angle, for use in commutating the motor and controlling its speed and position. Selecting a third-party EtherCAT feedback device will require you to enter EtherCAT Bus data (see Digitizing Axis Parameters) which will vary depending upon your EtherCAT devices. Also see How To Create a Digitizing Axis for specifics on different methods.

A Virtual Servo is a servo axis with no feedback or drive hardware. The feedback for a virtual servo axis is automatically generated from the command position. There is no limit to the number of virtual axes that may be used in an application.