Communication system for an interaction system

A system for performing interactions within a physical environment, the system including: a robot having a robot base that undergoes movement relative to the environment and a robot arm mounted to the robot base, the robot arm including an end effector mounted thereon; a communications system including a fieldbus network; a tracking system including a tracking base positioned in the environment and connected to the fieldbus network, and a tracking target mounted to a component of the robot, wherein the tracking base is configured to detect the tracking target to allow a position and/or orientation of the tracking target relative to the tracking base to be determined; and a control system that communicates with the tracking system via the fieldbus network to determine the relative position and/or orientation of the tracking target and controls the robot arm in accordance with the relative position and/or orientation of the tracking target.