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Published online by Cambridge University Press: 12 April 2016
The main reflector of FAST consists of about 1800 elementary units. Each unit has three adjustable supports to fix its position, and its position is adjusted by means of mechanical actuators. According to the radio source position at any given time, all the actuators are continuously adjusted to form a proper paraboloid in real time during the course of the observation. The basic requirements of such a control system are discussed. A fieldbus control system based on LonWorks technology is suggested to control all 1800 actuators. The main advantages of this distributed control system are its reliability, flexibility, efficiency and economics.