A chiller plant control system typically consists of sensors, actuators, and a control algorithm or logic that integrates the operation of various components. Sensors measure parameters such as temperature, pressure, flow rate, and energy consumption, while actuators control the operation of devices like valves, pumps, and chillers. The control algorithm or logic uses data from sensors to make decisions about how to optimize system operation, taking into account factors like load demand, energy efficiency, and equipment reliability.