The tower clock is divided into indoor and outdoor parts from the appearance, and there is a master clock control system in the room. The outdoor is the sub-clock part, which can be divided into movement, clock hands, scales, lighting system and time-telling speaker parts. The outdoor clock controller itself has a clock circuit that generates signals with an accuracy of 2 seconds. At the same time, the CPU continuously receives time signals from GPS and Beidou signals, and corrects its own time signals to ensure the accuracy of its time signals. The clock continuously sends the time signal to the sub-clock, and outputs the actuation signal to actuate the motor to complete the travel time. The slave clock transfers its state to the master clock and is monitored by the master clock. At the same time, the travel time of the slave clock is also monitored by the feedback switch, so as to ensure that the whole slave clock forms a closed-loop system. The master clock and the child clock constitute a large closed-loop system. Therefore, the accuracy of the entire building clock system is guaranteed.
