Data Interoperation method used for bus-based numerical control system

The invention relates to a data interoperation method used for a bus-based numerical control system. The data interoperation method comprises the following steps: a field bus driving program applies for a sharing buffer area and is initialized; a thread of a movement controller of the numerical control system is loaded and shares the sharing buffer area applied by the field bus driving program; in the applied sharing buffer area, the data interoperation of the numerical control system is realized by a reading-writing operation of the sharing buffer area and the field bus driving program. The data interoperation method with a small occupying space satisfies the instantaneity, the synchronism, the reliability and the safety of the data interaction between interpolation data of the bus-basednumerical control system and field bus driving feedback data.