A New Error-Correcting Transmission Method for Dual Ring Fieldbus in CNC System

For solving the security problems caused by the errors occurred during the real-time transmission of the fieldbus in the CNC system, a new transmission scheme, which involves the error detection and self-correction, was proposed based on the dual ring fieldbus in the CNC system. This scheme specifies a structure of two-way transmission in fieldbus and a data format with self-correcting function as well as related detection and correction method was designed. The result of testing demonstrated that, comparing to the existed method, this scheme excellently met the real-time requirements of CNC system while effectively reducing the retransmission probability and improving the efficiency.