A solution for Ethernet-based real-time communication network of Distributed Numerical Control system

To improve the excellent compatibility and high real-time communication of Distributed Numerical Control (DNC) system, this paper presents an Ethernet-based solution on real-time communication for each level of DNC, especially in the motion control level. In this solution, CSMA/CD in Ethernet takes the non-determinism, but for keeping Ethernet's compatibility and other advantages, a real-time control protocol is designed into the protocol stack of MAC and TCP/IP. And according the main features of DNC communication, a real-time control police based on time slot mechanism with CSMA/CD are proposed accordingly to schedule determinism, time-synchronization and short-circle transmission in the DNC control network. The feasibility of the solution has been tested by simulations and experiments. Thus, it provides a reference for real-time communication technologies of advanced manufacturing system.