基于FPGA的EtherCAT主站研究

EtherCAT which is an Ethernet real time field bus is used in the industrial field more and more widely. In motion controller, CNC system, support the EtherCAT protocol to realize the control of digital servo drives the upper, and puts forward a kind of based on FPGA EtherCAT master implementation scheme with soft core with NiosII the protocol stack, including application layer and data link layer and the network card drive; The master clock in FPGA to achieve common crystal oscillator frequency compensation, enables the primary station to stable clock frequency synchronization to the reference clock; to achieve communication and motion control between the master station and the servo drive. Experimental results show that based on FPGA soft core EtherCAT master can not only to nanosecond time synchronization control the master-slave system, realize the task with the communication and control of servo, also make full use of the FPGA logic unit, saving hardware resources and all the modules can be implemented in field programmable gate array (FPGA), offer a compact and efficient solution for realizing the CNC technology, high speed, high precision, multi channel.