EtherCAT Slave Microprocessor Design And Implementation

Industrial Ethernet is a important development direction in current industry-al control of fieldbus technology. Compared to the traditional techniques of fi-eldbus, Ethernet fieldbus has characteristic of transmission speedly, packets cap-ac-ity, long distance transmission and good performance. As a typical technolo-gy of real-time industrial Ethernet technology,put forward by Germany BECKH-OFF automation company in2003.EtherCAT made full use of the Ethernet ful1-du-plex characteristics,use master-slave media access control model,master sen-d the Ethernet frame to slave,slave find date from the Ethernet frame or insert date to the Ethernet frame.Slave use specialized control chip,master use the sta-ndard Ethernet controller.EtherCAT has characteristic of widely applicable,with out affiliate subnet,support a variety of equipment connection topological struct-ure,high efficiency,shot refresh cycle,good synchronization performance.And full compliance with Ethernet standard.The EtherCAT networked control system in modern industry is universal.Just different in different application layer equipm-ent.EtherCAT networked control system greatly improve the performance of the field bus.This paper mainly research the realization process of data exchange between master and slave by microprocessor in EtherCAT networked control system.The data communication protocol of this system is CANopen. First we introduced the system structure,then we designed the hardwire of slave microprocessor,PCB design and chip welding.And then we learn and research the CANopen protocol.According to the CANopen protocol,we designed the driver of microprocessor LPC1754.At last,we test our driver by PDO and SDO communicatin with the master.and test our driver with the AD converter of LPC1754by automation sofware TwinCAT and analyzed the test results.We can find that from the finall results,the driver we designed could run well in the LPC1754we designed,and could complete the date pakage and date analytical of CoE frame,could realize accurately the date exchange of master and slave.The LPC1754we designed could do the work of EtherCAT slave microprocessor. The module is stable and reliable, and can meet the basic needs of networked control systems, to contribute to the modern industrial production and related industry.