FPGA (Field Programmable Gate Array)-based EtherCAT (Ethernet Control Automation Technology) main station device

Abstract

The invention discloses an FPGA (Field Programmable Gate Array)-based EtherCAT (Ethernet Control Automation Technology) main station device. The device comprises an EtherCAT bus interface RJ45, a network isolation transformer, a PHY (Physical Layer) chip, an FPGA module and a PCI / ARM (Peripheral Component Interconnection / Random Access Memory) extension interface, wherein the FPGA module is used for receiving data transmitted to an FPGA module by a CPU (Central Processing Unit) through an extension interface module; instruction data of the CPU is packaged and scheduled by an EtherCAT protocol drive module in the FPGA module to form a data frame to be transmitted to the PHY chip; the data frame is converted into a differential signal by the PHY chip and is transmitted to the EtherCAT network; after an EtherCAT data frame is received by each slave station, corresponding processing is performed and then the data frame is returned to a main station; after the data frame passes through the network transformer and the PHY chip, the data frame in the network is received by a data frame receiving module; the data frame is analyzed in the EtherCAT protocol drive module to extract effective data for the CPU to read a state and feed back data. According to the device, the communication with the CPU with the PCI interface or the ARM interface can be realized; the device has the advantages of good platform compatibility, high stability, high efficiency, high real-time property and the like, and has important application prospect to industrial automatic control.

Description

technical field [0001] The invention belongs to the field of industrial Ethernet field bus communication, in particular to an FPGA-based EtherCAT master station device. Background technique [0002] With the advancement of electronics and communication technology, industrial automation control has gradually changed from the traditional point-to-point centralized control mode to the network-based fieldbus communication control mode. The field bus control system integrates the control and monitoring equipment of the industrial site into a communication network through serial signals, and has the advantages of full digital, two-way and serial multi-node. The fieldbus communication system based on industrial Ethernet can realize the high-speed and low-jitter control of 100M Ethernet, and is widely used in various high-speed and high-precision motion control systems. [0003] EtherCAT is a fieldbus communication protocol based on industrial Ethernet. Because of its wide applicab...

AI Technical Summary

Problems solved by technology

However, the existing implementation of this EtherCAT master station uses the cooperation of CPU and network card to process the sending and receiving operations of data frames, which reduces the stability of data frame sending and receiving. At the same time, the single buffer operation mode of network card also reduces the efficiency of data sending and receiving, resulting in Stability and efficiency issues in industrial environments; secondly, the EtherCAT master station of this master station solution cannot be widely compatible with various operating systems, and it is difficult to transplant, which causes compatibility problems of platform resources; finally, for real-time For control systems with strict performance requirements, using software interrupts to ensure real-time cannot meet industrial requirements, resulting in loss of real-time performance, which is not conducive to high-precision real-time control systems

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