Communication method and device for high-speed real-time industrial Ethernet

A communication method, Ethernet technology, applied in the communication method and device field of high-speed real-time bus, to achieve the effect of good data transmission real-time capability, precise clock synchronization, and the effect of improving data transmission rate

Inactive Publication Date: 2010-12-15
BEIHANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-speed real-time industrial Etherne

Method used

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  • Communication method and device for high-speed real-time industrial Ethernet
  • Communication method and device for high-speed real-time industrial Ethernet
  • Communication method and device for high-speed real-time industrial Ethernet

Examples

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Example Embodiment

[0053] Embodiment 1: The specific implementation of the present invention provides a high-speed real-time bus communication method. The technical scenario of this embodiment is a master station board, a slave station board, plus ordinary Ethernet physical interfaces and network cables. Let's take the normal data communication cycle as an example, the system has 5 slave stations.

[0054] The main operations of the master station are:

[0055] Because this data packet is a data communication packet, the command is a FPRW read and write command, the cmd field is 0x6, the position addressing address of each slave station is 1, 2, 3, 4, 5, and the physical address offset is 0. Take the application The data to be transmitted by the layer to each slave is written into the corresponding data segment of each slave, and the length of each slave data segment and the total length of each slave data field are filled in the corresponding fields, etc., that is, according to the long frame struct...

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PUM

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Abstract

The invention discloses a communication method and a communication device for a high-speed real-time industrial Ethernet. Data transmission is performed by a total frame mode; and the method comprises the following steps of: analyzing an address of a slave station data field in a data message; and performing data switching on a corresponding field in a frame by each slave station after address matching; and thus the aim of noncompetitive data transmission is fulfilled and the real-time requirement of a system is met. The method of the invention is particularly implemented through the communication device for a high-speed real-time bus consisting of a normal network card chip and a Field Programmable Gate Array(FPGA), wherein the FPGA is mainly used for receiving, analyzing and forwarding a data packet according to a transmission protocol; the data frame of the method and the device can timely arrive at target end equipment, so the real-time requirement of the data transmission is met;the mechanism for the data transmission is that the receiving, the analyzing and the forwarding are simultaneously performed without competition or contention; the real-timeness is achieved; and a general Ethernet chip is used as a physical layer, so the transmission speed is improved compared with that of the conventional industrial buses.

Description

technical field [0001] The invention relates to the fields of high-speed data transmission application and robot control, in particular to a high-speed real-time bus communication method and device. Background technique [0002] Internationally advanced CNC machine tools and industrial robot control systems use fieldbus to connect digital servos and IO devices to form a fieldbus computer control system. The performance of the field bus of the CNC system team requires real-time bus transmission, synchronization of command execution and status feedback, and periodicity of command transmission. These characteristics of existing buses (such as CAN bus, Ethernet, etc.) are due to their real-time and communication capabilities. Due to bandwidth and other reasons, it is not suitable for use in numerical control systems. [0003] Traditional Ethernet solutions that provide real-time functions mostly prohibit the CSMA / CD access process through a higher-level protocol layer, and use ...

Claims

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Application Information

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IPC IPC(8): H04L12/28H04L12/40H04L12/56H04L45/741
Inventor 陈友东魏洪兴杜瑞芳申广涛王田苗
Owner BEIHANG UNIV
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