Industrial control network slave station communication method and device based on EtherCAT protocol

Abstract

The invention provides an industrial control network slave station communication method based on an EtherCAT protocol. The method comprises the following steps: (1) receiving an EtherCAT frame from Ethernet, writing header information of the frame into a frame header register, and writing frame data into a reception buffer module; (2) reading the header information of the frame from the frame header register, writing the read header information into a transmission buffer module, reading and resolving a sub-message in the ECAT frame from the reception buffer module in parallel at the same time, generating response data for responding to the EtherCAT frame according to the EtherCAT protocol, and writing the response data into the transmission buffer module; and (3) after completion of the step (2), constructing a complete response data frame according to the data of the transmission buffer module, and transmitting the response data frame to the Ethernet. The invention also provides a corresponding slave station communication device. The scheme of the invention is low in cost, contributes to large-scale deployment, and can be suitable for industrial applications in various different fields. On the premise of ensuring compatibility with a plurality of instruction modes, high robustness and high reliability can be ensured, and the data receiving and transmitting success rates and the communication rate are increased.

Description

technical field [0001] The invention relates to the technical field of industrial Ethernet, in particular, the invention relates to a communication method and device for slave stations of an industrial control network based on the EtherCAT protocol. Background technique [0002] EtherCAT is a real-time industrial Ethernet technology proposed by German BECKHOFF Automation Company in 2003. It has the characteristics of high speed and high data efficiency, supports multiple device connection topologies, and is widely used in industrial automatic control systems. EtherCAT is an open real-time Ethernet communication protocol. It sets a new standard for the real-time performance of the system and the flexibility of the topology, and reduces the cost of using the field bus to a certain extent. It also has high speed and high data efficiency. It supports multiple device connection topologies. [0003] Specifically, the main advantages of the EtherCAT protocol are as follows: [0...

AI Technical Summary

Problems solved by technology

[0009] At present, the hardware device that realizes the slave station communication in the EtherCAT protocol mainly includes the ET1100 chip, which can be purchased in the market, but the price is very expensive

In actual industrial applications, it is often necessary to equip a large number of slave stations. If a slave station based on the ET1100 chip is configured at each required position in the factory, the cost will be very high

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