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Link redundant control method based on EPA network bridge

A redundant control and network bridge technology, applied in the field of network communication, can solve the problems of different function definitions and the inability to effectively isolate the communication data of micro-network segment equipment, and achieve the effect of improving reliability, reliable message processing and forwarding

Active Publication Date: 2010-06-30
CHONGQING UNIV OF POSTS & TELECOMM
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  • Application Information

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Problems solved by technology

However, the function definitions of the switch and the EPA bridge are different, and the control method of the switch to realize link redundancy cannot realize the effective isolation of the communication data of the micro-network segment devices; at the same time, there is no better link redundancy control method for the EPA network. solution

Method used

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  • Link redundant control method based on EPA network bridge
  • Link redundant control method based on EPA network bridge
  • Link redundant control method based on EPA network bridge

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Embodiment Construction

[0014] The implementation of the present invention will be specifically described below with reference to the accompanying drawings and specific examples.

[0015] figure 1 For EPA network topology, including two network segments: monitoring level L 2 Segment and field device level L 1 network segment. Field device level L 1 The network segment is used to realize the connection between various field devices in the industrial production site and between the field devices and L 2 Connection of network segments; monitoring level L 2 The network segment is mainly used to realize the connection between the instruments, devices and man-machine interface in the control room. Either monitor level L 2 Network segment or field device level L 1 A network segment can be divided into one or several micro-network segments. Each micro network segment is used as a control area for connecting multiple EPA devices. In a control area, EPA devices communicate with each other to achieve s...

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Abstract

The invention seeks protection for a realizing method of link redundant control of an EPA network bridge and relates to the field of industrial field control. The invention realizes an EPA network link redundant function and a redundant managing function on the EPA network bridge. The method adopts an STP spanning tree algorithm to realize the link redundant function and to analyze network paths. If a loop exists in the network, the most robust link is selected as a communication link, the others are redundant backup links, a network bridge port which is connected with the redundant backup links in the loop is set to a blocking state, and the network is pruned to a non-loop tree topologic structure. The redundant link managing function provided by the invention uses an STP redundant managing protocol to manage the communication link automatically, thus improving the reliability, stability and robustness of the whole EPA network. The method is suitable for industrial Ethernet of high reliability and high real-time data transmission.

Description

technical field [0001] The invention relates to network communication technology, in particular to a link redundancy control method of an EPA (Ethernet-based industrial automation) network. Background technique [0002] EPA real-time Ethernet is a new open real-time Ethernet standard suitable for industrial field devices, which applies a large number of mature IT technologies to industrial control systems. The EPA system is a distributed system. It uses protocols such as ISO / IEC8802-3, IEEE802.11, and IEEE802.15 to connect several devices, micro-network segments, and control / monitoring devices distributed on site, so that all devices can work together Operation, collaboratively complete the measurement and control in industrial production process and operation. [0003] EPA networks are used in industrial sites, and the reliability requirements are very strict. The EPA bridge is an important device in the EPA product chain. It interconnects two or more micro-network segmen...

Claims

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Application Information

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IPC IPC(8): H04L12/24H04L12/56H04L1/22
Inventor 向敏王平周涛孙韶伟周川
Owner CHONGQING UNIV OF POSTS & TELECOMM
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