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Relay device and communication network

A communication network and relay device technology, applied in data exchange network, radio relay system, data exchange through path configuration, etc., can solve problems such as network operation obstacles, wrong connection of communication paths, etc., and achieve the effect of easy detection

Active Publication Date: 2018-02-09
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, in an FA network constructed by connecting various FA devices to a relay device such as a Layer 2 switch, the communication path may be wrongly connected due to human error or the like, and a loop path may be formed.
In the FA network, due to the formation of loop paths and network storms, it will bring obstacles to the operation of the network

Method used

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  • Relay device and communication network
  • Relay device and communication network
  • Relay device and communication network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] figure 1 It is a figure which shows an example of the CC-Link IE network which is a communication network concerning this invention. A CC-Link IE network is composed of a network of the same segment (segment), in which a plurality of communication terminals are connected in a line or star form via Ethernet.

[0025] figure 1 The illustrated communication network is constituted by including: a communication terminal 10X operating as a master device; a plurality of communication terminals 10A to 10D operating as slave devices; and a layer 2 switch 20 among which relay device. The communication terminal 10 (communication terminals 10X, 10A to 10D) has two communication ports, and the communication port of the communication terminal 10 is connected to the communication port of the other communication terminal 10 or the communication port of the layer 2 switch via a LAN (Local Area Network) cable. connect. The communication terminal 10 is connected to or embedded in FA (...

Embodiment approach 2

[0039] Next, a relay device (layer 2 switch) according to Embodiment 2 will be described. In addition, it is assumed that the structure of the layer 2 switch is the same as that of Embodiment 1 (refer to figure 2 ).

[0040] In the first embodiment described above, the operation of the layer 2 switch 20 in the case where the communication port satisfying the loop detection condition (number of received TestData frames per unit time>threshold value) is a single communication port has been described. However, in this embodiment, the operation of the layer 2 switch 20 in the case where there are a plurality of communication ports satisfying the loop detection condition will be described. In addition, there are a plurality of communication ports satisfying the loop detection condition, and the following cases are conceivable: Figure 4 The illustrated situation, in particular, the situation where a loop path is formed between the communication ports of the Layer 2 switch 20; an...

Embodiment approach 3

[0049] In Embodiments 1 and 2 described above, the steps in which the layer 2 switch 20 detects a loop path and automatically eliminates the loop path have been described. The route is notified to the network administrator.

[0050] Image 6 It is a diagram showing a configuration example of a communication network including a network management device that manages alarm information on the CC-Link IE network. Image 6 The communication network shown is composed of the following components: a communication terminal 10X operating as a master device; a plurality of communication terminals 10A to 10C operating as slave devices; a layer 2 switch 20 serving as a relay device; and network management device 40. exist Image 6 In the illustrated communication network, the first communication port (Port_X1) of the communication terminal 10X is connected to the communication port (Port_1) of the network management device 40, and the second communication port (Port_X2) of the communica...

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Abstract

A relay device forming a communication network includes a plurality of communication ports that transmit and receive frames, and a reception frequency monitoring unit. The reception frequency monitoring unit monitors, for each communication port, a reception frequency of a control frame periodically transmitted from a communication device forming the communication network into the communication network. The reception frequency monitoring unit instructs the communication port whose reception frequency exceeds a threshold to stop the frame transmission and reception operation.

Description

technical field [0001] The present invention relates to a relay device that relays frames transmitted and received between communication devices forming a communication network. Background technique [0002] In recent years, Ethernet (registered trademark) has also been developed in the industrial field, and a communication network (hereinafter referred to as the for the FA network). In an FA network, FA devices requiring real-time performance are usually connected and controlled using Ethernet. As an FA network based on Ethernet, CC-Link IE (registered trademark) is known. [0003] In CC-Link IE, the communication device on the control side (hereinafter referred to as the master device) and the communication device to be controlled (hereinafter referred to as the slave device) are connected using Ethernet, and the multicast communication is used to realize the command. Card passing (token passing) way to communicate (for example, patent document 1). [0004] According t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/28H04L12/705H04L45/18
CPCH04L12/4625H04L49/35H04L49/506H04L12/403H04B7/14H04L43/16
Inventor 中安俊行
Owner MITSUBISHI ELECTRIC CORP
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