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Ring communication network slave node increasing and decreasing method, device and system

A technology of ring communication and network nodes, applied in the field of communication, can solve the problems of not proposing corresponding methods, being unable to do anything with real-time requirements, and lengthening the communication period.

Active Publication Date: 2015-07-08
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A highly available, seamlessly redundant ring communication network (High-availability Seamless Redundancy, HSR) can solve the problem of packet loss, but the forwarding mechanism of the ring communication network makes its communication efficiency relatively low, because each node is receiving data packets It is necessary to judge the type of the data packet first to decide whether to forward or stop the data packet. At the Ethernet rate of 100Mbit / s, the delay time for the data packet to pass through each node is at least 2us. When there are many nodes , the communication cycle will become longer until it is unacceptable, so the ring communication network is only suitable for substation automation and other applications, but it is powerless for applications with high real-time requirements. node, HSR did not propose a corresponding method
[0006] At present, there is no suitable method of adding or removing nodes suitable for the scenario of industrial communication system for mission-critical applications

Method used

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  • Ring communication network slave node increasing and decreasing method, device and system
  • Ring communication network slave node increasing and decreasing method, device and system
  • Ring communication network slave node increasing and decreasing method, device and system

Examples

Experimental program
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Embodiment 1

[0058] Embodiment 1 of the present invention provides a method for adding or removing slave nodes in a ring communication network, which can be applied to the existing HSR network or to the preferred ring communication network described above. The flow chart is as follows image 3 shown, including:

[0059] Step S301: the master node determines the position of the slave node to join the network according to the modified feedback frame received from all the slave nodes;

[0060] The to-be-joined slave node modifies the feedback frame when forwarding the feedback frames of other slave nodes.

[0061] The feedback frame can be the feedback frame sent by the other slave nodes for the command frame of the master node, or it can be the feedback frame sent by other slave nodes to the master node for other types of frames. Here, the The feedback frame is used to feed back the information of the slave node to the master node, and the master node does not need to use a special query fr...

Embodiment 2

[0087] Embodiment 2 of the present invention provides a method for adding or subtracting slave nodes in a ring communication network. The structural diagram of the ring communication network used to illustrate the method is as follows Figure 4 As shown, including a master node and 4 slave nodes.

[0088] After the system is powered on, the default network ID of the master node is 0, and the default network ID of the slave node is 255. After the self-inspection of the master node is completed, the encoding and sorting of the network is initiated through the network port B, and a network ID number is re-assigned to each slave node in sequence. The master node encodes the 4 slave nodes in sequence to establish the correspondence between the network ID and the logical ID The relational table is initialized at this time. The network connection relationship when the initialization is completed is Figure 4 shown. The correspondence table is as shown in Table (1).

[0089] ...

Embodiment 3

[0099] Based on the same inventive concept as that of Embodiment 1 of the present invention, Embodiment 3 of the present invention provides a method for adding or removing slave nodes in a ring communication network, the flow chart of which is as follows Figure 9 shown, including:

[0100] Step S901: the slave node to be added modifies the feedback frame when forwarding the feedback frame of other slave nodes;

[0101] The feedback frame can be the feedback frame sent by the other slave nodes for the command frame of the master node, or it can be the feedback frame sent by other slave nodes to the master node for other types of frames. Here, the The feedback frame is used to feed back the information of the slave node to the master node, and the master node does not need to use a special query frame to obtain the information that the slave node has joined, so it can reduce additional bandwidth overhead and improve system performance.

[0102] The modification feedback frame ...

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Abstract

The invention discloses a ring communication network slave node increasing and decreasing method, a device and a system. The method comprises steps: according to modified feedback frames in received feedback frames of all slave nodes, a master node determines adding network positions of to-be-added slave nodes, and according to the positions, a corresponding relationship between logic identifiers and network identifiers is modified; encoding frames with the network identifiers are sent to the to-be-added slave nodes, and the to-be-added slave nodes are indicated to modify self network identifiers to be the network identifiers in the encoding frames. On one hand, a special query frame is needed, and thus extra bandwidth overhead can be reduced; on the other hand, the feedback frames are used for acquiring information of the adding network positions of the to-be-added slave nodes, network adding of slave nodes can be completed in only one communication cycle; and thus, no packet loss during node increasing and decreasing processes of the communication system can be ensured, synchronization performance does not fall, and the communication efficiency is not reduced.

Description

technical field [0001] The present invention relates to communication technology, in particular to a method, device and system for increasing or decreasing slave nodes in a ring communication network. Background technique [0002] In industrial communication systems for mission-critical applications, since availability and reliability are key issues, communication network redundancy is an important feature of industrial communication systems requiring high availability. Compared to redundancy schemes such as Parallel Redundancy Protocol, ring topology can provide a lower cost technical solution. In a ring network, each node has two communication ports connected to two adjacent nodes, so the ring network can operate in either or both directions providing resilience against link failure. [0003] However, in some industrial applications, such as uninterruptible power supply, in addition to requiring high availability and high communication efficiency, it is also required that...

Claims

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Application Information

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IPC IPC(8): H04L12/437
Inventor 姚詹图周朝阳
Owner EMERSON NETWORK POWER CO LTD
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