CN115001898A - Network equipment redundant communication system and method - Google Patents

Network equipment redundant communication system and method Download PDF

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Publication number
CN115001898A
CN115001898A CN202210495374.XA CN202210495374A CN115001898A CN 115001898 A CN115001898 A CN 115001898A CN 202210495374 A CN202210495374 A CN 202210495374A CN 115001898 A CN115001898 A CN 115001898A
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Prior art keywords
gateways
group
slave stations
master station
slave
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Inventor
刘龙
朱波
曾重阳
武昊
梁浩
赵安安
乔文可
叶伟
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CRSC Urban Rail Transit Technology Co Ltd
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CRSC Urban Rail Transit Technology Co Ltd
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Priority to CN202210495374.XA priority Critical patent/CN115001898A/en
Publication of CN115001898A publication Critical patent/CN115001898A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40169—Flexible bus arrangements
    • H04L12/40176—Flexible bus arrangements involving redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40241—Flexray
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

The invention provides a network equipment redundant communication system and a method, wherein the system comprises: a plurality of sets of slave stations, each set of slave stations comprising a plurality of slave stations; each group of gateways comprises a plurality of gateways, each group of gateways corresponds to each group of slave stations one by one, and each gateway in each group of gateways is in signal connection with each slave station in each group of slave stations corresponding to each group of gateways through a bus type topological structure; the master station is in signal connection with the multiple groups of gateways through a ring-shaped topological structure and is used for reading and writing data from the slave stations through the gateways. The invention reduces the influence on other communication nodes when the communication node fails to work in various scenes to different degrees.

Description

Network equipment redundant communication system and method
Technical Field
The present invention relates to the field of network communication technologies, and in particular, to a network device redundant communication system and method.
Background
The Ethercat fieldbus technology is a real-time industrial fieldbus communication protocol based on an Ethernet development framework, and has the characteristics of high performance, flexible topological structure, easy application, low cost, high-precision equipment synchronization, selectable cable redundancy, functional safety protocol, hot plug and the like.
The Ethercat field bus adopts a master-slave communication mechanism, and only one master station but a plurality of slave stations can be arranged in one communication network. The master station and the slave stations form a ring network, and the master station can read and write interactive data between the master station and the slave stations according to a set period. The structure of the Ethercat communication bus is shown in FIG. 1, and all nodes needing communication are connected end to form a ring. In the loop, data is transmitted in one direction. The data sent by the sending end returns to the sending end after going around for a circle, and the sending end deletes the data from the ring. Data sent by any one node may be received by other nodes on the ring.
The Ethercat ring network topology has the defect that when one communication node fails, the communication rate of other nodes can be influenced, but communication interruption cannot be caused. When two communication nodes fail, there is a possibility that a communication abnormality of a node having no failure is caused depending on the positions of the nodes.
Disclosure of Invention
The invention provides a network equipment redundant communication system and a method, which are used for solving the problem that the communication rate of other nodes is influenced when a single communication node fails in a ring network topology in the prior art; the defect that the communication of a normal node is influenced when a plurality of communication nodes are in fault is overcome, and the influence on other communication nodes when the communication nodes are in fault is reduced.
The invention provides a network equipment redundant communication system, comprising:
a plurality of sets of slave stations, each set of slave stations comprising a plurality of slave stations;
each group of gateways comprises a plurality of gateways, each group of gateways corresponds to each group of slave stations one by one, and each gateway in each group of gateways is in signal connection with each slave station in each group of slave stations corresponding to each group of gateways through a bus type topological structure;
the master station is in signal connection with the multiple groups of gateways through a ring-shaped topological structure, and the master station is used for reading and writing data from the slave station through the gateways.
According to the network equipment redundant communication system provided by the invention, each gateway in each group of gateways is connected with each slave station in each group of slave stations corresponding to each group of gateways through a flexray communication bus, and the master station is connected with the multiple groups of gateways and the multiple groups of gateways through an ethercat communication bus.
According to the network equipment redundant communication system provided by the invention, each gateway in each group of gateways is used for forwarding data sent by a master station to each group of slave stations corresponding to each group of gateways; forwarding the feedback information of each group of slave stations corresponding to each group of gateways to the master station;
each slave station is used for reserving one of the received multiple data;
the master station is used for reserving one piece of feedback information in the received multiple pieces of feedback information.
According to the network equipment redundancy communication system provided by the invention, each slave station is used for comparing the received multiple copies of data, and reserving one copy of data in the received multiple copies of data under the condition that the contents of the multiple copies of data are consistent and the receiving time is consistent;
the master station is used for comparing the received multiple copies of feedback information, and reserving one copy of data in the received multiple copies of feedback information under the condition that the content of the multiple copies of feedback information is consistent and the receiving time is consistent.
According to the network equipment redundancy communication system provided by the invention, the number of the gateways in each group of gateways is two.
The invention also provides a network equipment redundant communication method, which is applied to any one of the network equipment redundant communication systems and comprises the following steps:
forwarding the data sent by the master station to each group of slave stations corresponding to each group of gateways through each gateway in each group of gateways;
and forwarding the information fed back by each group of slave stations corresponding to each group of gateways to the master station through each gateway in each group of gateways.
According to the network equipment redundant communication system and method provided by the invention, the ring topology structure and the bus topology structure are combined, so that when a single slave station node fails, the communication rate of other nodes is not influenced; the master station and the slave station nodes do not directly communicate with each other, but complete data forwarding through the redundant gateway nodes, and the communication is still normal when any gateway node fails; when gateway node faults exist in any two groups of gateway nodes, all or part of the gateway nodes can normally communicate with the slave station nodes, and the influence of the communication nodes on other communication nodes when the communication nodes are in faults is reduced to different degrees in various scenes.
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In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a ring network topology of an ethercat communication bus provided in the prior art;
FIG. 2 is a schematic diagram of a redundant communication system for network devices according to the present invention;
FIG. 3 is a schematic structural diagram of a combination of a bus topology and a ring topology in a redundant communication system of a network device according to the present invention;
fig. 4 is a schematic flowchart of a network device redundant communication method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A network device redundant communication system of the present invention is described below in conjunction with fig. 2, comprising:
a plurality of sets of slave stations, each set of slave stations comprising a plurality of slave stations;
the redundant communication system of network equipment in fig. 2 has two sets of slave stations, one set of slave stations comprising slave stations 31, 32 and 33 and the other set of slave stations comprising slave stations 34, 35 and 36. The present embodiment is not limited to the number of groups of slave stations and the number of slave stations in each group of slave stations.
Each group of gateways comprises a plurality of gateways, each group of gateways corresponds to each group of slave stations one by one, and each gateway in each group of gateways is in signal connection with each slave station in each group of slave stations corresponding to each group of gateways through a bus type topological structure;
in fig. 2 there are two sets of gateways, one set of gateways comprising gateways 21 and 22 and the other set of gateways comprising gateways 23 and 24. Gateways 21 and 22 are redundant and gateways 23 and 24 are redundant. This embodiment is not limited to the number of groups of gateways and the number of gateways in each group of gateways.
The gateways 21 and 22 are connected to the slaves 31, 32, and 33 in a bus topology, and the gateways 23 and 24 are connected to the slaves 34, 35, and 36 in a bus topology.
The master station is in signal connection with the multiple groups of gateways through a ring-shaped topological structure, and the master station is used for reading and writing data from the slave station through the gateways.
The master station 1 and the gateways 21, 22, 23, 24 are connected by a ring topology. The master station and the slave stations communicate through the gateway, the master station is responsible for core operation, and the slave stations respectively complete different functions. The master station needs to communicate with the slave station to complete sending commands, collecting statuses, and the like.
In order to reduce the influence of a single communication node failure on the communication rate of other nodes (which needs to switch to another direction to retransmit data), the present embodiment combines a bus topology with a ring topology.
However, if the combined result is shown in fig. 3, this topology can effectively reduce the influence of partial node failure on the entire communication network, for example, the failure of any one of the slave stations 31, 32, 33, 34, 35, and 36 will not affect other slave stations. However, if a gateway 21 or 23 fails, the consequences are more severe than if a pure ring network were to occur. Such as a gateway 21 failure, will cause the slave stations 31, 32, 33 to interrupt communication with the master station. In order to reduce such an influence, in the present embodiment, a plurality of gateways for communication between each set of slave stations and the master station are provided, and gateway redundancy is implemented. When one of the gateways fails, the group of slave stations communicates with the master station through other normal gateways.
In the embodiment, by combining the ring topology structure and the bus topology structure, when a single slave station node fails, the communication rate of other nodes is not affected; the master station and the slave station nodes do not directly communicate with each other, but complete data forwarding through the redundant gateway nodes, and the communication is still normal when any gateway node fails; when gateway node faults exist in any two groups of gateway nodes, all or part of the gateway nodes can normally communicate with the slave station nodes, and the influence of the communication nodes on other communication nodes when the communication nodes are in faults is reduced to different degrees in various scenes.
On the basis of the above embodiment, in this embodiment, each gateway in each group of gateways is connected to each slave station in each group of slave stations corresponding to each group of gateways through a flexray communication bus, and the master station is connected to the multiple groups of gateways and the multiple groups of gateways through an ethercat communication bus.
Specifically, in the embodiment, for the connection between the master station and the gateway in the ring topology structure and between the gateways through the Ethercat communication bus, not only can the Ethercat field bus be adopted to exert the characteristic of high real-time performance, but also the influence of a single node fault on the whole communication network can be reduced.
For example, in fig. 2, the master 1 and the slaves 21 and 24 are connected by an ethercat communication bus, the slave 21 and the slave 22 are connected by an ethercat communication bus, the slave 22 and the slave 23 are connected by an ethercat communication bus, and the slave 23 and the slave 24 are connected by an ethercat communication bus.
FlexRay is a high-speed, deterministic, fault tolerant bus technology for automobiles, combines event triggering and time triggering, and has high network utilization rate and system flexibility.
The embodiment is used for the connection between the gateway and the slave station in a bus type topology structure through a FlexRay communication bus.
For example, in fig. 2, the gateways 21 and 22 are in a FlexRay network, which also includes slaves 31, 32 and 33. The gateway 21 and the slave stations 31, 32, and 33 are connected by a FlexRay communication bus, and the gateway 22 and the slave stations 31, 32, and 33 are connected by a FlexRay communication bus. The gateways 21 and 22 are responsible for forwarding communication data between the master 1 and the slaves 31, 32, 33.
The gateways 23 and 24 are in a FlexRay network which also comprises slaves 34, 35 and 36. The gateway 23 and the slave stations 34, 35, and 36 are connected by a FlexRay communication bus, and the gateway 24 and the slave stations 34, 35, and 36 are connected by a FlexRay communication bus. The gateways 23 and 24 are responsible for forwarding of communication data between the master 1 and the slaves 34, 35, 36.
On the basis of the foregoing embodiment, in this embodiment, each gateway in each group of gateways is configured to forward data sent by a master station to each group of slave stations corresponding to each group of gateways; forwarding the feedback information of each group of slave stations corresponding to each group of gateways to the master station; each slave station is used for reserving one of the received multiple data; the main station is used for reserving one piece of feedback information in the received multiple pieces of feedback information.
With reference to fig. 2, the communication flow between the master station and the slave station in this embodiment includes the following steps:
1. the master station 1 sends the data that needs to be sent to the slave stations 31, 32, 33 to the gateways 21 and 22 via the ethercat communication bus.
2. The gateways 21 and 22 transmit data to the slaves 31, 32 and 33, respectively, through a flexray communication bus.
3. In the case of normal network communication, the slave stations 31, 32, and 33 can receive the data transmitted by the two master stations, and one slave station is reserved.
4. The slave stations 31, 32, and 33 transmit feedback information to the gateways 21 and 22 through the flexray communication buses, respectively.
5. The gateways 21 and 22 send the feedback information to the master station via the ethercat communication bus.
6. Under the condition that the network communication is normal, the master station can receive the feedback information sent by the two copies 31, 32 and 33, and only needs to reserve one copy.
7. The master station communicates similarly with the slave stations 34, 35, 36.
For the screening of the repeated data, the screening can be completed by referring to the requirements in EN50159, and the description of this embodiment is omitted.
On the basis of the above embodiment, each slave station in this embodiment is configured to compare the received multiple copies of data, and retain one copy of the received multiple copies of data when the content of the multiple copies of data is consistent and the receiving time is consistent;
the master station is used for comparing the received multiple copies of feedback information, and reserving one copy of data in the received multiple copies of feedback information under the condition that the contents of the multiple copies of feedback information are consistent and the receiving time is consistent.
When all nodes in the system are normal, each slave station can receive two copies of data sent by the master station and the master station can also receive two copies of data sent by each slave station during each communication.
Due to communication delay and data tampering, the content and/or reception time of the multiple copies of data received by each slave station from the master station may not be uniform at each communication. And only one of the received contents is reserved under the condition that the received contents and the time are consistent, otherwise, an alarm message is sent out to prompt an operator to check.
On the basis of the above embodiments, in this embodiment, the number of gateways in each group of gateways is two.
And the communication between the master station and the slave station is completed by adopting redundant gateway nodes. The valid data is forwarded through two gateway nodes, and even if one gateway node fails, the communication is not interrupted.
Based on any one of the foregoing embodiments of the network device redundant communication system, as shown in fig. 4, this embodiment provides a network device redundant communication method, including: step 401, forwarding data sent by a master station to each group of slave stations corresponding to each group of gateways through each gateway in each group of gateways;
the master station is connected with the gateway through a ring topology structure. The master station and the slave stations communicate through the gateway, the master station is responsible for core operation, and the slave stations respectively complete different functions. The master station needs to communicate with the slave station to complete sending commands, collecting statuses, and the like.
And 402, forwarding the information fed back by each group of slave stations corresponding to each group of gateways to the master station through each gateway in each group of gateways.
The master station is connected with the gateway through a ring topology structure. The gateway and the slave station are connected in a bus topology structure. Each group of gateways includes a plurality of gateways, each group of gateways being redundant.
In the embodiment, by combining the ring topology structure and the bus topology structure, when a single slave station node fails, the communication rate of other nodes is not affected; the master station and the slave station nodes do not directly communicate with each other, but complete data forwarding through the redundant gateway nodes, and the communication is still normal when any gateway node fails; when gateway node faults exist in any two groups of gateway nodes, all or part of the gateway nodes can normally communicate with the slave station nodes, and the influence of the communication nodes on other communication nodes when the communication nodes are in faults is reduced to different degrees in various scenes.
On the basis of the above embodiment, the present embodiment further includes: comparing the multiple data received by the slave station, and reserving one of the received multiple data under the condition that the content of the multiple data is consistent and the receiving time is consistent;
and comparing the multiple copies of feedback information received by the main station, and reserving one copy of data in the received multiple copies of feedback information under the condition that the contents of the multiple copies of feedback information are consistent and the receiving time is consistent.
When all nodes in the system are normal, each slave station can receive two copies of data sent by the master station and the master station can also receive two copies of data sent by each slave station during each communication.
Due to communication delay and data falsification, the contents and/or reception times of the multiple copies of data received by each slave station from the master station at each communication may not be uniform. And only one of the received contents is reserved under the condition that the received contents and the time are consistent, otherwise, alarm information is sent out to prompt an operator to check.
On the basis of the above embodiments, in this embodiment, when any gateway fails, each group of slave stations communicates with the master station normally.
As shown in fig. 2, if the gateway 21 fails, the slave stations 31, 32 and 33 can still complete data exchange with the master station, and other gateway nodes can still normally communicate with the master station.
If the gateway 22 fails, the slave stations 31, 32 and 33 can still complete data exchange with the master station, and other gateway nodes can still normally communicate with the master station.
If the gateway 23 fails, the slave stations 34, 35 and 36 can still complete data exchange with the master station, and other gateway nodes can still normally communicate with the master station.
If the gateway 24 fails, the slave stations 34, 35 and 36 can still complete data exchange with the master station, and other gateway nodes can still normally communicate with the master station.
In addition to the above embodiments, in this embodiment, when any slave station fails, a normal slave station in each group of slave stations normally communicates with the master station.
In fig. 2, if any one of the slave stations 31, 32, 33, 34, 35 and 36 fails, other nodes in the present flexray bus network, any node in the ring network and other flexray bus networks are not affected.
Any plurality of nodes in the slave stations 31, 32, 33, 34, 35 and 36 have faults, and the faults do not affect other nodes in the flexray bus network, any node in the ring network and other flexray bus networks.
On the basis of the foregoing embodiments, in this embodiment, in each group of gateways adjacent to the master station, if at least one other gateway other than the gateway connected to the master station fails, each group of slave stations corresponding to each group of gateways adjacent to the master station normally communicate with the master station.
In fig. 2, if the gateway 22 and the gateway 23 fail at the same time, the master station 1 communicates with the gateway 24 first, and the gateway 24 communicates with the gateway 23 and the slave stations 34, 35, and 36. If the gateway 23 fails, the communication direction is switched, the master station communicates with the gateway 21, and the gateway 21 communicates with the gateway 22 and the slave stations 31, 32, and 33. Each group of slave stations can normally communicate with the master station.
If both the gateway 21 and the gateway 22 fail, the communication between the slave stations 31, 32, 33 and the master station is interrupted.
If both the gateway 23 and the gateway 24 fail, the slave stations 34, 35, 36 and the master station are interrupted from communicating.
If the gateway 21 and the gateway 23 fail simultaneously, the ethercat ring network is abnormal, but the slave stations 34, 35 and 36 normally communicate with the master station.
If the gateway 22 and the gateway 24 fail simultaneously, the ethercat ring network is abnormal, but the slave stations 31, 32 and 33 communicate with the master station normally.
If both the gateway 21 and the gateway 24 fail, the slave stations 31, 32, 33, 34, 35 and 36 are out of communication with the master station.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A network device redundancy communication system, comprising:
a plurality of sets of slave stations, each set of slave stations comprising a plurality of slave stations;
each group of gateways comprises a plurality of gateways, each group of gateways corresponds to each group of slave stations one by one, and each gateway in each group of gateways is in signal connection with each slave station in each group of slave stations corresponding to each group of gateways through a bus type topological structure;
the master station is in signal connection with the multiple groups of gateways through a ring-shaped topological structure and is used for reading and writing data from the slave stations through the gateways.
2. The redundant communication system of network equipment of claim 1, wherein each gateway in each group of gateways is connected to each slave station in each group of slave stations corresponding to each group of gateways through a flexray communication bus, and the master station is connected to the plurality of groups of gateways and the plurality of groups of gateways through an ethercat communication bus.
3. The redundant communication system of network equipment of claim 1, wherein each gateway in each set of gateways is configured to forward data sent by the master station to each set of slave stations corresponding to each set of gateways; forwarding the feedback information of each group of slave stations corresponding to each group of gateways to the master station;
each slave station is used for reserving one of the received multiple data;
the main station is used for reserving one piece of feedback information in the received multiple pieces of feedback information.
4. The network equipment redundancy communication system of claim 3, wherein each slave station is configured to compare the received multiple copies of data, and to retain one of the received multiple copies of data if the contents of the multiple copies of data are consistent and the receiving times are consistent;
the master station is used for comparing the received multiple copies of feedback information, and reserving one copy of data in the received multiple copies of feedback information under the condition that the content of the multiple copies of feedback information is consistent and the receiving time is consistent.
5. The redundant communication system of network devices of any of claims 1-4, wherein the number of gateways in each set of gateways is two.
6. A network equipment redundancy communication method applied to the network equipment redundancy communication system according to any one of claims 1 to 5, comprising:
forwarding the data sent by the master station to each group of slave stations corresponding to each group of gateways through each gateway in each group of gateways;
and forwarding the information fed back by each group of slave stations corresponding to each group of gateways to the master station through each gateway in each group of gateways.
7. The method of claim 6, further comprising:
comparing the multiple data received by the slave station, and reserving one of the received multiple data under the condition that the content of the multiple data is consistent and the receiving time is consistent;
and comparing the multiple copies of feedback information received by the main station, and reserving one copy of data in the received multiple copies of feedback information under the condition that the contents of the multiple copies of feedback information are consistent and the receiving time is consistent.
8. The method of claim 6 or 7, wherein each group of slave stations communicates with the master station normally in case of a failure of any gateway.
9. The method of claim 6 or 7, wherein in case of failure of any slave station, the normal slave station in each group of slave stations communicates normally with the master station.
10. The method according to claim 6 or 7, wherein in each group of gateways adjacent to the master station, if at least one other gateway except the gateway connected to the master station fails, each group of slave stations corresponding to each group of gateways adjacent to the master station normally communicates with the master station.
CN202210495374.XA 2022-05-07 2022-05-07 Network equipment redundant communication system and method Pending CN115001898A (en)

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