WO2019167175A1 - Système de communication - Google Patents

Système de communication Download PDF

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Publication number
WO2019167175A1
WO2019167175A1 PCT/JP2018/007530 JP2018007530W WO2019167175A1 WO 2019167175 A1 WO2019167175 A1 WO 2019167175A1 JP 2018007530 W JP2018007530 W JP 2018007530W WO 2019167175 A1 WO2019167175 A1 WO 2019167175A1
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WIPO (PCT)
Prior art keywords
communication
communication device
address
packet
communication devices
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PCT/JP2018/007530
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English (en)
Japanese (ja)
Inventor
和諒 小出
吉田　実
治彦 竹山
佐藤　利光
宏平 田中
一紀 君家
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2020503168A priority Critical patent/JPWO2019167175A1/ja
Priority to PCT/JP2018/007530 priority patent/WO2019167175A1/fr
Priority to CN201880068479.9A priority patent/CN111742523A/zh
Publication of WO2019167175A1 publication Critical patent/WO2019167175A1/fr

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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

Definitions

  • This invention relates to a communication system.
  • Patent Document 1 discloses a communication system.
  • the communication apparatus discards its own transmission packet that has made a round around the ring network using the transmission source IP address of the packet of the broadcast address. For this reason, data can be transmitted bidirectionally in a ring network.
  • Patent Document 1 does not support general Ethernet (registered trademark) and general IP. For this reason, general Ethernet (registered trademark) hardware and a general IP routing function cannot be used.
  • An object of the present invention is to provide a communication system that can transmit data bidirectionally in a ring network while using Ethernet (registered trademark) and IP.
  • a one-side network interface to which a first IP address belonging to a first IP network address is assigned, and a second IP network address different from the first IP network address.
  • a plurality of communication devices each having an IP address of 2 assigned to each other, and one of the adjacent communication devices connected to one network interface and the other network interface of the other, And a plurality of communication paths that connect the plurality of communication devices in a ring shape.
  • the plurality of communication devices include a one-side network interface to which a first IP address belonging to a first IP network address is assigned, and a second IP network different from the first IP network address. And a second-side network interface to which a second IP address belonging to the address is assigned.
  • the plurality of communication paths connect the plurality of communication devices in a ring shape by connecting to one side network interface and the other side network interface of the plurality of adjacent communication devices. Therefore, it is possible to transmit data bidirectionally in a ring network while using a general Ethernet (registered trademark) and a general IP.
  • FIG. 1 is a configuration diagram of a communication system in Embodiment 1.
  • FIG. 3 is a diagram showing a routing table of the first communication device of the communication system according to Embodiment 1.
  • FIG. 6 is a diagram showing a routing table of the second communication device of the communication system according to Embodiment 1.
  • FIG. 6 is a diagram showing a routing table of a third communication device of the communication system according to Embodiment 1.
  • FIG. 6 is a diagram showing a routing table of a fourth communication device of the communication system in the first embodiment.
  • FIG. FIG. 10 is a diagram showing a path when the first communication device of the communication system in the first embodiment transmits data clockwise to the third communication device.
  • FIG. 10 is a diagram illustrating a path when the first communication device of the communication system according to the first embodiment transmits data counterclockwise to the third communication device.
  • 3 is a hardware configuration diagram of a first communication device of the communication system according to Embodiment 1.
  • FIG. 6 is a configuration diagram of a communication system according to Embodiment 2.
  • FIG. 6 is a diagram showing an IP packet used in the communication system according to Embodiment 2.
  • FIG. 10 is a flowchart for explaining processing when data is transmitted in the application layer of the first communication device of the communication system in the second embodiment.
  • 10 is a flowchart for explaining processing when data is received and processing when data is relayed in the application layer of the first communication device of the communication system according to the second embodiment.
  • FIG. 10 is a diagram illustrating a first example of communication abnormality in the first communication path of the communication system in the third embodiment.
  • FIG. 10 is a diagram illustrating a second example of communication abnormality in the first communication path of the communication system in the third embodiment.
  • FIG. 15 is a diagram illustrating a case where the first communication device of the communication system according to Embodiment 3 is in an offline state.
  • FIG. 10 is a diagram illustrating an example of communication abnormality in the first communication path of the communication system in the fourth embodiment. It is a block diagram of the elevator system with which the communication system in Embodiment 5 is applied.
  • FIG. 1 is a configuration diagram of a communication system according to the first embodiment.
  • the first communication device 1 includes a one-side network interface 1a and another-side network interface 1b.
  • the one-side network interface 1a is an interface for clockwise transmission and counterclockwise reception.
  • the other-side network interface 1b is an interface for counterclockwise transmission and clockwise reception.
  • the first IP address belonging to the first IP network address is assigned to the one-side network interface 1a.
  • a second IP address belonging to a second IP network address different from the first IP network address is assigned to the other-side network interface 1b.
  • the IP address of the one-side network interface 1a is 192.168.1.1.
  • the IP address of the other side network interface 1b is 192.168.4.2.
  • the second communication device 2 includes a one-side network interface 2a and another-side network interface 2b.
  • the one-side network interface 2a is an interface for clockwise transmission and counterclockwise reception.
  • the other-side network interface 2b is an interface for counterclockwise transmission and clockwise reception.
  • the first IP address belonging to the first IP network address is assigned to the one-side network interface 2a.
  • a second IP address belonging to a second IP network address different from the first IP network address is assigned to the other-side network interface 2b.
  • the IP address of the one-side network interface 2a is 192.168.2.1.
  • the IP address of the other side network interface 2b is 192.168.1.2.
  • the third communication device 3 includes a one-side network interface 3a and another-side network interface 3b.
  • the one-side network interface 3a is an interface for clockwise transmission and counterclockwise reception.
  • the other-side network interface 3b is an interface for counterclockwise transmission and clockwise reception.
  • the first IP address belonging to the first IP network address is assigned to the one-side network interface 3a.
  • a second IP address belonging to a second IP network address different from the first IP network address is assigned to the other-side network interface 3b.
  • the IP address of the one-side network interface 3a is 192.168.3.1.
  • the IP address of the other side network interface 3b is 192.168.2.2.
  • the fourth communication device 4 includes a one-side network interface 4a and another-side network interface 4b.
  • the one-side network interface 4a is an interface for clockwise transmission and counterclockwise reception.
  • the other network interface 4b is an interface for counterclockwise transmission and clockwise reception.
  • the first IP address belonging to the first IP network address is assigned to the one-side network interface 4a.
  • a second IP address belonging to a second IP network address different from the first IP network address is assigned to the other-side network interface 4b.
  • the IP address of the one-side network interface 4a is 192.168.4.1.
  • the IP address of the other side network interface 4b is 192.168.3.2.
  • the IPv4 IP network address of the first communication path 5 is 192.168.1.0/24.
  • the IPv4 IP network address of the second communication path 6 is 192.168.2.0/24.
  • the IPv4 IP network address of the third communication path 7 is 192.168.3.0/24.
  • the IPv4 IP network address of the fourth communication path 8 is 192.168.4.0/24.
  • the IP network address for clockwise transmission of the first communication device 1 is 192.168.1.0/24 of the IP network address of the first communication path 5.
  • the IP network address of the first communication device 1 for counterclockwise transmission is 192.168.4.0/24 of the IP network address of the fourth communication path 8.
  • the IP network address for clockwise transmission of the second communication device 2 is 192.168.2.0/24 of the IP network address of the second communication path 6.
  • the IP network address for counterclockwise transmission of the second communication device 2 is 192.168.1.0/24 of the IP network address of the first communication path 5.
  • the IP network address for clockwise transmission of the third communication device 3 is 192.168.3.0/24 of the IP network address of the third communication path 7.
  • the IP network address for counterclockwise transmission of the third communication device 3 is 192.168.2.0/24 of the IP network address of the second communication path 6.
  • the IP network address for clockwise transmission of the fourth communication device 4 is 192.168.4.0/24 of the IP network address of the fourth communication path 8.
  • the IP network address of the fourth communication device 4 for counterclockwise transmission is 192.168.3.0/24 of the IP network address of the third communication path 7.
  • the first communication path 5, the second communication path 6, the third communication path 7, and the fourth communication path 8 are different IP networks.
  • the first communication path 5, the second communication path 6, the third communication path 7, and the fourth communication path 8 are different data links.
  • the 1st communication apparatus 1, the 2nd communication apparatus 2, the 3rd communication apparatus 3, and the 4th communication apparatus 4 do not operate
  • no loop occurs in the data link. Packets are relayed using layers higher than the IP layer.
  • the receiving communication device receives the same data twice.
  • the subsequent control is the same.
  • the receiving communication device receives the same data twice.
  • the subsequent control is the same.
  • the transmission unit of the control application uses the same communication device using UDP for the transport layer.
  • the data is transmitted twice to each of the clockwise IP address for counterclockwise reception and the IP address for counterclockwise reception.
  • the receiving unit of the control application allows the same data to be received twice at normal times.
  • the first communication device 1, the second communication device 2, the third communication device 3, and the fourth communication device 4 received the latest data based on the sequence number entered in the protocol of the upper application layer of UDP. In some cases, data may be imported.
  • FIG. 2 is a diagram showing a routing table of the first communication device of the communication system in the first embodiment.
  • FIG. 3 is a diagram showing a routing table of the second communication device of the communication system in the first embodiment.
  • FIG. 4 is a diagram showing a routing table of the third communication device of the communication system in the first embodiment.
  • FIG. 5 is a diagram showing a routing table of the fourth communication device of the communication system in the first embodiment.
  • Network is IP address information that is the final destination.
  • the “net mask” is information on the network part and the host part of the “network”.
  • Gateway is information of an IP address that is the first destination.
  • Interface is information on the IP address of the interface used during the communication.
  • FIG. 6 is a diagram illustrating a path when the first communication device of the communication system according to the first embodiment transmits data clockwise to the third communication device.
  • the IP address for clockwise reception of the third communication device 3 is 192.168.2.2.
  • the first communication device 1 sets the IP address as the destination IP address.
  • the first communication device 1 transmits data according to the routing table of FIG. Specifically, the first communication device 1 is configured such that the IP address of the 192.168.1.1 one-side network interface 1a is changed to the second communication device 192.168.1.2-side network interface 2b of the 192.168.1.2 IP address. Send data to.
  • the second communication device 2 grasps that the destination IP address of the received data is 192.168.2.2.
  • the second communication device 2 transmits data according to the routing table of FIG. Specifically, the second communication device 2 has an IP address of 192.168.2.1 from one side network interface 2a to an IP address of 192.168.2.2 on the other side network interface 3 of the third communication device 3. Data is transmitted to 3b.
  • the third communication device 3 recognizes that the destination IP address is its own IP address. At this time, the third communication device 3 takes the data into the application layer, assuming that the data is addressed to itself.
  • FIG. 7 is a diagram illustrating a path when the first communication device of the communication system according to Embodiment 1 transmits data counterclockwise to the second communication device.
  • the IP address for counterclockwise reception of the second communication device 2 is 192.168.2.1.
  • the first communication device 1 sets the IP address as the destination IP address.
  • the first communication device 1 transmits data according to the routing table of FIG. Specifically, the first communication device 1 is connected to the one-side network interface of the fourth communication device 4 having the IP address of 192.168.4.1 from the other-side network interface 1b of the 192.168.4.2 IP address. Data is transmitted to 4a.
  • the fourth communication device 4 grasps
  • the fourth communication device 4 transmits data according to the routing table of FIG. Specifically, the fourth communication device 4 is connected to the one side network interface of the third communication device 3 whose IP address is 192.168.3.1 from the other side network interface 4b of the 192.168.3.2 IP address. Data is transmitted to 3a.
  • the third communication device 3 grasps that the destination IP address of the received data is 192.168.2.1.
  • the third communication device 3 transmits data according to the routing table of FIG. Specifically, the third communication device 3 is connected to the one-side network interface of the second communication device 2 whose IP address is 192.168.2.1 from the other-side network interface 3b whose IP address is 192.168.2.2. Send data to 2a.
  • the second communication device 2 grasps that the destination IP address is its own IP address. At this time, the second communication device 2 takes the data into the application layer, assuming that the data is addressed to itself.
  • the IP routing setting and application processing are performed.
  • data can be transmitted simultaneously in both directions in the ring network.
  • hardware development costs, software development costs, manufacturing costs, development periods, ease of parts procurement, long-term supply of parts, protocol stacks and OS support to support them Ease of use and long-term support can be improved.
  • adjacent communication devices are different IP networks having different IP network addresses.
  • the data when data is transmitted by IP broadcast in which the host part of the destination IP address is all 1, the data reaches the adjacent communication device. For example, when data is transmitted by IP broadcast of 192.168.1.255, the data reaches an adjacent communication device. The data is not relayed beyond that point.
  • the IP address of 192.168.1.1 of the one-side network interface 1a for clockwise transmission is set as the source IP address, and the fourth on the left
  • the destination IP address may be 192.168.3.2 which is the IP address of the other side network interface 4b for clockwise reception of the communication device 4.
  • the packet at this time reaches the fourth communication device 4 clockwise from the first communication device 1.
  • the second communication device 2 and the third communication device 3 on the way may take the packet into their application layers.
  • the second communication device 2 and the third communication device 3 may import the packet into their application layers using Raw Socket.
  • communication can be performed by at least one of unicast and broadcast.
  • normal IP communication may be used for maintenance, content delivery, and the like.
  • the source IP address is set to 192.168.1.1 and the destination IP address is set to 192.168 .. It may be 2.2.
  • the packet reaches the third communication device 3 clockwise from the first communication device 1.
  • the third communication device 3 communicates with the first communication device 1 by TCP / IP
  • the source IP address is set to 192.168.2.2
  • the destination IP address is set to 192.168.1.1. do it.
  • the packet reaches the first communication device 1 counterclockwise from the third communication device 3.
  • bidirectional communication can be performed via the first communication path 5 and the second communication path 6.
  • bidirectional communication can be maintained by switching the communication path to the third communication path 7 and the fourth communication path 8. Specifically, if the source IP address of the first communication device 1 is 192.168.4.2 and the destination IP address is 192.168.3.1, the first communication device 1 is the third communication device. 3 can communicate with TCP / IP.
  • FIG. 8 is a hardware configuration diagram of the first communication device of the communication system according to the first embodiment.
  • Each function of the first communication device 1 can be realized by a processing circuit.
  • the processing circuit includes at least one processor 9a and at least one memory 9b.
  • the processing circuit comprises at least one dedicated hardware 10.
  • each function of the first communication device 1 is realized by software, firmware, or a combination of software and firmware. At least one of software and firmware is described as a program. At least one of software and firmware is stored in at least one memory 9b. At least one processor 9a implements each function of the first communication device 1 by reading and executing a program stored in at least one memory 9b.
  • the at least one processor 9a is also referred to as a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, and a DSP.
  • the at least one memory 9b is a nonvolatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, or EEPROM, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD, or the like.
  • the processing circuit comprises at least one dedicated hardware 10
  • the processing circuit is implemented, for example, as a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.
  • each function of the first communication device 1 is realized by a processing circuit.
  • each function of the first communication device 1 is collectively realized by a processing circuit.
  • the functions of the first communication device 1 may be realized by the dedicated hardware 10, and the other part may be realized by software or firmware.
  • the function for transmitting the gate signal is realized by a processing circuit as the dedicated hardware 10, and for the functions other than the function for transmitting the gate signal, at least one processor 9a is stored in at least one memory 9b. May be realized by reading out and executing.
  • the processing circuit realizes each function of the first communication device 1 by the hardware 10, software, firmware, or a combination thereof.
  • each function of the second communication device 2 can also be realized by the processing circuit of the first communication device 1.
  • Each function of the third communication device 3 can also be realized by the processing circuit of the first communication device 1.
  • Each function of the fourth communication device 4 can also be realized by the processing circuit of the first communication device 1.
  • FIG. FIG. 9 is a configuration diagram of a communication system according to the second embodiment.
  • symbol is attached
  • the first communication device 1 uses only the row in which “gateway” is “on link” in the routing table of FIG.
  • the second communication device 2 uses only the row in which “gateway” is “on link” in the routing table of FIG. 3.
  • the third communication device 3 uses only the row in which “gateway” is “on link” in the routing table of FIG. 4.
  • the fourth communication device 4 uses only the row in which “gateway” is “on link” in the routing table of FIG. 5.
  • the data reaches only the interface on its own side of the adjacent communication device as the network layer. do not do. Therefore, the first communication device 1, the second communication device 2, the third communication device 3, and the fourth communication device 4 realize a bidirectional communication ring-type communication system by relaying data in the application layer. .
  • FIG. 10 is a diagram showing IP packets used in the communication system according to the second embodiment.
  • IP header As shown in FIG. 10, in the IP packet, “IP header”, “UDP header”, “destination device ID”, “source device ID”, and “data” are associated with each other.
  • IP header is information handled in the IP layer.
  • UDP header is information handled in the UDP layer.
  • transmission destination device ID is information handled in the UDP layer.
  • transmission source device ID is information handled in the application layer.
  • FIG. 11 is a flowchart for explaining processing when data is transmitted in the application layer of the first communication device of the communication system according to the second embodiment.
  • the first communication device 1 uses the socket API as it is.
  • the first communication device 1 creates a socket for clockwise transmission and a socket for counterclockwise transmission.
  • the socket for clockwise transmission is an IP address for clockwise reception of an adjacent communication device in the clockwise direction.
  • the socket for counterclockwise transmission is an IP address for counterclockwise reception of an adjacent communication device when counterclockwise.
  • step S2 the first communication device 1 waits for a request for transmission of an IP packet. Thereafter, the first communication device 1 performs the process of step S3.
  • step S3 the first communication device 1 transmits the same data to the socket for clockwise transmission and the socket for counterclockwise transmission. Thereafter, the first communication device 1 performs the process of step S2.
  • the second communication device 2 also transmits data in the application layer in the same manner as the first communication device 1. Similarly to the first communication device 1, the third communication device 3 transmits data in the application layer. Similarly to the first communication device 1, the fourth communication device 4 transmits data in the application layer.
  • FIG. 12 is a flowchart for explaining a process when receiving data and a process when relaying data in the application layer of the first communication device of the communication system according to the second embodiment.
  • step S11 the first communication device 1 creates a socket for clockwise transmission and a socket for counterclockwise transmission, as in step S1 of FIG. Thereafter, the first communication device 1 performs the process of step S12. In step S12, the first communication device 1 waits for reception of an IP packet.
  • step S13 the first communication device 1 determines whether or not the “destination device ID” of the received IP packet is its own ID.
  • step S13 When the “destination device ID” of the IP packet is its own ID in step S13, the first communication device 1 performs the process of step S14. In step S ⁇ b> 14, the first communication device 1 performs “data” reception processing of the IP packet. Thereafter, the first communication device 1 performs the process of step S12.
  • step S15 If the “destination device ID” of the IP packet is not its own ID in step S13, the first communication device 1 performs the process of step S15. In step S ⁇ b> 15, the first communication device 1 transmits “transmission destination device ID”, “transmission source device ID”, and “data” to the socket on the opposite side of the received socket. Thereafter, the first communication device 1 performs the process of step S12.
  • step S15 the first communication device 1 performs these processes in the application layer.
  • the first communication device 1 uses the IP address of itself or an adjacent communication device in the IP layer.
  • the second communication device 2 also receives data at the application layer in the same manner as the first communication device 1. Similar to the first communication device 1, the second communication device 2 also relays data at the application layer. Similarly to the first communication device 1, the third communication device 3 receives data at the application layer. Similarly to the first communication device 1, the third communication device 3 also relays data at the application layer. Similarly to the first communication device 1, the fourth communication device 4 also receives data at the application layer. Similarly to the first communication device 1, the fourth communication device 4 also relays data at the application layer.
  • the “IP header” of the IP packet is changed every time it is transferred by the communication device.
  • the first transmission source communication device is a communication device corresponding to the “transmission source device ID”.
  • the final destination communication device is a communication device corresponding to the “destination device ID”.
  • FIG. 13 is a diagram illustrating a path when the first communication device of the communication system according to the second embodiment transmits data clockwise to the third communication device.
  • the first communication device 1 sets the “destination device ID” of the IP packet to “103”.
  • the first communication device 1 sets the “transmission source device ID” of the IP packet to “101”.
  • the first communication device 1 transmits data from the one-side network interface 1a having an IP address of 192.168.1.1 to the other-side network interface 2b of the second communication device 2 having an IP address of 192.168.1.2. To do.
  • the second communication device 2 recognizes that the IP packet is an IP packet addressed to itself in the IP layer. For this reason, the second communication device 2 receives the IP packet.
  • the second communication device 2 passes the “destination device ID”, “transmission source device ID”, and “data” to the application layer as a UDP packet.
  • the second communication device 2 recognizes that the “destination device ID” is not its own ID in the application layer.
  • the second communication device 2 is connected to the third communication device 3 having the IP address of 192.168.2.2 from the one-side network interface 2a of the IP address of 192.168.2.1 based on FIG.
  • the IP packet is transmitted to the side network interface 3b.
  • the second communication device 2 changes the “IP header” without changing the “transmission destination device ID”, “transmission source device ID”, and “data”.
  • the third communication device 3 recognizes that the IP packet is an IP packet addressed to itself in the IP layer. For this reason, the third communication device 3 receives the IP packet.
  • the third communication device 3 passes “transmission destination device ID”, “transmission source device ID”, and “data” to the application layer as a UDP packet.
  • the third communication device 3 recognizes that the “destination device ID” is its own ID in the application layer. Therefore, the third communication device 3 performs “data” reception processing in the application layer.
  • FIG. 14 is a diagram illustrating a path when the first communication device of the communication system according to Embodiment 2 transmits data counterclockwise to the third communication device.
  • the first communication device 1 sets the “destination device ID” of the IP packet to “103”.
  • the first communication device 1 sets the “transmission source device ID” of the IP packet to “101”.
  • the first communication device 1 transmits data from the other-side network interface 1b with an IP address of 192.168.4.2 to the one-side network interface 4a of the fourth communication device 4 with an IP address of 192.168.4.1. To do.
  • the 4th communication apparatus 4 grasps
  • the fourth communication device 4 passes “transmission destination device ID”, “transmission source device ID”, and “data” as a UDP packet to the application layer.
  • the fourth communication device 4 recognizes that the “destination device ID” is not its own ID in the application layer.
  • the fourth communication device 4 is connected to the 192 of the third communication device 3 whose IP address is 192.168.3.1 from the other side network interface 4b of 192.168.3.2 based on FIG. .168.3.1 Send an IP packet to the one-side network interface 3a.
  • the second communication device 2 changes the “IP header” without changing the “transmission destination device ID”, “transmission source device ID”, and “data”.
  • the third communication device 3 recognizes that the IP packet is an IP packet addressed to itself in the IP layer. For this reason, the third communication device 3 receives the IP packet.
  • the third communication device 3 passes “transmission destination device ID”, “transmission source device ID”, and “data” to the application layer as a UDP packet.
  • the third communication device 3 recognizes that the “destination device ID” is its own ID in the application layer. Therefore, the third communication device 3 performs “data” reception processing in the application layer.
  • communication is performed only through a directly connected network having the same network address. For this reason, IP packets can be transmitted simultaneously in both directions regardless of the IP routing of each communication device.
  • the communication system of the second embodiment can operate even if IP routing other than the network on the directly connected data link is added.
  • automatic routing may be performed using a Routing Information Protocol such as RFC 1058, RFC 2453, or the like. In this case, it is IP reachable for a network that is not directly connected. However, simultaneous transmission in both directions is not performed.
  • the communication using the automatic routing is used for communication such as diagnosis and maintenance associated with control, or used for communication of other applications.
  • the information for identifying the source communication device and the information for identifying the destination communication device only need to correspond to the transport layer and higher layers.
  • FIG. 15 is a diagram illustrating a first example of communication abnormality in the first communication path of the communication system according to the third embodiment.
  • symbol is attached
  • the first communication path 5 has a communication abnormality only in the clockwise direction due to disconnection or the like.
  • the IP addresses of the IP packets that can be received counterclockwise are 192.168.1.2 of the second communication device 2 and 192.168.8.4 of the first communication device 1. .2 and 192.168.3.2 of the fourth communication device 4. In the counterclockwise direction, all expected IP packets arrive. For this reason, there is no particular problem.
  • the source IP address of the IP packet that can be received clockwise is only 192.168.2.1 of the second communication device 2.
  • an IP packet from 192.168.2.1 of the second communication device 2 is received, but an IP packet from 192.168.1.1 of the first communication device 1 is not received.
  • the 3rd communication apparatus 3 grasps
  • FIG. 16 is a diagram illustrating a second example of communication abnormality in the first communication path of the communication system according to the third embodiment.
  • Packets that can be received clockwise in the third communication device 3 are the same as those in FIG.
  • the source IP address of the IP packet that can be received counterclockwise is either 192.168.3.2 of the fourth communication device 4 or 192.168.4.2 of the first communication device 1. is there. In the counterclockwise direction, an IP packet from 192.168.4.2 of the first communication device 1 is received, but an IP packet from 192.168.1.2 of the second communication device 2 is not received. For this reason, the third communication device 3 grasps that the counterclockwise communication is not established between the first communication device 1 and the second communication device 2.
  • FIG. 17 is a diagram illustrating a case where the first communication device of the communication system according to Embodiment 3 is in an offline state.
  • the source IP address of the IP packet that can be received counterclockwise is only 192.168.3.2 of the fourth device.
  • the source IP address of the IP packet that can be received clockwise is only 192.168.2.1 of the second communication device 2.
  • the IP packet from the first communication device 1 is not received both counterclockwise and clockwise. In this case, the third communication device 3 grasps that the first communication device 1 is in an offline state.
  • FIG. 18 is a diagram illustrating a table used when the third communication device of the communication system according to Embodiment 3 estimates a communication abnormality location.
  • FIG. 19 is a flowchart for explaining an outline of processing when the third communication device of the communication system according to the third embodiment determines a communication abnormality part.
  • FIG. 20 is a flowchart for explaining a process when the third communication device of the communication system according to the third embodiment estimates a communication abnormality part in the counterclockwise direction and the clockwise direction.
  • FIG. 21 is a flowchart for explaining processing when the third communication device of the communication system according to the third embodiment comprehensively determines communication abnormality locations.
  • Search order is information on the order of searching for communication anomalies.
  • Source IP address is information of a source IP address.
  • Communication path and “communication device” are information of a location where it is estimated that a communication error has occurred when a packet from the “source IP address” does not reach.
  • the third communication device 3 determines a communication abnormality part based on the flow of FIG.
  • step S21 the third communication device 3 performs a process of estimating a communication abnormality location using a table of “counterclockwise communication abnormality locations”. Thereafter, the third communication device 3 performs the process of step S22.
  • step S ⁇ b> 22 the third communication device 3 performs a process for estimating a communication abnormality location using a table of “clockwise communication abnormality locations”. Thereafter, the third communication device 3 performs the process of step S23.
  • step S23 the third communication device 3 comprehensively determines the communication abnormality location based on the estimation result based on the “counterclockwise communication abnormality location” table and the estimation result based on the table “clockwise communication abnormality location”. To do. Thereafter, the third communication device 3 ends the process.
  • the third communication device 3 uses the “counterclockwise communication abnormality location” table and the communication abnormality location estimation process and the “clockwise communication abnormality location” table. Estimate the location of the abnormal communication.
  • step S31 the third communication device 3 sets “search order” i to 1. Thereafter, the third communication device 3 performs the process of step S32. In step S32, the third communication device 3 determines whether or not the “search order” i exceeds the last value.
  • step S32 the third communication device 3 performs the process of step S33.
  • step S33 the third communication device 3 determines whether or not an IP packet from the “source IP address” in the “search order” i has been received.
  • step S33 When the IP packet from the “source IP address” of “search order” i is received in step S33, the third communication device 3 performs the process of step S34. In step S34, the third communication device 3 increments “search order” i. Thereafter, the third communication device 3 performs the process of step S32.
  • step S32 If the “search order” i exceeds the last value in step S32, the third communication device 3 performs the process of step S35. In step S35, the third communication device 3 estimates that no communication abnormality has occurred. Thereafter, the third communication device 3 ends the process.
  • step S36 the third communication device 3 estimates that a communication abnormality has occurred in at least one of the “communication path” and the “communication device” corresponding to the “search order” i in the rotating direction during the search. Thereafter, the third communication device 3 ends the process.
  • the third communication device 3 comprehensively performs communication abnormality point determination processing based on the flow of FIG.
  • step S41 the third communication device 3 determines whether or not the occurrence of a communication abnormality is estimated.
  • step S41 If the occurrence of the communication abnormality is not estimated as “counterclockwise” or “clockwise” in step S41, the third communication device 3 performs the process of step S42. In step S42, the third communication device 3 determines that no communication abnormality has occurred.
  • step S41 If the occurrence of the communication abnormality is estimated as “counterclockwise” or “clockwise” in step S41, the third communication device 3 performs the process of step S43. In step S43, the third communication device 3 determines that a communication abnormality in the rotating direction has occurred in at least one of the estimated “communication path” and “communication device”.
  • step S41 If the occurrence of communication abnormality is estimated as “counterclockwise” and “clockwise” in step S41, the third communication device 3 performs the process of step S44. In step S44, the third communication device 3 determines whether or not the “communication device” estimated to be abnormal in communication “clockwise” and “clockwise” matches.
  • step S44 If the “communication device” estimated to be communication abnormality in “counterclockwise” and “clockwise” in step S44 matches, the third communication device 3 performs the process of step S45. In step S45, the third communication device 3 determines that the “communication device” is offline.
  • step S45 If the “communication device” estimated to be communication abnormality in “counterclockwise” and “clockwise” in step S45 does not match, the third communication device 3 performs the process of step S46. In step S ⁇ b> 46, the third communication device 3 determines whether the “communication path” estimated to be abnormal in communication is “clockwise” and “clockwise”.
  • step S46 If the “communication path” estimated to be abnormal in communication “clockwise” and “clockwise” in step S46 matches, the third communication device 3 performs the process of step S47. In step S ⁇ b> 47, the third communication device 3 determines that there is a communication abnormality when the “communication path” is “counterclockwise” and “clockwise”.
  • step S46 If the “communication path” estimated to be abnormal in communication “clockwise” and “clockwise” in step S46 does not match, the third communication device 3 performs the process of step S48. In step S47, the third communication device 3 determines that communication abnormality has occurred at two or more locations.
  • the third communication device 3 identifies a communication abnormality location based on the monitoring result of the IP packet. For this reason, in the third communication device 3, it is possible to estimate a communication abnormality location in all the communication devices without using a special diagnostic protocol.
  • the first communication device 1 also identifies a communication abnormality location based on the monitoring result of the IP packet, similarly to the third communication device 3.
  • the second communication device 2 also identifies a communication abnormality location based on the monitoring result of the IP packet.
  • the fourth communication device 4 also identifies a communication abnormality location based on the monitoring result of the IP packet. For this reason, also in the 1st communication apparatus 1, the 2nd communication apparatus 2, and the 4th communication apparatus 4, a communication abnormality location can be estimated in all the communication apparatuses, without using a special diagnostic protocol.
  • FIG. FIG. 22 is a diagram illustrating an example of communication abnormality in the first communication path of the communication system in the fourth embodiment.
  • symbol is attached
  • the first communication device 1 is a main communication device.
  • the first communication device 1 can communicate with the second communication device 2, the third communication device 3, and the fourth communication device 4.
  • the second communication device 2, the third communication device 3, and the fourth communication device 4 are slave communication devices.
  • the second communication device 2, the third communication device 3, and the fourth communication device 4 can communicate only with the first communication device 1.
  • the third communication device 3 does not receive the counterclockwise IP packet from the second communication device 2 both in the normal time and in the abnormal time. For this reason, the third communication device 3 does not determine a communication abnormality that has occurred on the counterclockwise route from the second communication device 2 to the first communication device 1.
  • the first communication device 1 communicates with all of the second communication device 2, the third communication device 3, and the fourth communication device 4. For this reason, as in the third embodiment, the first communication device 1 determines a communication abnormality.
  • the first communication device 1 can determine a communication abnormality. For this reason, if it is sufficient that the first communication device 1 can determine the communication abnormality, a function for determining the communication abnormality may be added only to the first communication device 1. As a result, the functions of the second communication device 2, the third communication device 3, and the fourth communication device can be simplified.
  • the first communication device 1 uses the second communication device 2, the third communication device 3, and the fourth Data indicating the communication abnormality determination result may be transmitted or broadcast to the communication device 4.
  • the second communication device 2 when the first communication device 1 is offline, data indicating an abnormality determination result is not transmitted. At this time, the second communication device 2, the third communication device 3, and the fourth communication device 4 do not receive the IP packet from the first communication device 1 either counterclockwise or clockwise, so that the first communication device 1 is offline. What is necessary is just to determine that it is.
  • the first communication device 1 transmits an IP packet by unicast to the second communication device 2, the third communication device 3, and the fourth communication device 4, the second communication device 2 and the third communication are normally operated.
  • the device 3 and the fourth communication device 4 receive the IP packet.
  • the second communication device 2, the third communication device 3, and the fourth communication device 4 can determine a communication abnormality as in the third embodiment.
  • the second communication device 2, the third communication device 3, and the fourth communication device 4 transmit IP packets by broadcast to the first communication device 1, the second communication device 2 and the third communication device are normally operated. 3 and the fourth communication device 4 receive the IP packet. For this reason, the second communication device 2, the third communication device 3, and the fourth communication device 4 can determine a communication abnormality as in the third embodiment.
  • the first communication device 1, the second communication device 2, the third communication device 3, and the fourth communication device 4 transmit IP packets by broadcast
  • the first communication device 1 and the second communication device are normally operated. 2
  • the third communication device 3 and the fourth communication device 4 receive the IP packet. For this reason, the first communication device 1, the second communication device 2, the third communication device 3, and the fourth communication device 4 can determine a communication abnormality as in the third embodiment.
  • FIG. FIG. 23 is a configuration diagram of an elevator system to which the communication system according to the fifth embodiment is applied.
  • symbol is attached
  • the 2nd communication apparatus 2, the 3rd communication apparatus 3, and the 4th communication apparatus 4 are provided so that the hoisting machine etc. which were each provided in the hoistway of a different elevator can be controlled as an elevator control apparatus.
  • the second communication device 2 is provided so as to be able to communicate with the first car device 11 inside the hoistway.
  • the second communication device 2 is provided so as to be able to communicate with the landing device 14 on each floor.
  • the 3rd communication apparatus 3 is provided so that it can communicate with the 2nd in-car apparatus 12 inside the said hoistway.
  • the fourth communication device 4 is provided so as to be able to communicate with the third in-car device 13 inside the hoistway.
  • the first communication device 1 is provided as a group management device so that it can manage a plurality of elevators as a whole.
  • the 1st communication apparatus 1 is provided so that the car allocated to the call of the said landing can be determined based on the information from the landing apparatus 14 of each floor.
  • the second communication device 2 transmits information on the call status of each floor to the second communication device 2.
  • the second communication device 2, the third communication device 3, and the fourth communication device 4 transmit information on the current position, the traveling direction, and the planned stoppage of each car to the first communication device 1.
  • the first communication device 1 transmits information on the floor to which the car should stop to the second communication device 2, the third communication device 3, and the fourth communication device 4.
  • communication can be performed using a general Ethernet (registered trademark) and a general IP.
  • the maintenance period is 20 to 30 years.
  • periodic inspections are performed with the elevator partially stopped.
  • the apparatus can be partially stopped for maintenance.
  • the first communication device 1 and the landing device 14 have no redundancy. For this reason, if at least one of the 1st communication apparatus 1 and the 2nd communication apparatus 2 is stopped, the function of an elevator system will fall significantly.
  • a plurality of communication devices equivalent to the first communication device 1 are provided, a plurality of communication paths to the landing device 14 are provided, and the third communication device 3 and the fourth communication device 4 are provided. And connect to.
  • the communication system according to the present invention can be used for a system that transmits data bidirectionally in a ring network while using Ethernet (registered trademark) and IP.

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

Abstract

L'invention concerne un système de communication pouvant transmettre des données de manière bidirectionnelle dans un réseau en anneau même lorsque Ethernet (marque déposée) et le protocole Internet (IP) sont utilisés. Le système de communication comprend : une pluralité de dispositifs de communication comportant une interface de réseau du premier côté à laquelle une première adresse IP faisant partie d'une première adresse de réseau IP a été attribuée, ainsi qu'une interface de réseau de l'autre côté à laquelle une seconde adresse IP faisant partie d'une seconde adresse de réseau IP différente de la première adresse de réseau IP a été attribuée ; et une pluralité de trajets de communication qui connectent la pluralité de dispositifs de communication en un anneau en connectant l'interface de réseau du premier côté d'un dispositif de communication de la pluralité de dispositifs de communication à l'interface de réseau de l'autre côté d'un autre dispositif de communication de la pluralité de dispositifs de communication, lesdits dispositifs étant adjacents.
PCT/JP2018/007530 2018-02-28 2018-02-28 Système de communication WO2019167175A1 (fr)

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JP2020503168A JPWO2019167175A1 (ja) 2018-02-28 2018-02-28 通信システム
PCT/JP2018/007530 WO2019167175A1 (fr) 2018-02-28 2018-02-28 Système de communication
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000013436A (ja) * 1998-06-19 2000-01-14 Nec Corp Ｉｐアドレス自動生成方法
US20030223749A1 (en) * 2002-05-31 2003-12-04 David Funk Optical network management
JP2009171398A (ja) * 2008-01-18 2009-07-30 Mitsubishi Electric Corp リングネットワーク装置、通信方法およびプログラム
JP2016005022A (ja) * 2014-06-13 2016-01-12 株式会社東芝 ループ型保護リレーシステム
JP2016123203A (ja) * 2014-12-25 2016-07-07 株式会社東芝 保護リレーシステム

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100596356C (zh) * 2006-09-06 2010-03-31 杭州华三通信技术有限公司 网络节点及其所在以太环网的故障恢复方法
CN101141366A (zh) * 2006-09-07 2008-03-12 华为技术有限公司 一种在环状以太网中避免数据环路的方法
CN101001192B (zh) * 2007-01-17 2010-04-21 华为技术有限公司 一种环网链路保护的方法、系统及设备
CN101127674B (zh) * 2007-09-25 2011-11-30 中兴通讯股份有限公司 以太环网系统传输节点初始化方法
CN101272352B (zh) * 2008-05-20 2012-01-04 杭州华三通信技术有限公司 环网路由方法及环网节点

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000013436A (ja) * 1998-06-19 2000-01-14 Nec Corp Ｉｐアドレス自動生成方法
US20030223749A1 (en) * 2002-05-31 2003-12-04 David Funk Optical network management
JP2009171398A (ja) * 2008-01-18 2009-07-30 Mitsubishi Electric Corp リングネットワーク装置、通信方法およびプログラム
JP2016005022A (ja) * 2014-06-13 2016-01-12 株式会社東芝 ループ型保護リレーシステム
JP2016123203A (ja) * 2014-12-25 2016-07-07 株式会社東芝 保護リレーシステム

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