WO2017203651A1 - Procédé de transmission de données à périodes fixes - Google Patents

Procédé de transmission de données à périodes fixes Download PDF

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Publication number
WO2017203651A1
WO2017203651A1 PCT/JP2016/065551 JP2016065551W WO2017203651A1 WO 2017203651 A1 WO2017203651 A1 WO 2017203651A1 JP 2016065551 W JP2016065551 W JP 2016065551W WO 2017203651 A1 WO2017203651 A1 WO 2017203651A1
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WO
WIPO (PCT)
Prior art keywords
terminal
data
shared memory
received
reception state
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Application number
PCT/JP2016/065551
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English (en)
Japanese (ja)
Inventor
真鍋　勝重
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2016566841A priority Critical patent/JP6207768B1/ja
Priority to PCT/JP2016/065551 priority patent/WO2017203651A1/fr
Publication of WO2017203651A1 publication Critical patent/WO2017203651A1/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]

Definitions

  • the present invention relates to a fixed-cycle data transmission method using a shared memory on a network.
  • a shared memory for storing information shared between a plurality of terminals connected to the network, and the shared memory data of the own terminal is stored in other ways.
  • the terminal receiving the shared memory data updates the data in the area allocated to the transmission source terminal in its shared memory based on the shared memory data.
  • the source terminal When the own terminal transmits shared memory data at regular intervals, the source terminal has the same value when there is no change in the shared memory data of the own terminal, and the data pattern in which the value is changed when there is a change Upon receiving the data including the shared memory data, the terminal that has added the ID and received the data transmits a delivery confirmation response including the data pattern ID of the data to the transmission source terminal, and has received the delivery confirmation response. The terminal stops transmission of shared memory data corresponding to the same data pattern ID. (See Patent Document 1)
  • a transmission confirmation response may be received from a receiving terminal in order to stop transmission of shared memory data transmitted from a transmitting terminal at a fixed period. This is necessary, and when the delivery confirmation response does not reach the transmission source for some reason, the transmission source continues to transmit the periodic data, and thus there is a problem that the network bandwidth is continuously consumed.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fixed-cycle data transmission method that can reduce network bandwidth consumption.
  • the fixed-cycle data transmission method is composed of a plurality of terminals connected to a network, and each of the terminals has a shared memory for storing information shared between the terminals.
  • the own terminal data which is data stored in the area allocated to the terminal, is transmitted as shared memory data to other terminals.
  • the terminal that has received the shared memory data shares its own memory based on the shared memory data.
  • the terminal predetermines a reception state of the shared memory data from another terminal and the changed shared memory data of the own terminal. It transmits in the time period of this.
  • the transmission source terminal when transmitting fixed-cycle data, transmits only the reception state if there is no change in its own terminal data, and if there is a change, the reception is received. Since the state and the own terminal data are transmitted, it is not necessary to continue to transmit the own terminal data until the delivery confirmation response is received as in the above-mentioned Patent Document 1, and accordingly, the consumption of the network bandwidth can be reduced. There is an effect.
  • FIG. 1 is a schematic configuration diagram of a fixed-cycle transmission system that is an object of the present invention.
  • terminals 1-1 to 1-5 are connected to a network 2. Further, the terminals 1-1 to 1-5 include an application processing unit 11, a periodic data transmission processing unit 12, and a protocol processing unit 13.
  • the fixed-cycle data transmission processing unit 12 includes a shared memory 14 and a reception state memory 15 inside. The content of the shared memory 14 is required to be identical between all terminals connected to the network 2. The content of the reception state memory 15 stores the reception state of shared memory data received from other terminals.
  • the protocol processing unit 13 performs general-purpose protocol processing such as UDP (User Datagram Protocol), IP (Internet Protocol), and Ethernet (registered trademark). Similar to the general protocol processing unit, the protocol processing unit 13 mainly performs processing below the IP layer.
  • the fixed-cycle data transmission processing unit 12 performs processing related to fixed-cycle data transmission, writes to the shared memory 14 holding data shared by the fixed-cycle data transmission, and reads shared memory data received from other terminals. Operations such as storing the reception state in the reception state memory 15 are performed.
  • the application processing unit 11 refers to the contents of the shared memory 14 and performs an application operation.
  • FIG. 2 is a diagram illustrating the configuration of the shared memory 14 and the reception state memory 15, the data stored in the shared memory 14, and the transmission method of the data stored in the reception state memory 15.
  • the shared memory 14 and the reception status memory 15 are allocated areas for each terminal connected to the network 2.
  • -1 is compared, and if there is a change, the local terminal data is copied to the previously transmitted local terminal data 14-1 (step a in the figure), and the transmission counter 14-2 is incremented. If there is no change, do nothing.
  • the transmission counter 14-2 is compared with the terminal #i reception state assigned to itself in the reception state memory 15, and if there is a change, the transmission counter 14-2 is copied to the terminal #i reception state (in the figure).
  • the protocol processing unit 13 reads the reception state memory 15 and the own terminal data 14-1 (changed) transmitted previously (steps c1 and c2 in the figure), and uses the read data as fixed-cycle data transmission data. Add a general-purpose protocol header such as (registered trademark) or UDP / IP and send it. If there is no change, only the reception state memory 15 is read, and the read data is transmitted as fixed-cycle data transmission data with a general-purpose protocol header such as Ethernet (registered trademark) or UDP / IP added.
  • FIG. 3 is a diagram showing the configuration of the shared memory 14 and the reception state memory 15, the data stored in the shared memory 14, and the method for receiving the data stored in the reception state memory 15.
  • the shared memory 14 and the reception status memory 15 are allocated areas for each terminal connected to the network 2.
  • the receiving terminal receives the periodic data transmission data as a general protocol such as Ethernet (registered trademark) or UDP / IP, the receiving terminal identifies the transmission source terminal as terminal #i from the general protocol header information.
  • the terminal #i reception state is read from the reception state in the fixed-cycle data transmission data, compared with the terminal #i reception state assigned to the reception state memory 15, and if there is a change, it is assigned to the reception state memory 15
  • the read state is copied to the terminal #i state (step d in the figure), and the own terminal data in the periodic data transmission data is read and copied to the terminal #i area allocated to the shared memory 14 (in the figure).
  • Step e) If there is no change, only the read state is copied to the terminal #i state assigned to the reception state memory 15 (step d in the figure).
  • FIG. 4 is a chart showing an example of data transmission by the periodic data transmission method.
  • the transmission source terminal #i transmits the reception state and the own terminal data because the own terminal data is changed in the predetermined cycle time # S1 (step S11).
  • the periodic data transmission processing unit 12 performs transmission source terminal #i based on the received data.
  • the terminal #i reception state in the reception state memory 15 and the terminal #i area in the shared memory 14 are updated.
  • the source terminal #i performs (c1, c2) (step S12) at a predetermined cycle time # S2.
  • the receiving terminal receives the transmission data transmitted in step S12
  • the fixed-cycle data transmission processing unit 12 performs transmission source terminal #i based on the received data.
  • the terminal #i reception state of the reception state memory 15 corresponding to is updated.
  • the transmission source terminal performs the periodic data transmission transmission process at a predetermined periodic time #S, and the receiving terminal that has received the periodic data performs the periodic data transmission reception process.
  • the transmission source terminal when transmitting the periodic data, transmits only the reception state if there is no change in its own terminal data. Since the terminal data is transmitted, it is not necessary to continue transmitting the terminal data until the delivery confirmation response is received, so that the network bandwidth consumption can be reduced accordingly.
  • FIG. FIG. 5 is a diagram showing a periodic data transmission method according to Embodiment 2 of the present invention.
  • step S12 in FIG. 4 when there is no change in the own terminal data, only the reception state is transmitted, and when there is a change, the reception state and the own terminal data are transmitted.
  • the second embodiment as shown in FIG. 5, by providing the reception counter 15-1, the terminal #i reception state in the reception state memory 15 and the terminal #i other than the terminal #i are provided in step S12.
  • the reception counter # 15-1 is incremented (step f), and if it is longer than the predetermined cycle time #S, the local terminal data Even if it is determined that there is a terminal that has not been able to receive the received terminal data and there is no change in the own terminal data, the receiving state of the own terminal data 14-1 and the receiving state memory 15 that were transmitted last time Read (Step c1, c2), the read data as the periodic data, is obtained so as to retransmit by adding Ethernet (registered trademark) and general-purpose protocol header of UDP / IP or the like.
  • Ethernet registered trademark
  • the shared memory data of the own terminal is transmitted when it is determined that the shared memory data from the own terminal has not been received for a predetermined period of time.
  • reliability can be improved in ensuring identity among all terminals.
  • FIG. FIG. 6 is a diagram showing a periodic data transmission method according to Embodiment 3 of the present invention.
  • the reception terminal 15-1 in FIG. 5 reads out the reception status of the local terminal data 14-1 and the reception status memory 15 transmitted last time, even when the local terminal data is not changed.
  • the periodic time # for determining that the terminal data is not received separately from the periodic times #S 1, #S 2, #S 3. R1, # R2, and # R3 are provided.
  • the terminal #i reception state of the reception state memory 15 is compared with the reception state other than the terminal #i.
  • the reception counter # 15-1 the terminal data 1 sent last time is transmitted even if the terminal data is not changed if the period is longer than the predetermined period time #R. 4-1 and the reception status of the reception status memory 15 are read out, and the read data is retransmitted as fixed-cycle data with a general-purpose protocol header such as Ethernet (registered trademark) or UDP / IP added. .
  • a general-purpose protocol header such as Ethernet (registered trademark) or UDP / IP added.
  • a predetermined cycle time for determining that the shared memory data of the own terminal has been changed and a predetermined cycle time for determining that the shared memory data from the own terminal has not been received are provided. Therefore, it is possible to reduce network bandwidth consumption and improve reliability and responsivity for retransmission in ensuring identity among all terminals.
  • FIG. FIG. 7 is a diagram showing a periodic data transmission method according to Embodiment 4 of the present invention.
  • Embodiment 3 described above, even if there is no change in the local terminal data in step R11 in FIG. 6, the reception state of the local terminal data 14-1 and the reception state memory 15 transmitted last time is read, and the read data
  • a separation counter 16 and a post-leaving detection flag 16-1 are provided as shown in FIG. 7, and in steps S12 and R11 in FIG.
  • the terminal #i reception state in the reception state memory 15 and the reception state other than the terminal #i are compared, and if the counter value is different, the departure counter of the corresponding terminal assigned to the departure counter 16 is incremented, and the same If it is a value, the withdrawal counter of the corresponding terminal is reset.
  • the leaving counter 16 if there is a leaving counter value that is shorter than the predetermined cycle time #R, it is determined that the corresponding terminal is connected to the network 2, and the leaving retransmission flag 16 If -1 is significant and there is no departure counter value that has a short cycle time, it is ignored.
  • the reception counter # 15-1 is incremented, and if it is unintentional, it is reset so that unnecessary retransmission to the terminal that has left the network is reduced.
  • the bandwidth consumption can be reduced.
  • FIG. FIG. 8 is a diagram showing a periodic data transmission method according to Embodiment 5 of the present invention.
  • the own terminal data 14-1 and the reception state 15 that have been transmitted last time are read out and the read data is determined by the departure counter 16 in FIG. 7 even when there is no change in the own terminal data.
  • an entry counter 17 and an entry error detection flag 17-1 are further provided, and in steps S12 and R11 in FIG.
  • the terminal #i reception state in the reception state 15 is compared with the reception state other than the terminal #i. If the counter values are the same, the entry counter of the corresponding terminal assigned to the entry counter 17 is incremented, and a different counter value is obtained. If so, the entry counter of the corresponding terminal is reset.
  • the entry counter 17 if there is an entry counter value having a longer cycle time than the predetermined cycle time #R, it is determined that the corresponding terminal is connected to the network 2, and the entry retransmission flag 17 If -1 is significant and there is no entry counter value with a long cycle time, it is ignored. If either the leaving retransmission flag 16-1 or the entry retransmission flag 17-1 is significant, the reception counter # 15-1 is incremented, and if it is not intended, it is reset. By accurately grasping the terminals that have entered or exited, unnecessary retransmissions can be reduced, and network bandwidth consumption can be reduced.

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

Abstract

La présente invention a pour objet de réduire la consommation d'une bande de réseau lors d'un procédé de transmission de données à périodes fixes qui actualise une mémoire partagée parmi une pluralité de terminaux connectés à un réseau. La solution selon l'invention consiste en un procédé de transmission de données à périodes fixes qui actualise une mémoire partagée parmi des terminaux connectés à un réseau, tel que, lors de la transmission de données à périodes fixes, chacun des terminaux transmet l'état de réception de données de mémoire partagée provenant d'un autre terminal et de données de mémoire partagée modifiées du terminal propre à une période de temps prédéfinie.
PCT/JP2016/065551 2016-05-26 2016-05-26 Procédé de transmission de données à périodes fixes WO2017203651A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2016566841A JP6207768B1 (ja) 2016-05-26 2016-05-26 定周期データ伝送方法
PCT/JP2016/065551 WO2017203651A1 (fr) 2016-05-26 2016-05-26 Procédé de transmission de données à périodes fixes

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Application Number Priority Date Filing Date Title
PCT/JP2016/065551 WO2017203651A1 (fr) 2016-05-26 2016-05-26 Procédé de transmission de données à périodes fixes

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112788658A (zh) * 2019-11-11 2021-05-11 鹤壁天海电子信息系统有限公司 一种通信设备的共享数据方法、通信设备及存储介质
CN113938346A (zh) * 2021-09-29 2022-01-14 中车株洲电力机车有限公司 Mvb端口数据处理方法、mvb通信网络及轨道交通车辆

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06350615A (ja) * 1993-06-07 1994-12-22 Toshiba Corp サイクリック伝送システム
JP2002073584A (ja) * 2000-09-01 2002-03-12 Koyo Electronics Ind Co Ltd サイクリック自動通信による複数局メモリデータ共有システム
JP2002185566A (ja) * 2000-12-19 2002-06-28 Yaskawa Electric Corp 通信データ表示装置
JP2005303534A (ja) * 2004-04-08 2005-10-27 Mitsubishi Electric Corp サイクリック通信同期方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06350615A (ja) * 1993-06-07 1994-12-22 Toshiba Corp サイクリック伝送システム
JP2002073584A (ja) * 2000-09-01 2002-03-12 Koyo Electronics Ind Co Ltd サイクリック自動通信による複数局メモリデータ共有システム
JP2002185566A (ja) * 2000-12-19 2002-06-28 Yaskawa Electric Corp 通信データ表示装置
JP2005303534A (ja) * 2004-04-08 2005-10-27 Mitsubishi Electric Corp サイクリック通信同期方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112788658A (zh) * 2019-11-11 2021-05-11 鹤壁天海电子信息系统有限公司 一种通信设备的共享数据方法、通信设备及存储介质
CN113938346A (zh) * 2021-09-29 2022-01-14 中车株洲电力机车有限公司 Mvb端口数据处理方法、mvb通信网络及轨道交通车辆

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