JP5906145B2

JP5906145B2 - Transmission device, transmission system, and self-diagnosis method thereof

Info

Publication number: JP5906145B2
Application number: JP2012146143A
Authority: JP
Inventors: 直哉大西; 中谷　博司; 博司中谷; 鮫田　芳富; 芳富鮫田; 智天木; 誠登古
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2012-06-28
Filing date: 2012-06-28
Publication date: 2016-04-20
Anticipated expiration: 2032-06-28
Also published as: JP2014011591A

Description

本発明の実施形態は、伝送装置、伝送システム、及びその自己診断方法に関する。 Embodiments described herein relate generally to a transmission apparatus, a transmission system, and a self-diagnosis method thereof.

近年国際標準として、装置の製造者および供給者に対し、機能安全規格が国際電気標準化会議の規格IEC6１508「電気・電子・プログラマブル電子安全関連系の機能安全」として定められている。さらに、特定の産業用機能安全システムにおいては、特定の用途に合わせた安全規格が定められている。 In recent years, as an international standard, functional safety standards have been established as standard IEC 61508 “Functional safety of electrical / electronic / programmable electronic safety related systems” of the International Electrotechnical Commission for equipment manufacturers and suppliers. Furthermore, in a specific industrial functional safety system, a safety standard for a specific application is defined.

例えば、安全関連系のデータを伝送するための伝送システムについては、国際標準規格IEC6１784-3が定められている。 For example, an international standard IEC61784-3 is defined for a transmission system for transmitting safety-related data.

これらの規格では、システムの設計、保守、廃棄に至るライフサイクルにおける安全性を評価し、リスク軽減の要求レベルである安全度水準（SIL、Safety Integrity Level)を定量的な評価尺度として定めている。 These standards evaluate safety in the life cycle from system design, maintenance, and disposal, and define the safety integrity level (SIL, Safety Integrity Level), which is a required level of risk reduction, as a quantitative evaluation measure. .

このような背景から、特に、高い安全度水準を求められる安全計装システムにおいては、安全関連系のデータ伝送に関するデータのエラーを確実に検出する必要がある。 Against this background, in particular, in a safety instrumented system that requires a high safety level, it is necessary to reliably detect data errors related to safety-related data transmission.

例えば、冗長化処理装置から伝送装置を介して伝送される演算データについて、受信側装置で伝送時の伝送誤り検出を行うとともに、受信側装置で冗長化処理装置の各処理系の符号化データを確認する手段を設けることで、冗長化処理装置で生成された冗長系毎の演算データの誤りと、冗長系毎の故障診断とを可能とした冗長化制御システムの演算データの伝送方法がある（（例えば、特許文献１参照。）。 For example, for arithmetic data transmitted from the redundancy processing device via the transmission device, the reception side device performs transmission error detection at the time of transmission, and the reception side device converts the encoded data of each processing system of the redundancy processing device. By providing a means for checking, there is a method for transmitting operation data of a redundant control system that enables an error in operation data for each redundant system generated by the redundancy processing device and a failure diagnosis for each redundant system ( (For example, refer to Patent Document 1).

特開２０１２−４３２３０号公報JP 2012-43230 A

上述した特許文献１は、冗長化処理装置からネットワークを介して伝送される演算データについて、冗長化処理装置で生成された冗長系毎の演算データの誤りと、冗長系毎の故障診断とを受信側装置で検出が可能とした演算データの伝送方法である。 Patent Document 1 described above receives an error in operation data for each redundant system generated by the redundancy processing apparatus and a fault diagnosis for each redundant system for the operation data transmitted from the redundancy processing apparatus via the network. This is a calculation data transmission method that can be detected by the side device.

しかし、この伝送方法では、故障を判定する受信側装置の故障を診断することが出来ない。また、送信側、受信側の伝送装置が単独で伝送データの異常を検出することが出来ない問題がある。 However, with this transmission method, it is impossible to diagnose the failure of the receiving side device that determines the failure. In addition, there is a problem that the transmission apparatus on the transmission side and the reception side cannot detect abnormality of the transmission data alone.

したがって、送信する同じデータに対して送信側と受信側で伝送系の故障を確認ができないので、信頼性に欠ける問題がある。 Therefore, a failure in the transmission system cannot be confirmed on the transmission side and the reception side for the same data to be transmitted.

また、異なる２つの誤り検出符号を生成する生成部が必要で、データの伝送までの処理時間が増大する恐れもある。 In addition, a generation unit that generates two different error detection codes is required, which may increase the processing time until data transmission.

本発明は上述した問題点を解決するためになされたものであり、ネットワークに接続された夫々の伝送装置が、送信するデータの異常を送信側と受信側で、同じデータに対して相互に自己診断可能とした伝送装置、伝送システム、及びその自己診断方法を提供することを目的とする。 The present invention has been made to solve the above-described problems, and each transmission device connected to a network causes an abnormality in data to be transmitted to the same data on the transmission side and the reception side. It is an object of the present invention to provide a transmission device, a transmission system, and a self-diagnosis method thereof that can be diagnosed.

上記目的を達成するために、本実施形態の伝送システムは、複数の異機種伝送装置間で通信が可能なパケット交換方式のネットワークでのデータの伝送システムであって、前記伝送装置は、夫々が伝送するデータに対して異なる誤り検出符号を生成して伝送データとし、この誤り検出符号からシステムの故障を自己診断し、前記パケットのフォーマットは、少なくとも、宛先及び送り元を記述したヘッダと、送信するデータと、当該データに対して自身の伝送装置で生成する予め設定される第１の誤り検出符号及び当該データの宛先の伝送装置で生成する予め設定される第２の誤り検出符号とを記述し、夫々の前記伝送装置は、自身の伝送装置から送信するデータを記憶する記憶部から前記データを抽出し、当該データに対して、前記第１の誤り検出符号を生成する符号化部と、前記記憶部から前記データと、前記第１の誤り検出符号とを抽出し、前記フォーマットに基づいて１つまたは、複数のフレームデータとして生成する送信処理部と、受信した前記伝送データが送信した前記伝送データの場合、前記フォーマットに基づいてデータと、前記第１の誤り検出符号と、前記第２の誤り検出符号と、に分割し、または、受信した伝送データが送信した前記伝送データで無く、前記第２の誤り検出符号が付随されていない場合、受信した前記伝送データのデータ、第１の誤り検出符号に対して第２の誤り検出符号を生成して付随させる受信処理部と、前記伝送データに付随させて宛先に送信した前記第１の誤り検出符号と、その応答として当該宛先から受信した前記伝送データに付随する前記第１の誤り検出符号とを比較し、一致しているか否かを判定する比較部と、前記送信処理部で生成された前記伝送データを、前記ネットワークを介して送信、または、前記ネットワークを介して受信した前記伝送データを前記受信処理部に送る伝送部と、を備え、前記第１の誤り検出符号を生成する符号化部を備える前記伝送装置を第１の伝送装置とし、前記第２の誤り検出符号を生成する符号化部を備える前記伝送装置を第２の伝送装置とし、前記第１の伝送装置から、前記第２の伝送装置に前記伝送データを送信する場合、前記第１の伝送装置は、前記伝送部から前記伝送データを宛先となる第２の伝送装置に送信し、前記第２の伝送装置は、前記伝送データが、自身から送信したデータでなく、自身生成する第２の誤り検出訂正符号がない場合、受信した前記伝送データに含まれるデータと第１の誤り検出符号とから、更に、第２の誤り検出符号を生成し、当該伝送データに付随させて送り先に返信し、前記第１の伝送装置の前記受信処理部は、返信された当該伝送データを受信し、自身から送信した前記伝送データである場合、当該伝送データを前記比較部に送り、前記比較部は送信した前記第１の誤り検出符号と、返信された第１の誤り検出符号とを比較し、一致しているか否かを判定し、一致している場合、前記伝送部から受信した前記伝送データを宛先に再送し、前記第２の伝送装置は、この再送された伝送データを受信し、前記比較部で、自身で生成し付随させた第２の誤り検出データと、再送された前記伝送データに付随された第２の誤り検出データとを比較し、一致しているか否かを判定し、一致している場合、受信した前記伝送データが正常であると判定し、夫々の伝送装置が異なる誤り検出符号を生成する符号化部を備え、伝送データに付随さる自身が宛先に送信した誤り検出符号と、宛先から返信された誤り検出符号を比較することにより、伝送データの異常の有無を相互の伝送装置で自己診断するようにしたことを特徴とする。 In order to achieve the above object, the transmission system of the present embodiment is a data transmission system in a packet-switched network capable of communication between a plurality of different types of transmission apparatuses, and each of the transmission apparatuses includes: A different error detection code is generated for the data to be transmitted and used as transmission data. A system failure is self-diagnosed from the error detection code, and the format of the packet includes at least a header describing a destination and a source, and a transmission And a preset first error detection code generated by the transmission device for the data and a preset second error detection code generated by the destination transmission device for the data. Each of the transmission devices extracts the data from a storage unit that stores data to be transmitted from its transmission device, and the first data is extracted from the storage unit. A transmission processing unit that extracts the data and the first error detection code from the storage unit and generates one or a plurality of frame data based on the format And when the received transmission data is the transmitted data, the data is divided into data, the first error detection code, and the second error detection code based on the format, or received. If the transmission data is not the transmitted data and is not accompanied by the second error detection code, a second error detection code is generated for the received transmission data and the first error detection code. And attached to the transmission data received from the destination as a response to the first error detection code transmitted to the destination accompanying the transmission data. The first error detection code to be compared, a comparison unit for determining whether or not they match, and the transmission data generated by the transmission processing unit is transmitted via the network, or the network A transmission unit that sends the transmission data received via the transmission processing unit to the reception processing unit, the transmission device including the encoding unit that generates the first error detection code as the first transmission device, When the transmission device including an encoding unit that generates two error detection codes is a second transmission device and the transmission data is transmitted from the first transmission device to the second transmission device, the first transmission device The transmission device transmits the transmission data from the transmission unit to a second transmission device that is a destination, and the second transmission device generates the transmission data itself, not the data transmitted from itself. Error detection revision 2 If there is no positive code, a second error detection code is further generated from the data included in the received transmission data and the first error detection code, and is sent back to the destination along with the transmission data, The reception processing unit of the first transmission device receives the transmitted transmission data that is returned, and when the transmission data is transmitted from itself, transmits the transmission data to the comparison unit, and the comparison unit transmits the transmission data. The first error detection code and the returned first error detection code are compared to determine whether or not they match, and if they match, the transmission data received from the transmission unit is set as the destination The second transmission apparatus receives the retransmitted transmission data, and the comparison unit attaches the second error detection data generated and attached by itself to the retransmitted transmission data. Second error detection data and Comparing and determining whether or not they match, and if they match, it is determined that the received transmission data is normal, and each transmission device includes a coding unit that generates different error detection codes, By comparing the error detection code sent to the destination by the transmission data itself with the error detection code returned from the destination, the mutual transmission device self-diagnosed whether there is an abnormality in the transmission data. Features.

上記目的を達成するために、本実施形態の伝送装置は、複数の異機種伝送装置間で通信が可能なパケット交換方式のネットワークでのデータの伝送システムの伝送装置であって、前記伝送装置は、夫々が伝送するデータに対して異なる誤り検出符号を生成して伝送データとし、この誤り検出符号からシステムの故障を自己診断し、前記伝送データは、前記パケットのフォーマットは、少なくとも、宛先及び送り元を記述したヘッダと、送信するデータと、当該データに対して自身の伝送装置で生成する予め設定される第１の誤り検出符号及び当該データの宛先の伝送装置で生成する予め設定される第２の誤り検出符号とを記述し、夫々の前記伝送装置は、自身の伝送装置から送信するデータを記憶する記憶部から前記データを抽出し、当該データに対して、前記第１の誤り検出符号を生成する符号化部と、前記記憶部から前記データと、前記第１の誤り検出符号とを抽出し、前記フォーマットに基づいて１つまたは、複数のフレームデータとして生成する送信処理部と、受信した前記伝送データが送信した前記伝送データの場合、前記フォーマットに基づいてデータと、前記第１の誤り検出符号と、前記第２の誤り検出符号と、に分割し、または、受信した伝送データが送信した前記伝送データで無く、前記第２の誤り検出符号が付随されていない場合、受信した前記伝送データのデータ、第１の誤り検出符号に対して第２の誤り検出符号を生成して付随させる受信処理部と、前記伝送データに付随させて宛先に送信した前記第１の誤り検出符号と、その応答として当該宛先から受信した前記伝送データに付随する前記第１の誤り検出符号とを比較し、一致しているか否かを判定する比較部と、前記送信処理部で生成された前記伝送データを、前記ネットワークを介して送信、または、前記ネットワークを介して受信した前記伝送データを前記受信処理部に送る伝送部と、を備え、夫々の伝送装置が異なる誤り検出符号を生成する符号化部を備え、伝送データに付随さる自身が宛先に送信した誤り検出符号と、宛先から返信された誤り検出符号を比較することにより、伝送データの異常の有無を相互の伝送装置で自己診断するようにしたことを特徴とする。 In order to achieve the above object, a transmission apparatus according to the present embodiment is a transmission apparatus for a data transmission system in a packet-switched network capable of communication between a plurality of different types of transmission apparatuses, and the transmission apparatus includes: A different error detection code is generated for each data to be transmitted and used as transmission data. From this error detection code, a system failure is self-diagnosed. The transmission data has at least a destination and a transmission format. A header describing the original, data to be transmitted, a first error detection code that is set in advance by the transmission apparatus for the data, and a preset first that is generated by the transmission apparatus that is the destination of the data 2, each of the transmission devices extracts the data from a storage unit that stores data to be transmitted from its own transmission device, and The data is extracted from the storage unit and the data and the first error detection code, and one or more are extracted based on the format. A transmission processor for generating the frame data, and the transmission data received by the received transmission data, the data based on the format, the first error detection code, the second error detection code, Or the received transmission data is not the transmitted transmission data and is not accompanied by the second error detection code, the received transmission data data, the first error detection code A reception processing unit that generates and accompanies the second error detection code, the first error detection code that is transmitted to the destination along with the transmission data, and receives a response from the destination as the response. Comparing the first error detection code associated with the transmitted data and determining whether or not they match, and transmitting the transmission data generated by the transmission processing unit via the network A transmission unit that transmits or transmits the transmission data received via the network to the reception processing unit, and each transmission device includes an encoding unit that generates different error detection codes, and is attached to the transmission data. By comparing the error detection code transmitted to the destination with the error detection code returned from the destination, the presence or absence of abnormality in the transmission data is self-diagnosed by the mutual transmission devices.

上記目的を達成するために、本実施形態の伝送システムの自己診断方法は、複数の異機種伝送装置間で通信が可能なパケット交換方式のネットワークでのデータの伝送システムの自己診断方法であって、前記伝送装置は、夫々が伝送するデータに対して異なる誤り検出符号を生成して伝送データとし、この誤り検出符号からシステムの故障を自己診断し、前記パケットのフォーマットは、少なくとも、宛先及び送り元を記述したヘッダと、送信するデータと、当該データに対して自身の伝送装置で生成する予め設定される第１の誤り検出符号及び当該データの宛先の伝送装置で生成する予め設定される第２の誤り検出符号とを記述し、前記第１の誤り検出符号を生成する符号化部を備える前記伝送装置を第１の伝送装置とし、前記第２の誤り検出符号を生成する符号化部を備える前記伝送装置を第２の伝送装置とし、前記第１の伝送装置から、前記第２の伝送装置に前記伝送データを送信する場合、前記伝送データを送信する第１の伝送装置は、宛先となる第２の伝送装置に前記伝送データを送信し、前記第２の伝送装置は、前記伝送データが、自身から送信したデータでなく、自身で生成する第１の誤り検出訂正符号がない場合、受信した前記伝送データに含まれるデータと第１の誤り検出符号とから、更に、第２の誤り検出符号を生成し、前記伝送データに付随させて送り先に返信し、前記第１の伝送装置は、前記宛先からの返信された伝送データを受信し、自身から送信した伝送データの場合、当該伝送データを比較し、送信した前記第１の誤り検出符号と、宛先から返信された第１の誤り検出符号とが一致しているか否かを判定し、一致している場合、受信した当該伝送データを宛先に再送し、前記第２の伝送装置は、再送された伝送データを受信し、自身で生成し付随させた第２の誤り検出データと、再送された当該伝送データに付随された第２の誤り検出データとを比較し、一致しているか否かを判定し、一致している場合、受信した前記伝送データが正常であると判定し、夫々の伝送装置が異なる誤り検出符号を生成する符号化部を備え、伝送データに付随さる自身が宛先に送信した誤り検出符号と、宛先から返信された誤り検出符号とを比較することにより、伝送データの異常の有無を相互の伝送装置で自己診断するようにしたことを特徴とする。 In order to achieve the above object, the transmission system self-diagnosis method of this embodiment is a self-diagnosis method of a data transmission system in a packet-switched network capable of communication between a plurality of different types of transmission devices. The transmission apparatus generates different error detection codes for the data to be transmitted and uses them as transmission data, and self-diagnose a system failure from the error detection codes, and the format of the packet includes at least a destination and a transmission A header describing the original, data to be transmitted, a first error detection code that is set in advance by the transmission apparatus for the data, and a preset first that is generated by the transmission apparatus that is the destination of the data 2, the transmission device including an encoding unit that generates the first error detection code is defined as the first transmission device, and the second error is detected. When the transmission device including an encoding unit that generates an output code is a second transmission device, and the transmission data is transmitted from the first transmission device to the second transmission device, the transmission data is transmitted. The first transmission device transmits the transmission data to a second transmission device as a destination, and the second transmission device generates the transmission data by itself, not the data transmitted from itself. If there is no error detection / correction code, a second error detection code is further generated from the data included in the received transmission data and the first error detection code, and is returned to the destination along with the transmission data. The first transmission device receives the transmission data returned from the destination and, in the case of transmission data transmitted from itself, compares the transmission data and transmits the transmitted first error detection code; Reply from destination Whether the first error detection code matches, and if it matches, the received transmission data is retransmitted to the destination, and the second transmission device transmits the retransmitted transmission data to the destination. The second error detection data received, generated and attached by itself, is compared with the second error detection data attached to the retransmitted transmission data to determine whether or not they match. If the transmission data is received, the received transmission data is determined to be normal, and each transmission device includes an encoding unit that generates a different error detection code, and the error detection code that is attached to the transmission data is transmitted to the destination. And the error detection code returned from the destination, the transmission apparatus is self-diagnosed by the mutual transmission apparatus for the presence or absence of abnormality of the transmission data.

第１の実施形態の、伝送システム、伝送装置の構成図。1 is a configuration diagram of a transmission system and a transmission apparatus according to a first embodiment. 第１の実施形態の伝送データのフォーマット。The format of the transmission data of 1st Embodiment. 第１の実施形態の伝送方法を説明するフローチャート。The flowchart explaining the transmission method of 1st Embodiment. 第１の実施形態の伝送方法を説明するタイムチャート。The time chart explaining the transmission method of 1st Embodiment. 第１の実施形態の受信側の処理方法を説明するフローチャート。The flowchart explaining the processing method of the receiving side of 1st Embodiment. 第２の実施形態の伝送装置、伝送システムの構成図。The block diagram of the transmission apparatus of 2nd Embodiment, and a transmission system. 第７の実施形態の伝送方法を説明するフローチャート。The flowchart explaining the transmission method of 7th Embodiment.

以下、本発明の実施形態について図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the drawings.

（第１の実施形態）
図１乃至図５を参照して説明する。第１の実施形態の伝送システムの構成を図１に示す。第１の実施形態の伝送システム１００の構成は、伝送路５０に接続される複数の伝送装置２０、伝送装置３０、伝送装置４０、及び伝送装置ｎ０で構成される。 (First embodiment)
This will be described with reference to FIGS. The configuration of the transmission system of the first embodiment is shown in FIG. The configuration of the transmission system 100 of the first embodiment includes a plurality of transmission devices 20, a transmission device 30, a transmission device 40, and a transmission device n0 connected to the transmission path 50.

夫々の伝送装置は、伝送するデータに対して夫々が異なる誤り検出符号を生成してデータに付随させて伝送データとし、受信側の伝送装置でも受信した伝送データに対して、さらに誤り検出符号を生成して付随させて返信し、送信側、受信側の夫々で送信した誤り検出符号と受信した誤り検出符号とを比較して、伝送データの異常を相互で自己診断する伝送システムである。 Each transmission device generates a different error detection code for the data to be transmitted and attaches it to the data as transmission data. The transmission device on the receiving side further adds an error detection code to the received transmission data. This is a transmission system that generates and accompanies it, compares the error detection code transmitted on each of the transmission side and the reception side with the received error detection code, and self-diagnoses transmission data abnormalities.

この伝送システム１００は、伝送路５０を介してネットワークを形成する。このネットワークは、異機種の伝送装置間での通信が可能で、データをパケット交換方式で通信することが可能であれば良く、例えば、ＬＡＮ（Local Area Network）、ＣＡＮ（Controller Area Network）、ＦＬ−ｎｅｔ等の各種のネットワークが適用可能である。 The transmission system 100 forms a network via the transmission path 50. This network only needs to be able to communicate between different types of transmission apparatuses and to communicate data by a packet switching method. For example, LAN (Local Area Network), CAN (Controller Area Network), FL Various networks such as -net are applicable.

一般に、プラントの安全計装システムにおいては、データは、センサからの入力信号やアクチュエータを制御する制御情報などが相当し、このデータが伝送データとして生成され、ＬＡＮを介して送信側から受信側に伝送される。 In general, in a plant safety instrumentation system, data corresponds to input signals from sensors, control information for controlling actuators, etc., and this data is generated as transmission data from the transmission side to the reception side via the LAN. Is transmitted.

図２に示すように、この伝送データのパケットのフォーマットは、少なくとも、宛先及び送り元を記述したヘッダ（CH）と、送信するデータ（D）と、伝送するデータに対して送信側（送り元）の伝送装置で生成する予め設定される第１の誤り検出符号(CA)及び当該データの受信側（宛先）の伝送装置で生成する予め設定される第２の誤り検出符号（CB）とが記述される。 As shown in FIG. 2, the format of the transmission data packet includes at least a header (CH) describing a destination and a transmission source, data to be transmitted (D), and transmission side (transmission source). The first error detection code (CA) set in advance by the transmission apparatus in FIG. 4 and the second error detection code (CB) set in advance by the transmission apparatus on the receiving side (destination) of the data. Described.

さらに、タイムスタンプ、データの種類など伝送データとして必要な情報を記述するようにしても良い。 Furthermore, information necessary for transmission data such as a time stamp and data type may be described.

また、誤り検出符号としては、例えば、データの複数ビットの誤りを高い精度で検出可能な巡回符号（CRC）、パリティ（Parity）、チェックサム（Check sum）、ハッシュ関数（Hash Function）などを用いてもよい。 In addition, as an error detection code, for example, a cyclic code (CRC), a parity (Parity), a check sum (Check sum), a hash function (Hash Function) or the like that can detect an error of a plurality of bits of data with high accuracy is used. May be.

次に、各部の構成について説明する。まず、図１に示すように、伝送装置２０は、符号化部２１、送信処理部２２、受信処理部２３、伝送部２４、比較部２５、及び記憶部２６を備える。 Next, the configuration of each unit will be described. First, as illustrated in FIG. 1, the transmission device 20 includes an encoding unit 21, a transmission processing unit 22, a reception processing unit 23, a transmission unit 24, a comparison unit 25, and a storage unit 26.

符号化部２１、送信処理部２２、受信処理部２３、比較部２５、及び記憶部２６は、内部バスで接続される構成でも良いし、夫々が相互間で接続される構成としても良い。 The encoding unit 21, the transmission processing unit 22, the reception processing unit 23, the comparison unit 25, and the storage unit 26 may be connected by an internal bus, or may be connected by each other.

また、伝送するデータは、予め記憶部２６に記憶されているものとして説明するが、このデータは、図示しない伝送装置２０の外に設けられる演算装置からこの記憶部２６に記憶されるように構成されても良いし、演算装置の機能が伝送装置内に含まれる構成としても良い。 The data to be transmitted will be described as being stored in the storage unit 26 in advance, but this data is configured to be stored in the storage unit 26 from an arithmetic device provided outside the transmission device 20 (not shown). Alternatively, a configuration in which the function of the arithmetic device is included in the transmission device may be adopted.

夫々の伝送装置２０は、同じ構成であるので伝送装置２０の構成について説明し、他の伝送装置の説明を省略する。但し、後述する符号化部２１の誤り検出符号を生成する演算ロジックは、夫々の伝送装置で異なるものを使用する。 Since each transmission device 20 has the same configuration, the configuration of the transmission device 20 will be described, and description of other transmission devices will be omitted. However, the arithmetic logic for generating an error detection code of the encoding unit 21 to be described later is different for each transmission apparatus.

以上の構成において伝送装置２０は、自身の伝送装置２０から送信するデータを記憶する記憶部２６からデータを抽出し、このデータに対して符号化部２１では第１の誤り検出符号を生成し、さらに送信処理部２２では、記憶部２６からデータと符号化部２１で生成した第１の誤り検出符号とを抽出し、予め設定されるフォーマットに基づいて１つまたは、複数のフレームデータを生成し、伝送部２４からこの伝送データを、例えば、宛先となる伝送装置３０に送信する。 In the above configuration, the transmission device 20 extracts data from the storage unit 26 that stores data to be transmitted from its own transmission device 20, and the encoding unit 21 generates a first error detection code for this data, Further, the transmission processing unit 22 extracts the data and the first error detection code generated by the encoding unit 21 from the storage unit 26, and generates one or a plurality of frame data based on a preset format. Then, the transmission data is transmitted from the transmission unit 24 to, for example, the transmission device 30 serving as a destination.

符号化部２１で実行する誤り検出符号の演算は、MPU（Micro Processor Unit）などの処理によりソフトウェア的に計算しても良いし、論理回路、FPGA（Flexible Programming Gate Array）、DSP（Digital Signal Processor）、専用のICなどによりハードウェア的に計算する構成としても良い。 The operation of the error detection code executed by the encoding unit 21 may be calculated by software by processing such as an MPU (Micro Processor Unit), a logic circuit, an FPGA (Flexible Programming Gate Array), a DSP (Digital Signal Processor). ), Or a hardware calculation using a dedicated IC or the like.

そして、宛先の伝送装置３０から伝送装置２０で受信した伝送データに対して、受信処理部２３では、フォーマットに基づいてデータと、第１の誤り検出符号と、宛先の伝送装置３０で付随された第２の誤り検出符号と、に分割する。そして、比較部２５において、自身の伝送装置２０から伝送データに付随させて宛先に送信した第１の誤り検出符号と、その応答として宛先から受信した伝送データについて分割した第１の誤り検出符号と、を比較し、一致しているか否かを判定し、一致していれば、受信した伝送データを伝送部２４から宛先に再送する。 Then, for the transmission data received by the transmission device 20 from the destination transmission device 30, the reception processing unit 23 adds the data, the first error detection code, and the destination transmission device 30 based on the format. It divides | segments into a 2nd error detection code. Then, in the comparison unit 25, a first error detection code transmitted from the transmission apparatus 20 to the destination accompanying the transmission data, and a first error detection code obtained by dividing the transmission data received from the destination as a response, , And whether or not they match, and if they match, the received transmission data is retransmitted from the transmission unit 24 to the destination.

伝送部２４は、送信処理部２２で生成された伝送データを、ネットワーク５０を介して送信、または、ネットワーク５０を介して受信した伝送データを受信処理部２３に送る。 The transmission unit 24 transmits the transmission data generated by the transmission processing unit 22 via the network 50 or sends the transmission data received via the network 50 to the reception processing unit 23.

次に、このように構成された伝送システム１００のデータの伝送処理手順について図３及び図４のタイムチャートを参照して説明する。 Next, a data transmission processing procedure of the transmission system 100 configured as described above will be described with reference to time charts of FIGS.

ここでの説明は、送信側の伝送装置２０から受信側の伝送装置３０にデータを送信する場合について説明する。 In this description, a case where data is transmitted from the transmission device 20 on the transmission side to the transmission device 30 on the reception side will be described.

また、送信側の符号化部２１で生成される誤り検出符号を符号A、受信側の符号化部３１で生成される誤り検出符号を符号Bと記述し、これらの誤り検出符号が相手側から返信された場合の誤り検出符号は、夫々、符号A’、符号B’と記述することにする。 In addition, the error detection code generated by the transmission side encoding unit 21 is described as code A, the error detection code generated by the reception side encoding unit 31 is described as code B, and these error detection codes are transmitted from the partner side. The error detection codes when returned are described as code A ′ and code B ′, respectively.

また、自己診断は、１つの送信データに対して、送信側の伝送装置２０と受信側の伝送装置３０とで相互に診断するので、図４に示すように、送信側の伝送装置２０から伝送データAを受信側に送信、次に、伝送装置３０から伝送データBを送信側の伝送装置２０に返信、さらに、伝送装置２０から伝送装置３０に伝送データBを送信する、合計３回の通信が必要となる。 In the self-diagnosis, the transmission device 20 on the transmission side and the transmission device 30 on the reception side mutually diagnose one transmission data, so that transmission is performed from the transmission device 20 on the transmission side as shown in FIG. Data A is transmitted to the receiving side, then transmission data B is returned from the transmission apparatus 30 to the transmission apparatus 20 on the transmission side, and transmission data B is transmitted from the transmission apparatus 20 to the transmission apparatus 30 for a total of three communications Is required.

図３において、先ず、送信側の伝送装置２０では、符号化部２１で送信するデータのヘッダ及びそのデータから予め設定される誤り検出符号Aを生成する（ｓ１）。 In FIG. 3, first, the transmission apparatus 20 on the transmission side generates a preset error detection code A from the header of the data to be transmitted by the encoding unit 21 and the data (s1).

図３では、誤り検出符号Aは、符号Aと、また、図４では、ヘッダはH、データはD、誤り検出符号は、CAのように記述している。また、誤り検出符号Aを付随させて送信した伝送データは、伝送データA、誤り検出符号Bを付随させた伝送データは、伝送データBと記述している。 In FIG. 3, the error detection code A is described as code A, and in FIG. 4, the header is described as H, the data is D, and the error detection code is described as CA. The transmission data transmitted with the error detection code A is described as transmission data A, and the transmission data with the error detection code B is described as transmission data B.

次に、送信処理部２２では、ヘッダ、データ、生成した誤り検出符号Aから伝送データAを生成し（ｓ２）、生成した伝送データAを伝送部２４から伝送装置３０に送信する（ｓ３）。 Next, the transmission processing unit 22 generates transmission data A from the header, data, and the generated error detection code A (s2), and transmits the generated transmission data A from the transmission unit 24 to the transmission device 30 (s3).

次に、送信された伝送データAを受信する受信待ち状態（ｓ１１）の伝送装置３０は、伝送部２４でこの伝送データAを受信し（ｓ１２）、受信処理部２３では、この受信した伝送データAをヘッダ、データ、符号Aに分解する（ｓ１３）。 Next, the transmission device 30 in the reception waiting state (s11) that receives the transmitted transmission data A receives the transmission data A by the transmission unit 24 (s12), and the reception processing unit 23 receives the transmission data. A is decomposed into a header, data, and code A (s13).

次に、符号化部３１では、受信した伝送データAに対して、誤り検出符号Bを生成し（ｓ１４）、さらに、送信処理部２２では、受信処理部２３で処理したヘッダ、データ、及び符号化部３１で生成した符号Bから、設定されたフォーマットでの伝送データBを生成し（ｓ１５）、伝送部２４から伝送装置２０にこのデータを送信する。 Next, the encoding unit 31 generates an error detection code B for the received transmission data A (s14), and the transmission processing unit 22 further processes the header, data, and code processed by the reception processing unit 23. The transmission data B in the set format is generated from the code B generated by the conversion unit 31 (s15), and this data is transmitted from the transmission unit 24 to the transmission device 20.

すると、受信待ち状態の伝送装置２０（ｓ４）は、この伝送データBを受信し（ｓ５）、受信処理部２３で受信した伝送データBをヘッダ、データ、符号A、符号Bに分解する（ｓ６）。 Then, the transmission device 20 (s4) waiting for reception receives the transmission data B (s5), and decomposes the transmission data B received by the reception processing unit 23 into a header, data, code A, and code B (s6). ).

さらに、符号化部２１で、受信処理部２３で分解したヘッダ、データ、に対して符号A’を生成する（ｓ７）。 Further, the encoding unit 21 generates a code A 'for the header and data decomposed by the reception processing unit 23 (s7).

そして、比較部２５では、符号化部２１で送信時に生成した符号Aと、今回伝送データBから生成した、符号A’とを比較し、一致しているか否かを判定する（ｓ８）。 Then, the comparison unit 25 compares the code A generated at the time of transmission by the encoding unit 21 with the code A ′ generated from the transmission data B this time, and determines whether or not they match (s8).

比較の結果、一致していれば、伝送データBを伝送装置３０に送信する（ｓ９）。 If they match as a result of the comparison, the transmission data B is transmitted to the transmission device 30 (s9).

次に、受信待ちの伝送装置３０（ｓ１７）では、受信処理部２３で受信した伝送データBについて、ヘッダ、データ、符号A、及び符号Bに分解し（ｓ１９）、さらに、符号化部３１で分解したヘッダ、データ、符号Aから、符号B’を生成し（ｓ２０）、さらに、比較部２５で、伝送装置３０で付随させた符号Bと、今回生成した符号B’とを比較して（ｓ２１）、一致しているか否かを判定する（ｓ２２）。 Next, in the transmission device 30 (s17) waiting for reception, the transmission data B received by the reception processing unit 23 is decomposed into a header, data, code A, and code B (s19). A code B ′ is generated from the decomposed header, data, and code A (s20), and the comparison unit 25 compares the code B attached by the transmission device 30 with the code B ′ generated this time ( s21), it is determined whether or not they match (s22).

次に、図５を参照して、伝送データ受信時の受信処理部２３の処理動作について説明する。夫々の受信処理部は、伝送データを受信すると、自身が送信した伝送データであるか否かを判定し（ｓ１０１）、そうであれば、図３のステップ（ｓ５）に移行する。そうでなければ、さらに、自身で誤り検出符号があるか否かを判定し（ｓ１０２）、無ければ、図３のステップ（ｓ１２)に移行する。そうであれば、ステップ（ｓ１８）に移行する。 Next, the processing operation of the reception processing unit 23 when receiving transmission data will be described with reference to FIG. When receiving the transmission data, each reception processing unit determines whether or not the transmission data is transmitted by itself (s101). If so, the process proceeds to step (s5) in FIG. If not, it is further determined whether or not there is an error detection code by itself (s102), and if not, the process proceeds to step (s12) in FIG. If so, the process proceeds to step (s18).

以上説明したように、即ち、伝送装置２０から送信した伝送データAの符号Aと、返信された伝送データBから生成した符号A’とを比較し、また、伝送装置３０は、送信した伝送データBの符号Bと、返信された伝送データB’とを比較し、夫々が一致した場合に送信された伝送データAのデータは正常であるとして使用する。 As described above, that is, the code A of the transmission data A transmitted from the transmission apparatus 20 is compared with the code A ′ generated from the returned transmission data B, and the transmission apparatus 30 transmits the transmitted transmission data. The code B of B and the returned transmission data B ′ are compared, and the transmission data A transmitted when they match each other is used as normal.

また、夫々の比較部２５で符号の不一致が検出された場合には、伝送データA、伝送データBの伝送路、送信側の伝送装置、及び受信側の伝送装置のいずれかの部分に故障があると判定される。 Further, when a code mismatch is detected by each comparison unit 25, a failure occurs in any part of the transmission path of transmission data A, transmission data B, the transmission device on the transmission side, and the transmission device on the reception side. It is determined that there is.

即ち、このように構成された伝送システムにおいては、送信側の伝送装置、受信側の伝送装置の相互で同じデータに対して自己診断が出来るので、伝送されるデータは高い信頼度を有し、高い安全度水準を求められる安全計装システムにおいてデータの信頼性を向上させることが出来る。 That is, in the transmission system configured in this way, the transmission data on the transmission side and the transmission device on the reception side can perform self-diagnosis on the same data, so the transmitted data has high reliability, Data reliability can be improved in a safety instrumented system that requires a high safety level.

（第２の実施形態）
次に、本発明に係る伝送システム１００の第２の実施形態について図６、及び図7を参照して説明する。第２の実施形態の各部について第１の実施形態と同一の部分は同じ符号を付し、その説明を省略する。 (Second Embodiment)
Next, a second embodiment of the transmission system 100 according to the present invention will be described with reference to FIG. 6 and FIG. About each part of 2nd Embodiment, the part same as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

第２の実施形態が第１の実施形態と異なる点は、第１の実施形態では、符号化部２１は、１つの符号化部２１を備えていたが、第２の実施形態では、データを送信する場合に符号を生成する符号化部２１ａと、受信したデータに対して符号を生成する符号化部２２ｂと、を備え、異なる符号化部２つを設ける構成としことにある。 The difference between the second embodiment and the first embodiment is that, in the first embodiment, the encoding unit 21 includes one encoding unit 21. However, in the second embodiment, data is not stored. An encoding unit 21a that generates a code for transmission and an encoding unit 22b that generates a code for received data are provided, and two different encoding units are provided.

次に、図７を参照して、第２の実施形態の伝送方法の処理手順を説明する。図７に示すフローチャートが、図３に示すフローチャートと異なる点は、送信側の伝送装置２０での誤り符号検出符号の生成は、データ送信時は符号化部２１ａ（ｓ２)で、データ受信時は符号化部２１ｂ(ｓ７)で、また、受信側の伝送装置３０での誤り符号検出符号の生成は、データ送信時は符号化部３１ａ(ｓ１５)で、データ受信時は符号化部３１ｂ（ｓ２０）で、夫々行うようにしていることにある。その他は、図３のフローチャートと同じであるのでその詳細説明を省略する。 Next, the processing procedure of the transmission method of the second embodiment will be described with reference to FIG. The flowchart shown in FIG. 7 differs from the flowchart shown in FIG. 3 in that the generation of the error code detection code in the transmission apparatus 20 on the transmission side is performed by the encoding unit 21a (s2) at the time of data transmission, and at the time of data reception. The encoding unit 21b (s7) and the generation of the error code detection code in the transmission device 30 on the receiving side are performed by the encoding unit 31a (s15) when transmitting data, and the encoding unit 31b (s20) when receiving data. ), And that is to do each. Others are the same as those in the flowchart of FIG.

このような第２の実施形態に拠れば、同じ符号を生成する２つの符号化部の符号を比較することで、符号化部２１ａ、符号化部２１ｂの故障を自己診断することができる。 According to the second embodiment, a failure of the encoding unit 21a and the encoding unit 21b can be self-diagnosed by comparing the codes of two encoding units that generate the same code.

本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

２０、３０、ｎ０伝送装置
２１、２１ａ、２１ｂ、３１ａ、３１ｂ符号化部
２２送信処理部
２３受信処理部
２４伝送部
２５比較部
２６記憶部
３０メモリ故障検出部
５０伝送路
１００伝送システム 20, 30, n0 Transmission devices 21, 21a, 21b, 31a, 31b Encoding unit 22, Transmission processing unit 23 Reception processing unit 24 Transmission unit 25 Comparison unit 26 Storage unit 30 Memory failure detection unit 50 Transmission path 100 Transmission system

Claims

A data transmission system in a packet switching network capable of communication between a plurality of different types of transmission devices,
The transmission device generates different error detection codes for the data transmitted by each of the transmission devices, and makes the transmission data self-diagnosis of a system failure from the error detection codes,
The format of the packet includes at least a header describing a destination and a source, data to be transmitted, a first error detection code set in advance by the transmission apparatus for the data, and a destination of the data A second error detection code set in advance generated by the transmission apparatus of
Each of the transmission devices extracts the data from a storage unit that stores data to be transmitted from its transmission device, and generates an encoding unit that generates the first error detection code for the data.
A transmission processing unit that extracts the data and the first error detection code from the storage unit and generates one or a plurality of frame data based on the format;
When the transmission data received is the transmission data transmitted, the transmission data is divided into data, the first error detection code, and the second error detection code based on the format, or the received transmission data If the transmission data is not the transmitted data and is not accompanied by the second error detection code, a second error detection code is generated for the received transmission data and the first error detection code. A reception processing unit to be attached;
Whether the first error detection code transmitted to the destination along with the transmission data is compared with the first error detection code attached to the transmission data received from the destination as a response to match. A comparison unit for determining whether or not,
A transmission unit that transmits the transmission data generated by the transmission processing unit via the network, or that transmits the transmission data received via the network to the reception processing unit;
With
The transmission apparatus including the encoding unit that generates the first error detection code is the first transmission apparatus, and the transmission apparatus including the encoding unit that generates the second error detection code is the second transmission apparatus. And when transmitting the transmission data from the first transmission device to the second transmission device,
The first transmission device transmits the transmission data from the transmission unit to a second transmission device as a destination,
When the transmission data is not data transmitted from itself and there is no second error detection / correction code generated by the second transmission apparatus, the second transmission apparatus and the first error detection include data included in the received transmission data. A second error detection code is further generated from the code, and is sent back to the destination along with the transmission data,
The reception processing unit of the first transmission device receives the transmitted transmission data, and when the transmission data is the transmission data transmitted from itself, the transmission processing unit sends the transmission data to the comparison unit, and the comparison unit transmits the transmission data. The first error detection code and the returned first error detection code are compared to determine whether or not they match. If they match, the transmission data received from the transmission unit is sent to the destination Resend to
The second transmission apparatus receives the retransmitted transmission data, and the comparison unit generates second error detection data generated and attached thereto, and the second error detection data attached to the retransmitted transmission data. Is compared with the error detection data, and it is determined whether or not they match, and if they match, it is determined that the received transmission data is normal,
Each transmission device includes an encoding unit that generates different error detection codes, and the transmission data is compared by comparing the error detection code transmitted to the destination with the transmission data and the error detection code returned from the destination. A transmission system characterized by self-diagnosis of mutual abnormality using a mutual transmission device.

A transmission device of a data transmission system in a packet switching network capable of communication between a plurality of different types of transmission devices,
The transmission device generates different error detection codes for the data transmitted by each of the transmission devices, and makes the transmission data self-diagnosis of a system failure from the error detection codes,
The format of the packet includes at least a header describing a destination and a source, data to be transmitted, a first error detection code set in advance by the transmission apparatus for the data, and a destination of the data A second error detection code set in advance generated by the transmission apparatus of
Each of the transmission devices extracts the data from a storage unit that stores data to be transmitted from its transmission device, and generates an encoding unit that generates the first error detection code for the data.
A transmission processing unit that extracts the data and the first error detection code from the storage unit and generates one or a plurality of frame data based on the format;
When the transmission data received is the transmission data transmitted, the transmission data is divided into data, the first error detection code, and the second error detection code based on the format, or the received transmission data If the transmission data is not the transmitted data and is not accompanied by the second error detection code, a second error detection code is generated for the received transmission data and the first error detection code. A reception processing unit to be attached;
Whether the first error detection code transmitted to the destination along with the transmission data is compared with the first error detection code attached to the transmission data received from the destination as a response to match. A comparison unit for determining whether or not,
A transmission unit that transmits the transmission data generated by the transmission processing unit via the network, or that transmits the transmission data received via the network to the reception processing unit;
With
Each transmission device includes an encoding unit that generates different error detection codes, and the transmission data is compared by comparing the error detection code transmitted to the destination with the transmission data and the error detection code returned from the destination. A transmission device for a transmission system, wherein the mutual transmission devices self-diagnose the presence or absence of abnormality.

A self-diagnosis method for a data transmission system in a packet-switched network capable of communication between a plurality of different types of transmission devices,
The transmission device generates different error detection codes for the data transmitted by each of the transmission devices, and makes the transmission data self-diagnosis of a system failure from the error detection codes,
The format of the packet includes at least a header describing a destination and a source, data to be transmitted, a first error detection code set in advance by the transmission apparatus for the data, and a destination of the data A second error detection code set in advance generated by the transmission apparatus of
The transmission apparatus including the encoding unit that generates the first error detection code is the first transmission apparatus, and the transmission apparatus including the encoding unit that generates the second error detection code is the second transmission apparatus. And when transmitting the transmission data from the first transmission device to the second transmission device,
A first transmission device that transmits the transmission data transmits the transmission data to a second transmission device that is a destination;
When the transmission data is not data transmitted from itself and there is no first error detection / correction code generated by the second transmission apparatus, the data included in the received transmission data and the first error are transmitted. A second error detection code is further generated from the detection code, and is sent back to the destination along with the transmission data,
The first transmission device receives the transmission data returned from the destination, and in the case of transmission data transmitted from itself, compares the transmission data and transmits the first error detection code transmitted from the destination. It is determined whether or not the returned first error detection code matches, and if it matches, the received transmission data is retransmitted to the destination,
The second transmission device receives the retransmitted transmission data, generates the second error detection data generated and attached thereto, and the second error detection data attached to the retransmitted transmission data. Compare and determine whether they match, and if they match, determine that the received transmission data is normal,
Each transmission device is provided with an encoding unit that generates different error detection codes, and the transmission is performed by comparing the error detection code transmitted by the transmission data itself to the destination with the error detection code returned from the destination. A self-diagnosis method for a transmission system, characterized in that self-diagnosis is performed with a mutual transmission device for the presence or absence of data abnormality.