JPH05327743A - Transmission line control method for data communication system - Google Patents
Transmission line control method for data communication systemInfo
- Publication number
- JPH05327743A JPH05327743A JP4128365A JP12836592A JPH05327743A JP H05327743 A JPH05327743 A JP H05327743A JP 4128365 A JP4128365 A JP 4128365A JP 12836592 A JP12836592 A JP 12836592A JP H05327743 A JPH05327743 A JP H05327743A
- Authority
- JP
- Japan
- Prior art keywords
- remote
- station
- disconnection
- transmission line
- information
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Small-Scale Networks (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、１つのマスタ局と複数
のリモート局を二重化ループ伝送路で結合したデータ通
信システムに係り、特にデータ伝送系の故障発生時の伝
送路制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication system in which one master station and a plurality of remote stations are connected by a duplex loop transmission line, and more particularly to a transmission line control method when a failure occurs in the data transmission system.
【０００２】[0002]
【従来の技術】二重化ループ伝送路方式のデータ通信シ
ステムを図２に例示する。１つのマスタ局１と３つのリ
モート局２1〜２3は１系のループ伝送路３1とこれと逆
伝送方向になる２系のループ伝送路３2によって結合さ
れる。2. Description of the Related Art FIG. 2 illustrates a dual loop transmission line type data communication system. One master station 1 and three remote stations 2 1 to 2 3 are connected by a 1-system loop transmission line 3 1 and a 2-system loop transmission line 3 2 in the opposite transmission direction.
【０００３】マスタ局１及びリモート局２1〜２3内の破
線は、通常状態のデータ送受信経路を示し、マスタ局１
ではノーマルモードになって１系と２系の伝送路３1，
３2の両方へデータ送信し、１系の伝送路３1からデータ
受信する。リモート局２1〜２ 3はバイパスモードになっ
て１系と２系の伝送路３1，３2の両方からのデータ受信
を同じ伝送路３1，３2へバイパス送信する。Master station 1 and remote station 21~ 23Inner defeat
The line indicates the data transmission / reception path in the normal state, and the master station 1
Then, in normal mode, the transmission line 3 of the 1st and 2nd systems1，
Three2Data transmission to both of the1Data from
To receive. Remote station 21~ 2 3Is in bypass mode
1 and 2 transmission lines 31, 32Receiving data from both
Same transmission line 31, 32Bypass to.
【０００４】上述のシステム構成において、リモート局
の１つの電源ダウンや局間の伝送路断線などデータ伝送
系の故障発生には故障検出局がループバック処理又はバ
イパス処理することによって伝送系を再構築し、データ
伝送の継続を可能にする。In the above-mentioned system configuration, when a failure occurs in the data transmission system such as one power-down of the remote station or disconnection of the transmission line between the stations, the failure detection station performs loopback processing or bypass processing to reconstruct the transmission system. It enables continuous data transmission.
【０００５】図３はリモート局２1と２2間の伝送路断線
の場合の伝送系構成を示す。リモート局２2は１系の断
線をそのデータ受信不能で検出したときにループバック
モードに切り換え、２系に零信号を送信する。同様に、
リモート局２1は２系の断線を検出したときにループバ
ックモードに切り換える。マスタ局１は１系と２系の両
方とも断線を検出しておらず、リモート局のいずれかが
故障発生しているときに２系受信データを２系送信デー
タとするバイパスモードになる。FIG. 3 shows a transmission system configuration in the case where the transmission line between the remote stations 2 1 and 2 2 is broken. The remote station 2 2 switches to the loopback mode when it detects the disconnection of the 1-system because it cannot receive the data, and transmits a zero signal to the 2-system. Similarly,
Remote station 2 1 is switched to the loopback mode upon detection of the disconnection of the 2 systems. The master station 1 does not detect disconnection in both the 1st system and the 2nd system, and enters a bypass mode in which the 2nd system reception data is the 2nd system transmission data when any of the remote stations has a failure.
【０００６】このマスタ局は、各リモート局の故障情報
をサイクリックな通信によって常時収集しており、リモ
ート局からのループバック処理で故障情報を収集したと
きにバイパスモードにするような伝送路制御を行う。The master station constantly collects the failure information of each remote station by cyclic communication, and controls the transmission path so as to set the bypass mode when the failure information is collected by the loopback process from the remote station. I do.
【０００７】[0007]
【発明が解決しようとする課題】従来の伝送路制御方法
では、一重故障には伝送系確保ができるが、二重故障の
場合の復帰で問題があった。In the conventional transmission line control method, the transmission system can be secured for a single failure, but there is a problem in recovery in the case of a double failure.
【０００８】図４はリモート局２2と２3の伝送路が断線
し、しかもリモート局２3が電源ダウンした二重故障発
生時の伝送系構成を示す。この構成ではマスタ局１は１
系断線（１系受信なし）を検出しているためノーマルモ
ードになり、リモート局２2はループバックモード、２1
はバイパスモード、２3は電源ダウンで無動作になる。FIG. 4 shows the configuration of the transmission system when the transmission lines of the remote stations 2 2 and 2 3 are disconnected, and the remote station 2 3 is powered down and a double failure occurs. In this configuration, the master station 1 is 1
Since the system disconnection (no 1-system reception) is detected, the normal mode is set, and the remote station 2 2 is in the loopback mode 2 1
Is in bypass mode and 2 3 is inactive due to power down.
【０００９】上述の二重故障状態でリモート局２3が電
源復帰したとき、リモート局２3はループバックモード
になりマスタ局１へ１系の信号を送信する。この信号を
受信するマスタ局１では１系，２系共にデータ受信し、
またリモート局２1，２2から１系断線を通知されないた
めノーマルモードになる。この状態は図５に示す構成と
なり、リモート局２1，２2はマスタ局１からのデータを
受信できる。しかしながら、リモート局２1，２2はデー
タを２系で送信するのに対しマスタ局１は１系のデータ
を受信するためマスタ局１はリモート局２1，２2からの
データを受信できない。When the power supply of the remote station 2 3 is restored in the above-mentioned double failure state, the remote station 2 3 enters the loopback mode and transmits the 1-system signal to the master station 1. The master station 1 receiving this signal receives data from both the 1-system and 2-system,
Also, since the remote stations 2 1 and 2 2 are not notified of the disconnection of the 1-system, the normal mode is set. This state has the configuration shown in FIG. 5, and the remote stations 2 1 and 2 2 can receive the data from the master station 1. However, while the remote stations 2 1 and 2 2 transmit data in the 2 system, the master station 1 receives data in the 1 system, so the master station 1 cannot receive data from the remote stations 2 1 and 2 2 .
【００１０】この後、マスタ局１はリモート局２3から
１系の断線情報を受信することでバイパスモードにな
り、図６に示す伝送系構成となり、全局の伝送可能状態
となる。即ち、図５から図６への移行期間中はリモート
局２1，２2の情報がマスタ局１へ伝送されないことにな
る。この移行期間は、一般にリモート局２3の電源復帰
によるソフトウェアの立上り時間になるため数秒を要
し、故障復旧が遅れる問題があった。After this, the master station 1 receives the disconnection information of the 1-system from the remote station 2 3 and enters the bypass mode, and the transmission system configuration shown in FIG. 6 is established and all stations are ready for transmission. That is, during the transition period from FIG. 5 to FIG. 6, the information of the remote stations 2 1 and 2 2 is not transmitted to the master station 1. The transition period, generally takes several seconds to become the rise time of the software by the power restoration of the remote station 2 3, there is a fault recovery is delayed problem.
【００１１】本発明の目的は、二重故障からの復旧時の
伝送系再構築を速やかにする伝送路制御方法を提供する
ことにある。It is an object of the present invention to provide a transmission line control method that promptly rebuilds a transmission system at the time of recovery from a double failure.
【００１２】[0012]
【課題を解決するための手段】本発明は前記課題の解決
を図るため、１つのマスタ局と複数のリモート局を１系
と２系の二重化ループ伝送路で結合し、前記マスタと各
リモート局はサイクリック伝送で情報交換し、前記マス
タ局は１系と２系の伝送路へのデータ送信と１系伝送路
からのデータ受信を行うノーマルモード及びリモート局
からの故障情報受信で２系伝送路の受信を２系へ送信す
るバイパスモードを有し、前記各リモート局は１系と２
系を夫々送受信するバイパスモード及び故障発生時に１
系伝送路と２系伝送路との間でデータを戻すループバッ
クモードを有するデータ通信システムにおいて、前記マ
スタ局は前記リモート局のいずれかから一定時間内にデ
ータ受信がなくかつまたは、リモート局のいずれかが１
系断線を通知している場合で１系かつ２系の伝送路から
の受信があるときにバイパスモードにすることを特徴と
する。In order to solve the above-mentioned problems, the present invention connects one master station and a plurality of remote stations by a duplex loop transmission line of 1-system and 2-system, and the master and each remote station. Information is exchanged by cyclic transmission, and the master station transmits data to the transmission paths of the 1-system and 2-system and receives data from the 1-system transmission path in the normal mode and the failure information is received from the remote station. There is a bypass mode for transmitting the reception of the route to the 2nd system, and each of the remote stations has the 1st system and the 2nd system.
Bypass mode for transmitting and receiving each system, and 1 when a failure occurs
In a data communication system having a loopback mode for returning data between a system transmission line and a system 2 transmission line, the master station does not receive data from any of the remote stations within a fixed time and / or Either one
When the system disconnection is notified, the bypass mode is set when there is a reception from the transmission paths of the 1st system and the 2nd system.
【００１３】[0013]
【作用】マスタ局はサイクリック伝送による情報交換に
よって伝送系に存在するリモート局を確認しており、こ
の各リモート局から一定時間内の受信が無いときかつ１
系と２系の伝送路からの受信が有るときはバイパスモー
ドとする。これにより、二重故障発生時にノーマルモー
ドにしておき、電源復帰による１系の伝送路からの受信
有りで直ちにバイパスモードに入り、電源ダウンのリモ
ート局のソフトウェアの立上りを待つことなく、他のリ
モート局からの受信を可能とする。[Operation] The master station confirms the remote stations existing in the transmission system by exchanging information by cyclic transmission. When there is no reception from each remote station within a certain time,
When there is a reception from the transmission path of the system and the system 2, the bypass mode is set. As a result, when a double failure occurs, the normal mode is set, the bypass mode is immediately entered when there is a reception from the 1-system transmission line due to the restoration of the power supply, and there is no need to wait for the software of the remote station whose power is down to start up. Allows reception from the station.
【００１４】[0014]
【実施例】図１は本発明の一実施例を示すマスタ局の伝
送系制御フローチャートである。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a flow chart of a transmission system control of a master station showing an embodiment of the present invention.
【００１５】マスタ局１は、サイクリックに各リモート
局２1〜２3との情報交換をしており、各リモート局２1
〜２3の存在確認と断線情報も収集している（Ｓ１）。
そして、マスタ局の１系断線又は２系断線が有るとき
（Ｓ２）にノーマルモードになる（Ｓ３）。The master station 1 cyclically exchanges information with each remote station 2 1 to 2 3 and each remote station 2 1
Existence confirmation and disconnection information to 2 3 is also collected (S1).
When there is a 1-system disconnection or a 2-system disconnection of the master station (S2), the normal mode is set (S3).
【００１６】また、ステップＳ２で１系，２系共に断線
無しの情報を受けているとき、リモート局２1〜２3から
一定時間内に情報受信が無いとき（Ｓ４）にはバイパス
モードになる（Ｓ５）。さらに、各リモート局から一定
時間内の受信があるもリモート局のいずれかの局で１系
断線を検出しているとき（Ｓ６）にバイパスモードにな
る（Ｓ５）。そして、１系断線を検出していないときは
ノーマルモードになる（Ｓ３）。Further, when the information indicating that there is no disconnection is received in both the 1st and 2nd systems in step S2, and there is no information received from the remote stations 2 1 to 2 3 within a fixed time (S4), the bypass mode is set. (S5). Further, even if there is a reception from each remote station within a certain time, when any one of the remote stations detects the disconnection of the 1-system (S6), the bypass mode is set (S5). When the disconnection of the 1-system is not detected, the normal mode is set (S3).
【００１７】上述の伝送系制御により、図２に示すシス
テムの通常状態では、マスタ局はステップＳ１→Ｓ２→
Ｓ４→Ｓ６→Ｓ３の経路でノーマルモードにある。ま
た、図３に示す伝送路断線時にはリモート局２2からの
１系断線情報受信により、ステップＳ１→Ｓ２→Ｓ４→
Ｓ６→Ｓ５の経路でバイパスモードになる。By the above transmission system control, in the normal state of the system shown in FIG. 2, the master station performs steps S1 → S2 →
It is in the normal mode along the route of S4 → S6 → S3. In addition, when the transmission line is disconnected as shown in FIG. 3, the system 1 disconnection information is received from the remote station 2 2 , so that steps S1 → S2 → S4 →
The bypass mode is entered through the route of S6 → S5.
【００１８】次に図４に示す二重故障時にはマスタ局自
身の１系断線によってステップＳ１→Ｓ２→Ｓ３の経路
でノーマルモードになる。そして、図５に示すリモート
局２3の電源復帰には、マスタ局１は１系の断線復帰に
よりステップＳ１→Ｓ２→Ｓ４→Ｓ４→Ｓ５の経路で直
ちにバイパスモードになる。Next, in the case of the double failure shown in FIG. 4, the normal mode is set on the route of steps S1.fwdarw.S2.fwdarw.S3 by the disconnection of the system 1 of the master station itself. Then, the power supply return of the remote station 2 3 shown in FIG. 5, the master station 1 is immediately made to the bypass mode in the path of step S1 → S2 → S4 → S4 → S5 by disconnection return 1 system.
【００１９】従って、リモート局２3の電源復帰時には
該リモート局２3のソフトウェアの立上りによる１系断
線の情報を待つことなく、図４の状態から直ちに図６の
状態に移行し、速やかな復旧になる。[0019] Thus, without the time of power restoration of the remote station 2 3 waits for information of 1 system disconnection due rise of software of the remote station 2 3, immediately shifts to the state of FIG. 6 from the state shown in FIG. 4, rapid recovery become.
【００２０】[0020]
【発明の効果】以上のとおり、本発明によれば、マスタ
局のバイパスモードへの移行条件として、リモート局か
ら一定時間内にデータ受信が無く、又はリモート局のい
ずれかから１系断線の通知がある場合でかつ１系及び２
系の伝送路からの受信があることとしたため、二重故障
の復旧を速やかにする効果がある。なお、バイパスモー
ドへの移行はソフトウェアの追加のみで済み、マスタ局
を複雑にすることは無い。As described above, according to the present invention, as a condition for the master station to shift to the bypass mode, no data is received from the remote station within a certain time, or one of the remote stations notifies the disconnection of one system. If there is and 1 system and 2
Since it is determined that there is a reception from the transmission line of the system, it has an effect of promptly recovering from the double failure. It should be noted that the transition to the bypass mode only requires the addition of software and does not complicate the master station.
【図１】本発明の一実施例を示すマスタ局のフローチャ
ート。FIG. 1 is a flowchart of a master station showing an embodiment of the present invention.
【図２】データ通信システム構成図。FIG. 2 is a block diagram of a data communication system.
【図３】断線時の伝送系構成図。FIG. 3 is a configuration diagram of a transmission system when the wire is disconnected.
【図４】二重故障時の伝送系構成図。FIG. 4 is a configuration diagram of a transmission system at the time of double failure.
【図５】電源復帰時の伝送系構成図。FIG. 5 is a configuration diagram of a transmission system when power is restored.
【図６】断線情報受信後の伝送系構成図。FIG. 6 is a configuration diagram of a transmission system after receiving disconnection information.
１…マスタ局 ２1，２2，２3…リモート局1 ... Master station 2 1 , 2 2 , 2 3 ... Remote station
Claims (1)
系と２系の二重化ループ伝送路で結合し、前記マスタと
各リモート局はサイクリック伝送で情報交換し、前記マ
スタ局は１系と２系の伝送路へのデータ送信と１系伝送
路からのデータ受信を行うノーマルモード及びリモート
局からの故障情報受信で２系伝送路の受信を２系へ送信
するバイパスモードを有し、前記各リモート局は１系と
２系を夫々送受信するバイパスモード及び故障発生時に
１系伝送路と２系伝送路との間でデータを戻すループバ
ックモードを有するデータ通信システムにおいて、 前記マスタ局は前記リモート局のいずれかから一定時間
内にデータ受信がなくかつまたは、リモート局のいずれ
かが１系断線を通知している場合で１系かつ２系の伝送
路からの受信があるときにバイパスモードにすることを
特徴とするデータ通信システムの伝送路制御方法。1. A master station and a plurality of remote stations
The master and each remote station exchange information by cyclic transmission, and the master station transmits data to the 1-system and 2-system transmission lines and from the 1-system transmission line. Has a bypass mode in which the reception of the 2nd system transmission path is transmitted to the 2nd system when the failure information is received from the remote station, and each of the remote stations transmits and receives the 1st system and the 2nd system respectively. And a data communication system having a loopback mode for returning data between the 1-system transmission line and the 2-system transmission line when a failure occurs, wherein the master station has not received data from any of the remote stations within a predetermined time, and Alternatively, when any one of the remote stations notifies the disconnection of the 1-system, the data communication is characterized by setting the bypass mode when receiving from the transmission paths of the 1-system and the 2-system. System transmission line control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04128365A JP3082425B2 (en) | 1992-05-21 | 1992-05-21 | Transmission line control method for data communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04128365A JP3082425B2 (en) | 1992-05-21 | 1992-05-21 | Transmission line control method for data communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05327743A true JPH05327743A (en) | 1993-12-10 |
| JP3082425B2 JP3082425B2 (en) | 2000-08-28 |
Family
ID=14983024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04128365A Expired - Lifetime JP3082425B2 (en) | 1992-05-21 | 1992-05-21 | Transmission line control method for data communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3082425B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011176718A (en) * | 2010-02-25 | 2011-09-08 | Hitachi Industrial Equipment Systems Co Ltd | Information processing apparatus and control network system |
| JP2017514378A (en) * | 2014-04-30 | 2017-06-01 | オムロン株式会社 | Connection of multiple slave units to a master control unit in a distributed control system |
-
1992
- 1992-05-21 JP JP04128365A patent/JP3082425B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011176718A (en) * | 2010-02-25 | 2011-09-08 | Hitachi Industrial Equipment Systems Co Ltd | Information processing apparatus and control network system |
| US9148297B2 (en) | 2010-02-25 | 2015-09-29 | Hitachi, Ltd. | Information processor and control network system |
| JP2017514378A (en) * | 2014-04-30 | 2017-06-01 | オムロン株式会社 | Connection of multiple slave units to a master control unit in a distributed control system |
| US10498553B2 (en) | 2014-04-30 | 2019-12-03 | Omron Corporation | Connecting a plurality of slave units to a master control unit in a distributed control system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3082425B2 (en) | 2000-08-28 |
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