JP2884897B2 - Redundant loop network system - Google Patents
Redundant loop network systemInfo
- Publication number
- JP2884897B2 JP2884897B2 JP4078964A JP7896492A JP2884897B2 JP 2884897 B2 JP2884897 B2 JP 2884897B2 JP 4078964 A JP4078964 A JP 4078964A JP 7896492 A JP7896492 A JP 7896492A JP 2884897 B2 JP2884897 B2 JP 2884897B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- control information
- clock
- transmission
- master node
- 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.)
- Expired - Lifetime
Links
Landscapes
- Small-Scale Networks (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、二重化ループネットワ
ークシステムに関し、特にクロック同期方式を採用した
二重化ループネットワークシステムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex loop network system, and more particularly to a duplex loop network system employing a clock synchronization system.
【０００２】[0002]
【従来の技術】従来の二重化ループネットワークシステ
ムでは、クロック発生源としてマスタノードの代行処理
可能なスレーブノード数は制限されており、又、代行処
理可能なスレーブノードとマスタノードとは、互いに通
信を行いながら制御を行うという手法が採られていた。2. Description of the Related Art In a conventional duplex loop network system, the number of slave nodes capable of performing alternate processing of a master node as a clock generation source is limited, and the slave node capable of performing alternate processing and the master node communicate with each other. The technique of performing control while performing was adopted.
【０００３】[0003]
【発明が解決しようとする課題】この従来の方式では、
伝送路等の障害によりマスタノードの代行を行えないス
レーブノード群のみの構成となった場合、その接続が正
常であるノード間の通信もできなくなるという問題点が
あった。又、全スレーブノードをマスタノードの代行可
能とした場合でも、マスタノードと各スレーブノード間
で制御のための通信が必要となり、制御情報量が多くな
るという欠点を有していた。In this conventional system,
In the case where only a group of slave nodes cannot act as a master node due to a failure in a transmission path or the like, there is a problem that communication between nodes whose connection is normal cannot be performed. Further, even when all the slave nodes can be substituted for the master node, communication for control is required between the master node and each slave node, and there is a disadvantage that the amount of control information increases.
【０００４】[0004]
【発明の目的】本発明は、かかる従来例の有する不都合
を改善し、とくに、伝送路のいずれの箇所に障害が生じ
ても正常に接続されているノード間については、その通
信を有効に維持し得る二重化ループネットワークシステ
ムを提供することを、その目的とする。SUMMARY OF THE INVENTION The present invention provides such a conventional example improving the disadvantages possessed by, in particular, for the inter-node failure the portion of the Re not have a transmission line is properly connected even if, enable the communication It is an object of the present invention to provide a duplicated loop network system that can be maintained in a network.
【０００５】[0005]
【課題を解決するための手段】本発明では、所定の制御
情報を送出するマスタノードと制御情報を受信し且つ送
出する複数のスレーブノードとを、第１の伝送路を介し
てループ状に接続すると共に、この第１の伝送路に第２
の伝送路を併設してなる二重化ネットワークシステムに
おいて、各々スレーブノードは、必要に応じて伝送路の
切り替えを行なう伝送路切替機能と、制御情報の無入力
時に，受信障害信号を出力する受信障害信号出力機能
と、この受信障害信号に基づいて自己発振を行ない，外
部に対してクロック信号を出力するクロック信号出力機
能とを備えるとともに、前記第１の伝送路及び前記第２
の伝送路の両方から前記マスターノードからの制御情報
が受信される場合、前記第１の伝送路のクロックに従属
し、前記第１の伝送路又は前 記第２の伝送路の一方から
のみ前記マスターノードからの制御情報が受信される場
合、当該一方の伝送路のクロックに従属し、前記第１の
伝送路及び前記第２の伝送路の両方から前記マスターノ
ードからの制御情報が受信されず当該第１の伝送路が正
常である場合、当該第１の伝送路のクロックに従属し、
前記第１の伝送路及び前記第２の伝送路の両方のから前
記マスタノードからの制御情報が受信されず当該第１の
伝送路が障害である場合、自己発信クロックで動作す
る、という構成を採っている。これによって前述した目
的を達成しようとするものである。According to the present invention, a master node for transmitting predetermined control information and a plurality of slave nodes for receiving and transmitting the control information are connected in a loop via a first transmission line. And the second transmission line
In a redundant network system having transmission lines of the same type, each slave node has a transmission line switching function of switching transmission lines as needed, and a reception failure signal for outputting a reception failure signal when control information is not input. An output function, a clock signal output function of performing self-oscillation based on the reception failure signal and outputting a clock signal to the outside, and the first transmission path and the second transmission path.
Control information from the master node from both transmission paths
Is received, it is dependent on the clock of the first transmission line.
And, from one of the first transmission channel or the previous SL second transmission line
Only when control information from the master node is received
If the first transmission line is dependent on the clock of the one transmission path,
The master node is transmitted from both the transmission path and the second transmission path.
No control information is received from the
If it is always, it depends on the clock of the first transmission path,
From both the first transmission path and the second transmission path
The control information from the master node is not received and the first
If the transmission line is faulty, it operates with its own clock.
That adopts a configuration that. This aims to achieve the above-mentioned object.
【０００６】[0006]
【実施例】以下、本発明の一実施例を図１ないし図３に
基づいて説明する。この図１ないし図３に示す実施例
は、所定の制御情報を送出するマスタノードＭと制御情
報を受信し且つ送出する複数のスレーブノードＳ１ ，
Ｓ２ ，・・・，Ｓ４ とを、第１の伝送路としての０
系伝送路１を介してループ状に接続すると共に、この第
１の伝送路１に第２の伝送路としての１系伝送路２が併
設されている。各々スレーブノードＳ１ 〜Ｓ４ は、
必要に応じて伝送路の切り替えを行なう伝送路切替機能
と、制御情報の無入力時に，受信障害信号を出力する受
信障害信号出力機能と、この受信障害信号に基づいて自
己発振を行ない，外部に対してクロック信号を出力する
クロック信号出力機能とを備えている。BRIEF DESCRIPTION based <br/> an embodiment of the present invention in FIGS. The embodiment shown in FIGS. 1 to 3 has a master node M for transmitting predetermined control information and a plurality of slave nodes S1,.
, S4 are defined as 0 as the first transmission path.
The first transmission line 1 is connected to a first transmission line 2 as a second transmission line while being connected in a loop via the system transmission line 1. Slave nodes S1 to S4 are respectively:
A transmission line switching function for switching the transmission line as required, a reception failure signal output function for outputting a reception failure signal when control information is not input, and a self-oscillation based on the reception failure signal, and And a clock signal output function of outputting a clock signal.
【０００７】これを更に詳述する。図１において、Ｍは
マスタノード、Ｓ１，Ｓ２，Ｓ３，Ｓ４はスレーブノー
ドを示す。マスタノードＭは、０系，１系両方の伝送路
へ制御情報を送出する。０系，１系全て正常であるの
で、全てのスレーブノードは０系，１系の両方の系から
制御情報を受信できるので各スレーブノードは０系の伝
送路のクロックに従属する。図中、ＣＬはクロック発生
源、○印はクロック従属の選択先を示す。This will be described in more detail. In FIG. 1, M indicates a master node, and S1, S2, S3, and S4 indicate slave nodes. The master node M sends control information to both the 0-system and 1-system transmission lines. Since all the 0-system and 1-system are normal, all the slave nodes can receive control information from both the 0-system and the 1-system. Therefore, each slave node is subordinate to the clock of the 0-system transmission line. In the figure, CL indicates a clock generation source, and ○ indicates a clock-dependent selection destination.
【０００８】図２は、スレーブノードＳ１，Ｓ２間の伝
送路が異常となった状態のシステム図である。ここで、
スレーブノードＳ２，Ｓ３，Ｓ４は、０系の伝送路から
制御情報が受信されなくなり、１系の伝送路からは制御
情報が受信されるので１系の伝送路のクロックに従属す
る。スレーブノードＳ１は０系の伝送路から制御情報が
受信され、１系の伝送路からは制御情報は受信されない
ので、０系の伝送路のクロックに従属する。FIG. 2 is a system diagram showing a state where the transmission path between the slave nodes S1 and S2 has become abnormal. here,
The slave nodes S2, S3, and S4 receive the control information from the transmission line of the system 0 and receive the control information from the transmission line of the system 1, and thus are slaved to the clock of the transmission line of the system 1. Since the slave node S1 receives control information from the transmission line of the 0 system and does not receive control information from the transmission line of the 1 system, the slave node S1 is dependent on the clock of the transmission line of the 0 system.
【０００９】図３は、スレーブノードＳ１，Ｓ２間の伝
送路とスレーブノードＳ３，Ｓ４間の伝送路の２ケ所が
異常となった状態のシステム図である。スレーブノード
Ｓ１は０系の伝送路からのみ制御情報が受信されるの
で、０系の伝送路のクロックに従属し、スレーブノード
Ｓ４は、１系の伝送路からのみ制御情報が受信されるの
で、１系の伝送路のクロックに従属する。また、スレー
ブノードＳ２，Ｓ３では０系，１系の両方の伝送路から
制御情報が受信できず、スレーブノードＳ２は０系伝送
路の受信障害を発生しているので内部クロック動作をす
る。又スレーブノードＳ３は、０系伝送路の受信障害は
発生していないので、０系伝送路のクロックに従属す
る。このように、２ケ所に障害が発生した時でも、正常
な伝送路間での通信は正常に行える。FIG. 3 is a system diagram showing a state where two transmission lines between the slave nodes S1 and S2 and the transmission line between the slave nodes S3 and S4 are abnormal. Since the slave node S1 receives control information only from the 0-system transmission line, it is dependent on the clock of the 0-system transmission line, and the slave node S4 receives control information only from the 1-system transmission line. It depends on the clock of the transmission line of the first system. In addition, the slave nodes S2 and S3 cannot receive control information from both the 0-system and 1-system transmission lines, and the slave node S2 performs an internal clock operation because a reception failure has occurred in the 0-system transmission line. The slave node S3 is subordinate to the clock of the 0-system transmission line because no reception failure has occurred in the 0-system transmission line. In this way, even when a failure occurs at two locations, communication between normal transmission paths can be performed normally.
【００１０】[0010]
【発明の効果】以上説明したように、本発明によると、
マスタノードからの制御情報を増やすことなく全スレー
ブノードがクロック発生源としてのマスタノードの代行
処理が行えることから、どの箇所の伝送路が障害となっ
ても、伝送路が正常状態で接続されているノード間の通
信は正常に行うことができるという従来にない優れた二
重化ループネットワークシステムを提供することができ
る。As described above, according to the present invention,
Since all slave nodes can substitute for the master node as a clock generation source without increasing the control information from the master node, the transmission path can be connected in a normal state even if any part of the transmission path fails. It is possible to provide an unprecedented superior duplex loop network system in which communication between existing nodes can be performed normally.
【図１】本発明の一実施例を示す正常状態のシステム図
である。FIG. 1 is a system diagram showing a normal state according to an embodiment of the present invention.
【図２】図１において１ケ所の伝送路が異常となった場
合の状態を示すシステム図である。FIG. 2 is a system diagram showing a state in which one transmission line in FIG. 1 becomes abnormal.
【図３】図１において２ケ所の伝送路に異常が生じた場
合の状態を示すシステム図である。FIG. 3 is a system diagram showing a state when an abnormality occurs in two transmission paths in FIG. 1;
１ 第１の伝送路としての０系伝送路 ２ 第２の伝送路としての１系伝送路 Ｍ マスタノード Ｓ１，Ｓ２，Ｓ３，Ｓ４ スレーブノード 1 0-system transmission line as first transmission line 2 1-system transmission line as second transmission line M Master node S1, S2, S3, S4 Slave node
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−227177（ＪＰ，Ａ) 特開 平５−22328（ＪＰ，Ａ) 特開 平３−207138（ＪＰ，Ａ) 特開 平３−117245（ＪＰ，Ａ) 特開 平２−86238（ＪＰ，Ａ) 特開 平１−177738（ＪＰ，Ａ) 特開 昭63−7055（ＪＰ，Ａ) 特開 昭61−144942（ＪＰ，Ａ) 特開 昭59−183553（ＪＰ，Ａ) 特許2833281（ＪＰ，Ｂ２) 電子情報通信学会技術研究報告，ＩＮ 91−102，横山幸雄 他，「ＦＤＤＩ− ▲ＩＩ▼サイクル同期方式の検討」，ｐ ａｇｅｓ．61−66 (58)調査した分野(Int.Cl.6，ＤＢ名) H04L 12/437 H04L 7/00 ＪＩＣＳＴファイル（ＪＯＩＳ)────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-227177 (JP, A) JP-A-5-22328 (JP, A) JP-A-3-207138 (JP, A) JP-A-3-207138 117245 (JP, A) JP-A-2-86238 (JP, A) JP-A 1-177738 (JP, A) JP-A-63-7555 (JP, A) JP-A-61-144942 (JP, A) JP-A-59-183553 (JP, A) Patent 2832881 (JP, B2) IEICE Technical Report, IN 91-102, Yukio Yokoyama et al. . 61-66 (58) Field surveyed (Int. Cl. 6 , DB name) H04L 12/437 H04L 7/00 JICST file (JOIS)
Claims (1)
と前記制御情報を受信し且つ送出する複数のスレーブノ
ードとを、第１の伝送路を介してループ状に接続すると
共に、この第１の伝送路に第２の伝送路を併設してなる
二重化ネットワークシステムにおいて、 前記各々スレーブノードは、 必要に応じて伝送路の切り替えを行なう伝送路切替機能
と、前記制御情報の無入力時に，受信障害信号を出力す
る受信障害信号出力機能と、この受信障害信号に基づい
て自己発振を行ない，外部に対してクロック信号を出力
するクロック信号出力機能とを備えるとともに、前記第１の伝送路及び前記第２の伝送路の両方から前記
マスターノードからの制御情報が受信される場合、前記
第１の伝送路のクロックに従属し、 前記第１の伝送路又は前記第２の伝送路の一方からのみ
前記マスターノードからの制御情報が受信される場合、
当該一方の伝送路のクロックに従属し、 前記第１の伝送路及び前記第２の伝送路の両方から前記
マスターノードからの制御情報が受信されず当該第１の
伝送路が正常である場合、当該第１の伝送路のクロック
に従属し、 前記第１の伝送路及び前記第２の伝送路の両方のから前
記マスタノードからの制御情報が受信されず当該第１の
伝送路が障害である場合、自己発信クロックで動作す
る、 ことを特徴とする二重化ループネットワークシステム。A master node for transmitting predetermined control information and a plurality of slave nodes for receiving and transmitting the control information are connected in a loop via a first transmission line. In a duplicated network system in which a second transmission line is provided along with a transmission line, each of the slave nodes has a transmission line switching function of switching a transmission line as necessary, and a reception failure when no control information is input. a reception failure signal output function of outputting a signal, performs self-oscillating based on the received fault signal, Rutotomoni a clock signal output function for outputting a clock signal to the external, said first transmission line and the From both of the second transmission paths
When control information from the master node is received,
Dependent on the clock of the first transmission line, only from one of the first transmission line or the second transmission line
When control information from the master node is received,
Dependent on the clock of the one transmission line, the first transmission line and the second transmission line
The control information from the master node is not received and the first
If the transmission path is normal, the clock of the first transmission path
And is dependent on both the first transmission path and the second transmission path.
The control information from the master node is not received and the first
If the transmission line is faulty, it operates with its own clock.
That, redundant loop network system, characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4078964A JP2884897B2 (en) | 1992-02-29 | 1992-02-29 | Redundant loop network system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4078964A JP2884897B2 (en) | 1992-02-29 | 1992-02-29 | Redundant loop network system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05244185A JPH05244185A (en) | 1993-09-21 |
| JP2884897B2 true JP2884897B2 (en) | 1999-04-19 |
Family
ID=13676585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4078964A Expired - Lifetime JP2884897B2 (en) | 1992-02-29 | 1992-02-29 | Redundant loop network system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2884897B2 (en) |
-
1992
- 1992-02-29 JP JP4078964A patent/JP2884897B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 電子情報通信学会技術研究報告，ＩＮ９１−１０２，横山幸雄 他，「ＦＤＤＩ−▲ＩＩ▼サイクル同期方式の検討」，ｐａｇｅｓ．６１−６６ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05244185A (en) | 1993-09-21 |
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