JPH05244185A - Duplex loop network system - Google Patents
Duplex loop network systemInfo
- Publication number
- JPH05244185A JPH05244185A JP4078964A JP7896492A JPH05244185A JP H05244185 A JPH05244185 A JP H05244185A JP 4078964 A JP4078964 A JP 4078964A JP 7896492 A JP7896492 A JP 7896492A JP H05244185 A JPH05244185 A JP H05244185A
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- control information
- network system
- slave nodes
- output function
- 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)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
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 dual loop network system, and more particularly to a dual loop network system adopting 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 that can act on behalf of a master node as a clock generation source is limited, and the slave nodes that can act on behalf and the master node communicate with each other. The method 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 method,
In the case of a configuration of only slave nodes that cannot act as a master node due to a failure in a transmission line or the like, there is a problem in that communication between nodes whose connection is normal cannot be performed. Further, even if all the slave nodes can be substituted for the master node, communication for control is required between the master node and each slave node, which has a drawback 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、伝送路のいづ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。It is an object of the present invention to improve the inconvenience of the conventional example, and particularly to effectively maintain the communication between normally connected nodes even if a failure occurs in any part of the transmission path. It is an object of the present invention to provide a duplex loop network system that can be used.
【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が、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、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 that sends predetermined control information and a plurality of slave nodes that receive and send control information are connected in a loop via a first transmission line. The second transmission line on the first transmission line.
In a duplicated network system in which the transmission lines are installed side by side, each slave node has a transmission line switching function that switches the transmission lines as needed, and a reception fault signal that outputs a reception fault signal when no control information is input. The configuration is such that it has an output function and a clock signal output function that performs self-oscillation based on this reception failure signal and outputs a clock signal to the outside. 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の
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。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. The embodiment shown in FIGS. 1 to 3 includes a master node M which sends predetermined control information and a plurality of slave nodes S 1 which receive and send control information.
S 2, · · ·, of the S 4, with through 0-system transmission line 1 as the first transmission path is connected in a loop, as the second transmission line to the transmission line 1 of the first 1 A system transmission line 2 is installed side by side. Each of the slave nodes S 1 to S 4 has a transmission path switching function for switching the transmission path as necessary, a reception failure signal output function for outputting a reception failure signal when no control information is input, and this reception failure signal. It has a clock signal output function that self-oscillates based on the above and outputs a clock signal to the outside.
【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 is a master node and S1, S2, S3 and S4 are slave nodes. The master node M sends control information to both the 0-system and 1-system transmission paths. Since the 0-system and 1-system are all normal, all slave nodes can receive control information from both the 0-system and 1-system, so that each slave node is subordinate to the clock of the 0-system transmission path. In the figure, CL indicates a clock generation source, and a circle 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 in which the transmission path between the slave nodes S1 and S2 has become abnormal. here,
The slave nodes S2, S3, and S4 are dependent on the clock of the 1-system transmission line because the control information is not received from the 0-system transmission line and the control information is received from the 1-system transmission line. Since the slave node S1 receives the control information from the 0-system transmission line and does not receive the control information from the 1-system transmission line, it is dependent on the clock of the 0-system transmission line.
【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 in which the transmission path between the slave nodes S1 and S2 and the transmission path between the slave nodes S3 and S4 are abnormal in two places. Since the slave node S1 receives the control information only from the 0-system transmission line, it depends on the clock of the 0-system transmission line, and the slave node S4 receives the control information only from the 1-system transmission line. Depends on the clock of the 1-system transmission line. Further, 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 operates as an internal clock because the 0-system transmission line has a reception failure. Further, the slave node S3 is subordinate to the clock of the 0-system transmission line because the reception failure of the 0-system transmission line has not occurred. In this way, even when a failure occurs in two places, communication between normal transmission lines 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,
All slave nodes can perform processing on behalf of the master node as a clock generation source without increasing control information from the master node, so that no matter which part of the transmission line fails, the transmission line is connected in a normal state. It is possible to provide an unprecedented excellent duplex loop network system in which communication between existing nodes can be normally performed.
【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 in a normal state showing 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 in which an abnormality has occurred in two transmission lines in FIG.
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 system 0 transmission line as a first transmission line 2 system 1 transmission line as a second transmission line M master node S1, S2, S3, S4 slave node
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
ブノードが、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ている
ことを特徴とする二重化ループネットワークシステム。1. A master node that sends predetermined control information and a plurality of slave nodes that receive and send the control information are connected in a loop via a first transmission line, and the first node In a duplicated network system in which a second transmission path is provided along with a transmission path, each slave node switches a transmission path as needed, and a reception failure when the control information is not input. A duplex loop network system having a reception failure signal output function for outputting a signal and a clock signal output function for performing self-oscillation based on the reception failure signal and outputting a clock signal to the outside. .
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 true JPH05244185A (en) | 1993-09-21 |
| JP2884897B2 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
Also Published As
| Publication number | Publication date |
|---|---|
| JP2884897B2 (en) | 1999-04-19 |
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