JPS60107951A - Transmission system - Google Patents
Transmission systemInfo
- Publication number
- JPS60107951A JPS60107951A JP21405283A JP21405283A JPS60107951A JP S60107951 A JPS60107951 A JP S60107951A JP 21405283 A JP21405283 A JP 21405283A JP 21405283 A JP21405283 A JP 21405283A JP S60107951 A JPS60107951 A JP S60107951A
- Authority
- JP
- Japan
- Prior art keywords
- master device
- polling request
- stopped
- transmission path
- master
- 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.)
- Pending
Links
Classifications
-
- 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]
- H04L12/42—Loop networks
- H04L12/423—Loop networks with centralised control, e.g. polling
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
【発明の詳細な説明】
（技術分野）
本発明は複数台の装置と伝送路を有しマスター装置のポ
ーリング要求に応じて各装置が、データを伝送路にデー
タを送出するデータ伝送システムに関するものである。[Detailed Description of the Invention] (Technical Field) The present invention relates to a data transmission system having a plurality of devices and a transmission path, in which each device sends data to the transmission path in response to a polling request from a master device. It is.
（背景技術）
従来の方式では、マスター装置は特定の装置に限定され
ており、マスター装置が停止状態になるとシステム全体
が停止するという欠点があった。(Background Art) In the conventional system, the master device is limited to a specific device, and when the master device becomes stopped, the entire system stops.
第１図において装置Ｎｏ １を、マスター装置とすると
、装置Ｎｏ １より順次装置Ｎ０２．装置Ｎｏ３とデー
タをループ伝送しているが装置Ｎｏ １が停止するとポ
ーリング要求を出力する装置がなくなるのでシステム全
体として停止状態となる。In FIG. 1, if device No. 1 is the master device, devices No. 1 to No. 1 will be sequentially installed. Although data is being transmitted in a loop with device No. 3, if device No. 1 stops, there will be no device to output polling requests, so the entire system will be in a stopped state.
（発明の課題）
、本発明はこれらの欠点を解決するために、マスター装
置となれる要素を全ての装置にもたせておりシステム全
体としての停止状態になる事を防ぐ事を目的としたもの
であり以下に詳細に説明する（発明の構成および作用）
第１図及び第２図に従って詳細な実行手順を説明する。(Problems to be solved by the invention) In order to solve these drawbacks, the present invention provides all devices with an element that can serve as a master device, and aims to prevent the system as a whole from coming to a halt. Detailed explanation below (Structure and operation of the invention) A detailed execution procedure will be explained according to FIGS. 1 and 2.
第１図より正常時は装置Ｎｏ １よりポーリング要求が
出□力されており各装置で自装置のポーリング要求を受
信して、自装置のデータを出力している。装置Ｎｏ １
が停止状態となった場合、第２図で示す装置Ｎｏ２〜装
置Ｎｏｎのうち監視時間の最も短い装置Ｎｏ ２が時間
監視エラーを検出し自らがマスター装置となりポーリン
グを各装置に出力する事を開始する。以下同様に装置Ｎ
ｏ ｎ −１が停止状態・になれば装置Ｎｏ ｎが時間
監視エラーを検出して、マスター装置となりｎ個所で、
マスター装置となる事が可能である。また、マスター装
置が他装置よりのポーリングを受信した場合、自装置を
スレーブにする事により複数個の装置が同時に、マスタ
ー装置になり続ける事を防いでいる。As shown in FIG. 1, during normal operation, a polling request is output from device No. 1, and each device receives its own polling request and outputs its own data. Equipment No. 1
When the device is stopped, device No. 2, which has the shortest monitoring time among devices No. 2 to No. shown in Figure 2, detects a time monitoring error and becomes the master device and starts outputting polling signals to each device. do. Similarly, device N
If O n -1 becomes stopped, device No. n detects a time monitoring error and becomes the master device at n locations.
It is possible to become a master device. Furthermore, when the master device receives polling from another device, it makes itself a slave to prevent multiple devices from simultaneously becoming the master device.
（発明の効果）
以上説明したように、マスター装置が停止状態になった
場合、残りの装置中、最も監視時の短い。 装置がマス
ター装置となれるので、マスター装置が停止状態に陥い
っても装置全体として停止する事がないという利点があ
る。(Effects of the Invention) As explained above, when the master device is in a stopped state, it has the shortest monitoring time among the remaining devices. Since the device can function as a master device, there is an advantage that even if the master device falls into a stopped state, the device as a whole will not stop.
本発明はループネットワークシステムにおいて、全ての
装置でマスター装置となれる要素を持っているので、マ
スター装置が停止状態に陥ってもシステム全体として停
止状態に陥ることがない利点があるので、各々の装置を
ループ状に接続した情− 報通信システムに利用できる
。In a loop network system, the present invention has an element that allows all devices to function as a master device, so even if the master device is stopped, the system as a whole will not be stopped. It can be used for information and communication systems that connect the two in a loop.
第１図はループネットワークの構成図、第２図はポーリ
ング時間間隔と各装置での監視時間の関係を示す図であ
る。
特許出願人
沖電気工業株式会社
特許出願代理人
弁理士 山 本 恵 −FIG. 1 is a diagram showing the configuration of a loop network, and FIG. 2 is a diagram showing the relationship between polling time intervals and monitoring times in each device. Patent applicant Oki Electric Industry Co., Ltd. Patent application agent Megumi Yamamoto −
Claims (2)
に結合するデータ伝送路を有し、複数台の装置のうち伝
送路の管理権を有するマスター装置のポーリング要求に
応じて各装置が伝送路にデータを送出するデータ伝送シ
ステムにおいて、伝送路の管理権を有さないスレーブ装
置で、あらかじめ設定された条件に合致した場合にのみ
、マスター装置が伝送路の管理権を放棄したと判断し、
伝送路の管理権を得、マスター装置となることにより、
任意の装置が、マスター装置、あるいはスレーブ装置と
なり得ることを特徴とする伝送方式。(1) It has multiple data transmitting/receiving devices and a data transmission path that connects each device in a loop, and each device responds to a polling request from a master device that has the right to manage the transmission path among the multiple devices. In a data transmission system that sends data to a transmission path, a slave device that does not have the right to manage the transmission path determines that the master device has relinquished the right to manage the transmission path only when preset conditions are met. death,
By gaining control of the transmission line and becoming the master device,
A transmission method characterized in that any device can act as a master device or a slave device.
上時及びマスター装置よりのポーリング要求を受信した
時点より監視時間（Ｔｉ）経過前にマスター装置からの
ポーリング要求がない場合であることを特徴とする特許
請求の範囲第１項記載の伝送方式。(2) The condition set above is when there is no polling request from the master device before the monitoring time (Ti) elapses from the time the device is started up and the polling request from the master device is received. A transmission system according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21405283A JPS60107951A (en) | 1983-11-16 | 1983-11-16 | Transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21405283A JPS60107951A (en) | 1983-11-16 | 1983-11-16 | Transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60107951A true JPS60107951A (en) | 1985-06-13 |
Family
ID=16649462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21405283A Pending JPS60107951A (en) | 1983-11-16 | 1983-11-16 | Transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60107951A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61208332A (en) * | 1985-03-12 | 1986-09-16 | Oki Electric Ind Co Ltd | System rising method for data transmission system |
| JPH01170142A (en) * | 1987-12-25 | 1989-07-05 | Iwatsu Electric Co Ltd | Data transmission system |
-
1983
- 1983-11-16 JP JP21405283A patent/JPS60107951A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61208332A (en) * | 1985-03-12 | 1986-09-16 | Oki Electric Ind Co Ltd | System rising method for data transmission system |
| JPH01170142A (en) * | 1987-12-25 | 1989-07-05 | Iwatsu Electric Co Ltd | Data transmission system |
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