JPS6159941A - Terminal control system of multi-drop connection - Google Patents

Terminal control system of multi-drop connection

Info

Publication number
JPS6159941A
JPS6159941A JP59182001A JP18200184A JPS6159941A JP S6159941 A JPS6159941 A JP S6159941A JP 59182001 A JP59182001 A JP 59182001A JP 18200184 A JP18200184 A JP 18200184A JP S6159941 A JPS6159941 A JP S6159941A
Authority
JP
Japan
Prior art keywords
terminal
master station
terminal device
fault
calls
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
Application number
JP59182001A
Other languages
Japanese (ja)
Inventor
Tadashi Fukunaga
正 福永
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP59182001A priority Critical patent/JPS6159941A/en
Publication of JPS6159941A publication Critical patent/JPS6159941A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To attain stable service by decreasing number of callings to a terminal device whose fault is confirmed once so as to avoid the limit to polling/selection even at a fault of the terminal device. CONSTITUTION:A network control program 11 brings a flag corresponding to a faulty terminal device in a terminal management table 4 to '1' level when a terminal fault is discriminated at polling/selection. Similarly,the network control program 11 has a retrial table 6. Number of retrials at normal/faulty state of each terminal device is given to the retrial table 6 and the number of retrials is decreased to a terminal device confirmed for a fault.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、親局に接続された同一回線に複数の端末がマ
ルチドロップ接続され、該親局よりポーリング、セレク
ティング方式で該端末を呼び出し、親局と端末間の通信
を行う方式における端末の制御方式に係る。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a system in which a plurality of terminals are multi-drop connected to the same line connected to a master station, and the master station calls the terminals using a polling and selecting method. , relates to a terminal control method in a method for communicating between a master station and a terminal.

〔従来の技術〕[Conventional technology]

第２図に本発明を適用するマルチドロップ接続の概念図
を示す。FIG. 2 shows a conceptual diagram of a multi-drop connection to which the present invention is applied.

図において、１は親局、２は端末群、３は回線、１１は
通信制御を行うネットワーク制御プログラム、１２はネ
ットワーク制御プログラムを制御するホストコンピュー
タ、１３はホストコンピュータに指示を与えるセンター
コンソーμ、２１〜２３はそれぞれ端末を示す。In the figure, 1 is a master station, 2 is a terminal group, 3 is a line, 11 is a network control program that controls communication, 12 is a host computer that controls the network control program, 13 is a center console μ that gives instructions to the host computer; 21 to 23 each indicate a terminal.

かかる溝底において、動作の概要は次の通シでるる。The outline of the operation in such a groove bottom is as follows.

親局１より２１〜２３で示した端末に対し、所定の順番
で端末を呼び出す。The master station 1 calls the terminals 21 to 23 in a predetermined order.

呼び出された端末は、親局からの呼び出しに応答し、親
局との間で通信回線が設定され、テ゛−タのやυとりを
行う。The called terminal responds to the call from the master station, sets up a communication line with the master station, and exchanges data.

こうして、それぞれの端末は親局１よりサイクリノクに
呼び出され、親局との通信を行う。In this way, each terminal is called by the master station 1 and communicates with the master station.

ところが、端末に障害が生起した場合、親局からの端末
の呼び出しに際し、端末からの応答がないため、親局か
ら当該端末の障害を確認するためにＭｉ数回、呼び出し
を繰シ返す。そして所定回数だけ繰υ返して呼び出した
のち、あらかじめ定められた回数だけ応答がない場合に
、白該端末を障害とみなす。However, when a failure occurs in the terminal, there is no response from the terminal when the master station calls the terminal, so the call is repeated Mi several times from the master station to confirm the failure of the terminal. Then, if there is no response for a predetermined number of times after repeatedly calling the terminal a predetermined number of times, the terminal is deemed to be at fault.

ここに、くシ返しの回数を例えば７回、１回の呼び出し
に要する時間を１．２秒とすると、障害を確認するまで
８．４秒を要することになる。Here, if the number of repeats is 7 times and the time required for one call is 1.2 seconds, it will take 8.4 seconds to confirm the failure.

ところで、従来の方式の場合、親局からの端末の呼び出
しく際しては、正常な端末も障害中の端末も区別なしに
サイクリックに呼び出していた。By the way, in the case of the conventional system, when a terminal is called from a master station, both normal terminals and faulty terminals are called cyclically without distinction.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

すなわち、親局１より端末２１→２２→２８と呼び出し
たのち、再び端末ｚ１→２２→２３の順に呼び出す。That is, the master station 1 calls the terminals 21, 22, and 28, and then calls the terminals z1, 22, and 23 again in this order.

ここで、端末２２が障害であった場合、親局は端末２２
の呼び出しの順番がまわってくる毎に端末２２に対し、
所定回数の呼び出しを行うことになる。Here, if the terminal 22 is at fault, the master station
to the terminal 22 every time it is the turn to call
A predetermined number of calls will be made.

従って、端末２１．２１についてみれば、親局が障害端
末２２に拘束てれる分、ポーリングの回数が少くなり、
親局との通信量が減少することになる。Therefore, when looking at the terminals 21 and 21, the number of polling decreases because the master station is tied to the failed terminal 22.
The amount of communication with the master station will decrease.

〔問題点を解決するための手段〕[Means for solving problems]

本発明においては、上述のような従来技術の問題点を解
決するため、一度障害を確認した端末に対しては、その
呼び出し回数を減少させるものである。In order to solve the problems of the prior art as described above, the present invention reduces the number of calls made to a terminal once a failure has been confirmed.

〔作用〕[Effect]

すなわち、一度障害が確認された端末に対しては、復旧
するまでは、親局からの呼び出しの回数を減少させるた
め、正常な端末に対するポーリング、センクテイノグ動
作回数を制限される程度が緩和されることになる。In other words, for terminals once a failure has been confirmed, the degree of restriction on the number of polling and sensing operations for normal terminals will be relaxed in order to reduce the number of calls from the master station until the terminal recovers. become.

〔実施例〕〔Example〕

以下、本発明の詳細な説明する。 The present invention will be explained in detail below.

第１図に本発明の実施例を示す。FIG. 1 shows an embodiment of the present invention.

図において、８は回線、４は端末管理テーブル、５はア
プリケ−シリンプログツム、６はリトライテープル、１
１はネットワーク制御プログラム、１２はホストコンピ
ュータ、１３はセンターコンソールである。In the figure, 8 is a line, 4 is a terminal management table, 5 is an application program, 6 is a retry table, 1
1 is a network control program, 12 is a host computer, and 13 is a center console.

ネットワーク制御プログラム１１は、ポーリング、セレ
ノティング時に、端末障害と判断すると、端末管理テー
プＡ／４の障害端末の対応フラグを“１″とする。When the network control program 11 determines that there is a terminal failure during polling and serenoting, it sets the corresponding flag of the failed terminal on the terminal management tape A/4 to "1".

同様に、ネットワーク制御プログラム１１はリトライテ
ープ／Ｉ／６をもつり 第４口拡、リトライテープμの内容を示したもので、各
々の端末における呼び出しのくシ返し回数が書き込まれ
ている。Similarly, the network control program 11 includes a retry tape /I/6 and shows the contents of a fourth retry tape μ, in which the number of times calls are repeated at each terminal is written.

本例においては、正常時７回、障害時２回としているが
、これは所定回数を設定できるものとする。In this example, the number of times is 7 times during normal operation and 2 times when there is a failure, but it is assumed that a predetermined number of times can be set.

さて、本実施例の場合、端末２１．２３が正常。Now, in the case of this embodiment, terminals 21 and 23 are normal.

２２が異常でオ）、第３図に示した端末管理テーブルの
端末２１の対応フラグを“１′”とする。22 is abnormal (e), the corresponding flag of the terminal 21 in the terminal management table shown in FIG. 3 is set to "1'".

第４図図示のりトライテープμには、それぞれの端末の
正常時、障害時のりトライ回数が指示されているが、今
、端末管理テープμの端末２２のフラグが“１”である
ことから、障害時のリトライ回数２を採用する。The try tape μ shown in FIG. 4 indicates the number of tries for each terminal when it is normal and when there is a failure, but since the flag for the terminal 22 on the terminal management tape μ is currently “1”, The number of retries at the time of failure is 2.

従って、障害が確認された後の親局から端局２２に対す
る呼び出しの回数は２回となる。Therefore, the number of calls from the master station to the terminal station 22 after the failure is confirmed is two.

一方、障害が復旧した場合、端末管理テープμの端末２
２に対応する７フグは“°Ｏ″となシ、次回の障害時は
ＩＪ）ブイ回数７となる。On the other hand, if the failure is recovered, terminal 2 of terminal management tape μ
7 blowfish corresponding to 2 will be "°O", and the next failure will be IJ) buoy count 7.

〔発明の効果〕〔Effect of the invention〕

本発明によると、端末の障害時でもポーリング、セレク
ティング動作を大きく制限されることなく、安定したサ
ービスを行うことができる。According to the present invention, even when a terminal fails, polling and selecting operations are not significantly restricted, and stable services can be provided.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の実施例、ＭＳ２図は本発明を適用する
システムの概念図、第３図は管理テープμの書き込み例
、第４図はりトライテープｐの書き込み例である。 図において、ｌは親局、２は端末群、３は回線。 ４は端末管理テープμ、５はアプリケーン譚ンデログツ
ム、６はリドグイテーブル、１１はネットワーク制御プ
ログラム、１２はホストコンピュータ、１８はセンター
コンソーμヲ示ス。 第　１　図 乙 第２図FIG. 1 is an embodiment of the present invention, FIG. 2 is a conceptual diagram of a system to which the present invention is applied, FIG. 3 is an example of writing to a management tape μ, and FIG. 4 is an example of writing to a try tape p. In the figure, l is a master station, 2 is a terminal group, and 3 is a line. Reference numeral 4 indicates the terminal management tape μ, 5 indicates the application terminal log, 6 indicates the read/write table, 11 indicates the network control program, 12 indicates the host computer, and 18 indicates the center console μ. Figure 1 Figure B Figure 2

Claims (1)

【特許請求の範囲】[Claims] 親局に接続された同一回線に複数の端末がマルチドロッ
プ接続され、該親局よりポーリング、セレクティング方
式で該端末を呼び出し、該親局と該端末間の通信を行い
、該端末の障害時には該親局より該端末に対して所定回
数呼び出しを行い、呼び出し回数があらかじめ定められ
た回数に達すると当該端末を障害とみなす方式において
、当該端末の障害検知以後は、該あらかじめ定められた
回数を減少させることを特徴とするマルチドロップ接続
端末制御方式。Multiple terminals are multi-drop connected to the same line connected to a master station, the master station calls the terminal using polling and selecting methods, and communication between the master station and the terminal is performed, and in the event of a failure of the terminal, In this method, the master station calls the terminal a predetermined number of times, and when the number of calls reaches a predetermined number, the terminal is considered to be at fault. A multi-drop connection terminal control method characterized by reducing the number of connections.
JP59182001A 1984-08-30 1984-08-30 Terminal control system of multi-drop connection Pending JPS6159941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59182001A JPS6159941A (en) 1984-08-30 1984-08-30 Terminal control system of multi-drop connection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59182001A JPS6159941A (en) 1984-08-30 1984-08-30 Terminal control system of multi-drop connection

Publications (1)

Publication Number Publication Date
JPS6159941A true JPS6159941A (en) 1986-03-27

Family

ID=16110584

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59182001A Pending JPS6159941A (en) 1984-08-30 1984-08-30 Terminal control system of multi-drop connection

Country Status (1)

Country Link
JP (1) JPS6159941A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6478053A (en) * 1987-09-18 1989-03-23 Fujitsu Ltd Device for detecting fault of network
JPH01256244A (en) * 1988-04-05 1989-10-12 Fujitsu Ltd Fault processing system in multi-drop line
JPH02127838A (en) * 1988-11-08 1990-05-16 Nec Corp Information transmission system
JPH02135941A (en) * 1988-11-17 1990-05-24 Nec Eng Ltd Monitoring device for system down of work station
JPH03158035A (en) * 1989-11-15 1991-07-08 Matsushita Electric Works Ltd Time division multiplex transmission system
JPH03198549A (en) * 1989-12-27 1991-08-29 Mitsubishi Electric Corp Multi-point monitor system
JPH03241942A (en) * 1990-02-20 1991-10-29 Mitsubishi Electric Corp Data communication system
JPH04100839U (en) * 1991-02-05 1992-09-01 富士重工業株式会社 composite structure
WO2019122589A1 (en) * 2017-12-21 2019-06-27 Psa Automobiles Sa Device for supervising slave member faults for a master member of a multiplexed network

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6478053A (en) * 1987-09-18 1989-03-23 Fujitsu Ltd Device for detecting fault of network
JPH01256244A (en) * 1988-04-05 1989-10-12 Fujitsu Ltd Fault processing system in multi-drop line
JP2529995B2 (en) * 1988-04-05 1996-09-04 富士通株式会社 Failure handling method for multi-drop line
JPH0695679B2 (en) * 1988-11-08 1994-11-24 日本電気株式会社 Information transmission method
JPH02127838A (en) * 1988-11-08 1990-05-16 Nec Corp Information transmission system
JPH02135941A (en) * 1988-11-17 1990-05-24 Nec Eng Ltd Monitoring device for system down of work station
JPH03158035A (en) * 1989-11-15 1991-07-08 Matsushita Electric Works Ltd Time division multiplex transmission system
JPH0752882B2 (en) * 1989-11-15 1995-06-05 松下電工株式会社 Time division multiplex transmission system
JPH03198549A (en) * 1989-12-27 1991-08-29 Mitsubishi Electric Corp Multi-point monitor system
JPH0716199B2 (en) * 1989-12-27 1995-02-22 三菱電機株式会社 Multipoint monitoring system
JPH03241942A (en) * 1990-02-20 1991-10-29 Mitsubishi Electric Corp Data communication system
JPH0761076B2 (en) * 1990-02-20 1995-06-28 三菱電機株式会社 Data communication method
JPH04100839U (en) * 1991-02-05 1992-09-01 富士重工業株式会社 composite structure
WO2019122589A1 (en) * 2017-12-21 2019-06-27 Psa Automobiles Sa Device for supervising slave member faults for a master member of a multiplexed network
FR3076161A1 (en) * 2017-12-21 2019-06-28 Psa Automobiles Sa (EN) SLAVE ORGAN FAULT SUPERVISION DEVICE (S) FOR A MASTER ORGAN OF A MULTIPLEX NETWORK.
CN111512663A (en) * 2017-12-21 2020-08-07 标致雪铁龙汽车股份有限公司 Slave failure monitoring device for a master of a multiplex network
CN111512663B (en) * 2017-12-21 2024-05-14 标致雪铁龙汽车股份有限公司 Slave component fault monitoring device for a master component of a multiplex network

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