[go: up one dir, main page]

WO1996008098A1 - Procede de transmission de donnees entre des stations ou des unites de traitement de donnees - Google Patents

Procede de transmission de donnees entre des stations ou des unites de traitement de donnees Download PDF

Info

Publication number
WO1996008098A1
WO1996008098A1 PCT/AT1995/000167 AT9500167W WO9608098A1 WO 1996008098 A1 WO1996008098 A1 WO 1996008098A1 AT 9500167 W AT9500167 W AT 9500167W WO 9608098 A1 WO9608098 A1 WO 9608098A1
Authority
WO
WIPO (PCT)
Prior art keywords
station
fault
network
stations
broadcast
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.)
Ceased
Application number
PCT/AT1995/000167
Other languages
German (de)
English (en)
Inventor
Norbert Bock
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.)
Elin Energieanwendung GmbH
Original Assignee
Elin Energieanwendung GmbH
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 Elin Energieanwendung GmbH filed Critical Elin Energieanwendung GmbH
Publication of WO1996008098A1 publication Critical patent/WO1996008098A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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]
    • H04L12/40—Bus networks
    • H04L12/40169—Flexible bus arrangements
    • H04L12/40176—Flexible bus arrangements involving redundancy
    • H04L12/40189—Flexible bus arrangements involving redundancy by using a plurality of bus systems
    • 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]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/417—Bus networks with decentralised control with deterministic access, e.g. token passing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • 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]
    • H04L12/40—Bus networks
    • H04L2012/4026—Bus for use in automation systems

Definitions

  • the invention relates to a method for data transmission between information processing stations or devices, e.g. Programmable logic controllers, host computers or operating devices for automation technology, which are connected to each other via a double (redundant) network with serial or parallel buses, and where the data is transferred using the token-passing method.
  • information processing stations or devices e.g. Programmable logic controllers, host computers or operating devices for automation technology
  • Bus systems have the advantage that all stations are connected in parallel to the data carrier (bus line), which means that when individual stations are switched off there is no breakdown of the network. In the case of bus systems, the information is also transmitted faster than in the case of ring systems.
  • the "token” is a defined bit sequence that is passed on from one station, each of which has a unique identification number in the network, to the next. Each station forwards the “token” to the station with the next higher identification number in the network. Since the number of identification numbers to be assigned is limited, the station with the lowest number receives the "token” from the station with the highest number, as a result of which a logical ring is formed in the network. The “token” remains with the station during transmission. This ensures that there is no data collision on the bus.
  • a property of the token passing method is that stations can be switched on or off at any time. However, a reconfiguration is necessary to maintain the logical token ring.
  • a new station When a new station is switched on or closed If an existing network is connected, it does not get a token because at the beginning no identification number is entered as a new number at any station. After the token timeout has expired, the new station sends out a continuous signal and thus interrupts the current communication. All stations now begin to count down from the highest identification number until they have reached their own station number. If a station has reached its own number, it now tries to pass the token on to the station with the next higher one. If this station does not exist, an attempt is made to pass the token on to the station with the number increased by two. This is repeated until an existing station is reached.
  • the attempt is made to send the token to the station with the lowest possible number. If the token transfer to a second station was successful, their identification number is saved as a new number. The second station now tries to pass on the token to the station with the next higher number, this is increased by one until the next station is reached. When all stations have entered the number of their successor stations, the reconfiguration is complete.
  • the transmission authorization (token) is passed on from one station to the next both on the active and on the passive bus.
  • the object of the invention is now to create a method for a double-executed or redundant network, with which one of the two buses gradually becomes active for all stations in the event of a fault.
  • the object is achieved by the invention, which is characterized in that all stations work according to a constant synchronized time cycle which is divided into three phases, which run in the order of synchronization phase, broadcast phase and message phase, with the beginning and end of each phase in all stations Network is known, and that the type of data telegram that is released by each individual station for transmission is determined by the phase that is currently relevant, and that each station cyclically and independently of each other independently of each other for functionality or errors (Fault) is monitored, and that each error in the entire network is assigned a unique error weight as an even number, and that each station has either the conditions observed itself or those reported by another station with the highest error weight on the one for the sending station currently active bus the other stations in the network in the broadcast phase, in which each station sends a data telegram to all stations one after the other, and that each station
  • the functional, interference-free network is assigned the error weight "0".
  • a further development of the invention is that those stations in the network that are not capable of redundancy are assigned the highest error weight. Since this is the largest possible error, the next broadcast phase immediately switches from the redundant network to a single network.
  • the station which is the first to receive transmission authorization in the broadcast phase becomes the broadcast master in this time cycle and only from this at If the next send authorization is received, the broadcast end telegram is sent on both buses, and therefore only a single broadcast end telegram occurs in the functional, interference-free network on the active and passive bus during a cycle, and that if more than one broadcast end occurs An error is derived on the telegram on one of the two or on both buses. This measure can be used to determine which of the two buses is defective and the bus that is in Ordnimg also immediately becomes active.
  • the fault weight is reduced in constant steps until the weight is either "0" or, in the event of a multiple fault, a pending fault with a lower weight until then determines which bus the active and which becomes the passive. Since the error weight in the individual stations does not immediately take on the lowest value after an error has been corrected, subsequent errors with a lower weight are partially ignored, depending on the time of occurrence.
  • FIG. 1 shows the structure of a redundant network and FIG. 2 shows the time cycle in the fault-free case on the passive bus.
  • the network 1 shows four stations 1, 2, 3, 4 connected to a redundant network.
  • This network consists of two parallel or serial buses 5, 6, one of which is always the active and the other the passive for each station 1, 2, 3, 4.
  • Each station 1, 2, 3, 4 has two network controllers 7, 8, one of which is connected to bus 5 and the second to bus 6.
  • the network controllers 7, 8 can be implemented in hardware or software.
  • each station 1, 2, 3, 4 sends a data telegram to all stations 1, 2, 3, 4.
  • all stations 1, 2, 3, 4 connected to the redundant network receive the transmission authorization (token) and send a released data telegram on their currently active bus 5 or 6.
  • the duration of the broadcast phase depends on the number of stations 1, 2, 3, 4 connected to the redundant network.
  • the broadcast phase is followed by message phase 11, in which each station 1, 2, 3, 4 sends a data telegram on the bus currently active for it 5 or 6 to a certain other station 1, 2, 3, 4, as long as it receives the transmission authorization.
  • This phase 11 is followed by the synchronization phase 13, 14 with the first 13 and the second synchronization telegram 14, which are likewise sent again on both buses 5, 6.
  • the first synchronization telegram 13 is sent by the station that is the first to get the token in this phase 13, 14. All stations 1, 2, 3, 4 on the network are time-synchronized with this telegram 13.
  • the second synchronization telegram 14 is sent by the station which subsequently receives the token and is ignored in all stations 1, 2, 3, 4.
  • the downward direction of the time cycle 9 is indicated by an arrow in this figure.
  • the duration of a time cycle is in the range of a few 100 ms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Small-Scale Networks (AREA)

Abstract

Dans un procédé de transmission de données fondé sur la méthode d'accès à jeton, entre des stations (1, 2, 3, 4) de traitement de données utilisées en technique d'automatisation, qui sont raccordées à un réseau (5, 6) redondant, toutes les stations fonctionnent selon un cycle temporel (9) synchronisé constant. Ce cycle temporel comprend trois phases successives: phase de synchronisation (13, 14), phase de diffusion (8) et phase de message (9). Chacun des deux bus (5, 6) est surveillé de manière cyclique par chacune des stations (1, 2, 3, 4), pour lui-même et indépendamment de l'autre, quant à sa fiabilité de fonctionnement ou à d'éventuels défauts (parasites). Un poids de défaut défini figurant sous forme de valeur à nombre pair est attribué à chaque défaut du réseau global. Durant la phase de diffusion, chaque station (1, 2, 3, 4) informe les autres stations (1, 2, 3, 4) du réseau des états observés par elle-même ou signalés par une autre station (1, 2, 3, 4) avec le poids de défaut le plus important en ce qui concerne le bus (5, 6) qui est précisément actif pour la station émettrice. Chaque station (1, 2, 3, 4) décide immédiatement sur la base de l'erreur qu'elle a pu elle-même observer ou qui a été transmise par une autre station (1, 2, 3, 4), avec le poids de défaut le plus important, quel est le bus (5, 6) qui doit être passif et quel est celui qui doit être actif. En présence d'un défaut, une commutation automatique s'effectue sur le bus (5, 6) en ordre, qui devient par conséquent actif. Après élimination du défaut, par ex. une coupure de ligne sur un des deux bus (5, 6), le système repasse automatiquement en fonctionnement en mode redondant.
PCT/AT1995/000167 1994-09-02 1995-08-17 Procede de transmission de donnees entre des stations ou des unites de traitement de donnees Ceased WO1996008098A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1684/94 1994-09-02
AT168494 1994-09-02

Publications (1)

Publication Number Publication Date
WO1996008098A1 true WO1996008098A1 (fr) 1996-03-14

Family

ID=3518761

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1995/000167 Ceased WO1996008098A1 (fr) 1994-09-02 1995-08-17 Procede de transmission de donnees entre des stations ou des unites de traitement de donnees

Country Status (1)

Country Link
WO (1) WO1996008098A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999014989A1 (fr) * 1997-09-18 1999-03-25 Siemens Aktiengesellschaft Dispositif de commande destine aux installations d'eclairage d'aeroports
EP0878981A3 (fr) * 1997-05-16 2000-08-23 Siemens Aktiengesellschaft Stabilisateur de courant
WO2001063850A1 (fr) * 2000-02-25 2001-08-30 Honeywell International Inc. Tolerance aux pannes de reseau multiples grace a une gestion redondante du reseau
WO2001084313A3 (fr) * 2000-05-02 2002-04-25 Sun Microsystems Inc Procede et systeme d'obtention d'une grande disponibilite dans un systeme informatique en reseau

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003825A1 (fr) * 1984-02-14 1985-08-29 Rosemount Inc. Systeme de commutation de canaux de communication alternants
EP0416942A2 (fr) * 1989-09-08 1991-03-13 Honeywell Inc. Méthode pour détecter un défaut sur un câble et pour connecter un câble redondant dans un réseau local universel
EP0580938A2 (fr) * 1992-06-26 1994-02-02 Yokogawa Electric Corporation Dispositif de commande pour la communication duplex

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985003825A1 (fr) * 1984-02-14 1985-08-29 Rosemount Inc. Systeme de commutation de canaux de communication alternants
EP0416942A2 (fr) * 1989-09-08 1991-03-13 Honeywell Inc. Méthode pour détecter un défaut sur un câble et pour connecter un câble redondant dans un réseau local universel
EP0580938A2 (fr) * 1992-06-26 1994-02-02 Yokogawa Electric Corporation Dispositif de commande pour la communication duplex

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0878981A3 (fr) * 1997-05-16 2000-08-23 Siemens Aktiengesellschaft Stabilisateur de courant
WO1999014989A1 (fr) * 1997-09-18 1999-03-25 Siemens Aktiengesellschaft Dispositif de commande destine aux installations d'eclairage d'aeroports
WO2001063850A1 (fr) * 2000-02-25 2001-08-30 Honeywell International Inc. Tolerance aux pannes de reseau multiples grace a une gestion redondante du reseau
CN100391190C (zh) * 2000-02-25 2008-05-28 霍尼韦尔国际公司 经由冗余网络控制的多重网络故障容错管理的方法和装置
WO2001084313A3 (fr) * 2000-05-02 2002-04-25 Sun Microsystems Inc Procede et systeme d'obtention d'une grande disponibilite dans un systeme informatique en reseau
US6854069B2 (en) 2000-05-02 2005-02-08 Sun Microsystems Inc. Method and system for achieving high availability in a networked computer system

Similar Documents

Publication Publication Date Title
DE3750967T2 (de) Steuerung von verteilten Taktimpulsen in einer verteilten Digital-Vermittlungsanlage.
EP0403763B1 (fr) Méthode et système d'interconnexion de calculateurs ou de réseaux de calculateurs
EP0964549B1 (fr) Circuit de surveillance d'un réseau de transmission
EP1869836B1 (fr) Unite maitre, systeme de communication et procede pour les faire fonctionner
WO2007121984A1 (fr) Unité d'interface et système de communication à structure maître-esclave
EP0092719B1 (fr) Disposition pour le couplage d'unités de traitement numérique
DE3140058A1 (de) Vielfachdatensystem
EP1648117B1 (fr) Procédé de synchronisation dans un système de communication redondant
EP0993714A2 (fr) Procede et systeme pour commander l'utilisation de la capacite de transmission de satellites dans des reseaux terrestres
EP0509114B1 (fr) Méthode pour la transmission de données à plusieurs stations
WO1996008098A1 (fr) Procede de transmission de donnees entre des stations ou des unites de traitement de donnees
DE4242438C2 (de) Vorrichtung zur Ausnutzung der Redundanz bei Datenringen in Doppelringtopologie
EP0720337A2 (fr) Méthode de communication de messages consistente et à haute fiabilité
DE3420365C2 (fr)
DE19921179A1 (de) Logikeinheit nach byzantinen Algorithmus, Rechnereinheit mit solcher Logikeinheit, Verbund aus Logik- oder Rechnereinheiten und Verfahren zum Betreiben eines solchen Verbunds
AT983U1 (de) Programmlogik zur datenübertragung zwischen informationsverarbeitenden stationen bzw. geräten
EP1399818A2 (fr) Procede et dispositif de communication dans un systeme informatique reparti tolerant aux erreurs
DE19951526C2 (de) Datenübertragungsnetzwerk
WO1996008097A1 (fr) Procede de transmission de donnees entre des stations ou des unites de traitement de donnees
EP1266461B1 (fr) Procede de passage a un reseau equivalent d'un champ de sous-ensembles dans des systemes numeriques de transmission de donnees et reseau equivalent pour la mise en oeuvre dudit procede
DE19513318C1 (de) Verfahren zum Betrieb eines asynchronen und redundanten Serienbusses
EP1550267A2 (fr) Procede de transformation d'un procede pour le fonctionnement d'un reseau ainsi que des abonnes pour appliquer le procede
EP0392246B1 (fr) Système de surveillance et de commande pour systèmes de transmission d'informations numériques avec maître et maître de substitution
DE2365871C3 (de) Datenübertragungsanlage
AT982U1 (de) Programmlogik zur datenübertragung zwischen informationsverarbeitenden stationen bzw. geräten

Legal Events

Date Code Title Description
AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase