EP1749375A1 - Systeme a topologie a double anneau pour la transmission de donnees, et stations de ce systeme - Google Patents

Systeme a topologie a double anneau pour la transmission de donnees, et stations de ce systeme

Info

Publication number
EP1749375A1
EP1749375A1 EP05739920A EP05739920A EP1749375A1 EP 1749375 A1 EP1749375 A1 EP 1749375A1 EP 05739920 A EP05739920 A EP 05739920A EP 05739920 A EP05739920 A EP 05739920A EP 1749375 A1 EP1749375 A1 EP 1749375A1
Authority
EP
European Patent Office
Prior art keywords
data
ring
clock
status information
transmission
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.)
Withdrawn
Application number
EP05739920A
Other languages
German (de)
English (en)
Inventor
Eberhard Boehl
Werner Harter
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1749375A1 publication Critical patent/EP1749375A1/fr
Withdrawn legal-status Critical Current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]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration

Definitions

  • the invention is based on a system with at least three participants for the transmission of data and at least two transmission paths between the participants and a corresponding participant in accordance with the preambles of the independent claims.
  • the invention is based on a system with at least three participants for the transmission of data with two transmission paths between the participants, the transmission paths forming a first ring and a second ring with opposite directions of transmission, a first connection being advantageously provided in each participant, through which the first ring can be connected to the second ring and a second connection is provided, through which the second ring can be connected to the first, in such a way that, in the event of a cable connection failure, the interruption is detected and the loop between the incoming one and the return ring are closed at the point of interruption.
  • This can be provided for a line break as well as for the failure of individual participants. This also ensures that the data is transferred from the nodes to all other nodes before the interruption.
  • a control unit in which status information is generated is expediently provided in the system or in each subscriber. This status information is exchanged between the rings via the respective connection, whereby the
  • Evaluation of the fire information contained therein is possible regardless of the ring in which the status information was generated.
  • An evaluation unit is expediently provided for the evaluation, in particular in the control unit for evaluating the status information, which is designed such that if an error occurs when evaluating the status information, the data is transmitted one ring is prevented and the data is instead transmitted via the connection to the other ring.
  • the data are transmitted in predeterminable frames and a coupling unit is advantageously provided, likewise in particular the control unit, which couples the status information at a predefinable position in the space.
  • Both rings are advantageously operated with the same clock, so that at least one clock unit is provided in a subscriber, by means of which the first ring and the second ring are operated with the same clock for transmitting the data. This has the advantage that in data redirection via the first or second
  • At least two clock units which are assigned to or contained in at least two different subscribers, with advantageously only one clock unit specifying the clock for operating both rings and for simplifying the system according to the invention Failure of a first clock unit, the at least second clock unit specifies the clock.
  • the subscribers which contain or are assigned to the at least two clock units, are arranged as neighbors in the system and in close proximity to one another, so that the clock sovereignty can be transferred easily and maintain the transmission paths in the case of proximity and neighborhood can be.
  • a clock unit is included in the system, since due to the structure according to the invention with two connections and the processing of the data of both rings in each participant and the use of a common clock, a simple clock recovery from the data transmission in each participant can take place without the need for each participant to have their own time base, that is to say timing.
  • Figure 1 shows an inventive system with the corresponding voting structure.
  • Figure 2 shows the system when a line break occurs.
  • Figure 3 shows the system when a participant fails.
  • each subscriber is shown in FIG. 4 and the structure of a subscriber with its own time base, that is to say a clock unit, is shown in FIG. 5.
  • FIG. 6 shows an example of a bicycle system according to the invention.
  • FIG. 7 shows a master-slave combination in a system according to the invention.
  • Figure 8 shows the failure of the master in the master-slave combination.
  • FIG. 9 shows master failure or failure of the entire master-slave combination and additional backup master
  • FIG. 10 shows the failure of the master or the master-slave combination " with a simultaneous second error, such as selection of a connection or one Participant with additional backup masters and creation of subsystems.
  • FIG. 1 shows a voting structure with a master-slave combination 100 with a master 103 and a slave 104.
  • another six subscribers are shown as slaves, that is to say in particular without a separate clock unit from 105 to 110.
  • the subscriber 103 to 110 are connected in FIG two opposite rings Rl and R2, so that two redundant ring-shaped data paths, Rl and R2, are used in the opposite direction for data transmission.
  • the master-slave combination 100 can additionally increase the reliability, by providing two redundant clock units 101 and 102 in addition to a master and a slave that can assume the master function.
  • a master 200 with a clock unit 201 is shown instead of the master-slave combination 100.
  • the use of the master-slave combination 100 or a sole master 200 is optional and interchangeable. If an error now occurs in the system, for example an interruption in the line as shown here between subscribers 107 and 108, the data transfer in the system can be maintained by redirecting information in the corresponding subscribers. I.e. Even if all connections between two nodes or participants are interrupted, there is still a secure data exchange between all nodes. However, this is only possible in that, according to the invention, the data of both rings R1 and R2 are always evaluated and processed in each subscriber and contrary to that
  • FIG. 4 now shows the structure of a subscriber in which cross connections between the rings are realized. These cross connections are shown in FIG. 4 as connection 1, 400V1 and as connection 2, 400V2.
  • the subscriber or node has a first input 400E1 and a first output 400A1 as well as a second input 400E2 and a second output 400A2.
  • the two transmission paths corresponding to the rings R1 and R2 can be implemented via these inputs and outputs.
  • a control unit 401 or 402 corresponding to each transmission path is now provided, in which status information is generated.
  • This status information contains, for example, network information relating to the failure of a node or subscriber or also fire information or the defect status of a cut connection between two subscribers. Accordingly, every participant is everyone.
  • Control unit 401 or 402 is able to generate such status information itself. This status information can then be exchanged between the rings via the corresponding connection 400V1 or 400V2. This is done by coupling the status information using a coupling unit 406, in particular into the data frame, which is described in more detail in FIG. 6. 407 serves to determine the exact position of the status information in the frame, which can be done, for example, via a counting device that counts bits or bytes.
  • an evaluation unit 405 or for the other direction 408 for evaluating the status information received via the inputs in the frame.
  • These units 405, 406 and 407 can be provided both in the control unit and outside. This also applies to the other direction, for the elements 408, 409 and 410.
  • the evaluation unit 405, now or in the opposite direction 408, is used to evaluate the status information and is designed such that when
  • Control connection 401 ST2 to switchover element 404 prevents transmission via 400R1 if the error has occurred in the ring R1. This is done in the other direction via control unit 402 and evaluation unit 408.
  • connection 400V2 is now at least partially activated via control input 402ST1, that is to say transmission of status information or other data right up to the whole
  • a connection between the control units can additionally be provided, shown here in dashed lines, in order to implement such measures between the control units depending on the corresponding ones
  • a frame for data transmission is provided by way of example in FIG. 6, so that all data are transmitted in synchronous frames ... frames, with a certain data area being assigned to each node involved in the voting.
  • the proposed frame starts here with a Prearnbel P, which marks the beginning of the frame.
  • the status information which can comprise from one bit to one byte or more bytes, is then represented by S.
  • DT1, DT2 to DTN corresponds to the data areas of the respective participants T1, T2 to TN, that is to say in the figures previously 103 to 110 and 200, respectively, who are involved in the voting.
  • With CI further control information is provided and with LI I ⁇ p information and EOF shows the end of frame, i.e. the end of the frame on. According to FIGS.
  • slatus information can now be obtained by evaluating a ring corresponding to the respective evaluation unit 406, 408, 506 or 508 and transferring the mformation to the opposite ring in a special status area S with a corresponding evaluation of this status information in the respective near-node or subscriber Errors are recognized and correction data are thus coupled in or completely switched over to the respective connection in the event of a defect status of a subscriber or a line between the subscribers.
  • the information, in particular the status information is received and evaluated in the control unit from one direction via the input E2, that is to say 400E2 or 500E2, and on the other hand via the input in the opposite direction
  • El, ie 400E1 or 500E1 also enters control unit 501 or 401 and is evaluated there, as described in FIG. 4.
  • felals in particular interruptions in lines between two nodes or subscribers, can be automatically detected, in exactly the same way as the complete tear-off of both rings at this point or the complete failure of a subscriber.
  • One participant acts as
  • the clock unit can be implemented redundantly and in the event of a master subscriber error, any node that has access to such a clock-generating element, that is to say to such a clock unit, can take over the function.
  • any node that has access to such a clock-generating element that is to say to such a clock unit, can take over the function.
  • either a complete switchover of the data stream, that is to say a diversion from one ring to the other ring, or a bypass can be implemented in less severe cases. I.e. In addition to passing, a correction can also be made by coupling information from the other control unit of the opposite circle, as already described.
  • the information or the data of the system is transmitted in a predetermined length. 32, 64 or 128 bytes or any other frame length can be used. Each frame starts with one
  • Preamble P and the data are coded in such a way that clock recovery can take place, for example, using a PLL.
  • the data transmission can take place on an electrical physical layer, such as LVOS, low voltage differential signaling or UTP unshielded twisted pairs.
  • LVOS low voltage differential signaling
  • UTP unshielded twisted pairs For all active nodes or participants, i.e. those who participate in the voting, Rahr ⁇ e- ⁇ positionen DT1, DT2 to DTN provided according to the respective participant. The length depends on the predefinable number of participants or nodes participating in the voting. Because of the synchronous work of all nodes or participants, i.e. using the same clock frequency of the same clock, it is possible to obtain all information or all bypass data that has not been generated by the subscriber concerned. An optimal implementation of such a bypass requires ...
  • each participant In order to carry out a voting, each participant must be able to carry out simple arithmetic, logical and comparison operations.
  • a simple or small processor in each voting unit can be used to carry out these tasks.
  • This small processor can then represent or be contained in the control unit in order to control the data flow, to evaluate the status information and to check the correct operation of the participants, as described in FIGS. 4 and 5.
  • the different participants in the system carry out the evaluation procedure, i.e. the voting, independently of one another.
  • Each participant receives input variables, for example from sensors, and uses them for a calculation or
  • the input variables of the participants can differ in a tolerable order of magnitude.
  • all input variables could be exchanged, evaluated and replaced depending on the respective one at the beginning of the voting procedure Calculation.
  • the calculation is then carried out as a second step and the results are exchanged.
  • the voting can be carried out in each participant and the evaluation results can also be exchanged.
  • the actuators can then be influenced by evaluating these voting results in order to achieve the desired system reaction. Participants who deliver unacceptable results at the end of the voting procedure can be excluded from the evaluation. This allows the participants, especially those who remain after the exclusion, to act in a customized manner without any significant influence on the global system behavior. Information to separate the different phases of this evaluation process can also be found in the
  • Statasinformation be housed, just the type of data that is transmitted as well as the validity of this data. Also the system status and the number of active participants as well as the status of these participants with regard to voting. This means that each participant can evaluate the status of each other participant, and if there are differences, errors can be easily identified. This is possible because every participant is all
  • the incoming data information is to be checked in each participant, for example for code errors, preamble, number of bytes, the frame, the EOF byte, etc.
  • this can be excluded as described above.
  • the loop information LI is introduced after the control information CI in order to transmit information from one ring, that is to say the one transmission direction on the other ring or the other transmission direction, in order to make the subscriber accessible from both
  • FIG. 7 again shows a system structure with a master-slave arrangement 700, a master 103 and a non-masler participant 104.
  • redundant clock units 702 and 703 are shown, which can be assigned either to master 103 or to non-masler 104 and thus to Clock for the system, so the rings R1 and R2 with the participants 105 to 110 and 103 and 104 can specify.
  • Participants can be given at least a pay-safe rating (???) when comparing the functionalities for equality.
  • a pay-safe rating ???
  • scaling can thus take place within the framework of fail-safe or fail-safe by being able to predefine potential sub-networks.
  • the invention can thus be advantageously used for all safety-critical applications, in particular in X-by-wire systems and especially wherever an evaluation, ie a voting, is carried out.

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

Abstract

Système comportant au moins trois stations pour la transmission de données au moyen de deux voies de transmission entre les stations, les voies de transmission formant un premier anneau et un second anneau ayant chacun une direction opposée de transmission, caractérisé en ce qu'il est prévu dans chaque station, une première liaison au moyen de laquelle le premier anneau peut être connecté au second, et une seconde liaison au moyen de laquelle le second anneau peut être connecté au premier, et en ce que les données des deux anneaux sont traitées dans chaque station.
EP05739920A 2004-04-13 2005-04-13 Systeme a topologie a double anneau pour la transmission de donnees, et stations de ce systeme Withdrawn EP1749375A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004018319A DE102004018319A1 (de) 2004-04-13 2004-04-13 System zur Übertragung von Daten und Teilnehmer des Systems
PCT/EP2005/051639 WO2005101750A1 (fr) 2004-04-13 2005-04-13 Systeme a topologie a double anneau pour la transmission de donnees, et stations de ce systeme

Publications (1)

Publication Number Publication Date
EP1749375A1 true EP1749375A1 (fr) 2007-02-07

Family

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Family Applications (1)

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EP05739920A Withdrawn EP1749375A1 (fr) 2004-04-13 2005-04-13 Systeme a topologie a double anneau pour la transmission de donnees, et stations de ce systeme

Country Status (7)

Country Link
US (1) US20070274208A1 (fr)
EP (1) EP1749375A1 (fr)
JP (1) JP2007533227A (fr)
CN (1) CN1943178A (fr)
DE (1) DE102004018319A1 (fr)
RU (1) RU2006130316A (fr)
WO (1) WO2005101750A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102005016596A1 (de) * 2005-04-11 2006-10-19 Beckhoff Automation Gmbh Teilnehmer, Master-Einheit, Kommunikationssystem und Verfahren zu deren Betreiben
DE102006018884A1 (de) * 2006-04-24 2007-10-25 Beckhoff Automation Gmbh Schnittstelleneinheit und Kommunikationssystem mit einer Master-Slave-Struktur
JP4991254B2 (ja) * 2006-11-17 2012-08-01 株式会社東芝 二重リング・ネットワークの通信制御方法及び二重リング・ネットワークの伝送局
KR101483045B1 (ko) * 2007-10-02 2015-01-15 에스엠에스씨 유럽 게엠베하 링 버스 시스템에서 신호 장애 검출을 위한 시스템 및 방법
DE102019131823B4 (de) * 2019-11-25 2021-12-09 Beckhoff Automation Gmbh Automatisierungsnetzwerk und Verfahren zur Datenübertragung in einem Automatisierungsnetzwerk

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DE3340992A1 (de) * 1983-11-12 1985-05-23 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Digitales kommunikationssystem
US6611537B1 (en) * 1997-05-30 2003-08-26 Centillium Communications, Inc. Synchronous network for digital media streams
DE19755054A1 (de) * 1997-12-11 1999-06-17 Bosch Gmbh Robert Verfahren zur Übertragung digitaler Daten
JP3512329B2 (ja) * 1998-03-05 2004-03-29 富士通株式会社 複数ネットワークの一括監視制御システム
US20020024929A1 (en) * 1998-09-22 2002-02-28 Dieter Brueckner Network and coupling device for connecting two segments in a network
DE19843449A1 (de) * 1998-09-22 2000-06-08 Siemens Ag Netzwerk sowie Koppelgerät zur Verbindung zweier Segmente in einem derartigen Netzwerk
US6807190B1 (en) * 1999-05-25 2004-10-19 Lucent Technologies Inc. Survivable distribution of broadcast signals in loopback rings
JP3721039B2 (ja) * 2000-02-21 2005-11-30 株式会社東芝 伝送システムとそのトラフィック制御方式および伝送装置
EP1276262A1 (fr) * 2001-07-10 2003-01-15 Lucent Technologies Inc. Réseau de communication en anneau avec séparateur de données dans les noeuds
US6980568B1 (en) * 2001-07-17 2005-12-27 Ciena Corporation Method and apparatus for system clock synchronization

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Also Published As

Publication number Publication date
DE102004018319A1 (de) 2005-11-03
WO2005101750A1 (fr) 2005-10-27
US20070274208A1 (en) 2007-11-29
RU2006130316A (ru) 2008-05-20
CN1943178A (zh) 2007-04-04
JP2007533227A (ja) 2007-11-15

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