WO1998043393A2 - Procede permettant d'ajouter une station abonne a un systeme de transmission reseau - Google Patents

Procede permettant d'ajouter une station abonne a un systeme de transmission reseau Download PDF

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Publication number
WO1998043393A2
WO1998043393A2 PCT/DE1998/000840 DE9800840W WO9843393A2 WO 1998043393 A2 WO1998043393 A2 WO 1998043393A2 DE 9800840 W DE9800840 W DE 9800840W WO 9843393 A2 WO9843393 A2 WO 9843393A2
Authority
WO
WIPO (PCT)
Prior art keywords
slave
network
master
slaves
router
Prior art date
Application number
PCT/DE1998/000840
Other languages
German (de)
English (en)
Other versions
WO1998043393A3 (fr
Inventor
Axel Hosemann
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP98925426A priority Critical patent/EP0968592A2/fr
Publication of WO1998043393A2 publication Critical patent/WO1998043393A2/fr
Publication of WO1998043393A3 publication Critical patent/WO1998043393A3/fr
Priority to US09/401,023 priority patent/US6160795A/en

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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]
    • H04L12/46—Interconnection of networks
    • H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462—LAN interconnection over a bridge based backbone
    • H04L12/4625—Single bridge functionality, e.g. connection of two networks over a single bridge
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • 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
    • H04L12/403—Bus networks with centralised control, e.g. polling
    • 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]
    • H04L12/46—Interconnection of networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission

Definitions

  • the invention relates to a method for network communication, in particular for communication within an electrical low-voltage network, in which a status is sent from a master to a plurality of slaves in a number of network paths (status poling). It also relates to such a communication-capable network.
  • PLC Power Line Carrier
  • a communication-capable network with such a master-slave architecture is known, for example, from EP 0 598 297 A2.
  • the master sends a logon request over the network to all newly installed devices (slaves) so that the master can communicate with these slaves after receiving the response from these newly installed slaves.
  • Such a communication-capable network enables, in particular, the reading out of electricity payers and the automatic recognition of a payer or device additionally connected to the network without additional installation effort.
  • a method for transmitting data packets in a network is known from CH 677 300 A5, in which subscriber stations that cannot be reached directly by the master are contacted via subscriber stations operating as relay stations. A special call is sent to add new participants to the network, which may be sent to the new participants via the relay stations. These then respond to the master call.
  • Another network is known from DE 36 19 906 AI, in which participants can be reached indirectly.
  • the invention is therefore based on the object of specifying a method for communication within a network having a master-slave architecture and such a communication-capable network which also enables communication of such a device with the master which cannot receive the master directly.
  • This method and this network are intended to allow newly installed devices to be added to the network in a simple manner, regardless of their distance from the master and without any impetus from the master.
  • each slave that is not directly, but only indirectly accessible by the master is identified via a neighboring slave and included in the network.
  • the new slave reports in the
  • Network after he has informed himself about his network environment, in particular about the neighboring slaves, by listening. This can be described as a general call that should be heard by as many participants as possible. Information about the “best neighbors” to which priorities are assigned can also be contained in the notification call.
  • the new slave can thus be identified in the network and, if necessary, simultaneously communicates the network environment it has recognized, so that it can be addressed by the rest of the network.
  • the master can then query the slave, which can only be reached indirectly, via the neighboring slave, which is prioritized as a router slave, and receive its response.
  • This procedure is particularly suitable for adding new devices and thus additional slaves to the network.
  • a number of neighboring slaves are used as router slaves by the newly installed slave during or following a status query of the master received from it
  • the new slave is then registered by the or each prioritized router slave with the master, an address assigned to the newly installed slave being recorded in a corresponding register or in a data table.
  • the router slaves and the network routes or network routes via which the additionally installed slave can be reached in accordance with the assigned reliability priority are also included in this data table.
  • the grouping of the addresses of the slaves connected to the network is updated in the data table with regard to the network routes and those router slaves via which the respective slave can be reached.
  • At least one router slave is assigned to each slave, with the address of the master also being included in this routing table as the router address can. In this case, the corresponding slave can be reached directly from the master.
  • the stated object is achieved according to the invention by a network management software in accordance with the features of claim 8.
  • the network management Software is also advantageously used to generate network routes, in particular replacement routes, between the master and each slave.
  • ISO International Standardization Organization
  • the ISO communication protocol which is divided into seven successive levels or protocol layers, is a quasi-standardized model for the development of interfaces for the communication process within a communication network.
  • the bottom, first layer defines the way in which signals or individual bits are transmitted, from which, for example, modulation or amplification data are built.
  • the second layer defines the procedures for ensuring error-free transmission on the individual network routes or network routes of the systems (slaves) to avoid collisions.
  • the third layer ensures the correct structure of the individual sections between master (transmitter) and slave (receiver).
  • the fourth layer Transport Layer defines the function and the way in which the systems (masters, slaves) within the network or network should behave during the data transport.
  • the lower four layers represent the transport protocol and today are largely defined in the systems according to the ISO communication protocol.
  • connection layer specifies the details of the communication between the systems to be used in a connection to be carried out, i.e. between the master and the slaves and between the slaves.
  • the sixth layer contains the agreements to be made regarding the meaning of the data exchanged.
  • seventh layer Application Layer
  • Agreement Layer agreements about the permissible applications between the communicating systems are fixed.
  • Layers are also referred to as an application protocol, in which the agreements are made about the possible and permissible operations that the master initiates in the system of the slave.
  • To implement the router function therefore, advantageously only a data conversion within the three lowest layers of the ISO communication protocol is required.
  • the network management software includes a (first) software module assigned to the master and a (second) software module assigned to each slave.
  • the master's software module is used to generate at least one router slave for the or each slave.
  • This software module preferably generates at least one additional network path or replacement route via which this slave can be reached as an alternative.
  • the software module of the slave is used to identify a neighboring slave. This software module generates a priority or quality list of the “best Neighbors ", via whose software modules this list is forwarded to the master.
  • the advantages achieved by the invention are, in particular, that by appropriately breaking through the known master-slave architecture in such a way that a slave that can only be indirectly reached by the master is included in the network via an adjacent slave (router) New devices (slaves) that cannot be received directly by the master can be automatically added to a communication-capable network in a simple manner without additional installation work.
  • the new slave actively reports itself in the network without a prompt with a message signal. This takes place only after the slave has informed itself about the active network environment.
  • the method is particularly advantageously suitable for communication within an electrical low-voltage network, in which a data concentrator (master) for collecting and storing meter data from a large number of electricity meters (slaves) sends cyclical status queries to these in a number of network routes.
  • the data concentrator only allows indirectly accessible devices to be added to the network via the "best neighbors" (routers).
  • FIG. 1 schematically shows a master-slave architecture within a meshed communication-capable network
  • FIG. 2 shows the software architecture of a network management system for generating a router functionality within a network according to FIG. 1, and FIG. 3.4 data tables describing the router functionality of a master or a slave.
  • 1 shows the system architecture of a PLC subsystem (Power Line Carrier Subsystem) of a communication-capable network NW with two masters M ⁇ , 2 in the exemplary embodiment and a number of slaves S ⁇ ... n connected to them via the meshed network NW at three different distance levels El, E2, E3 relative to the locations of the Master M ⁇ / 2 .
  • it is a master-slave architecture within an energy supply network. The are on different
  • Each master M ⁇ , 2 represents a data concentrator (distribution data unit) for the devices or slaves S ⁇ ... n assigned to it.
  • Network management software explained in more detail with reference to FIG. 2 establishes connections from the respective master M ⁇ / 2 the respective slaves S ⁇ ... n . Due to the meshed network topology, the master M ⁇ (2) must communicate on different channels in order to avoid mutual interference during data transmission.
  • the establishment of the connection of each slave S ⁇ ... n z its master Mi or M 2 can either directly or under A number of slaves S ⁇ ...
  • n can be produced as so-called "routers.”
  • the meshing allows the connection of a slave S n to different masters M ⁇ , 2 , with a slave S n during operation from a master M ⁇ , 2 to other master M 2 , ⁇ can change.
  • each slave S n has a software module PLC and each master Mi, 2 has a software module PLC.
  • the software module PLC of each slave S n is connected to a connection line L n led to the corresponding device for power transmission, including the entire network functionality.
  • the bottom three layers of the ISO communication protocol are implemented in this software module PLC of each slave S n to implement the router functionality.
  • the layers of the ISO communication protocol lying above are implemented in an application module MA (Meter Applications) of the corresponding slave S n .
  • the functionality of this application module MA is independent of the functionality of the software module PLC, so that each network management function runs through these software modules PLC.
  • Each master M1, 2 has a data concentrator DC and a first communication module KM1, which only works at the master level, and a second communication module KM2 for communication that is functionally independent of the software module PLC.
  • the PLC software module is also integrated in the master functionality.
  • FIG. 1 The architecture of a network management software implemented in the software module PLC of the or each slave S n and in the software module PLC of the or each master M 2 is shown in FIG.
  • FIG 2 is shown schematically.
  • the implementation of the network management software NMS and a tabular network database or data table DT within the layers of the ISO communication protocol is shown.
  • the network management software NMS uses the third layer or network level NL (network layer) to set the course for data transport either to the next higher layers up to the application level AL (application layer) or to the next lower level, the data transport or data connection level DL (Data Link Layer) representative layer of the ISO communication protocol.
  • the data table DT also accesses the network level NL, which in turn is accessed by the network management software NMS.
  • the network level NL is transparent to the layers above.
  • the network level NL requires network information data in order to be able to transmit queries or information to the slaves S ⁇ ... n addressed as router slaves.
  • the functions of the network level NL are therefore always the same for the master M ⁇ , 2 and for each slave S n , while the network data and thus the data tables DT and the network management software NMS of the master M i / 2 or of the slave S n are different.
  • the data processing between the network level NL and the physical level PL (physical layer) link level DL (Data Link Layer) is transparent for the network management software NMS.
  • this data connection level DL in which the functionality of a collision detection and / or collision avoidance can also be realized, point-to-point connections between the slaves S ⁇ ... n are established or “broadcasts” sent without any master-slave structure.
  • the software architecture shown in FIG. 2 applies both to the software module PLC of the master MI, 2 and to the software module PLC of the slave S n .
  • Only the functionalities of the network management software NMS and the content and form of the data table DT are different for the master Mi, 2 and for the slave S n , while the respective structure is identical.
  • the network management software NMS M of the master M X / 2 or the network management software NMS S of the slave S n by appropriate indexing.
  • the software module PLC of the master M i (2) the network level NL is used for data acquisition from the higher levels TL, AL or from the network management software NMS M and for the transmission of this data to the data transport level DL.
  • the data table DT M created by the software module PLC of the master MI 2 is shown in FIG.
  • the frame of the corresponding data connection level DL M contains an address (device address) of the respective slave S n (meter), which is converted into a network address (network layer address) on the basis of the upper list in FIG. 3 (logon list).
  • the frame of the data link level DL M contains a number of fields for, for example, a first and a second router slave. These fields are assigned a route to the respective router slave R1, R2 on the basis of the list below in FIG. 3 (routing list), the router slaves best in terms of the reliable accessibility of a neighboring slave S n being be prioritized using a quality code.
  • the listed addresses consecutive from 0001h to 7FEFh, are selected as examples, the address 7FFFh identifying an unused router slave R1, R2.
  • the master Mi, 2 groups the slaves S n connected to it and listed in the "logon list" on the basis of their router slaves Rl, R2 and creates this list as a network data table DT M , which is updated cyclically.
  • each slave S n is assigned two router slaves Rl and R2 in three network routes or network routes L n (route nos. 1,2 and 3).
  • each slave S n generates a network data table DT S shown in FIG. 4 using the software module PLC.
  • the addresses of those router slaves R1, R2, R3 are entered on the one hand, via which this slave S n can be reached.
  • the slave S n first collects in the upper list in FIG. 4 (best router list) the addresses (addr. Nos. 1, 2, 3) of the slaves S n received by the latter via possible communication paths (routes) that are not have already been addressed by two router slaves R1, R2. These addresses are stored within a predeterminable time frame T z of, for example, 15 minutes before the slave S n as part of a cyclical status query to the master Mi, 2 the three first addresses of the "best neighbors" via the router slaves Rl belonging to these addresses , R2 announces.
  • the time frames T z ie the waiting times, are subject to an aging process so that more recent results are taken into account more strongly.
  • an additionally installed device in particular also a new slave to be added, via its software module PLC during a status query of the associated master Mi, 2, in which the slave itself is not yet queried because of its "unknownness" in the network, addresses of as possible Router slaves Rl to R5 collect identified slaves S n and prioritize them in terms of their respective accessibility. So he first gets information about his network environment.
  • This slave S n then reports with a spontaneous signal in the network and immediately or, if necessary, on the basis of a later call, reports the addresses of the prioritized router slaves R 1 to R 3.
  • the new slave is then registered by the router slave (s) Rl to R3 to the corresponding master Mi, 2 .
  • Its software module PLC then in turn makes a corresponding entry in its network data table DT M. 2 then causes the master M ⁇ , the highest priority slave router Rl to the additionally installed slave S n via the corresponding route (route no. 1) included in the network NW.
  • the software module PLC of each slave S n thus serves to identify both an adjacent slave S n , for example a newly installed slave S n , and at least one adjacent slave S n as future router slave R1, R2.
  • the network management software NMS - implemented in the software modules PLC, PLC - thus enables each master Mi, 2 to assign three communication paths (routes) to each slave S n in the exemplary embodiment.
  • the table DT M which in addition to these routes or network routes L n also contains the router slaves R1, R2 assigned to each slave S n , is preferably updated dynamically.
  • the network management software NMS would enable any newly installed slave S n to receive its neighboring slaves S ⁇ ... n _ ⁇ and to report via the "best neighbors" - that is to say, itself - for inclusion in the NW network.
  • slaves can be easily added to the network NW regardless of their distance from the data concentrator DC (master) without additional installation effort.
  • slaves S n of the third distance level E3 two router slaves R1, R2 are listed in the data table DT, while for those of the second distance level E2, only one router slave R1 is listed.
  • the master MI 2 is itself registered as a router slave R1.
  • An essential aspect of the new idea is that after an orientation or listening phase in the network, new slaves report themselves to the router slaves without being asked to “piggyback”, in order to then be included indirectly in the data network. They are then indirectly - quasi second or third generation - involved in the data traffic with the master, whereby the master has no direct access to such slaves. A change can result from a change in the transmission quality or the network configuration. This is checked during routine status queries and updated if necessary.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Small-Scale Networks (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

L'invention concerne un procédé de transmission dans un réseau (NW), notamment de transmission dans un réseau électrique basse tension. Selon ce procédé, un maître (Mi1,2) envoie une demande d'état à une pluralité d'esclaves (Sn) dans un certain nombre de lignes (Ln) du réseau. Un esclave (Sn) qui ne peut pas être directement joint par le maître (M1,2), comme par exemple un esclave (Sn) installé en plus, est englobé dans le réseau (NW) via un esclave (Sn) voisin, lequel est adressé comme esclave d'acheminement (R1, R2) pour l'esclave (Sn) ne pouvant être joint qu'indirectement. De plus, le maître (M1,2) possède dans un logiciel de gestion du réseau (NMS) un module logiciel (PLC') permettant d'affecter à chaque esclave (Sn) au moins un esclave d'acheminement (R1, R2). En outre, chaque esclave (Sn) possède un module logiciel (PLC) correspondant destiné à identifier un esclave (Sn) voisin comme esclave d'acheminement potentiel (R1 à R5).
PCT/DE1998/000840 1997-03-21 1998-03-23 Procede permettant d'ajouter une station abonne a un systeme de transmission reseau WO1998043393A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98925426A EP0968592A2 (fr) 1997-03-21 1998-03-23 Procede permettant d'ajouter une station abonne a un systeme de transmission reseau
US09/401,023 US6160795A (en) 1997-03-21 1999-09-21 Network communication

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19711958A DE19711958A1 (de) 1997-03-21 1997-03-21 Netzwerkkommunikation
DE19711958.1 1997-03-21

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/401,023 Continuation US6160795A (en) 1997-03-21 1999-09-21 Network communication

Publications (2)

Publication Number Publication Date
WO1998043393A2 true WO1998043393A2 (fr) 1998-10-01
WO1998043393A3 WO1998043393A3 (fr) 1998-12-23

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DE (1) DE19711958A1 (fr)
WO (1) WO1998043393A2 (fr)

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DE19904358B4 (de) * 1999-02-04 2005-07-07 Abb Research Ltd. Verfahren zum Datenaustausch über ein dezentrales Netzwerk
CA2299559A1 (fr) * 2000-02-23 2001-08-23 Oneline Ag Systeme de communication par ligne de transport
US7246184B2 (en) 2002-04-12 2007-07-17 Siemens Aktiengesellschaft Method for configuring and/or operating an automation device
DE10216277A1 (de) * 2002-04-12 2003-10-23 Siemens Ag Verfahren zum Projektieren und/oder Betreiben einer Automatisierungseinrichtung
DE102006004233A1 (de) * 2006-01-30 2007-08-09 Siemens Ag Österreich Kommunikationsstruktur für Solarwechselrichter
WO2008148415A1 (fr) * 2007-06-05 2008-12-11 Siemens Aktiengesellschaft Procédé et dispositif pour modifier de manière sélective des données de fonctionnement d'un composant de réseau

Citations (4)

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Publication number Priority date Publication date Assignee Title
EP0395495A1 (fr) * 1989-04-27 1990-10-31 SCHLUMBERGER INDUSTRIES, INC. (a Delaware corporation) Routage adaptatif de réseau pour communication par le réseau électrique
FR2674996A1 (fr) * 1991-04-03 1992-10-09 Sgs Thomson Microelectronics Systeme d'echanges de donnees entre poste central et stations a distance.
WO1995001030A1 (fr) * 1993-06-25 1995-01-05 Remote Metering Systems Ltd. Systemes de signalisation d'un reseau de distribution electrique
EP0852419A2 (fr) * 1996-12-04 1998-07-08 Powercom Control Systems Ltd. Système pour gérer une alimentation en énergie électrique

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US4692761A (en) * 1985-06-21 1987-09-08 Robinton Products, Inc. Adaptive communication network and method
CH677300A5 (fr) * 1989-03-21 1991-04-30 Asea Brown Boveri
GB2272551B (en) * 1992-11-14 1996-01-17 Siemens Measurements Ltd A polled communications network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395495A1 (fr) * 1989-04-27 1990-10-31 SCHLUMBERGER INDUSTRIES, INC. (a Delaware corporation) Routage adaptatif de réseau pour communication par le réseau électrique
FR2674996A1 (fr) * 1991-04-03 1992-10-09 Sgs Thomson Microelectronics Systeme d'echanges de donnees entre poste central et stations a distance.
WO1995001030A1 (fr) * 1993-06-25 1995-01-05 Remote Metering Systems Ltd. Systemes de signalisation d'un reseau de distribution electrique
EP0852419A2 (fr) * 1996-12-04 1998-07-08 Powercom Control Systems Ltd. Système pour gérer une alimentation en énergie électrique

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EP0968592A2 (fr) 2000-01-05
WO1998043393A3 (fr) 1998-12-23
DE19711958A1 (de) 1998-09-10

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