EP1247382A2 - Systeme et procede de transmission de donnees par internet avec communication tcp/ip comme semaphore - Google Patents

Systeme et procede de transmission de donnees par internet avec communication tcp/ip comme semaphore

Info

Publication number
EP1247382A2
EP1247382A2 EP00991780A EP00991780A EP1247382A2 EP 1247382 A2 EP1247382 A2 EP 1247382A2 EP 00991780 A EP00991780 A EP 00991780A EP 00991780 A EP00991780 A EP 00991780A EP 1247382 A2 EP1247382 A2 EP 1247382A2
Authority
EP
European Patent Office
Prior art keywords
server
connection
client
internet
successful
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
EP00991780A
Other languages
German (de)
English (en)
Inventor
Thomas Talanis
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.)
Siemens AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP1247382A2 publication Critical patent/EP1247382A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • 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
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/167—Adaptation for transition between two IP versions, e.g. between IPv4 and IPv6
    • 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
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/168—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] specially adapted for link layer protocols, e.g. asynchronous transfer mode [ATM], synchronous optical network [SONET] or point-to-point protocol [PPP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols

Definitions

  • the invention relates to a system for transmitting data over the Internet between at least one client and at least one server.
  • the invention further relates to a method for transmitting data over the Internet between at least one client and at least one server, a server for establishing a data connection over the Internet to at least one client and a computer program product for a server for establishing a data connection over the Internet with at least one client.
  • the object of the invention is to ensure a semaphore which is valid throughout the network and which can also be used safely in critical operations between client and server.
  • This object is achieved by a system for transmitting data over the Internet between at least one client and at least one server, the server special resources for establishing exactly one passive connection between the server and exactly one client for executing critical
  • Has operations between the server and client and wherein a successful connection between the client with which the connection was established and the server is regarded as the receipt of the Internet semaphore.
  • This object is achieved by a method for transmitting data over the Internet between at least one client and at least one server, in which the server uses special resource means for establishing exactly a passive connection between the server and exactly one client for performing critical operations between the server and the client are provided and in which a successful connection between J ) t IS - 1 1 ⁇ o u ⁇ o L ⁇ o L ⁇
  • An automatic "activation" of the server for a new access by a client can be ensured in that the server has control means which, after a successful connection establishment and a failure of the client with which the connection establishment was successful, and / or in the event of a connection failure, the connection is considered to have been cleared down and the special resources are freed up again.
  • a time limit for the duration of a connection between client and server can be achieved in that the server has time monitoring means, which cause the connection to be cleared down after a successful connection has been established and after a predefinable period of time has elapsed, and the special resource resources are released again ,
  • a particularly advantageous application, using existing Internet infrastructures for secure writing access to a server, is that the system is provided for operating and monitoring an automation system via the Internet.
  • a connection of automation and communication technology can be designed in a simple manner such that the client has an operating and monitoring system for operating and monitoring an automation system, the Client initiates the provision of the transmission channels as a distributed object, in particular as a DCOM object, and the connection to the automation system is established via a DCOM server.
  • FIG. 1 shows a block diagram of a schematic diagram of a
  • FIG. 3 shows a further exemplary embodiment of a system: r transmission of data over the Internet from several clients to a server via an Internet connection and
  • FIG. 4 shows a block diagram of an exemplary embodiment of an automation system with Internet coupling.
  • TCP Transport Control Protocol
  • IP Internet Protocol
  • the system shown in FIG 1 consists of several clients la ..In, which 10 can establish connections 71a..7In to a server 4 via the Internet.
  • the server 4 contains special resource means 20 for establishing exactly one passive connection between the server 4 and exactly one client la..ln. In the system shown in FIG. 1 with a server 4 and several clients la..ln, it is often necessary for the clients la..ln to synchronize for access to the server 4.
  • connection 71a The successful establishment of the connection 71a is evaluated as receipt of the semaphore.
  • the client la with whom there is now a valid connection to the server 4, can now carry out critical operations.
  • the connection 71a can be terminated in that the client la clears the connection and thus releases the semaphores again, ie the resource means 20 are available for re-establishing the connection of the clients la..ln.
  • Using a TCP / IP connection as an Internet semaphore also offers the following advantages:
  • the server 4 marks the connection 71a..71n as cleared after a specific predefinable time, as a result of which the semaphore 20 is free again becomes. Time monitoring can also ensure that the client la..ln receives the semaphores 20 only for a certain period of time. If the time has expired, the server 4 automatically clears the connection. 2 shows a schematic, temporal representation of the connection establishment and connection establishment between a client 1 and a server 4. Here, the client 1 starts a connection establishment attempt 11 as requests from the semaphores.
  • a successful establishment of the connection is evaluated in step 12 as receipt of the semaphores.
  • the client can now perform operations, in particular synchronous-critical operations, in a step 13.
  • steps 14 and 15 it is characterized that by releasing the semaphores or by monitoring the time, a disconnection and thus a release of the resource 20 in the server 4 can be ensured. This is summarized in block 27 with the keyword “clearing the connection", while the connection establishment and transfer of the Internet semaphore is summarized in block 26.
  • FIG. 3 shows a further block diagram of a basic illustration of a system for transmitting data via the Internet from a client la.
  • a server 4 via Internet connections 71a..71n.
  • the Internet is again identified by reference number 10.
  • the server contains resource means 20 for establishing exactly one passive connection between the server 4 and exactly one client la..ln.
  • the special resource means 20 are part of a computer program product 21 which also has control means 16 and time monitoring means 17.
  • the control means 16 and time monitoring means 17 control the resource means 20 via a control connection identified as arrow 19 in FIG.
  • the system shown in FIG. 3 essentially corresponds to the system already explained in connection with FIG. 1, so that for an explanation of the basic principle, reference is made to the explanations for FIG.
  • the computer program product 21, which is, for example, one on the. Server 4 executable software program, on the one hand contains the special resource means for establishing exactly one passive connection between the server 4 and exactly one client la..ln, the control means 21 also causing a successful rather establishing a connection between the client la..ln and the server 4 is regarded as the preservation of the Internet semaphore.
  • the control means 16 are further provided such that they cause, after a successful connection establishment and a failure of the client with which a connection establishment was successful and / or in the event of a connection failure, the connection to be deemed to have been cleared down and the special resource means 20 become free again.
  • the time monitoring means 17 of the computer program product 21 serve to ensure that the connection 71a..71n is cleared after the successful establishment of the connection and after the expiry of a predeterminable period of time and the special resource means 20 are also released again.
  • FIG. 4 shows an exemplary embodiment of a system for operating and monitoring automation systems 5 which, for example, have programmable logic controllers (PLC), numerical controls (NC) and / or drives (drives).
  • a local intranet address which does not have to be known on the Internet, is assigned to the operating and monitoring system 1, which is also referred to below as the B&B system 1.
  • the worldwide data communication network Internet is identified by reference number 10.
  • FIG. 4 shows a client as an application, which contains an operating and monitoring system and is connected via connections 6, 7, 8, i.e. Communication to the server 4 of the automation system 5 is made possible via the first firewall computer 2, the Internet 10 and the second firewall computer 3.
  • special resource means for establishing exactly a passive connection between the server 4 and the client 1 are provided on the server 4. If the connection is successfully established via the connections 6, 7, 8 from the client 1 to the server 4, the successful establishment of the connection between the client 1 and the server 4 is in turn evaluated as the receipt of the Internet semaphore. This results in a clear synchronization between the client 1 and the server 4, which is particularly important in an application in the field of automation technology for controlling or operating and monitoring the automation system 5.
  • the invention thus relates to a system and method for transmitting data via the Internet with a TCP / IP connection as a semaphore between at least one client la. In and at least one server 4.
  • the Server 4 has resource means 20 for a connection, a successful connection establishment between a client la..ln and the server 4 is evaluated as receipt of the Internet semaphore. This ensures that the clients 1 .. In are synchronized with the server, ie that at any time only one client la .. In has, in particular, write access to the server 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer And Data Communications (AREA)

Abstract

L'invention concerne un système et un procédé de transmission de données par Internet entre au moins un client (1a .. 1n) et au moins un serveur (4), en particulier pour le service et l'observation d'un système d'automatisation. L'objectif de l'invention est de réaliser un sémaphore Internet valable dans l'ensemble du réseau. Cet objectif est atteint par le fait que le serveur (4) contient des moyens de ressource (20) pour une communication, l'établissement réussi d'une communication entre un client (1a, 1b .. 1n) et le serveur (4) prouvant la réception du sémaphore Internet. La synchronisation entre les clients (1a, 1c.. 1n) et le serveur est ainsi garantie, c.-à-d. qu'à tout moment, un seul client (1a, 1b .. 1n) a un accès, en particulier pour écriture, au serveur (4).
EP00991780A 2000-01-11 2000-12-28 Systeme et procede de transmission de donnees par internet avec communication tcp/ip comme semaphore Ceased EP1247382A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10000757 2000-01-11
DE10000757A DE10000757A1 (de) 2000-01-11 2000-01-11 System und Verfahren zur Übertragung von Daten über Internet mit TCP/IP-Verbindung als Semaphore
PCT/DE2000/004661 WO2001052500A2 (fr) 2000-01-11 2000-12-28 Systeme et procede de transmission de donnees par internet avec communication tcp/ip comme semaphore

Publications (1)

Publication Number Publication Date
EP1247382A2 true EP1247382A2 (fr) 2002-10-09

Family

ID=7627131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00991780A Ceased EP1247382A2 (fr) 2000-01-11 2000-12-28 Systeme et procede de transmission de donnees par internet avec communication tcp/ip comme semaphore

Country Status (4)

Country Link
US (1) US20020194346A1 (fr)
EP (1) EP1247382A2 (fr)
DE (1) DE10000757A1 (fr)
WO (1) WO2001052500A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7237013B2 (en) * 2001-04-16 2007-06-26 National Instruments Corporation Network system including data socket components for accessing internet semaphores
GB2407729B (en) * 2003-10-29 2005-11-23 Siemens Ag Communications apparatus and method

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US5553242A (en) * 1993-11-03 1996-09-03 Wang Laboratories, Inc. Client/server connection sharing
US5832219A (en) * 1994-02-08 1998-11-03 Object Technology Licensing Corp. Distributed object networking service
JP3448947B2 (ja) * 1994-04-11 2003-09-22 株式会社日立製作所 リモート印刷システムおよびそのリモート印刷方法
EP0733971A3 (fr) * 1995-03-22 1999-07-07 Sun Microsystems, Inc. Méthode et appareil pour gérer des connexions pour la communication entre des objets dans un système d'objets distribué
US5867653A (en) * 1996-04-18 1999-02-02 International Business Machines Corporation Method and apparatus for multi-cast based video conferencing
US5953405A (en) * 1997-02-10 1999-09-14 Genesys Telecommunications Laboratories, Inc. Agent-predictive routing process in call-routing systems
DE19808616B4 (de) * 1997-03-12 2006-03-16 Mannesmann Ag Verfahren und System zur Fernsteuerung und Informationsübertragung
US6029201A (en) * 1997-08-01 2000-02-22 International Business Machines Corporation Internet application access server apparatus and method
US6418464B1 (en) * 1998-09-25 2002-07-09 Apple Compunter, Inc. Method and apparatus for coordination of client/server processes
US6549538B1 (en) * 1998-12-31 2003-04-15 Compaq Information Technologies Group, L.P. Computer method and apparatus for managing network ports cluster-wide using a lookaside list

Non-Patent Citations (1)

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Title
See references of WO0152500A3 *

Also Published As

Publication number Publication date
WO2001052500A3 (fr) 2002-03-14
US20020194346A1 (en) 2002-12-19
DE10000757A1 (de) 2001-07-19
WO2001052500A2 (fr) 2001-07-19

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