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EP1013047A1 - Systeme serveur et procede permettant de connecter des reseaux de commande et des dispositifs a entree/sortie directes par l'intermediaire du world wide web - Google Patents

Systeme serveur et procede permettant de connecter des reseaux de commande et des dispositifs a entree/sortie directes par l'intermediaire du world wide web

Info

Publication number
EP1013047A1
EP1013047A1 EP98922310A EP98922310A EP1013047A1 EP 1013047 A1 EP1013047 A1 EP 1013047A1 EP 98922310 A EP98922310 A EP 98922310A EP 98922310 A EP98922310 A EP 98922310A EP 1013047 A1 EP1013047 A1 EP 1013047A1
Authority
EP
European Patent Office
Prior art keywords
control
control protocol
protocol format
data
generic
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Withdrawn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
EP98922310A
Other languages
German (de)
English (en)
Inventor
David Gaw
Ed Koch
Adam Marsh
Dan Hennage
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.)
Coactive Networks Inc
Original Assignee
Coactive Networks Inc
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 Coactive Networks Inc filed Critical Coactive Networks Inc
Publication of EP1013047A1 publication Critical patent/EP1013047A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G05B19/4185—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by the network communication
    • 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
    • H04L41/02—Standardisation; Integration
    • H04L41/0246—Exchanging or transporting network management information using the Internet; Embedding network management web servers in network elements; Web-services-based protocols
    • H04L41/0253—Exchanging or transporting network management information using the Internet; Embedding network management web servers in network elements; Web-services-based protocols using browsers or web-pages for accessing management information
    • 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
    • H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
    • 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
    • H04L67/34—Network arrangements or protocols for supporting network services or applications involving the movement of software or configuration parameters 
    • 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
    • H04L69/08—Protocols for interworking; Protocol conversion
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/15—Plc structure of the system
    • G05B2219/15032—Exchange objects having I-O, configuration, status, parameters, functions attributes
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24215—Scada supervisory control and data acquisition
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25057—Configuration stored in distributed database for real time use
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25083—For each subsystem a configuration
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/31—From computer integrated manufacturing till monitoring
    • G05B2219/31186—TCP-IP internet protocol
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/31—From computer integrated manufacturing till monitoring
    • G05B2219/31422—Upload, download programs, parameters from, to station to, from server
    • 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
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Definitions

  • This invention pertains generally to data communications, data processing and information retrieval in networked computer systems. More specifically, the present invention is a server system for accessing control data via web browsers over a network which receives data from a control network or direct I/O sources, translates the data to and from a generic control protocol, and manages communication of the generic control protocol with multiple clients.
  • FIG. 4 is a functional block diagram of a conventional vertically integrated control data networking system 400.
  • This system 400 comprises a plurality of client work stations 14a, 14b, 14c associated with a control network 18 by a network connection 420.
  • the control network has a plurality of devices shown generally as camera 20, air conditioner 22, motion sensor 24, temperature sensor 26 and door lock 28. A variety of device types may be associated with the control network 18.
  • the workstations 14a, 14b, 14c communicate with the control network 18 through an application 440 on the workstations which is specifically written for interfacing with the control network 18.
  • These vertically integrated control data networking systems are generally based on proprietary technologies and are not designed with open-ended architectures, and often are site- specific and device-specific. Thus, the systems lack scalability, are highly platform dependent, and are limited to specialized network architectures and protocols. As a result, these systems are not adaptable to rapidly changing computer networking technologies, and the selection of software and hardware which can be used with the systems is severely limited.
  • Control networks such as LONWORKSTM and DEVICENETTM have more recently been employed in control data networking systems. These control networks are somewhat more flexible than vertically integrated proprietary control data networking systems because LONWORKSTM and DEVICENETTM have established standards that reduce protocol conflicts and permit limited open-ended architecture.
  • LONWORKSTM and DEVICENETTM have established standards that reduce protocol conflicts and permit limited open-ended architecture.
  • networking infrastructure such as transmission media, routers and gateways is required.
  • existing control networks still lack scalability, are generally platform dependent, and are not readily adaptable to different protocols.
  • the present invention is a server system and method for networking control networks and direct input and output from devices to allow accessing of control data via the World Wide Web.
  • the system of the invention comprises a server and a plurality of embedded client applets.
  • the server includes programming which carries out the operations of receiving control data from one or more direct I/O sources and/or control networks, translating the received control data into a generic control protocol, and managing communication of the generic control protocol between the server and a plurality of clients.
  • the plurality of client applets which are embedded in a corresponding plurality of Web pages, communicate control data to the server using the generic control protocol, and present control data to client users in the form of graphical displays on the Web pages.
  • the "World Wide Web” or “Web” is a client-server hypertext information and communication system popularly used on the Internet and intranet computer networks.
  • the "Internet” is a cooperatively run, globally distributed collection of computer networks which exchange information through the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite.
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • "Hypertext” is text which is not constrained to a single linear sequence. The Web and Internet have made possible the sharing of information between computers all over the world through use of Web
  • Hypertext Transfer Protocol is the native protocol of the Web, and is used to transfer hypertext documents between computers networked through the Internet and Web. Hypertext documents are generally in the form of Hypertext Media Language (HTML) pages or Web pages.
  • OOP object oriented programming
  • Commonly used OOP languages include C++, JAVA and Smalltalk.
  • OOP provides an implementation method wherein computer programs are organized as cooperative collections of software objects, each of which represents an instance of some class, with the classes being members or a hierarchy of classes united by inheritance relationships.
  • Software objects generally comprise data fields in the form of instance variables that are encapsulated by one or more methods. Interconnected objects within a program communicate via messages.
  • the encapsulated nature of OOP allows OOP applications existing on a Web server to be downloaded to Web clients having varying types of machines and operating systems.
  • OOP JAVA is designed to be machine independent and function within different operating systems. JAVA permits scaled-down applications called "applets" which can be incorporated into Web sites and run off of individual HTML pages. JAVA applets require a JAVA-enabled browser such as the widely used NETSCAPE NAVIGATORTM and MICROSOFT EXPLORERTM browsers. Internet working systems are typically built around a set of discrete systems which may be highly integrated, yet operate as functionally separate parts.
  • the encapsulated nature of OOP lends itself well to network and communication systems in that data from one protocol can be encapsulated within methods of another protocol. The encapsulating protocols must be open ended to allow data to be translated between different protocols.
  • the present invention utilizes the World Wide Web and advantages of OOP to access such data via direct I/O of remote devices or from control networks associated with an array of devices, and to provide the data to Web clients independent of particular platforms, protocols or network architectures.
  • the server of the invention is embodied in a conventional programmed data processor such as a PC containing encoded executable instructions for carrying out program operations in accordance with the invention.
  • the server includes a plurality of interfaces, with an information network interface such as an ETHERNET TCP/IP interface, a control network interface which may be based on LONWORKS TMor DEVICENETTM standards, and a direct I/O interface.
  • the web client programs are embodied in machines or workstations such as
  • a single static JAVA client object is included per each of the plurality of HTML page.
  • GUI applets on the HTML page provide graphical user interface (GUI) applet devices or widgets which access the static JAVA client object for accessing control data.
  • the server is networked to the static JAVA client applets via conventional TCP/IP sockets.
  • TCP/IP sockets Other alternative networking means may be used as alternatives to TCP IP sockets, including distributed object method invocations, such as CORBA calls managed by an external Object Request Broker or OLE. Since the GUI applets are JAVA based and run off the HTML pages rather than being server-pushed, the applets provide for real time client user interaction.
  • the programming associated with the server includes conventional software applications for providing information and/or services to client programs according to client program requests.
  • the server of the invention also comprises programming means for carrying out the operations of:
  • the programming In performing control data translations between the generic control protocol and native control data formats, the programming preferably also provides means for carrying out the operations of identifying I/O points, identifying data points, and data formatting.
  • the translating operates in both directions, and the server architecture and programming handles control data requests and assignments from the GUI applets and control data updates and results from the control network and/or direct I/O points.
  • the server system of the invention preferably incorporates both polling and event driven methods of control data exchange.
  • the generic control protocol of the invention preferably comprises:
  • a user at a client workstation runs the web browser program and establishes a network connection with the server via modem and dial-up serial connection or other standard manner.
  • the user identifies the location or address for the desired HTML page(s) corresponding to the particular control data which the user wants to access by URL (Uniform Resource Locator) address or other standard means.
  • URL Uniform Resource Locator
  • the embedded applets on the selected HTML page(s) graphically display the control data from the remote devices and provide selectable options to the user, such as setting or parameter changes for the remote devices.
  • the user can select particular desired control data by "clicking" on the appropriate applet using a mouse, tracking ball or other conventional means. After viewing the selected control data, the user can change a setting or control on the remote device by clicking on the appropriate applet.
  • An object of the invention is to provide a server system and method for networking control networks and direct input and output which allows remote accessing of control data via the World Wide Web.
  • Another object of the invention is to provide a server system and method for networking control networks and direct input and output which has an open-ended architecture and is scalable.
  • Another object of the invention is to provide a server system and method for networking control networks and direct input and output which is platform and protocol independent.
  • Another object of the invention is to provide a server system and method for networking control networks and direct input and output which utilizes embedded applets networked to a server for communicating control data.
  • Another object of the invention is to provide a server system and method for networking control networks and direct input and output which translates native control data formats to a generic control protocol which accommodates data and I/O point identification schemes of multiple different control network protocols without losing information from any protocols.
  • Another object of the invention is to provide a server system and method for networking control networks and direct input and output which allows information flow from low level systems to higher level systems.
  • FIG. 1 is a functional block diagram of a server system for networking control networks and direct input and output in accordance with the present invention which illustrates generally the architectural components of the invention.
  • FIG. 2 is a functional block diagram of a server system for networking control networks and direct input and output in accordance with the present invention which illustrates the logical operation of the invention.
  • FIG. 3 is a functional block diagram of a server system for networking control networks and direct input and output in accordance with the present invention which illustrates a specific preferred implementation architecture for the invention.
  • the present invention is embodied in the server system generally shown in FIG. 1 through FIG. 3. It will be appreciated that the server system may vary as to configuration and as to details of the components and architecture, and that the method may vary as to details and the order of the steps without departing from the basic concepts as disclosed herein.
  • System 10 includes a server 12 and a plurality of client work stations
  • Server 12 is also networked with a control network 18 having a plurality of devices shown generally as camera 20, air conditioner 22, motion sensor 24, temperature sensor 26 and door lock 28.
  • the particular nature of devices 20-28 is exemplary, and a variety of device types which perform monitoring and/or control functions may be associated with control network 18.
  • Network connection 30 links server 12 with control network 18.
  • Network connection 30 could alternatively link with an array of direct I/O from separate devices instead of, or in addition to control network 18.
  • Server 12 is preferably a conventional programmed data processor or computer having logic circuits implemented in hardware and/or software which perform various operations, described more fully below, according to computer programming based on executable instructions encoded in a computer memory of server 12.
  • Work stations 14a- c likewise are preferably conventional programmed data processors having logic circuits implemented in hardware and/or software which support standard client applications operating with standard commercial platforms or operating systems such as WINDOWS TM MACINTOSHTM, UNIXTM, or the like.
  • Control network 18 is a local area network (LAN) based on LONWORKSTM, DEVICENETTM or like control network standards.
  • the devices 20-28 associated with control network 18 are "smart" and include a microprocessor or computer (not shown) embedded in or otherwise associated with each device 20-28.
  • the embedded microprocessors include conventional means for monitoring and communicating status and other control data of devices 20-28 to control network 18.
  • Devices 20-28 are linked within control network 18 by standard means.
  • Network connections 16a-c and 30 are standard connections which, at the physical layer, preferably comprise modems and dial-up serial connections.
  • Client workstations 14a-c each support a browser program 32 such as
  • Each work station 14a-c may support multiple browsers 32, although only one is shown for reasons of clarity.
  • Each browser 32 supports a plurality of HTML pages 34, of which only one is shown for clarity.
  • Each HTML page 34 in turn supports a plurality of embedded applets 36a-c.
  • applets 36a-c are preferably JAVA GUI applets which graphically provide user interfaces for displaying data and allowing client users to change settings or parameters of devices 20-28 from remote locations via the Web.
  • Embedded applets 36a-c and HTML page 34 are platform independent, and any browser 32 (which can support applets) as well as any type of client workstation 14a-c may be used with system 10. Likewise, the nature and configuration of control network 18 may be varied depending upon particular situations wherein system 10 is employed.
  • multiple applets 36a-c on each HTML page 32, multiple HTML pages 34 on each web browser 32, multiple web browsers 32 on each workstation 14a-c, and multiple workstations 14a-c all communicate with a single server 12 over a network.
  • Server 12 manages the client applets 36a-c on one side of system 10, and communicates with control network 18 on the other side of system 10.
  • the server 12 in accordance with the present invention translates the data from the workstations 14a-c from the platform independent form to a platform dependent form which the control network 18 can understand. Likewise, the server 12 translates the data from the control network 18 from a platform dependent form to a platform independent form which is understood by the workstations 14a-c.
  • Means for transforming control data into various desired formats or units are included with applets 36a-c, and preferably comprise suitable input and output GUI devices such as buttons, text, sliders, dials, lights, gauges, graphs (bar and/or plot) or like icons which suitably positioned on HTML pages 34a-c and which can be selected and actuated by a user via "clicking" on the GUI device with a mouse, tracking ball or like user interface device.
  • GUI devices such as buttons, text, sliders, dials, lights, gauges, graphs (bar and/or plot) or like icons which suitably positioned on HTML pages 34a-c and which can be selected and actuated by a user via "clicking" on the GUI device with a mouse, tracking ball or like user interface device.
  • control data including data aggregation, event monitoring, and data logging.
  • the communication managing means of server 12 allows communication between server 12 and multiple client workstations 14a-c, and thus multiple applets 36a-c, which may be on the same or different HTML pages 34a-c, browsers 32 or workstations 14a-c, can communicate with server 12 simultaneously.
  • FIG. 6 is a flow chart diagram of the translation of messages from the control data format to the GCP in accordance with the present invention.
  • the server 12 begins at an idle status, via step 602.
  • the server 12 fetches the control network data unit values to be updated, via step 606.
  • Conditions prompting a sending of updates include a request for updates from a client, updates which are periodically sent and updates sent based on a condition, such as the changing of a temperature past a threshold. It packs the data units into a single message via step 608, encodes the message from the control protocol format to the GCP via step 610, and then transmits the message to the proper workstations 14a-14c, via step 612.
  • the interfacing means of server 12, shown generally as control data interface program operation 46 provides a logical interface with control network 18 or other control data sources such as an array of direct I/O points.
  • Applets 36a-c are preferably JAVA GUI applets, each of which makes calls to JAVA Client Object 50 by messages 52a-c. Each JAVA GUI applet 36a-c has an associated GUI device 54, of which only one is shown for clarity. Generally, the server system of the invention will incorporate both polling and event-driven methods of control data exchange. In the preferred architecture 48, one JAVA Client Object 50 exists per HTML page 34a-c. JAVA Client Objects 50 are static, and each include an init() initialization method called by each JAVA GUI applet 36a-c which creates JAVA Client Object 50 if it not already present. Each JAVA Client Object 50 also includes update() methods that register JAVA GUI applets 36a-c for proper updates, which are preferably polling or event-driven, as related above.
  • JAVA Client Object 50 manages control data updates with server 12 and manages communications with each of the multiple JAVA GUI applets 36a-c. Each JAVA Client Object 50 sends and receives control data in Generic Control Protocol, shown as Send/Receive Control Data in GCP operation 40. Each JAVA Client Object 50 registers as a client of server 12, accepts registration from multiple JAVA GUI applets 36a-c, and establishes a set of polling or event-driven updates to be routed between JAVA GUI applets 36a-c and server 12. JAVA Client Objects 50 preferably communicate with server 12 via a plurality of TCP/TP sockets 56a-c over corresponding physical layer connections 16a-c (FIG. 1).
  • each JAVA GUI applet 36a-c registers with the
  • JAVA Client Object 50 for that particular HTML page and passes the relevant parameters to the JAVA Client Object 50. These parameters preferably include polling frequencies, event threshold values, and control data identifiers. As the JAVA Client Object 50 updates, JAVA GUI applets show changes in control data via GUI devices 54 on the HTML page 34a-c.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Computer And Data Communications (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)

Abstract

L'invention concerne un système modulable de mise en réseau de données de commande, qui présente une architecture ouverte et qui ne dépend ni de la plate-forme ni du protocole mis en oeuvre. Le serveur de ce système a accès aux données de commande par l'intermédiaire d'un explorateur Web balayant un réseau qui reçoit des données provenant d'un réseau de commande ou de sources à entrée/sortie directes; traduit les données en un protocole de commande générique et inversement; et gère la communication du protocole de commande générique avec plusieurs clients. Le serveur joue le rôle d'interface physique et réseau avec le réseau de commande ou les sources à entrée/sortie directes et traduit les données de commande originelles ou les données d'entrée/sortie directes en un format de protocole de commande générique et inversement. Le serveur remplit également la fonction de gestion de la communication avec une pluralité de clients utilisant des standards ouverts tels que le protocole TCP/IP. Une ou plusieurs applications intégrées affichent graphiquement les données de commande et permettent à l'utilisateur de contrôler et réguler les données de commande.
EP98922310A 1997-05-19 1998-05-15 Systeme serveur et procede permettant de connecter des reseaux de commande et des dispositifs a entree/sortie directes par l'intermediaire du world wide web Withdrawn EP1013047A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US4706597P 1997-05-19 1997-05-19
US47065P 1997-05-19
US7697798A 1998-05-13 1998-05-13
US76977 1998-05-13
PCT/US1998/009925 WO1998053581A1 (fr) 1997-05-19 1998-05-15 Systeme serveur et procede permettant de connecter des reseaux de commande et des dispositifs a entree/sortie directes par l'intermediaire du world wide web

Publications (1)

Publication Number Publication Date
EP1013047A1 true EP1013047A1 (fr) 2000-06-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98922310A Withdrawn EP1013047A1 (fr) 1997-05-19 1998-05-15 Systeme serveur et procede permettant de connecter des reseaux de commande et des dispositifs a entree/sortie directes par l'intermediaire du world wide web

Country Status (3)

Country Link
EP (1) EP1013047A1 (fr)
JP (1) JP2002512758A (fr)
WO (1) WO1998053581A1 (fr)

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