EP1195022A2 - Dispositif de transfert ethernet dote d'un automate logique programmable incorpore - Google Patents

Dispositif de transfert ethernet dote d'un automate logique programmable incorpore

Info

Publication number
EP1195022A2
EP1195022A2 EP00986279A EP00986279A EP1195022A2 EP 1195022 A2 EP1195022 A2 EP 1195022A2 EP 00986279 A EP00986279 A EP 00986279A EP 00986279 A EP00986279 A EP 00986279A EP 1195022 A2 EP1195022 A2 EP 1195022A2
Authority
EP
European Patent Office
Prior art keywords
network
router
programmable logic
logic controller
message
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Withdrawn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
EP00986279A
Other languages
German (de)
English (en)
Inventor
Richard A. Baker
Alain Marbach
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.)
Schneider Automation SAS
Schneider Electric USA Inc
Original Assignee
Schneider Automation SAS
Schneider Automation 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 Schneider Automation SAS, Schneider Automation Inc filed Critical Schneider Automation SAS
Publication of EP1195022A2 publication Critical patent/EP1195022A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/35—Switches specially adapted for specific applications
    • H04L49/351—Switches specially adapted for specific applications for local area network [LAN], e.g. Ethernet switches
    • 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
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • 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
    • G05B2219/15018—Communication, serial data transmission, modem

Definitions

  • This invention relates to an ethernet transfer device with an embedded programmable logic controller.
  • ethernet transfer controllers and programmable logic controllers are individually known.
  • PLCs programmable logic controllers
  • ethernet hubs or
  • N programmable logic controller which comprises a router having a router backplane which is connected to the programmable logic controller.
  • the router backplane is further comiected to a plurality of network ports.
  • the programmable logic controller or network port communicates the network message to the router and the router communicates the network message only to the programmable logic controller or the network port for which the network message is intended.
  • the network port or programmable logic controller for which the network message is intended may comprise a plurality of network ports, a plurality of programmable logic controllers, a single network port or a single programmable logic controller.
  • Also disclosed is a method of transmitting a message in a programmable logic controller comprising the steps of providing a router having a router backplane, providing a programmable logic controller connected to the router backplane, providing a plurality of network ports connected to the router backplane, communicating a network message from one of the network ports or the programmable logic controller to the router, and communicating the network message from the router to only an intended destination and an apparatus for performing the method.
  • FIG.l is a diagram of the programmable logic controller according to the present invention.
  • PLC programmable logic controller
  • the plurality of network ports 14 and the PLC 12 generally comprise a network 17.
  • the PLC 12 comprises three sections: a PLC communications section 18, a PLC section 20 and a PLC backplane driver 22.
  • the PLC 12 may be implemented either as dedicated hardware for performing its function or may be implemented as software running on a general purpose computer.
  • the PLC communications section 18 comprises user interface necessary to control the PLC 12.
  • the PLC section 20 processes input data about a system or process to be controlled and generates output data for controlling that system or process.
  • the PLC backplane driver 22 receives network messages from the router 15 through the router backplane 16 and forwards the input data from the network message to the PLC section 20.
  • the PLC backplane driver 22 also receives output data from the PLC section 20 and forwards the output data in a network message to the router 15 through the router backplane 16.
  • FIG. 1 depicts only one PLC 12, it will be readily apparent and understood by one of ordinary skill in the art that any number of PLCs 12 could be implemented in the present device 10. Multiple PLCs 12 in the present device 10 would allow for close coupling of two PLCs 12 in a distributed control application.
  • the PLC 12 instead of connecting the PLC 12 to the router backplane 16, the PLC 12 could be embedded within the router 15. However, in both instances the manner of operation remains the same.
  • the plurality of network ports 14 each comprise an ethernet driver
  • the processing unit 26 through the ethernet driver 24 and the network backplane driver 24, receive network messages from the router 15 through the router backplane 16 and forward the network messages to an ethernet subnetwork 30 to which the ethernet driver 24 is connected.
  • the processing unit 26 also receives network messages from the ethernet subnetwork 30 and forwards the network messages to the router 15 through the router backplane 16.
  • the ethernet subnetwork 30 comprises at least one network device 32.
  • N network device 32 can be a personal computer, a simple input/output device, a data relay or any other device capable of communicating on a network.
  • the router 15 queries the network ports 17 and the PLCs 12 to determine a Media Access Control (MAC) address associated with every network device 32. In this manner, the router 15 knows at least the MAC address of every network device 32 to which it is comiected. Because the router 15 knows on which ethernet subdomain 30 every network device 32 is connected, when the router 15 receives a network message from one of the network ports 14 or the PLC 12, the router 15 forwards the network message only to the ethernet subdomain 30 where the message's intended destination is attached. If the router 15 receives a network message from the ethernet subdomain 30 to which the intended destination is also connected, the router 15 merely disregards the network message and does not forward it to another ethernet subdomain 30 or the PLC 12.
  • MAC Media Access Control
  • the message's intended destination could be all of the network ports 14 and the PLC 12, if the message was a broadcast message intended for all of the network ports 14 and PLC 12, or less than all of the network ports 14 or the PLC 12 if the network message was intended for less than all of the network ports 14 and/or PLCs 12, as is most common.
  • network ports 14 or PLCs 12 for which a network message was not intended do not receive the network message.
  • network message traffic is reduced within the ethernet subdomains 30 which do not have a network device 32 which is an intended destination of the network message. Ethernet subdomains 30 which do not receive the network message, therefore, are free to transmit network messages without data collision. However, data collisions may still occur when the ethernet subdomain 30 contains more than one network device 32. Therefore, the effect of the present invention is best realized when the ethernet subdomain 30 comprises only one network device 32.
  • the device 10 is preferably connected to network devices 32 by electrical wires and the network messages are preferably electrical signals.
  • the present invention can be easily adapted to accept fiber optical cables to connect the network devices 32 to the device 10 which transmit light pulses as the network messages. While the specific embodiments have been illustrated and described, numerous modifications come to mind without significantly departing from the spirit of the invention, and the scope of protection is only limited by the scope of the accompanying claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Programmable Controllers (AREA)

Abstract

L'invention concerne un automate logique programmable qui comprend un routeur comportant un fond de panier de routeur, connecté audit automate. En outre, ce fond de panier est connecté à plusieurs ports réseau. L'automate logique programmable ou port réseau communique le message réseau au routeur, lequel communique ce message uniquement à l'automate logique programmable ou au port réseau auquel le message est destiné.
EP00986279A 1999-12-31 2000-12-07 Dispositif de transfert ethernet dote d'un automate logique programmable incorpore Withdrawn EP1195022A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US47710899A 1999-12-31 1999-12-31
US477108 1999-12-31
PCT/US2000/033189 WO2001050678A2 (fr) 1999-12-31 2000-12-07 Dispositif de transfert ethernet dote d'un automate logique programmable incorpore

Publications (1)

Publication Number Publication Date
EP1195022A2 true EP1195022A2 (fr) 2002-04-10

Family

ID=23894574

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00986279A Withdrawn EP1195022A2 (fr) 1999-12-31 2000-12-07 Dispositif de transfert ethernet dote d'un automate logique programmable incorpore

Country Status (4)

Country Link
EP (1) EP1195022A2 (fr)
CA (1) CA2362435A1 (fr)
MX (1) MXPA01008829A (fr)
WO (1) WO2001050678A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070019641A1 (en) 2005-07-22 2007-01-25 Rockwell Automation Technologies, Inc. Execution of industrial automation applications on communication infrastructure devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5159673A (en) * 1990-03-22 1992-10-27 Square D Company Apparatus for networking programmable logic controllers to host computers
US6097705A (en) * 1997-01-06 2000-08-01 Cabletron Systems, Inc. Buffered repeater with independent ethernet collision domains
US6321272B1 (en) * 1997-09-10 2001-11-20 Schneider Automation, Inc. Apparatus for controlling internetwork communications

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0150678A3 *

Also Published As

Publication number Publication date
WO2001050678A3 (fr) 2002-01-24
CA2362435A1 (fr) 2001-07-12
MXPA01008829A (es) 2002-06-21
WO2001050678A2 (fr) 2001-07-12

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