EP2412126A1 - Système de communication à résistance terminale sélective en fréquence - Google Patents

Système de communication à résistance terminale sélective en fréquence

Info

Publication number
EP2412126A1
EP2412126A1 EP09779211A EP09779211A EP2412126A1 EP 2412126 A1 EP2412126 A1 EP 2412126A1 EP 09779211 A EP09779211 A EP 09779211A EP 09779211 A EP09779211 A EP 09779211A EP 2412126 A1 EP2412126 A1 EP 2412126A1
Authority
EP
European Patent Office
Prior art keywords
frequency spectrum
receiver
pass filter
bus
master
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Withdrawn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
EP09779211A
Other languages
German (de)
English (en)
Inventor
Bernhard Wiesgickl
Stefan Wiesgickl
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 EP2412126A1 publication Critical patent/EP2412126A1/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Withdrawn legal-status Critical Current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]
    • H04L12/40—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]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • 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
    • H04L12/40006—Architecture of a communication node
    • H04L12/40032—Details regarding a bus interface enhancer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0298—Arrangement for terminating transmission lines
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/06—Frequency selective two-port networks including resistors
    • 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
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40254—Actuator Sensor Interface ASI

Definitions

  • the invention relates to a system for communication on at least two channels, the system comprising a system bus, a first receiver, a second receiver and a master, which is connected via the system bus to the first receiver and the second receiver.
  • the devices are connected via their communication line with a master module.
  • This master usually controls the logical and temporal behavior of the data flow on the communication line, thereby enabling a bundled, structured data flow.
  • the data connection via a system bus, such as AS-Interface is usually chosen instead of a parallel wiring, which is very time-consuming and error-prone, in particular during installation and maintenance.
  • the communication via such system buses usually takes place within a predefined communication channel, which is described by a defined communication frequency spectrum.
  • the devices can communicate with each other or with the master.
  • the communication frequency spectrum is between 40 kHz and 500 kHz.
  • the system bus must not have a terminating resistor for this frequency spectrum.
  • a bus system used usually has fixed framework conditions. 200904339
  • the AS-Interface bus system is designed, for example, such that no bus terminating resistor is necessary or permissible up to a maximum specified length extension. Thus, only a defined frequency spectrum may be used for the specified AS-Interface bus system, for which no terminating resistor must be present on the communication bus.
  • the transmission capacity is to be increased in the case of the AS-Interface bus system, this is only possible by using a higher frequency range for reasons of compatibility with the existing bus system.
  • the achievable transmission rate / quality in a higher frequency range is far removed from the optimum without bus termination.
  • the invention is therefore based on the object to increase the transmission capacity of a bus system.
  • the solution of the object is achieved by a system for communication on at least two channels, wherein the system a system bus, a master, which is connected via the system bus to a first receiver, a second receiver and a first termination unit, the first receiver, which is formed on a first channel in a first frequency spectrum over the system bus to communicate with the master, the second receiver, which is adapted to a second channel in a second frequency spectrum, which is above the first frequency spectrum, via the system bus to the master
  • the final high-pass filter is dimensioned in such a way that it reads through the second frequency spectrum almost unattenuated and largely blocks the first frequency spectrum.
  • the system bus represents an "open system" for communication on the first channel and a system bus with a terminating resistor for the second channel
  • a channel is defined here in each case by a frequency spectrum.
  • a system which is usually designed for one channel, can be expanded by a second channel. Larger amounts of data can thus be transferred. As a result, better qualities, faster cycles, larger data blocks can be achieved for the communication. This represents a huge improvement to the system.
  • the respective frequency spectra can be received via the first and second receivers.
  • the high-pass filter is designed such that it reads through the second frequency spectrum almost unattenuated and largely blocks the first frequency spectrum, the second frequency spectrum can be absorbed by the terminating resistor. Unwanted reflections can thus be avoided. As a result, the quality of the communication on the second channel can be improved enormously and the requirements of the first channel can also be met.
  • the second receiver is preceded by a second high-pass filter on the input side. 200904339
  • the master for the second channel has a third high-pass filter.
  • the third high-pass filter is dimensioned such that it derives the second frequency spectrum approximately unattenuated and largely blocks the first frequency spectrum.
  • system is provided for an AS-Interface bus system.
  • the first channel is used by the usual frequency spectrum of AS-Interface. This is in a frequency spectrum of about 40 kHz to 400 kHz.
  • An additional transmission channel, second channel now uses an overlying frequency spectrum, which is preferably between about 4 MHz to 20 MHz.
  • the system thus forms for the first channel a system bus without a terminating resistor and for the second channel, through the terminating unit, a system bus with a terminating resistor.
  • the transmission quality and the transmission data can be increased.
  • the manufacturer, installer, end user, etc. are thereby offered completely new possibilities for the design of an AS-Interface bus system. 200904339
  • system bus is formed by a two-wire line.
  • improved communication can take place on a first frequency spectrum and a second frequency spectrum.
  • the first frequency spectrum is between 40 kHz to 500 kHz.
  • the second frequency spectrum is between 4 MHz to 20 MHz.
  • the system bus has a terminating resistor for the second channel
  • the second frequency spectrum can be used. An increase in quality and communication improvement is achieved hereby.
  • the first high-pass filter and, if present, the second and third high-pass filters have a cutoff frequency of more than 2 MHz.
  • the first high-pass filter and, if present, the second and third high-pass filters are formed by a series resonant circuit.
  • Resonance frequency of the series resonant circuit between 6 MHz and 10 MHz, preferably at 8 MHz.
  • a series resonant circuit at 8 MHz forms an optimum high-pass filter.
  • Bus system with a termination unit 2 shows a schematic embodiment of another AS-Interface bus system
  • FIG. 3 shows a schematic embodiment of the termination unit 5 shown in FIG.
  • the system is in this case formed by an AS-Interface bus system which comprises a master 2, a first receiver 3, a second receiver 4 and the termination unit 5.
  • the respective devices are connected to each other via a system bus 1.
  • the termination unit 5 in this case has a high-pass filter 6 and a downstream terminating resistor 7.
  • the first frequency spectrum is used.
  • the master 2 wishes to communicate with the second receiver 4, it uses the second channel and thus the second frequency spectrum.
  • the first frequency spectrum is between 40 kHz and 500 kHz.
  • the second frequency spectrum can be, for example, between 4 MHz to 20 MHz.
  • the terminating resistor 5 With the aid of the high-pass filter 6, the second frequency spectrum is separated from the first frequency spectrum and derived to a terminating resistor 7.
  • the terminating resistor 7 can thus absorb the signals of the second frequency spectrum and avoid reflections.
  • both a communication on the first channel and a communication on the second channel can take place.
  • the AS-Interface bus system comprises a master 2, a first receiver 3, a second receiver 4, a slave 10 and a termination unit 5.
  • the respective components are connected to one another via a system bus 1.
  • the system bus 1 is realized by a two-wire cable. On the system bus 1 one communication takes place on two channels.
  • the first communication channel to a first frequency spectrum, which is below a second frequency spectrum of the second channel.
  • the master 2 can communicate with the second receiver 4 via the second frequency spectrum and communicate with the first receiver 3 via the first frequency spectrum.
  • the termination unit 5, which has a high-pass filter 6 and a downstream terminating resistor 7, enables the bus system 1 for the first 200904339
  • the Communication channel forms a system without terminating resistor and forms a system with a terminating resistor 7 for the second communication channel.
  • the first communication channel in this case represents the usual communication channel of the AS-Interface bus system, which is usually between 50 kHz to 500 kHz.
  • the termination unit 5 thus enables additional communication through the second communication channel on the system bus 1. For example, higher data rates and better quality can be achieved.
  • a third high-pass filter 9 is integrated within the master 2 here.
  • the second communication channel can be specifically derived.
  • the second receiver 4 also has a second high-pass filter 8. This allows him, as well as the master 2, specifically derive the second frequency spectrum.
  • a required data processing can be enormously simplified as well as an increase in quality.
  • a slave 10 to which sensors and / or actuators are usually connected in this case has a first receiver 3 and a second receiver 8.
  • a communication on the first channel and also on the second channel between the master 2 and the slave 10 can take place via the system bus 1. Higher data rates can thus be realized.
  • FIG. 3 shows a schematic embodiment of the termination unit 5 shown in FIG. 2, which is connected to a system bus 1 of the AS-Interface bus system.
  • the system bus 1 is formed slaughteradrig and has a + line 12 and a line 13.
  • the termination unit 5 in this case has a high-pass filter and a terminating resistor 7.
  • the high-pass filter is formed in this case as a series resonant circuit 17, so that the termination unit 5 is formed by a heavily damped series resonant circuit.
  • the series resonant circuit 17 is in this case formed by a capacitor 11 with 68 pF and a coil 14 with 8 uH. 200904339
  • the terminating resistor 7 is in this case formed by a first resistor 15 with 82 ohms and a second resistor 16 with 470 ohms.
  • a series resonant circuit 17 is formed with approximately 8 MHz resonance frequency.
  • the second communication spectrum is derived by the series resonant circuit 14 and can be absorbed by the terminating resistor 7.
  • the first frequency spectrum will not influence this.
  • An embodiment of the first, second or third high-pass filter by the series resonant circuit 17 has the advantage that the high-frequency second frequency spectrum, the second channel, can be optimally derived.

Landscapes

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

Abstract

L'invention concerne un système destiné à la communication sur au moins deux canaux, le système comportant un bus de système (1), un premier récepteur (3), un deuxième récepteur (4) et un maître (2) relié au premier récepteur (3) et au deuxième récepteur (4) par le bus de système. Afin d'augmenter la capacité de transmission d'un système de bus de ce type, le système comprend en outre une unité terminale (5), le maître (2) étant également relié à l'unité terminale (5) par le bus de système (1) et l'unité terminale (5) présentant un premier filtre passe-haut (6) et une résistance terminale (7) en aval du premier filtre passe-haut (6), lequel est dimensionné de manière à laisser passer presque sans l'affaiblir le deuxième spectre de fréquences et à bloquer dans une large mesure le premier spectre de fréquences.
EP09779211A 2009-03-26 2009-03-26 Système de communication à résistance terminale sélective en fréquence Withdrawn EP2412126A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/053595 WO2010108547A1 (fr) 2009-03-26 2009-03-26 Système de communication à résistance terminale sélective en fréquence

Publications (1)

Publication Number Publication Date
EP2412126A1 true EP2412126A1 (fr) 2012-02-01

Family

ID=40785436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09779211A Withdrawn EP2412126A1 (fr) 2009-03-26 2009-03-26 Système de communication à résistance terminale sélective en fréquence

Country Status (2)

Country Link
EP (1) EP2412126A1 (fr)
WO (1) WO2010108547A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5517487A (en) * 1993-07-19 1996-05-14 Modicon, Inc. System for increasing the capacity of existing local area networks that use shielded twisted wire pair medium
US6192399B1 (en) * 1997-07-11 2001-02-20 Inline Connections Corporation Twisted pair communication system
US6959356B2 (en) * 2001-07-30 2005-10-25 Fisher-Rosemount Systems, Inc. Multi-protocol field device and communication method
DE102006047259B4 (de) * 2006-10-04 2015-08-06 Bihl+Wiedemann Gmbh Schnelles Bussystem auf AS Interface Basis

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010108547A1 *

Also Published As

Publication number Publication date
WO2010108547A1 (fr) 2010-09-30

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