EP2047216A1 - Unité de séparation pour une connexion de communication traditionnelle à deux conducteurs qui comprend un capteur, un transformateur de mesure et une unité de commande - Google Patents

Unité de séparation pour une connexion de communication traditionnelle à deux conducteurs qui comprend un capteur, un transformateur de mesure et une unité de commande

Info

Publication number
EP2047216A1
EP2047216A1 EP07787554A EP07787554A EP2047216A1 EP 2047216 A1 EP2047216 A1 EP 2047216A1 EP 07787554 A EP07787554 A EP 07787554A EP 07787554 A EP07787554 A EP 07787554A EP 2047216 A1 EP2047216 A1 EP 2047216A1
Authority
EP
European Patent Office
Prior art keywords
sensor
separation unit
control unit
signals
transmitter
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.)
Granted
Application number
EP07787554A
Other languages
German (de)
English (en)
Other versions
EP2047216B1 (fr
Inventor
Michael Korn
Michael Konrad
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.)
Endress and Hauser Wetzer GmbH and Co KG
Original Assignee
Endress and Hauser Wetzer GmbH and Co KG
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 Endress and Hauser Wetzer GmbH and Co KG filed Critical Endress and Hauser Wetzer GmbH and Co KG
Publication of EP2047216A1 publication Critical patent/EP2047216A1/fr
Application granted granted Critical
Publication of EP2047216B1 publication Critical patent/EP2047216B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage

Definitions

  • 2-wire communication connection which includes a sensor, a transmitter and a control unit
  • the invention relates to a separation unit for a conventional
  • 2-wire communication link comprising a sensor, a transmitter and a control unit according to the preamble of claim 1.
  • field devices are often used, which serve to detect and / or influencing process variables.
  • field devices are level gauges, mass flow meters, pressure and temperature measuring devices, pH redox potential measuring devices, conductivity meters, etc., which detect the corresponding process variable level, flow, pressure, temperature, pH or conductivity value as sensors.
  • Tsar influencing process variables serve so-called actuators, eg. As valves that control the flow of a liquid in a pipe section or pumps that change the level in a container.
  • the signal transmission between the field devices and the higher-level units is often carried out according to the known 4-20 mA standard by means of a 2-wire communication link.
  • the field devices are sensors, the measured values acquired by them are transmitted as a current signal via a signal line to the higher-level units.
  • the measuring range of the sensors is linearly mapped to a 4-20 mA current signal.
  • sensors are not directly connected today, but via a transmitter to the control unit.
  • the transmitter there is usually a galvanic isolation between the input and the output signal supplied by the sensor, which is forwarded to the control unit.
  • Object of the present invention is to provide a separation unit for an existing analog 2-wire communication connection between a sensor and a control unit, which do not have the disadvantages mentioned above, which also allows the transmission of HART signals especially when using conventional transmitter.
  • the essential idea of the invention is to provide a separation unit for a conventional 2-wire communication connection, which serves to transmit the digital signals and which is switchable in series with the existing current loops.
  • the digital signals are FSK signals.
  • the separation unit also ensures a galvanic signal separation.
  • FIG. 1 [0019]
  • Fig. 1 is a schematic representation of a 2-wire communication connection with a conventional transmitter
  • Fig. 2 is a schematic representation of a conventional
  • Fig. 3 is a schematic representation of a 2-wire communication connection with a separation unit according to the invention.
  • a 2-wire communication connection between a sensor and a control unit is shown in more detail.
  • a sensor 1 (eg a temperature sensor) provides a 4-20 mA measurement signal via a 2-wire L1 to a transmitter 2.
  • the transmitter 2 is connected via a further 2-wire L2 with a control unit 3, z.
  • the control unit 3 may, for. B. in a manner not shown an actuator z. B. control a valve.
  • control unit 3 is connected via a bus system 5 with a control system 100.
  • bus system 5 it may be z. B. to act a Profibus.
  • the transmitter 2 In the transmitter 2, the coming from the sensor 1 via a first current loop S 1 4-20 mA measurement signal corresponding to the currently measured temperature value, preprocessed z. B. linearized before it is forwarded to the control unit 3.
  • the 4-20 mA measurement signal coming from the sensor 1 via the first current loop S 1 is tapped off at a measuring resistor R HART and digitized in an analog-to-digital converter A / D.
  • the analog-to-digital converter A / D it may be z. B. to act a ⁇ converter.
  • the measuring signal is fed via a galvanic transformer T to a computing unit 30 (eg microcontroller).
  • a processing of the digitized measurement signal z As a linearization or filtering.
  • the digital measurement signal is converted back into a 4-20 mA signal via a digital-to-analog converter D / A and forwarded in analog form via the current loop S2 to the control unit 3.
  • FIG. 2 Only the path for the digitized 4-20 mA signal is shown in FIG. 2 is galvanically isolated with the aid of the transformer T. The path for the energy transfer is not shown for clarity. Here is also provided a galvanic isolation.
  • the signal transmission in the transformer T can z. B. inductively via a coil pair or optically via a pair of optocouplers.
  • the A / D converters used in conventional transducers are designed so that HART signals can not be transmitted.
  • FIG. 3 a 2-wire communication connection according to FIG. 1 is shown, in which an additional separation unit 6 according to the invention is provided.
  • the separation unit 6 according to the invention On the input side, the separation unit 6 according to the invention is connected in one of the two 2-wire L1; on the output side corresponding to one of the two 2-wire L2.
  • the sensor 1, the signal input El of the separation unit 6 and the signal input IN of the transmitter 2 are part of a first 4-20 mA current loop Sl.
  • the individual components are supplied in each case via the current flowing in the second current loop S2.
  • the transmitter 2 transmits the analog 4-20 mA signal.
  • the separation unit 6 transmits only the HART signals with a galvanic isolation.
  • a first embodiment of the separation unit 6 is shown in more detail.
  • the signal input El of the separation unit 6 is connected to a HART modem 7a.
  • the HART modem 7a communicates via a transmitter T with another HART modem 7b.
  • the electrical isolation takes place in the transformer T inductively via two pairs of coils 9a / 8a and 8b / 9b.
  • the HART modem 7b is connected to the signal output A1 of the separation unit 6.
  • an alternative embodiment of the separation unit 6 is shown in more detail, which has a signal input ET and a signal output Al '.
  • a HART interface 13 with a DC / DC converter 14 is provided on the input side.
  • a coding device 10a and a microcontroller 11 are supplied.
  • the HART signal is encoded or decoded.
  • the microcontroller 11 communicates with the encoder 10a for transmitting and receiving HART signals.
  • the microcontroller is connected to a second encoder 10b via a transmitter T.
  • the transmitter T consists of a pair of coils or of a pair of optocouplers over which the digital signals can be transmitted galvanically separated in a simple manner.
  • a HART interface 13 and a DC / DC converter 14 are also provided.
  • the HART signal coming from the sensor 1 is received by the encoder 10a and forwarded in digital form to the microcontroller 11.
  • the digital signal generated by the microcontroller 11 is transmitted to a coding device 10b via a coil pair 12a, 12b.
  • the coding device 10b controls the HART interface 13 accordingly, so that the HART signals can be forwarded to the control unit 3.
  • Fig. 6 the embodiment shown in Fig. 4 is shown in more detail.
  • the input side of the separation unit is supplied by a supply unit VEl.
  • a second channel K2 is provided, which is used to transmit HART signals that are sent from the control unit 3 to the sensor 1.
  • This channel consists essentially of an operational amplifier OP2, an analog-to-digital converter A / D2, a filter F2 a transmitter T2, a digital-to-analog converter D / A2 and a controller R2.
  • the function of the invention is explained in more detail below.
  • the separation unit 6 it is possible to exchange HART signals between a sensor and a control unit in an existing conventional 2-wire communication connection with a transmitter 2.
  • the separation unit 6 is easy to integrate into the two existing current loops S 1 and S2.
  • the separation unit 6 allows a user to use the full functionality of the sensor, since now a parameterization and the evaluation of HART information from the control system 100 is possible.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

La présente invention concerne une unité de séparation pour une connexion de communication traditionnelle à deux conducteurs qui comprend un capteur 1, un transformateur de mesure 2 et une unité de commande 3, l'unité de séparation servant à la transmission de signaux numériques qui ne sont pas transmis par le transformateur de mesure 2. Ainsi il est possible de réaliser pour des connexions de communication traditionnelles à deux conducteurs une communication numérique entre le capteur 1 et l'unité de commande 3.
EP07787554.0A 2006-08-04 2007-07-16 Une connexion de communication traditionnelle à deux conducteurs qui comprend un capteur, un transformateur de mesure, une unité de séparation et une unité de commande Not-in-force EP2047216B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006036909A DE102006036909A1 (de) 2006-08-04 2006-08-04 Trenneinheit für eine herkömmliche 2-Leiter-Kommunikations-verbindung, die einen Sensor, einen Messumformer und eine Steuereinheit umfasst
PCT/EP2007/057286 WO2008015096A1 (fr) 2006-08-04 2007-07-16 Unité de séparation pour une connexion de communication traditionnelle à deux conducteurs qui comprend un capteur, un transformateur de mesure et une unité de commande

Publications (2)

Publication Number Publication Date
EP2047216A1 true EP2047216A1 (fr) 2009-04-15
EP2047216B1 EP2047216B1 (fr) 2015-03-11

Family

ID=38829401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07787554.0A Not-in-force EP2047216B1 (fr) 2006-08-04 2007-07-16 Une connexion de communication traditionnelle à deux conducteurs qui comprend un capteur, un transformateur de mesure, une unité de séparation et une unité de commande

Country Status (5)

Country Link
US (1) US8089386B2 (fr)
EP (1) EP2047216B1 (fr)
CN (1) CN101501453A (fr)
DE (1) DE102006036909A1 (fr)
WO (1) WO2008015096A1 (fr)

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US20170090002A9 (en) * 2006-04-26 2017-03-30 Endress + Hauser Conducta Gesellschaft Fur Mess - Und Regeltechnik Mbh + Co. Kg Sensor for a Measuring Point and Method for Testing a Sensor for a Measuring Point
EP2090946B1 (fr) 2008-02-14 2011-04-06 Siemens Aktiengesellschaft Procédé et dispositif d'enregistrement et d'émission de signaux dans des composants d'automatisation sécurisés
US8195590B1 (en) 2008-09-17 2012-06-05 Varec, Inc. Method and system for measuring and managing inventory of product in a collapsible tank
DE202010010172U1 (de) 2010-07-14 2011-10-20 Babel Management Consulting Sensor zur Flüssigkeits- oder Gasanalyse
US9274535B2 (en) 2010-09-29 2016-03-01 Siemens Aktiengesellschaft Current to voltage converter, arrangement comprising the converter and method for converting an input current to an output voltage
US9513152B1 (en) 2011-12-20 2016-12-06 Varec, Inc. Liquid level transmitter utilizing low cost, capacitive, absolute encoders
FR2990506B1 (fr) * 2012-05-14 2014-04-25 Schneider Electric Ind Sas Detecteur a sortie astable
US9544027B2 (en) * 2014-02-19 2017-01-10 Texas Instruments Incorporated Loop powered transmitter with a single tap data isolation transformer and unipolar voltage converters
DE102015105887A1 (de) * 2015-04-17 2016-10-20 Endress + Hauser Process Solutions Ag Verfahren zum automatischen Hinzu- oder Wegschalten eines Kommunikationswiderstandes eines HART-Gerätes
DE102022123352A1 (de) * 2022-09-13 2024-03-14 Turck Holding Gmbh Signalübertragungssystem zur Übertragung einer Hauptprozessvariablen und weiteren Daten zwischen einem Feldgerät und einer übergeordneten Einheit sowie ein entsprechendes Verfahren

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DE19646219A1 (de) * 1996-06-17 1997-12-18 Conducta Endress & Hauser Schaltung für die Kommunikation externer Geräte mit einer zentralen/dezentralen Datenverarbeitungsanlage über einen Bus
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Also Published As

Publication number Publication date
CN101501453A (zh) 2009-08-05
WO2008015096A1 (fr) 2008-02-07
US8089386B2 (en) 2012-01-03
DE102006036909A1 (de) 2008-02-07
US20090303090A1 (en) 2009-12-10
EP2047216B1 (fr) 2015-03-11

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