EP2047216A1 - Isolation unit for a conventional 2-wire communication link which comprises a sensor, a measuring transducer and a control unit - Google Patents

Isolation unit for a conventional 2-wire communication link which comprises a sensor, a measuring transducer and a control unit

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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
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EP
European Patent Office
Prior art keywords
sensor
separation unit
control unit
signals
transmitter
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Granted
Application number
EP07787554A
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German (de)
French (fr)
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EP2047216B1 (en
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
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Endress and Hauser Wetzer GmbH and Co KG
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Publication of EP2047216A1 publication Critical patent/EP2047216A1/en
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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.

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

Abstract

For a conventional 2-wire communication link which comprises a sensor 1, a measuring transducer 2 and a control unit 3, an isolation unit 6 is provided which is used for transmitting digital signals which are not transmitted by the measuring transducer 2. This means a conventional 2-wire communication link has the option of digital communication between the sensor 1 and the control unit 3.

Description

Beschreibung description
Trenneinheit für eine herkömmlicheSeparation unit for a conventional
2-Leiter-Kommunikations-verbindung, die einen Sensor, einen Messumformer und eine Steuereinheit umfasst2-wire communication connection, which includes a sensor, a transmitter and a control unit
[0001] Die Erfindung betrifft eine Trenneinheit für eine herkömmlicheThe invention relates to a separation unit for a conventional
2-Leiter- Kommunikationsverbindung, die einen Sensor, einen Messumformer und eine Steuereinheit umfasst, gemäß dem Oberbegriff des Anspruchs 1.2-wire communication link comprising a sensor, a transmitter and a control unit according to the preamble of claim 1.
[0002] In der Prozessautomatisierungstechnik werden vielfach Feldgeräte eingesetzt, die zur Erfassung und / oder Beeinflussung von Prozess variablen dienen. Beispiele für derartige Feldgeräte sind Füllstandsmessgeräte, Massendurchflussmessgeräte, Druck- und Temperaturmessgeräte, pH-Redoxpotential- Messgeräte, Leitfähigkeitsmessgeräte etc., die als Sensoren die entsprechenden Prozess variablen Füllstand, Durchfluss, Druck, Temperatur, pH-Wert bzw. Leitfähigkeitswert erfassen.In the process automation technology field devices are often used, which serve to detect and / or influencing process variables. Examples of such 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.
[0003] Zar Beeinflussung von Prozess variablen dienen so genannte Aktoren, z. B. Ventile, die den Durchfluss einer Flüssigkeit in einem Rohrleitungsabschnitt steuern oder Pumpen, die den Füllstand in einem Behälter ändern.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.
[0004] Eine Vielzahl solcher Feldgeräte wird von der Firma Endress+Hauser® hergestellt und vertrieben.A variety of such field devices is manufactured and sold by the company Endress + Hauser®.
[0005] Meist sind Feldgeräte mit übergeordneten Einheiten z. B. Leitsystemen oder Steuereinheiten verbunden. Diese übergeordneten Einheiten dienen zur Prozesssteuerung, Prozess Visualisierung, Prozessüberwachung.Most field devices with higher-level units z. B. control systems or control units connected. These higher-level units are used for process control, process visualization, process monitoring.
[0006] Die Signalübertragung zwischen den Feldgeräten und den übergeordneten Einheiten erfolgt häufig nach dem bekannten 4-20 mA Standard mittels einer 2-Leiter- Kommunikationsverbindung.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.
[0007] Handelt es sich bei den Feldgeräten um Sensoren, so werden die von ihnen erfassten Messwerte als Stromsignal über eine Signalleitung an die übergeordneten Einheiten übertragen. Der Messbereich der Sensoren wird dabei linear auf ein 4-20 mA Stromsignal abgebildet.If 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.
[0008][0008]
[0009] Vielfach sind Sensoren heute nicht direkt, sondern über einen Messumformer mit der Steuereinheit verbunden. Im Messumformer erfolgt in der Regel eine galvanische Trennung zwischen dem vom Sensor gelieferten Eingangs- und dem Ausgangssignal, das an die Steuereinheit weitergeleitet wird.In many cases, sensors are not directly connected today, but via a transmitter to the control unit. In 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.
[0010] Neben einer 4-20 mA Signalübertragung ist mit einigen Sensoren auch eine digitale bidirektionale Kommunikation möglich. In der Prozessautomatisierungstechnik erfolgt diese Kommunikation meist nach dem weit verbreiteten HART-Standard. So können Sensoren von einem Leitsystem aus konfiguriert und parametriert werden. Weiterhin können neben dem eigentlichen 4-20 mA Messwert auch Diagnoseinformationen digital zum Leitsystem übertragen werden.In addition to a 4-20 mA signal transmission is also a digital with some sensors bidirectional communication possible. In process automation technology, this communication usually takes place according to the widely used HART standard. This allows sensors to be configured and parameterized from a control system. Furthermore, in addition to the actual 4-20 mA measured value, diagnostic information can also be transmitted digitally to the control system.
[0011] Herkömmliche Messumformer mit einer galvanischen Signaltrennung erlauben jedoch nicht den Durchgang von HART Signalen. Ein HART-fähiger Sensor kann deshalb, wenn er über einen solchen Messumformer mit einem Leitsystem verbunden ist, nicht digital mit dem Leitsystem kommunizieren.However, conventional transmitters with a galvanic signal separation do not allow the passage of HART signals. Therefore, a HART-enabled sensor, when connected to a control system via such a transmitter, can not communicate digitally with the control system.
[0012] Aufgabe der vorliegenden Erfindung ist es eine Trenneinheit für eine bestehende analoge 2-Leiter- Kommunikationsverbindung zwischen einem Sensor und einer Steuereinheit anzugeben, die die oben genannten Nachteile nicht aufweisen, die insbesondere beim Einsatz herkömmlichen Messumformer zusätzlich die Übertragung von HART Signalen ermöglicht.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.
[0013] Gelöst wird diese Aufgabe durch die in Anspruch 1 angegebenen Merkmale.This object is achieved by the features specified in claim 1.
[0014] Die wesentliche Idee der Erfindung besteht darin, eine Trenneinheit für eine herkömmliche 2-Leiter- Kommunikationsverbindung vorzusehen, die zur Übertragung der Digitalsignale dient und die in Serie zu den vorhandenen Stromschleifen schaltbar ist.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.
[0015] Vorteilhafte Weiterentwicklungen sind in den Unteransprüchen angegeben.Advantageous further developments are specified in the subclaims.
[0016] In vorteilhafter Weise handelt es sich bei den Digitalsignalen um FSK-Signale.Advantageously, the digital signals are FSK signals.
[0017] Die Trenneinheit sorgt auch für eine galvanische Signaltrennung.The separation unit also ensures a galvanic signal separation.
[0018] Nachfolgend ist die Erfindung anhand eines in der Zeichnung angegebenen Ausführungsbeispiels näher erläutert.The invention is explained in more detail with reference to an embodiment shown in the drawing.
[0019] Es zeigen:[0019] FIG.
[0020] Fig. 1 schematische Darstellung einer 2-Leiter- Kommunikationsverbindung mit einem herkömmlichen Messumformer;Fig. 1 is a schematic representation of a 2-wire communication connection with a conventional transmitter;
[0021] Fig. 2 schematische Darstellung eines herkömmlichenFig. 2 is a schematic representation of a conventional
[0022] Messumformers;Transmitter;
[0023] Fig. 3 schematische Darstellung einer 2-Leiter- Kommunikationsverbindung mit einer erfindungsgemäßen Trenneinheit;Fig. 3 is a schematic representation of a 2-wire communication connection with a separation unit according to the invention;
[0024] Fig. 4 schematische Darstellung einer erfindungs-4 is a schematic representation of an inventive
[0025] gemäßen Trenneinheit gemäß einemAccording to a separation unit
[0026] ersten Ausführungsbeispiel;First embodiment;
[0027] Fig. 5 schematische Darstellung einer erfindungs- [0028] gemäßen Trenneinheit gemäß einem5 a schematic representation of an inventive According to a separation unit
[0029] zweiten Ausführungsbeispiel;Second embodiment;
[0030] Fig. 6 Detaildarstellung eines Ausführungsbeispiels nach Fig. 4.6 Detail view of an embodiment of FIG .. 4
[0031] In Fig. 1 ist eine 2-Leiter- Kommunikationsverbindung zwischen einem Sensor und einer Steuereinheit näher dargestellt.In Fig. 1, a 2-wire communication connection between a sensor and a control unit is shown in more detail.
[0032] Ein Sensor 1 (z. B. ein Temperatursensor) liefert einen 4-20 mA Messsignal über einen 2-Leiter Ll an einen Messumformer 2. Der Messumformer 2 ist über einen weiteren 2-Leiter L2 mit einer Steuereinheit 3, z. B. eine SPS, verbunden. Die Steuereinheit 3 kann z. B. in nicht näher dargestellter Weise einen Aktor z. B. ein Ventil ansteuern.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. As a PLC connected. The control unit 3 may, for. B. in a manner not shown an actuator z. B. control a valve.
[0033] Zusätzlich ist die Steuereinheit 3 über ein Bussystem 5 mit einem Leitsystem 100 verbunden. Bei dem Bussystem 5 kann es sich z. B. um einen Profibus handeln.In addition, the control unit 3 is connected via a bus system 5 with a control system 100. In the bus system 5, it may be z. B. to act a Profibus.
[0034] Im Messumformer 2 wird das vom Sensor 1 über eine erste Stromschleife S 1 kommende 4-20 mA Messsignal, das dem aktuell gemessenen Temperaturwert entspricht, vorverarbeitet z. B. linearisiert, bevor es an die Steuereinheit 3 weitergeleitet wird. Ein spezieller Messumformer, das Produkt RMA422 der Fa. Endress + Hauser weist nicht nur einen Messignaleingang sondern zwei Messsignaleingänge auf. So können bei diesem Messumformer Messsignale von zwei Sensoren z. B. verrechnet bzw. ausgewertet werden.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. A special transmitter, the RMA422 from Endress + Hauser, not only has one measuring signal input but two measuring signal inputs. Thus, with this transmitter measuring signals from two sensors z. B. be charged or evaluated.
[0035] Im Messumformer 2 erfolgt eine galvanische Trennung zwischen dem 4-20 mAIn the transmitter 2 is a galvanic isolation between the 4-20 mA
Eingangs- und 4-20 mA Ausgangssignal, das über eine zweite Stromschleife S2 an die Steuereinheit 3 weitergeleitet wird. Über das 4-20 mA Signal, der zweiten Stromschleife S2 wird der Sensor 1 versorgt, eventuell aber auch der Messumformer 2.Input and 4-20 mA output signal, which is forwarded via a second current loop S2 to the control unit 3. Via the 4-20 mA signal, the second current loop S2, the sensor 1 is supplied, but possibly also the transmitter 2.
[0036] In Fig. 2 ist ein typischer herkömmlicher Messumformer mit einer galvanischen Trennung näher dargestellt. Das vom Sensor 1 über die erste Stromschleife S 1 kommende 4-20 mA Messsignal wird an einem Messwiderstand RHART abgegriffen und in einem Analog-Digital- Wandler A/D digitalisiert. Bei dem Analog-Digital- Wandler A/D kann es sich z. B. um einen ΣΔ- Wandler handeln. Nach der Digitalisierung wird das Messsignal über eine galvanische Übertrager T einer Recheneinheit 30 (z. B. Mikrocontroller) zugeführt. In der Recheneinheit 30 erfolgt eine Verarbeitung des digitalisierten Messsignals z. B. eine Linearisierung oder eine Filterung. Nach der Verarbeitung wird das digitale Messsignal über einen Digital- Analog-Wandler D/A wieder in ein 4-20 mA Signal umgewandelt und in analoger Form über die Stromschleife S2 an die Steuereinheit 3 weitergeleitet.2, a typical conventional transmitter with a galvanic isolation is shown in more detail. 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. In the analog-to-digital converter A / D, it may be z. B. to act a ΣΔ converter. After the digitization, the measuring signal is fed via a galvanic transformer T to a computing unit 30 (eg microcontroller). In the arithmetic unit 30, a processing of the digitized measurement signal z. As a linearization or filtering. After processing, 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.
[0037] Dargestellt ist in der Figur 2 nur der Pfad für das digitalisierten 4-20 mA Signals, das mit Hilfe der Übertrager T galvanisch getrennt wird. Der Pfad für die Energieübertragung ist der Übersichtlichkeit halber nicht dargestellt. Hier ist ebenfalls eine galvanische Trennung vorgesehen.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.
[0038] Die Signalübertragung in der Übertrager T kann z. B. induktiv über ein Spulenpaar oder optisch über ein Optokopplerpaar erfolgen.The signal transmission in the transformer T can z. B. inductively via a coil pair or optically via a pair of optocouplers.
[0039] Die in herkömmlichen Messumformern eingesetzten A/D-Wandler sind so ausgelegt, dass HART-Signale nicht übertragen werden können. Die HART Kommunikation basiert auf dem Bell202 Kommunikationsstandard mit einer Kodierung nach dem FSK- Verfahren (Frequency Shift Key), bei dem die beiden digitalen Zustände 0 und 1 den folgenden Frequenzen zugeordnet werden: logisch 0 = 2200 Hertz, logisch 1 = 1200 Hertz.The A / D converters used in conventional transducers are designed so that HART signals can not be transmitted. The HART communication is based on the Bell202 communication standard with FSK coding (Frequency Shift Key), in which the two digital states 0 and 1 are assigned to the following frequencies: logical 0 = 2200 Hertz, logical 1 = 1200 Hertz.
[0040] In Fig. 3 ist eine 2-Leiter Kommunikationsverbindung gemäß Fig. 1 dargestellt, bei der zusätzlich eine erfindungsgemäße Trenneinheit 6 vorgesehen ist. Eingangsseitig ist die erfindungsgemäße Trenneinheit 6 in einen der beiden 2-Leiter Ll geschaltet; ausgangsseitig entsprechend in einen der beiden 2-Leiter L2.In 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. 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.
[0041] Der Sensor 1, der Signaleingang El der Trenneinheit 6 und der Signaleingang IN des Messumformers 2 sind Teil einer ersten 4-20 mA Stromschleife Sl. Entsprechendes gilt für die Steuereinheit 3, den Signalsausgang Al der Trenneinheit 6 und den Signalausgang OUT des Messumformers 2, die Teil einer zweiten 4-20 mA Stromschleife sind.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 same applies to the control unit 3, the signal output Al of the separation unit 6 and the signal output OUT of the transmitter 2, which are part of a second 4-20 mA current loop.
[0042] Versorgt werden die einzelnen Komponenten jeweils über den in der zweiten Stromschleife S2 fließenden Strom.The individual components are supplied in each case via the current flowing in the second current loop S2.
[0043] Der Messumformer 2 überträgt das analoge 4-20 mA Signal. Erfindungsgemäß überträgt die Trenneinheit 6 nur die HART-Signale mit einer galvanische Trennung.The transmitter 2 transmits the analog 4-20 mA signal. According to the invention, the separation unit 6 transmits only the HART signals with a galvanic isolation.
[0044] In Fig. 4 ist ein erstes Ausführungsbeispiel der Trenneinheit 6 näher dargestellt. Der Signaleingang El der Trenneinheit 6 ist mit einem HART-Modem 7a verbunden. Das HART-Modem 7a kommuniziert über einen Überträger T mit einem weiteren HART- Modem 7b. Die galvanische Trennung erfolgt im Übertrager T induktiv über jeweils zwei Spulenpaare 9a/8a bzw. 8b/9b. Das HART-Modem 7b ist mit dem Signalausgang Al der Trenneinheit 6 verbunden.4, 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.
[0045] In Fig. 5 ist eine alternative Ausgestaltung der Trenneinheit 6 näher dargestellt, die einen Signaleingang ET und einen Signalausgang Al' aufweist. Eingangsseitig ist eine HART- Anschaltung 13 mit einem DC/DC- Wandler 14 vorgesehen. Über den DC/ DC- Wandler 14 werden eine Kodiereinrichtung 10a sowie ein Mikrocontroller 11 versorgt. In der Kodiereinrichtung 10a wird das HART-Signal kodiert bzw. dekodiert. [0046] Der Mikrocontroller 11 kommuniziert mit der Kodiereinrichtung 10a zum Senden bzw. Empfangen von HART-Signalen.5, an alternative embodiment of the separation unit 6 is shown in more detail, which has a signal input ET and a signal output Al '. On the input side, a HART interface 13 with a DC / DC converter 14 is provided. About the DC / DC converter 14, a coding device 10a and a microcontroller 11 are supplied. In the encoder 10a, the HART signal is encoded or decoded. The microcontroller 11 communicates with the encoder 10a for transmitting and receiving HART signals.
[0047] Weiterhin ist der Mikrocontroller mit einer zweiten Kodiereinrichtung 10b über einen Überträger T verbunden. Der Überträger T besteht aus einem Spulenpaar bzw. aus einem Optokopplerpaar über die die Digitalsignale in einfacher Weise galvanisch getrennt übertragen werden können.Furthermore, 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.
[0048] Ausgangsseitig sind ebenfalls eine HART-Anschaltung 13 und ein DC/DC- Wandler 14 vorgesehen.On the output side, a HART interface 13 and a DC / DC converter 14 are also provided.
[0049] Das vom Sensor 1 kommende HART Signal wird von der Kodiereinrichtung 10a empfangen und in digitaler Form an den Mikrocontroller 11 weitergeleitet. Das von dem Mikrocontroller 11 generierte digitale Signal wird über ein Spulenpaar 12a, 12b, an eine Kodiereinrichtung 10b übertragen. Die Kodiereinrichtung 10b steuert die HART-Anschaltung 13 entsprechend an, damit die HART-Signale an die Steuereinheit 3 weitergeleitet werden können.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.
[0050] Über die in Fig. 4 bzw. Fig. 5 dargestellte Trenneinheiten 6 ist eine Übertragung von HART Signalen über eine galvanische Trennstrecke in einfacher Weise möglich.About the separation units 6 shown in Fig. 4 and Fig. 5, a transmission of HART signals via a galvanic isolation path in a simple manner possible.
[0051] In Fig. 6 ist das in Fig. 4 dargestellte Ausführungsbeispiel noch etwas ausführlicher dargestellt.In Fig. 6 the embodiment shown in Fig. 4 is shown in more detail.
[0052] Das vom Sensor 1 kommende HART-Signal wird am Widerstand RHART The coming from the sensor 1 HART signal is at the resistor R HART
[0053] abgegriffen, mit einem Operationsverstärker OPl verstärkt und anschließend mit einem Analog-Digital- Wandler A/Dl digitalisiert. Bevor das digitalisierte Signal dem Überträger Tl zugeführt wird, erfolgt eine Filterung mit einem Filter Fl. Nach der galvanischen Trennung mit Hilfe des Überträgers Tl wird das Signal einem Digital- Analog -Wandler D/Al zugeführt dem ein Regler Rl nachgeschaltet ist.Tapped, amplified with an operational amplifier OPl and then digitized with an analog-to-digital converter A / Dl. Before the digitized signal is supplied to the transmitter Tl, filtering takes place with a filter F1. After galvanic isolation with the aid of the transformer Tl, the signal is fed to a digital-to-analog converter D / Al, which is followed by a regulator Rl.
[0054] Die Eingangsseite der Trenneinheit wird von einer Versorgungseinheit VEl versorgt.The input side of the separation unit is supplied by a supply unit VEl.
[0055] Oben wurde beschrieben, wie das vom Sensor 1 kommende HART-SignalAbove was described how the coming from the sensor 1 HART signal
[0056] vom Signaleingang El zum Signalausgang Al über einen ersten Kanal Kl übertragen wurde.Was transmitted from the signal input El to the signal output Al via a first channel Kl.
[0057] Entsprechend ist ein zweiter Kanal K2 vorgesehen, der zur Übertragung von HART- Signale, die von der Steuereinheit 3 an den Sensor 1 gesendet werden, dient.Accordingly, 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.
[0058] Dieser Kanal besteht im Wesentlichen aus einem Operationsverstärker OP2, einem Analog-Digital- Wandler A/D2, einem Filter F2 einem Überträger T2, einem Digital- Analog-Wandler D/A2 sowie einem Regler R2.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.
[0059][0059]
[0060] Nachfolgend ist die Funktion der Erfindung näher erläutert. [0061] Mit Hilfe der erfindungsgemäßen Trenneinheit 6 ist es möglich, bei einer bestehenden herkömmlichen 2-Leiter-Kommunikationsverbindung mit einem Messumformer 2 auch HART-Signale zwischen einem Sensor und einer Steuereinheit auszutauschen. Über die Trenneinheit 6 werden dabei ausschließlich die digitalen HART-Signale übertragen. Über den herkömmlichen Messumformer 2 ausschließlich die analogen 4-20 mA Messsignale. Die Trenneinheit 6 ist dabei einfach in die beiden vorhandenen Stromschleifen S 1 und S2 zu integrieren.The function of the invention is explained in more detail below. With the help of the separation unit 6 according to the invention, 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. About the separation unit 6 while only the digital HART signals are transmitted. Only the analog 4-20 mA measurement signals via the conventional transmitter 2. The separation unit 6 is easy to integrate into the two existing current loops S 1 and S2.
[0062] Mit Hilfe der Übetrager T bzw. T' wird eine galvanische Trennung der HART- Signale in der Trenneinheit 6 realisiert. Die Signalübertragung über den Messumformer 2 erfolgt ebenfalls galvanisch getrennt.With the aid of the transformer T or T ', a galvanic separation of the HART signals in the separation unit 6 is realized. The signal transmission via the transmitter 2 is also galvanically isolated.
[0063] Die Trenneinheit 6 erlaubt es einem Anwender die volle Funktionalität des Sensors zu nutzen, da nun auch eine Parametrierung und die Auswertung von HART- Informationen vom Leitsystem 100 aus möglich ist.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.
[0064] Eine zusätzliche Versorgung muss nicht bereitgestellt werden, da die Trenneinheit 6 über die Stromschleife S2 gespeist wird.An additional supply need not be provided because the separation unit 6 is fed via the current loop S2.
[0065] Bezugszeichenliste: [0065] List of Reference Numerals:
abelle 11

Claims

Ansprücheclaims
[0001] 1. Trenneinheit für eine herkömmliche 2-Leiter-Kommunikationsverbindung, die einen Sensor, einen Messumformer und eine Steuereinheit umfasst, wobei der Messumformer, die vom Sensor über eine erste Strαnschleife eingehenden analogen Messsignale zum Zwecke der galvanischen Trennung digitalisiert und zur Übertragung an die Steuereinheit über eine zweite Strαnschleife in analoge Messsignale zurückwandelt, dadurch gekennzeichnet, das die Trenneinheit (6) zur Übertragung von Digitalsignalen zwischen dem Sensor (1) und der Steuereinheit (3) dient und eingangsseitig in die erste Strαnschleife Sl und ausgangsseitig in die zweite Strαnschleife S2 in Serie schaltbar ist.1. Separation unit for a conventional 2-wire communication link, comprising a sensor, a transmitter and a control unit, wherein the transmitter digitized by the sensor via a first Strαnschleife analog measuring signals for the purpose of galvanic isolation and for transmission to the control unit via a second Strαnschleife zurückwandelt in analog measurement signals, characterized in that the separation unit (6) for transmitting digital signals between the sensor (1) and the control unit (3) and the input side in the first Strαnschleife Sl and the output side in the second Strönschleife S2 is switchable in series.
[0002] 2. Trenneinheit nach Anspruch 1, dadurch gekennzeichnet, dass die analogen2. Separation unit according to claim 1, characterized in that the analog
Messsignale 4-20 rnA Signale sind und die Digitalsignale FSK-Signale sind.Measurement signals are 4-20 rnA signals and the digital signals are FSK signals.
[0003] 3. Trenneinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in der Trenneinheit (6) zur galvanischen Signaltrennung ein Übertrager T, T' vorgesehen ist3. Separation unit according to one of the preceding claims, characterized in that in the separation unit (6) for galvanic signal separation, a transformer T, T 'is provided
[0004] 4. Trenneinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Trenneinheit (6) einen Kanal Kl zur Übertragung der FSK-Signale vom Sensor (1) zur Steuereinheit (3) und einen Kanal K2 zur Übertragung der FSK-Signale von der Steuereinheit (3) zum Sensor (1) aufweist, wobei jeder Kanal einen A/D -Wandler, einen Filter, einen Überträger und einen D/A-Wandler aufweist.4. Separation unit according to one of the preceding claims, characterized in that the separation unit (6) has a channel Kl for transmitting the FSK signals from the sensor (1) to the control unit (3) and a channel K2 for transmitting the FSK signals from the control unit (3) to the sensor (1), each channel having an A / D converter, a filter, a transmitter and a D / A converter.
[0005] 5. Trenneinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Trenneinheit (6) über die Strαnschleife S2 gespeist wird. 5. Separation unit according to one of the preceding claims, characterized in that the separation unit (6) via the Strönschleife S2 is fed.
EP07787554.0A 2006-08-04 2007-07-16 A 2-wire communication link which comprises a sensor, a measuring transducer, an isolation unit and a control unit Not-in-force EP2047216B1 (en)

Applications Claiming Priority (2)

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DE102006036909A DE102006036909A1 (en) 2006-08-04 2006-08-04 Disconnecting unit for a conventional 2-wire communication connection comprising a sensor, a transmitter and a control unit
PCT/EP2007/057286 WO2008015096A1 (en) 2006-08-04 2007-07-16 Isolation unit for a conventional 2-wire communication link which comprises a sensor, a measuring transducer and a control unit

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EP2047216B1 EP2047216B1 (en) 2015-03-11

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US8089386B2 (en) 2012-01-03
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EP2047216B1 (en) 2015-03-11
CN101501453A (en) 2009-08-05

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