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EP1440290B1 - Measuring transducer - Google Patents

Measuring transducer Download PDF

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Publication number
EP1440290B1
EP1440290B1 EP02802603A EP02802603A EP1440290B1 EP 1440290 B1 EP1440290 B1 EP 1440290B1 EP 02802603 A EP02802603 A EP 02802603A EP 02802603 A EP02802603 A EP 02802603A EP 1440290 B1 EP1440290 B1 EP 1440290B1
Authority
EP
European Patent Office
Prior art keywords
signal
measuring transducer
error message
control input
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.)
Expired - Lifetime
Application number
EP02802603A
Other languages
German (de)
French (fr)
Other versions
EP1440290A2 (en
Inventor
Hartmut Flämig
Andreas Muhr
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
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of EP1440290A2 publication Critical patent/EP1440290A2/en
Application granted granted Critical
Publication of EP1440290B1 publication Critical patent/EP1440290B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • the invention relates to a measuring transducer with a sensor for converting a measured quantity detected thereby into an electrical sensor signal, with a signal processing device which is designed to process the sensor signal into a measuring signal and to generate an error message signal, and with a data interface for transmitting the measuring signal and error message signal.
  • a pressure transducer has a pressure sensor whose sensor signal is amplified, digitized, evaluated and corrected in terms of linearity and temperature behavior in a signal converter's own signal processing device.
  • the thus prepared measurement signal is transmitted via a data interface, eg., PROFIBUS or HART, the communication system of a technical system in which the transmitter is installed. If hardware or software errors occur in the transmitter, this will be displayed on the transmitter, with the error also being provided as digital diagnostic information at the data interface. In the case of a 4 ... 20 mA interface, the error can also be transmitted analogously in the form of a current value outside of this predetermined signal level range, in accordance with NAMUR recommendation NE43, for example.
  • B. as Downscale value of ⁇ 3.6 mA or as Upscale value of> 21 mA.
  • the patent US-A-5,874,895 discloses a transmitter with a data interface for the excitation of a measurement signal and an error message signal.
  • the invention has for its object to be able to easily report occurring outside the transmitter error events.
  • the object is achieved in that the measuring transducer of the type mentioned has a different from the data interface control input, via which the generation of the error message signal can be triggered.
  • the error signal detected outside the transmitter is thus used by the control input of the transmitter in order to generate an error message signal from it and transmit it via the data interface.
  • the generation of the error message signal is triggered by short-circuiting the control input, so no control signal must be generated.
  • a current path in the control input can be interrupted to generate the error message signal.
  • the transmitter is preferably operable with an auxiliary device, wherein the auxiliary device has a monitoring its functional state monitoring device which is connected to the control input of the transmitter. In the event of a change in the functional state of the auxiliary device, in particular in the event of a malfunction, the transmitter then generates the associated error message signal.
  • the monitoring device preferably contains a switch that can be actuated by a change in the functional state.
  • the switch may be a pressure, temperature, magnetic inductive or other switch, which responds to the exceeding or falling below a pressure, temperature, position or other limit.
  • the auxiliary device may be a pressure transmitter, wherein the monitoring device detects a loss of the transmission fluid in the pressure transmitter.
  • a transmitter 1, here a pressure or differential pressure transmitter has a sensor 2, with which a measured variable, Here pressure is converted into an electrical sensor signal 3.
  • the pressure is detected with the help of a pressure transmitter 4 at a measuring point in a technical system and transmitted by means of a transmission fluid in a capillary 5 to the sensor 2.
  • the sensor signal 3 is processed in a signal processing device 6 to a measurement signal 7 and then transferred via a data interface 8 to the communication system 9 of the technical system.
  • the signal processing device 6 is able to detect any hardware or software errors occurring in the transmitter, to display them via a display 10 on the transmitter and also to provide the error as diagnostic information 11 at the data interface 8.
  • the diaphragm seal 4 has a monitoring device 12 with a pressure switch 13, which responds to a loss of transmission fluid and then closes. Via a two-wire control line 14, the pressure switch 13 is connected to a separate control input 15 of the transmitter 1.
  • the control input 15 is connected with one terminal to the ground potential and the other terminal via a resistor 16 to the supply voltage potential V + of the transmitter 1, so that when closing the pressure switch 13, a current flows through the resistor 16.
  • a comparator 17 in the simplest case an AND gate, is controlled, which triggers the signal processing device 6 in the sense of generating the error message signal 11.
  • the pressure switch 13 can also operate as an opener, so that the current path in the control input 15 is not closed but opened for the error message.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Description

Die Erfindung betrifft einen Messumformer mit einem Sensor zur Umwandlung einer damit erfassten Messgrösse in ein elektrisches Sensorsignal, mit einer Signalverarbeitungseinrichtung, die zur Aufbereitung des Sensorsignals zu einem Messsignal und zur Erzeugung eines Fehlermeldesignals ausgebildet ist, und mit einer Datenschnittstelle zur Übertragung des Messsignals und Fehlermeldesignals.The invention relates to a measuring transducer with a sensor for converting a measured quantity detected thereby into an electrical sensor signal, with a signal processing device which is designed to process the sensor signal into a measuring signal and to generate an error message signal, and with a data interface for transmitting the measuring signal and error message signal.

Beispielsweise weist ein Druckmessumformer einen Drucksensor auf, dessen Sensorsignal in einer messumformereigenen Signalverarbeitungseinrichtung verstärkt, digitalisiert, ausgewertet und bezüglich Linearität und Temperaturverhalten korrigiert wird. Das so aufbereitete Messsignal wird über eine Datenschnittstelle, z. B. PROFIBUS oder HART, dem Kommunikationssystem einer technischen Anlage aufgegeben, in der der Messumformer installiert ist. Treten im Messumformer Hard - oder Softwarefehler auf, so wird dies an dem Messumformer angezeigt, wobei der Fehler zusätzlich als digitale Diagnoseinformation an der Datenschnittstelle zur Verfügung gestellt wird. Bei einer 4 ... 20 mA-Schnittstelle kann der Fehler gemäß der NAMUR-Empfehlung NE43 auch analog in Form eines Stromwertes außerhalb dieses vorgegebenen Signalpegelbereichs übertragen werden, z. B. als Downscale-Wert von < 3,6 mA oder als Upscale-Wert von > 21 mA. Die Patentschrift US-A-5 874 895 offenbart einen Messumformer mit einer Datenschnittstelle zur übertregung eines Messsignals und eines Fehlermeldesignals.For example, a pressure transducer has a pressure sensor whose sensor signal is amplified, digitized, evaluated and corrected in terms of linearity and temperature behavior in a signal converter's own signal processing device. The thus prepared measurement signal is transmitted via a data interface, eg. For example, PROFIBUS or HART, the communication system of a technical system in which the transmitter is installed. If hardware or software errors occur in the transmitter, this will be displayed on the transmitter, with the error also being provided as digital diagnostic information at the data interface. In the case of a 4 ... 20 mA interface, the error can also be transmitted analogously in the form of a current value outside of this predetermined signal level range, in accordance with NAMUR recommendation NE43, for example. B. as Downscale value of <3.6 mA or as Upscale value of> 21 mA. The patent US-A-5,874,895 discloses a transmitter with a data interface for the excitation of a measurement signal and an error message signal.

Der Erfindung liegt die Aufgabe zugrunde, auf einfache Weise auch außerhalb des Messumformers auftretende Fehlerereignisse melden zu können.The invention has for its object to be able to easily report occurring outside the transmitter error events.

Gemäß der Erfindung wird die Aufgabe dadurch gelöst, dass der Messumformer der eingangs genannten Art einen von der Datenschnittstelle verschiedenen Steuereingang aufweist, über den die Erzeugung des Fehlermeldesignals auslösbar ist. Für ein außerhalb des Messumformers detektiertes Fehlerereignis wird also der Steuereingang des Messumformers genutzt, um von diesem ein Fehlermeldesignal erzeugen und über die Datenschnittstelle übertragen zu lassen.According to the invention, the object is achieved in that the measuring transducer of the type mentioned has a different from the data interface control input, via which the generation of the error message signal can be triggered. For a The error signal detected outside the transmitter is thus used by the control input of the transmitter in order to generate an error message signal from it and transmit it via the data interface.

Vorzugsweise ist dabei die Erzeugung des Fehlermeldesignals durch Kurzschließen des Steuereingangs auslösbar, so kein Steuersignal erzeugt werden muss. Alternativ kann zur Erzeugung des Fehlermeldesignals auch ein Stromweg im Steuereingang unterbrochen werden.Preferably, the generation of the error message signal is triggered by short-circuiting the control input, so no control signal must be generated. Alternatively, a current path in the control input can be interrupted to generate the error message signal.

Der Messumformer ist bevorzugt mit einem Zusatzgerät betreibbar, wobei das Zusatzgerät eine seinen Funktionszustand überwachende Überwachungseinrichtung aufweist, welche an dem Steuereingang des Messumformers angeschlossen ist. Bei einer Änderung des Funktionszustands des Zusatzgeräts, insbesondere bei einem Funktionsausfall, erzeugt dann der Messumformer das zugehörige Fehlermeldesignal.The transmitter is preferably operable with an auxiliary device, wherein the auxiliary device has a monitoring its functional state monitoring device which is connected to the control input of the transmitter. In the event of a change in the functional state of the auxiliary device, in particular in the event of a malfunction, the transmitter then generates the associated error message signal.

Vorzugsweise enthält die Überwachungseinrichtung einen durch eine Änderung des Funktionszustandes betätigbaren Schalter. Bei dem Schalter kann es sich um einen Druck-, Temperatur-, magnetisch induktiven oder sonstigen Schalter handeln, der auf das Über- oder Unterschreiten eines Druck-, Temperatur-, Stellungs- oder sonstigen Grenzwertes anspricht.The monitoring device preferably contains a switch that can be actuated by a change in the functional state. The switch may be a pressure, temperature, magnetic inductive or other switch, which responds to the exceeding or falling below a pressure, temperature, position or other limit.

Insbesondere kann es sich bei dem Zusatzgerät um einen Druckmittler handeln, wobei die Überwachungseinrichtung einen Verlust der Übertragungsflüssigkeit in dem Druckmittler detektiert.In particular, the auxiliary device may be a pressure transmitter, wherein the monitoring device detects a loss of the transmission fluid in the pressure transmitter.

Zur weiteren Erläuterung der Erfindung wird im Folgenden auf die Figur der Zeichnung Bezug genommen, die ein Ausführungsbeispiel des erfindungsgemäßen Messumformers zeigt.To further explain the invention, reference is made below to the figure of the drawing, which shows an embodiment of the transmitter according to the invention.

Ein Messumformer 1, hier ein Druck- oder Differenzdruckmessumformer, weist einen Sensor 2, auf, mit dem eine Messgrösse, hier Druck, in ein elektrisches Sensorsignal 3 umgewandelt wird. Der Druck wird dazu mit Hilfe eines Druckmittlers 4 an einer Messstelle in einer technischen Anlage erfasst und mittels einer Übertragungsflüssigkeit in einer Kapillare 5 auf den Sensor 2 übertragen. Das Sensorsignal 3 wird in einer Signalverarbeitungseinrichtung 6 zu einem Messsignal 7 aufbereitet und anschließend über eine Datenschnittstelle 8 an das Kommunikationssystem 9 der technischen Anlage übergeben. Darüber hinaus ist die Signalverarbeitungseinrichtung 6 in der Lage, im Messumformer auftretende Hard- oder Softwarefehler zu erkennen, diese über ein Display 10 an dem Messumformer anzuzeigen und zusätzlich den Fehler als Diagnoseinformation 11 an der Datenschnittstelle 8 zur Verfügung zu stellen.A transmitter 1, here a pressure or differential pressure transmitter, has a sensor 2, with which a measured variable, Here pressure is converted into an electrical sensor signal 3. The pressure is detected with the help of a pressure transmitter 4 at a measuring point in a technical system and transmitted by means of a transmission fluid in a capillary 5 to the sensor 2. The sensor signal 3 is processed in a signal processing device 6 to a measurement signal 7 and then transferred via a data interface 8 to the communication system 9 of the technical system. In addition, the signal processing device 6 is able to detect any hardware or software errors occurring in the transmitter, to display them via a display 10 on the transmitter and also to provide the error as diagnostic information 11 at the data interface 8.

Der Druckmittler 4 weist eine Überwachungseinrichtung 12 mit einem Druckschalter 13 auf, der bei einem Verlust der Übertragungsflüssigkeit anspricht und dann schließt. Über eine zweidrahtige Steuerleitung 14 ist der Druckschalter 13 an einem separaten Steuereingang 15 des Messumformers 1 angeschlossen. Der Steuereingang 15 ist mit einem Anschluss an dem Massepotential und dem anderen Anschluss über einen Widerstand 16 an der Versorgungsspannungspotential V+ des Messumformers 1 angeschlossen, so dass beim Schließen des Druckschalters 13 ein Strom durch den Widerstand 16 fließt. Mit dem daraus resultierenden Spannungsabfall über dem Widerstand 16 wird ein Komparator 17, im einfachsten Fall ein UND-Gatter, angesteuert, welcher die Signalverarbeitungseinrichtung 6 im Sinne der Erzeugung des Fehlermeldesignals 11 antriggert. Alternativ kann der Druckschalter 13 auch als Öffner arbeiten, so dass für die Fehlermeldung der Stromweg im Steuereingang 15 nicht geschlossen sondern geöffnet wird.The diaphragm seal 4 has a monitoring device 12 with a pressure switch 13, which responds to a loss of transmission fluid and then closes. Via a two-wire control line 14, the pressure switch 13 is connected to a separate control input 15 of the transmitter 1. The control input 15 is connected with one terminal to the ground potential and the other terminal via a resistor 16 to the supply voltage potential V + of the transmitter 1, so that when closing the pressure switch 13, a current flows through the resistor 16. With the resulting voltage drop across the resistor 16, a comparator 17, in the simplest case an AND gate, is controlled, which triggers the signal processing device 6 in the sense of generating the error message signal 11. Alternatively, the pressure switch 13 can also operate as an opener, so that the current path in the control input 15 is not closed but opened for the error message.

Claims (6)

  1. Measuring transducer (1) having a sensor (2) for converting a measurement variable recorded therewith into an electrical sensor signal (3), having a signal processing device (6) which is designed to condition the sensor signal (3) to form a measurement signal (7) and to generate an error message signal (11), and having a data interface (8) for transmitting the measurement signal (7) and error message signal (11), characterized in that the measuring transducer (1) has a control input (15) which is different from the data interface (8) and can be used to trigger the generation of the error message signal (11).
  2. Measuring transducer according to Claim 1, characterized in that the generation of the error message signal (11) can be triggered by short-circuiting the control input (15).
  3. Measuring transducer according to Claim 1, characterized in that the generation of the error message signal (11) can be triggered by opening a current path in the control input (15).
  4. Measuring transducer according to one of the preceding claims, characterized in that it can be operated using an additional device (4), and in that the additional device (4) has a monitoring device (12) which monitors its functional state and is connected to the control input (15) of the measuring transducer (1).
  5. Measuring transducer according to Claim 4, characterized in that the monitoring device (12) contains a switch (13) which can be actuated by a change in the functional state.
  6. Measuring transducer according to Claim 4 or 5, characterized in that the additional device (4) is a pressure transmitter, and in that the monitoring device (12) detects a loss of the transmission fluid in the pressure transmitter (4).
EP02802603A 2001-11-02 2002-10-31 Measuring transducer Expired - Lifetime EP1440290B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10153997 2001-11-02
DE10153997 2001-11-02
PCT/DE2002/004072 WO2003040657A2 (en) 2001-11-02 2002-10-31 Measuring transducer

Publications (2)

Publication Number Publication Date
EP1440290A2 EP1440290A2 (en) 2004-07-28
EP1440290B1 true EP1440290B1 (en) 2013-01-30

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EP02802603A Expired - Lifetime EP1440290B1 (en) 2001-11-02 2002-10-31 Measuring transducer

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US (1) US7054765B2 (en)
EP (1) EP1440290B1 (en)
WO (1) WO2003040657A2 (en)

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Also Published As

Publication number Publication date
WO2003040657A2 (en) 2003-05-15
EP1440290A2 (en) 2004-07-28
WO2003040657A3 (en) 2003-08-07
US7054765B2 (en) 2006-05-30
US20050017736A1 (en) 2005-01-27

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