EP1866887B1 - Alimentation de transducteur de mesure pour l'automatisation des processus - Google Patents

Alimentation de transducteur de mesure pour l'automatisation des processus Download PDF

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Publication number
EP1866887B1
EP1866887B1 EP06725336.9A EP06725336A EP1866887B1 EP 1866887 B1 EP1866887 B1 EP 1866887B1 EP 06725336 A EP06725336 A EP 06725336A EP 1866887 B1 EP1866887 B1 EP 1866887B1
Authority
EP
European Patent Office
Prior art keywords
transmitter
power supply
supply unit
unit
signal
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.)
Not-in-force
Application number
EP06725336.9A
Other languages
German (de)
English (en)
Other versions
EP1866887A2 (fr
Inventor
Michael Korn
Alfred Umkehrer
Thomas Joegel
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
Priority claimed from DE102005027047A external-priority patent/DE102005027047A1/de
Application filed by Endress and Hauser Wetzer GmbH and Co KG filed Critical Endress and Hauser Wetzer GmbH and Co KG
Publication of EP1866887A2 publication Critical patent/EP1866887A2/fr
Application granted granted Critical
Publication of EP1866887B1 publication Critical patent/EP1866887B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 transmitter power supply for process automation technology
  • field devices are often used to detect and / or influence 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 variables level, flow, pressure, temperature, pH or conductivity value as sensors.
  • actuators z.
  • 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 field devices and higher-level units is often based on the known 4-20 mA standard.
  • 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. From the US 5,469,746 a measuring system for process automation technology is known.
  • the power supply of the field devices via the 4-20 mA current signal, so that in addition to the signal line no additional supply line is necessary.
  • this current signal is generated not in the higher-level unit but in a separate transmitter supply unit connected to the signal line (2-wire line).
  • Intelligent field devices partly have extensive diagnostic functionalities, which, for. B. evaluate the loads of sensors or actuators, maintenance times determine and warn the user of the danger of an early failure of the field device.
  • Such additional information about the current state of a sensor can not be transmitted with the conventional 4-20 mA technology, which only allows the transmission of a measured value or a control signal for a valve.
  • This information can therefore only be displayed directly on the field device in plants based on the 4-20 mA technology.
  • a signaling of additional information on the control system would only be guaranteed if a regular transmission of this additional information to the control system would take place.
  • Communication between field devices and control systems is based on the HART standard according to the master slave principle, whereby field devices always act as slaves. By itself, a field device can thus not transmit additional information to the control system.
  • the object of the invention is in field devices which are connected via signal line to a control system, additional information provided by field devices to represent reliably and safely in a separate unit from the field device without changes to the control system must be made.
  • Transmitter supply for the process automation technology that is used to power a transmitter and for forwarding current signals that are transmitted between the transmitter and a parent unit via a signal line, characterized in that the transmitter supply SG connected via a modem to the signal line L microcontroller ⁇ C and a signaling device SE controlled by the microcontroller .mu.C, the signaling device SE serving to signal additional information supplied by the transmitter MU and transmitted to the microcontroller .mu.C via the signal line L.
  • the essential idea of the invention is, in a transmitter power supply, a modem and a microcontroller provided with a signaling device connected to provide. This allows the transmitter power supply and the transmitter to communicate with each other. Additional information is transmitted from the transmitter to the transmitter power supply and signaled by the signaling device.
  • a separation unit is provided in the measuring sum generator, which serves for the galvanic separation of the current signals transmitted between the measuring transducer and the control system.
  • the signaling device is designed as a switching contact and / or as a display element.
  • a transmitter power supply SG a transmitter MU and a control system LS, which serves as a parent unit, shown schematically.
  • the transmitter MU may, for. B. to the temperature sensor TMT 162 Fa. Endress + Hauser act.
  • Transmitter MU, transmitter supply SG and control system LS are connected to each other via a signal line L.
  • this signal line L which in principle consists of two line sections L1 and L2, a current signal representing a measured value is forwarded by the transmitter MU via the transmitter supply SG to the control system LS. Both line sections thus each represent a 4-20 mA current loop.
  • the transmitter power supply SG has a barrier EX in the signal path from the transmitter MU to the control system LS in accordance with the regulations on potentially explosive atmospheres, a separation unit TTE for galvanic isolation and a current source SQ.
  • a HART modem M and a downstream microcontroller ⁇ C are additionally provided in the transmitter supply SG.
  • the microcontroller ⁇ C is connected to a signaling device SE, which consists of an optical display element AE (eg LED diode) and a switching contact SK.
  • a power supply NT To power the individual components of the transmitter power supply SG is a power supply NT.
  • the power supply NT is also used to generate the Current signal that supplies power to the transmitter MU.
  • the transmitter MU acquires a reading that is converted into a 4-20 mA current signal. This current signal is transmitted via the line section L1 to the transmitter supply SG and on via the line section L2 to the control system LS.
  • control system LS z. B the measured value or generates a control signal for an actuator. If a limit value is exceeded, an alarm signal can also be generated.
  • the transmitter MU In addition to the measured value, the transmitter MU also provides additional additional information essentially diagnostic information.
  • the communication between the transmitter power supply SG and the transmitter MU takes place according to the HART standard.
  • the Transmitter Supply Unit SG which acts as the Master, must periodically poll the MU Transmitter, which serves as the Slave.
  • the assignment between these individual different additional information and a corresponding signaling can, for. This can be set, for example, via a switch (eg DIP switch), not shown, on the transmitter power supply SG or via appropriate parameters during the parameterization of the transmitter SG.
  • a switch eg DIP switch
  • the additional information is evaluated in the microcontroller .mu.C in accordance with the settings made and can then be signaled acoustically by the signaling device SE via the switching contact SK connected siren or via the display element AE with an LED diode.
  • the transmitter supply unit SG according to the invention can be easily used in existing process plants for signaling additional information from field devices. Changes to the control systems are not necessary. Due to its design, the MU transmitter power supply is also suitable for intrinsically safe applications. From the transmitter MU there is a continuous monitoring of the state of a field device connected to this.

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

Claims (8)

  1. Unité d'alimentation de transmetteur pour la technique d'automatisation des process, qui sert à l'alimentation en énergie d'un transmetteur et à la transmission de signaux de courant, qui sont transmis entre le transmetteur et une unité maître par l'intermédiaire d'une ligne de signal, caractérisée en ce
    qu'est prévu un bloc d'alimentation (NT) servant à la génération d'un signal de courant, qui alimente en énergie le transmetteur (MU), le signal de courant représentant une valeur mesurée et étant transmis par le transmetteur (MU) via l'unité d'alimentation de transmetteur (SG) vers le système numérique de contrôle commande (LS),
    en ce que l'unité d'alimentation de transmetteur (SG) comporte un microcontrôleur (µC) raccordé via un modem à la ligne de signal (L) et un dispositif de signalisation (SE) commandé par le microcontrôleur (µC), le dispositif de signalisation (SE) servant à la signalisation d'informations supplémentaires, qui sont fournies par le transmetteur (MU) et sont transmises au microcontrôleur (µC) par l'intermédiaire de la ligne de signal (L).
  2. Unité d'alimentation de transmetteur selon la revendication 1, caractérisée en ce que le bloc d'alimentation (NT) sert à l'alimentation en énergie de composants individuels de l'unité d'alimentation de transmetteur (SG).
  3. Unité d'alimentation de transmetteur selon la revendication 1 ou 2, caractérisée en ce que le signal de courant, qui représente la valeur mesurée, est transmis par l'intermédiaire de la ligne de signal (L), qui se compose de deux sections de ligne (L1) et (L2), du transmetteur (MU) via l'unité d'alimentation de transmetteur (SG) vers le système numérique de contrôle commande (LS), les deux sections de ligne (L1, L2) représentant chacune une boucle de courant 4-20 mA.
  4. Unité d'alimentation de transmetteur selon la revendication 1, 2 ou 3, caractérisée en ce que les informations supplémentaires sont transmises sous forme numérique, en tant que signal HART, par l'intermédiaire de la ligne de signal, l'unité d'alimentation de transmetteur, qui agit en tant qu'unité maître, interrogeant à intervalles réguliers le transmetteur (MU), qui sert d'esclave, afin d'obtenir les informations supplémentaires.
  5. Unité d'alimentation de transmetteur selon la revendication 1, 2, 3 ou 4, caractérisée en ce que l'unité d'alimentation de transmetteur (SG) comporte, dans le chemin de signal du transmetteur (MU) vers le système numérique de contrôle commande (LS), une barrière EX conforme aux prescriptions relatives aux zones explosibles, une unité de séparation (TE) destinée à la séparation galvanique et une source de courant (SQ).
  6. Unité d'alimentation de transmetteur selon la revendication 1, caractérisée en ce qu'est prévue dans l'unité d'alimentation (SG) une unité de séparation (TE), laquelle sert à la séparation galvanique des signaux de courant transmis par l'intermédiaire de la ligne de signal (L).
  7. Unité d'alimentation de transmetteur selon l'une des revendications précédentes, caractérisée en ce que le dispositif de signalisation (SE) comprend un contact de commutation (SK) et/ou un élément d'affichage (AE).
  8. Système de mesure comprenant une unité d'alimentation de transmetteur selon l'une des revendications précédentes, un transmetteur ainsi qu'un système numérique de contrôle commande.
EP06725336.9A 2005-04-07 2006-03-28 Alimentation de transducteur de mesure pour l'automatisation des processus Not-in-force EP1866887B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005016141 2005-04-07
DE102005027047A DE102005027047A1 (de) 2005-06-10 2005-06-10 Messumformerspeisegerät für die Prozessautomatisierungstechnik
PCT/EP2006/061071 WO2006106055A2 (fr) 2005-04-07 2006-03-28 Alimentation de transducteur de mesure pour l'automatisation des processus

Publications (2)

Publication Number Publication Date
EP1866887A2 EP1866887A2 (fr) 2007-12-19
EP1866887B1 true EP1866887B1 (fr) 2015-01-28

Family

ID=37025107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06725336.9A Not-in-force EP1866887B1 (fr) 2005-04-07 2006-03-28 Alimentation de transducteur de mesure pour l'automatisation des processus

Country Status (3)

Country Link
US (1) US20090216496A1 (fr)
EP (1) EP1866887B1 (fr)
WO (1) WO2006106055A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006055396A1 (de) * 2006-11-22 2008-05-29 Endress + Hauser Gmbh + Co. Kg Signaltrenneinheit für eine Zwei-Leiter-Prozessregelschleife
DE102016122714A1 (de) * 2016-11-24 2018-05-24 Endress + Hauser Wetzer Gmbh + Co Kg Kommunikations-Adapter für einen Transmitter eines Feldgeräts

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5469746A (en) * 1993-03-30 1995-11-28 Hitachi, Ltd. Electromagnetic flow meter
FR2727230B1 (fr) * 1994-11-18 1996-12-20 Commissariat Energie Atomique Dispositif d'adaptation de capteurs ou d'actionneurs de type "hart" avec un reseau local industriel de type "fip" et procede de mise en oeuvre de ce dispositif
US6611775B1 (en) * 1998-12-10 2003-08-26 Rosemount Inc. Electrode leakage diagnostics in a magnetic flow meter
US6765968B1 (en) * 1999-09-28 2004-07-20 Rosemount Inc. Process transmitter with local databus
US7773715B2 (en) * 2002-09-06 2010-08-10 Rosemount Inc. Two wire transmitter with isolated can output

Also Published As

Publication number Publication date
WO2006106055A3 (fr) 2007-01-18
US20090216496A1 (en) 2009-08-27
WO2006106055A2 (fr) 2006-10-12
EP1866887A2 (fr) 2007-12-19

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