EP2027516A1 - Appareil de terrain et procede pour traiter au moins une grandeur mesuree dans un appareil de terrain - Google Patents

Appareil de terrain et procede pour traiter au moins une grandeur mesuree dans un appareil de terrain

Info

Publication number
EP2027516A1
EP2027516A1 EP07765421A EP07765421A EP2027516A1 EP 2027516 A1 EP2027516 A1 EP 2027516A1 EP 07765421 A EP07765421 A EP 07765421A EP 07765421 A EP07765421 A EP 07765421A EP 2027516 A1 EP2027516 A1 EP 2027516A1
Authority
EP
European Patent Office
Prior art keywords
filter
field device
predetermined
signal
automation
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Withdrawn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
EP07765421A
Other languages
German (de)
English (en)
Inventor
Andreas Kaszkin
Wolfgang Stiehl
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 EP2027516A1 publication Critical patent/EP2027516A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G05B19/4185—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by the network communication
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/31—From computer integrated manufacturing till monitoring
    • G05B2219/31121—Fielddevice, field controller, interface connected to fieldbus
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/41—Servomotor, servo controller till figures
    • G05B2219/41152—Adaptive filter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Definitions

  • the invention relates to a field device and method for processing at least one measured variable in a field device.
  • the field devices include u. a. Pressure, temperature, flow, level etc. transmitters, gas or liquid analysis analyzers, weighing systems, actuators, valve positioners, other distributed controllers and electric motor drives.
  • the field devices in the decentralized peripheral area possibly together with decentralized control and regulation and operation and observation, connected via field buses or other communication paths with different fieldbuses are connected to each other via bus coupler.
  • the field buses can turn via control devices such.
  • B. programmable programmable logic controllers be connected to a central system bus to which the control or engineering system, so the central control, regulation, operation and observation is connected.
  • Measured variables that are detected by the field devices, in particular transmitters, in the system are usually filtered in order to free them from further processing of non-interest frequency components and interference (Measured variable (eg pressure) and the electrical measurement signal derived from it are used synonymously here for the sake of simplicity).
  • the filter characteristic is usually set fixed so that it remains unchanged during the entire operation of the system.
  • the setting, for example, of the cut-off frequency of a low-pass filter or of the filter width of a mean value filter thus represents a compromise between the reaction speed to signal changes and the required measurement accuracy.
  • the use of adaptive signal filters is also known in which, depending on the signal curve of the filtered signal Filter characteristic is changed.
  • the invention is based on the object of enabling a quick and accurate measurement signal filtering with simple means.
  • the object is achieved by the field device specified in claim 1 or the method specified in claim 5.
  • the invention is thus a
  • Field devices via a communication system with a control system is connectable, - with a communication interface for connecting the
  • Field device with the communication system - with a control device for controlling the device-specific functions as well as the communication of data via the communication interface, - With means for detecting and processing at least one measured variable from the system, wherein the means include a signal filter with a variable filter characteristic, and
  • a filter adaptation device which can be controlled by the control device for adapting the filter characteristic to different predetermined filter characteristics as a function of event information from the operating procedure of the system obtained via the communication interface
  • Method for processing at least one measured variable in a field device of an automation system wherein the field device performs device-specific functions within the automation of the operation of a system and exchanges information with the automation system via a communication interface and wherein the measured variable detected by the field device from the system is filtered in a signal filter whose filter characteristic is variable and is adapted to different predetermined filter characteristics as a function of event information obtained via the communication interface from the operating sequence of the system.
  • the invention is based on the finding that an exact or rapid measurement can be improved by the fact that the dynamic adaptation of the signal filtering is event-controlled directly from the knowledge about the operation of the system.
  • Such an event can, for. Example, be a pressure increase in the system, wherein the pressure increase is initiated, for example, by a control signal for opening a valve in the system.
  • This control signal for the valve precedes the actual pressure increase and according to the invention is used to adapt the filter characteristic of the signal filtering, for example, in a pressure transducer to the following pressure increase with the resulting temporary pressure fluctuations.
  • the limit frequency of the signal filter is preferably increased in response to the received event information (in this case the aforementioned control signal for the valve), so that the signal filter can follow the dynamics of the measurement signal more quickly. This is advantageous if, for example, pressure peaks are to be detected.
  • the cut-off frequency follows a predetermined time function, for example exp -t / ⁇ or exp - (t / ⁇ ) 2 , where t is the time and ⁇ is a given, z. Eg configurable, time constant.
  • the filter width i. H. the number of trimming values of the measuring signal used for averaging is changed from a predetermined lower value to a predetermined higher value.
  • the filter characteristic even with respect to the filter type, z. B. Bessel or Butterworth filter and / or the filter order be changeable.
  • FIG. 1 shows a block diagram of an automation system
  • Figure 2 shows an example of the inventive Feldgerat
  • FIG. 3 shows an example of the filtering of a measured variable detected by the field device.
  • FIG. 1 shows, in a simplified schematic representation, an example of an automation system with field devices 1 to 5, which have predetermined measurement, control and control processes in a process to be controlled and / or a system in which such a process takes place Recognize control functions and exchange over a network 6 process, function and / or device relevant data with the process automation system.
  • the field devices 1 to 5 via a field bus 7, z. B. according to the PROFIBUS standard, as part of the network 6 to programmable controllers 8 and 9, z. B. programmable logic controllers (PLC), connected, which in turn are connected via a central system bus 10 with a higher-level control and regulation 11 and operation and observation 12.
  • PLC programmable logic controllers
  • At least some of the field devices 1 to 5 are transducers that record and process measured variables from the plant or the process. Other field devices, such. Positioners, for example, can acquire readings without the transmitters being transmitters.
  • FIG. 2 shows a simplified schematic representation of an example of the field device 1, which is a transmitter here.
  • This has a transducer 13, which in the process or the system a measured variable m, z. B. flow, detected and generates a corresponding measurement signal.
  • the measurement signal successively passes through a measurement signal amplifier 14, an analog / digital converter 15 and a signal filter 16 with variable filter characteristics, before it is evaluated in an evaluation device 17 to a measured value for the process control.
  • the field device 1 is connected via a communication interface 18 to the field bus 7, so that the measured value to other components of the Automation system can be transmitted.
  • the evaluation of the measurement signal and the communication via the communication interface 18 are controlled by a control device 19.
  • the control device 19 also controls a filter adaptation device 20 in order to adapt the filter characteristic to different predetermined filter characteristics as a function of event information obtained from the operating procedure of the system via the communication interface 18.
  • Figure 3 shows an example of the course of the measured variable m, here z. B. a pressure in a fluid line of the system. At a time to an exhaust valve in the line is opened by a corresponding control signal, so that the pressure drops suddenly. Due to the elasticity of the line system and the components present therein, oscillations occur in the measurement signal m, the initially high oscillation amplitude decreasing with time. Further interference signals, such as vibrations coming from the outside, are superimposed on the measurement signal m. In order to obtain as fast as possible the exact mean pressure value which corresponds to the mean value of the measuring signal, the control signal for the outlet valve is transmitted to the field device 1 as an event message. Then, the cutoff frequency f 0 of here z. B.
  • ⁇ (t) f 02 [1+ ((foi-f02) / f02) exp- (t / ⁇ ) 2 ] is changed to a predetermined lower value fo2. This ensures that the output signal m 'of the signal filter 16 can initially follow the oscillations of the measurement signal m in order then to be brought very quickly to the mean value of the measurement signal m.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Testing And Monitoring For Control Systems (AREA)
  • Feedback Control In General (AREA)

Abstract

L'invention concerne un appareil de terrain qui fait partie d'un système d'automatisation et exerce à ce titre des fonctions spécifiques à l'appareil lors de l'automatisation du fonctionnement opérationnel d'un équipement. L'appareil de terrain présente des moyens pour détecter et traiter au moins une grandeur mesurée sur l'équipement ainsi qu'une interface de communication pour communiquer avec le système d'automatisation. Pour permettre un filtrage le plus rapide et le plus précis possible du signal de mesure avec des moyens simples, la grandeur (m) mesurée acquise par l'appareil (1) de terrain sur l'équipement est filtrée avec un filtre (16) à signal dont la caractéristique de filtrage est modifiable et qui est adaptée à différentes caractéristiques de filtrage prédéfinies en fonction des informations de résultat sur le fonctionnement opérationnel de l'équipement obtenues par le biais de l'interface (18) de communication.
EP07765421A 2006-06-14 2007-06-14 Appareil de terrain et procede pour traiter au moins une grandeur mesuree dans un appareil de terrain Withdrawn EP2027516A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006028006A DE102006028006A1 (de) 2006-06-14 2006-06-14 Feldgerät und Verfahren zum Verarbeiten mindestens einer Messgröße in einem Feldgerät
PCT/EP2007/055900 WO2007144406A1 (fr) 2006-06-14 2007-06-14 Appareil de terrain et procédé pour traiter au moins une grandeur mesurée dans un appareil de terrain

Publications (1)

Publication Number Publication Date
EP2027516A1 true EP2027516A1 (fr) 2009-02-25

Family

ID=38468852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07765421A Withdrawn EP2027516A1 (fr) 2006-06-14 2007-06-14 Appareil de terrain et procede pour traiter au moins une grandeur mesuree dans un appareil de terrain

Country Status (4)

Country Link
US (1) US20100318229A1 (fr)
EP (1) EP2027516A1 (fr)
DE (1) DE102006028006A1 (fr)
WO (1) WO2007144406A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9483039B2 (en) 2012-04-19 2016-11-01 Rosemount Inc. Wireless field device having discrete input/output

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US3678416A (en) * 1971-07-26 1972-07-18 Richard S Burwen Dynamic noise filter having means for varying cutoff point
US3889108A (en) * 1974-07-25 1975-06-10 Us Navy Adaptive low pass filter
US4132950A (en) * 1977-04-27 1979-01-02 Texas Instruments Incorporated Clarifying radio receiver
JP2911748B2 (ja) * 1994-05-31 1999-06-23 株式会社日立製作所 フィールドバスシステムにおける通信装置
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
US5942696A (en) * 1997-03-27 1999-08-24 Rosemount Inc. Rapid transfer function determination for a tracking filter
FI111106B (fi) * 1999-02-19 2003-05-30 Neles Controls Oy Menetelmä prosessinsäätösilmukan virittämiseksi teollisuusprosessissa
US6894580B2 (en) * 2000-10-05 2005-05-17 Globespanvirata, Inc Filter tuner system and method
JP5091374B2 (ja) * 2001-05-15 2012-12-05 日本テキサス・インスツルメンツ株式会社 フィルタ回路
DE10161072A1 (de) * 2001-12-12 2003-06-18 Endress & Hauser Gmbh & Co Kg Feldgeräteelektronik mit einer Sensoreinheit für die Prozessmesstechnik
DE10161069A1 (de) * 2001-12-12 2003-06-18 Endress & Hauser Gmbh & Co Kg Feldgeräteelektronik mit einer Sensoreinheit für kapazitive Füllstandsmessungen in einem Behälter
FR2835667B1 (fr) * 2002-02-07 2006-08-04 St Microelectronics Sa Procede de reglage de la frequence de coupure d'un systeme electronique de filtrage, et systeme correspondant
US6901300B2 (en) * 2002-02-07 2005-05-31 Fisher-Rosemount Systems, Inc.. Adaptation of advanced process control blocks in response to variable process delay
US6888422B2 (en) * 2002-12-27 2005-05-03 Harris Corporation Continuously variable filter
US7266464B2 (en) * 2004-12-17 2007-09-04 Texaco Inc. Dynamic cut-off frequency varying filter

Non-Patent Citations (1)

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Title
See references of WO2007144406A1 *

Also Published As

Publication number Publication date
DE102006028006A1 (de) 2007-12-20
US20100318229A1 (en) 2010-12-16
WO2007144406A1 (fr) 2007-12-21

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