EP0809222A1 - Appareil de transfert de données dans des systèmes de commande de processus - Google Patents

Appareil de transfert de données dans des systèmes de commande de processus Download PDF

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Publication number
EP0809222A1
EP0809222A1 EP97250159A EP97250159A EP0809222A1 EP 0809222 A1 EP0809222 A1 EP 0809222A1 EP 97250159 A EP97250159 A EP 97250159A EP 97250159 A EP97250159 A EP 97250159A EP 0809222 A1 EP0809222 A1 EP 0809222A1
Authority
EP
European Patent Office
Prior art keywords
field
transformer
data bus
field device
coupling means
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Withdrawn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
EP97250159A
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German (de)
English (en)
Inventor
Günter Dipl.-Ing. von zur Gathen
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.)
ABB Training Center GmbH and Co KG
Original Assignee
Hartmann and Braun 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 Hartmann and Braun AG filed Critical Hartmann and Braun AG
Publication of EP0809222A1 publication Critical patent/EP0809222A1/fr
Withdrawn legal-status Critical Current

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    • 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 an arrangement for data transmission in process control systems, such as are used in process engineering.
  • each measured value or manipulated value is converted into a proportional direct current, which is superimposed on the direct feed current, wherein the direct current presenting the measured value or manipulated value can be a multiple of the direct feed current.
  • the supply current requirement of the field device is usually set to approx. 4 mA and the dynamic range of the measured value or control value is mapped to currents between 0 and 16 mA, so that the known 4 ... 20 mA current loop can be used.
  • the circuits for the measured value acquisition and the measured value processing are predominantly galvanically separated from one another.
  • Newer field devices are also characterized by universal properties that are largely adaptable to the respective process.
  • a bidirectionally operable alternating current transmission path is provided, via which parameterization data are transmitted in the direction of the field device and measured values and status data are transmitted from the direction of the field device.
  • the parameterization data and the measured values as well as the status data are modulated onto an AC voltage, preferably frequency-modulated.
  • field devices In process control engineering, it is customary to arrange and link field devices in the so-called field area, i.e. measuring, actuating and display modules, in accordance with the specified safety conditions on site. These field devices have analog and digital interfaces with each other for data transmission. The data transmission is carried out via the feed lines of the power supply arranged in the waiting area. For remote control and remote diagnosis of these field devices, control devices are also provided in the so-called waiting area, the security requirements of which are generally subject to lower requirements.
  • the data transmission between the operating devices in the control room and the field devices is realized by superimposing the known 20 mA current loops with the help of FSK modulation (frequency shift keying). Two frequencies, which are assigned to the binary states "0" and "1", are transmitted analogously in frames.
  • the first network topology concerns a point-to-point connection. Only one field device can be connected to each operating device. The field device allows both analog and digital transmission.
  • the second network topology relates to a bus structure in which a plurality of field devices can be connected to an operating device via a common bus. Only digital data transmission is permitted. Due to the definition of parameters, the maximum number of field devices that can be connected to a bus is limited to 15 and the maximum length of the bus to approximately 3300 m.
  • a key component of these definition parameters is the internal resistance of the power supply devices assigned to the field devices.
  • the internal resistance of the voltage source is connected in parallel with the input resistance of the respective receiver circuit, so that the resulting terminating resistance from the transmission direction is also almost zero. Communication is therefore only possible if a sufficiently large impedance for modulation is provided.
  • the invention is based on the object, while maintaining the direct current transmission path between a control device and a field device, to network a large number of field devices with the least possible effort for bidirectional AC communication with an operating device via a serial data bus.
  • FIG. 1 shows a block diagram of an arrangement for data exchange in a process control system.
  • the invention is based on a field device 10 which is connected to a control device 30 via a coupling means 20.
  • the coupling means 20 is designed for the electrical isolation of the circuit from the control device 30 from the circuit of the field device 10.
  • the 4 ... 20 mA current loop known per se is used for direct current transmission from control device 30 to field device 10.
  • the communication between the control device 30 and the field device 10 is unidirectional in relation to the direct current transmission.
  • the 4... 20 mA current loop represents the recorded measured value, which is transmitted to the control device 30.
  • the 4 ... 20 mA current loop is fed by the control device 30 and represents the control value to be set on the field device 10.
  • the coupling means 20 has a chain connection comprising an inverter, a transformer and a rectifier, the inverter being connected to the driven current loop and the rectifier being connected to the driving current loop.
  • Coupling means 20 of this type are known per se and are described in detail, for example, in DE 43 43 450.
  • the operating device 50 can be designed as a personal computer 51 known per se with a connected modem 52.
  • the coupling means 20 has a separate alternating current transformer 21, the windings of which are traversed by the driving and driven current of the coming and going 4 ... 20 mA current loops. It is provided that the current strengths of the driving and driven direct currents are exactly identical in terms of magnitude and directed in opposite directions with respect to the through-flow of the alternating current transformer 21, so that the alternating current transformer 21 is compensated for direct current. In addition, it is provided to build the AC transformer 21 with a core made of highly permeable material.
  • the saturation of the core is avoided even in the smallest designs of the AC transformer 21, despite the highly permeable core material, but the AC impedance of the transformer 21, which represents the input resistance for the bidirectional AC signal, is increased to such an extent that an AC parallel connection of several coupling means 20 is observed the level and impedance limit values for the FSK signal used for AC transmission according to the HART protocol are made possible without amplifier means.
  • the data bus 70 is connected to each coupling means 20 on the control unit side via an attenuator 40 which has at least one capacitive switching element. It is provided that the AC circuit of the data bus 70 via the series connection from the internal resistance of the respective DC receiver 20th or 30 and the control unit-side winding of the transformer 21 is closed.
  • the control device 30 is the receiver of the unidirectional direct current and the input resistance of the control device 30 is connected in series with the control device-side winding of the transformer 21 with respect to the AC circuit of the data bus 70.
  • the coupling means 20 is the receiver of the unidirectional direct current fed in by the control device 30 and the input resistance of the coupling means 20 is connected in series with the control unit-side winding of the transmitter 21 with respect to the AC circuit of the data bus 70.
  • the number of coupling means 20 that can be connected to a data bus 70 via an attenuator 40 depends on the design of the AC transformer 21, taking into account the total impedance resulting from the parallel connection of the individual AC impedances with respect to the impedance limit specified by the HART protocol.
  • the data bus 70 is connected to the modem 52 of the operating device 50.
  • each attenuator 40 according to FIG. 3 consists of a chain circuit in a line consisting of a resistor and a capacitor.
  • the data bus 70 is segmented by active bus couplers 60.
  • the modem 52 of the operating device 50 is connected to a plurality of such bus couplers 60, each of which is followed by a maximum, predeterminable number of attenuators 40 for connection to coupling means 20.
  • Such a bus coupler 60 is described in detail in DE 42 32 922.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
EP97250159A 1996-05-22 1997-05-22 Appareil de transfert de données dans des systèmes de commande de processus Withdrawn EP0809222A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996122295 DE19622295A1 (de) 1996-05-22 1996-05-22 Anordnung zur Datenübertragung in Prozeßleitsystemen
DE19622295 1996-05-22

Publications (1)

Publication Number Publication Date
EP0809222A1 true EP0809222A1 (fr) 1997-11-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97250159A Withdrawn EP0809222A1 (fr) 1996-05-22 1997-05-22 Appareil de transfert de données dans des systèmes de commande de processus

Country Status (2)

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EP (1) EP0809222A1 (fr)
DE (1) DE19622295A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008052877A1 (fr) 2006-10-31 2008-05-08 Endress+Hauser Gmbh + Co. Kg Dispositif pour la détermination et/ou la surveillance d'au moins une grandeur de processus
WO2008061935A1 (fr) * 2006-11-22 2008-05-29 Endress+Hauser Wetzer Gmbh+Co. Kg Unité de séparation de signaux pour boucle de régulation de processus à deux conducteurs
CN103471637A (zh) * 2004-03-29 2013-12-25 罗斯蒙德公司 具有隔离can输出的两线变送器
EP2701018A1 (fr) * 2012-08-21 2014-02-26 Krohne Messtechnik GmbH Procédé de paramétrage sécurisé d'un appareil de terrain

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10258075B4 (de) * 2002-12-11 2012-11-29 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Signalübertragung zwischen einem Feldgerät und einer externen Einheit
US8145180B2 (en) 2004-05-21 2012-03-27 Rosemount Inc. Power generation for process devices
US8160535B2 (en) 2004-06-28 2012-04-17 Rosemount Inc. RF adapter for field device
US7262693B2 (en) 2004-06-28 2007-08-28 Rosemount Inc. Process field device with radio frequency communication
DE102005001601B4 (de) * 2005-01-12 2011-07-28 Endress + Hauser GmbH + Co. KG, 79689 Feldgerät mit Busschnittstelle
JP4652444B2 (ja) 2005-03-12 2011-03-16 ルートロン エレクトロニクス カンパニー インコーポレイテッド 照明制御系用ハンドヘルドプログラマ
JP4676000B2 (ja) 2005-06-27 2011-04-27 ローズマウント インコーポレイテッド 動的に調節可能な電力消費量無線周波数通信を備えたフィールド装置
US8000841B2 (en) 2005-12-30 2011-08-16 Rosemount Inc. Power management in a process transmitter
US8049361B2 (en) 2008-06-17 2011-11-01 Rosemount Inc. RF adapter for field device with loop current bypass
US8694060B2 (en) 2008-06-17 2014-04-08 Rosemount Inc. Form factor and electromagnetic interference protection for process device wireless adapters
CA2726601C (fr) 2008-06-17 2016-08-09 Rosemount Inc. Adaptateur rf pour dispositif de terrain a chute de tension variable
US8929948B2 (en) 2008-06-17 2015-01-06 Rosemount Inc. Wireless communication adapter for field devices
CA2726707C (fr) 2008-06-17 2016-01-19 Rosemount Inc. Adaptateur rf pour dispositif de terrain a serrage de securite intrinseque a faible tension
US9674976B2 (en) 2009-06-16 2017-06-06 Rosemount Inc. Wireless process communication adapter with improved encapsulation
US8626087B2 (en) 2009-06-16 2014-01-07 Rosemount Inc. Wire harness for field devices used in a hazardous locations
US10761524B2 (en) 2010-08-12 2020-09-01 Rosemount Inc. Wireless adapter with process diagnostics
US9310794B2 (en) 2011-10-27 2016-04-12 Rosemount Inc. Power supply for industrial process field device

Citations (3)

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Publication number Priority date Publication date Assignee Title
WO1993004452A1 (fr) * 1991-08-14 1993-03-04 Rosemount Inc. Ensemble d'interface hydrostatique servant a detecter des signaux de communication numeriques
DE4232922A1 (de) * 1992-09-28 1994-03-31 Mannesmann Ag Anordnung zur Datenübertragung in Prozeßsystemen
DE4343540A1 (de) * 1993-12-14 1995-07-27 Mannesmann Ag Anordnung zur potentialgetrennten Übertragung von Gleich- und Wechselstromsignalen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993004452A1 (fr) * 1991-08-14 1993-03-04 Rosemount Inc. Ensemble d'interface hydrostatique servant a detecter des signaux de communication numeriques
DE4232922A1 (de) * 1992-09-28 1994-03-31 Mannesmann Ag Anordnung zur Datenübertragung in Prozeßsystemen
DE4343540A1 (de) * 1993-12-14 1995-07-27 Mannesmann Ag Anordnung zur potentialgetrennten Übertragung von Gleich- und Wechselstromsignalen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ORRISON IV G A: "TAKING FULL ADVANTAGE OF SMART TRANSMITTER TECHNOLOGY NOW", CONTROL ENGINEERING INTERNATIONAL, vol. 42, no. 1, 1 January 1995 (1995-01-01), pages 59 - 61, XP000500027 *
SCHOLZ W ET AL: "INTERKAMA '92: INTELLIGENTE MESSUMFORMER FUER DIE PROZESSMESSTECHNIK INTERKAMA '92: INTELLIGENT TRANSMITTERS FOR PROCESS MEASUREMENT", TECHNISCHES MESSEN TM 1982 - 1988 INCOMPLETE, vol. 60, no. 4, 1 April 1993 (1993-04-01), MÜNCHEN,DE, pages 157 - 161, XP000359605 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103471637A (zh) * 2004-03-29 2013-12-25 罗斯蒙德公司 具有隔离can输出的两线变送器
CN103471637B (zh) * 2004-03-29 2016-08-10 罗斯蒙特公司 具有隔离can输出的两线变送器
WO2008052877A1 (fr) 2006-10-31 2008-05-08 Endress+Hauser Gmbh + Co. Kg Dispositif pour la détermination et/ou la surveillance d'au moins une grandeur de processus
CN101535770B (zh) * 2006-10-31 2012-08-29 恩德莱斯和豪瑟尔两合公司 用于确定和/或监控至少一个过程变量的装置
US8354941B2 (en) 2006-10-31 2013-01-15 Endress + Hasuer Gmbh + Co. Kg Apparatus for determining and/or monitoring at least one process variable
WO2008061935A1 (fr) * 2006-11-22 2008-05-29 Endress+Hauser Wetzer Gmbh+Co. Kg Unité de séparation de signaux pour boucle de régulation de processus à deux conducteurs
EP2701018A1 (fr) * 2012-08-21 2014-02-26 Krohne Messtechnik GmbH Procédé de paramétrage sécurisé d'un appareil de terrain
CN103631175A (zh) * 2012-08-21 2014-03-12 克洛纳测量技术有限公司 用于参数化现场设备的方法和对应现场设备和系统

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Publication number Publication date
DE19622295A1 (de) 1997-11-27

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