WO2004077183A1 - Procede et dispositif de stabilisation en tension pour un bus de terrain a deux fils - Google Patents

Procede et dispositif de stabilisation en tension pour un bus de terrain a deux fils Download PDF

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Publication number
WO2004077183A1
WO2004077183A1 PCT/EP2004/001984 EP2004001984W WO2004077183A1 WO 2004077183 A1 WO2004077183 A1 WO 2004077183A1 EP 2004001984 W EP2004001984 W EP 2004001984W WO 2004077183 A1 WO2004077183 A1 WO 2004077183A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
fieldbus
wire
bus
field bus
Prior art date
Application number
PCT/EP2004/001984
Other languages
German (de)
English (en)
Inventor
Udo Grittke
Martin PFÄNDLER
Original Assignee
Endress+Hauser Gmbh+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
Application filed by Endress+Hauser Gmbh+Co. Kg filed Critical Endress+Hauser Gmbh+Co. Kg
Publication of WO2004077183A1 publication Critical patent/WO2004077183A1/fr

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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
    • 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 device and a method for voltage stabilization for a two-wire fieldbus according to the preamble of claim 1 and claim 7.
  • field devices are often used to record and / or influence process variables. Examples of such field devices are level measuring devices,
  • Mass flow devices pressure measuring devices, temperature measuring devices etc., which record the corresponding process variables level, mass flow, pressure and temperature as sensors. So-called actuators are used to influence process variables.
  • These field devices are generally connected to a control / evaluation unit via a communication link.
  • a communication link One possibility for this is a point-to-point connection in which each field device is connected separately via a
  • Connection line is connected to the corresponding control unit.
  • a further possibility is provided via a fieldbus, in which each field device is connected to the fieldbus via which the connection to the control unit is made.
  • a major advantage of fieldbuses is that the wiring effort is significantly reduced.
  • HART® A frequently used point-to-point connection between field devices and a control unit is given by the HART® standard.
  • HART® In addition to analog signal transmission (4 - 20 mA), HART® also allows the transmission of digital signals.
  • the operating current of the field devices is variable in this case. It fluctuates between 4 and 20 mA depending on the signal to be transmitted.
  • HART® can also be used as a fieldbus (HART® Multidrop).
  • HART® Multidrop HART® Multidrop
  • this use is not very widespread in process automation technology, but in the area of inventory control it offers a very inexpensive solution.
  • analog communication via a 4-20 mA signal is no longer possible.
  • the communication between the field device and the evaluation unit takes place exclusively digitally with the help of an alternating current signal according to the FSK method.
  • the operating current of the field devices connected to the HART® fieldbus when used as a HART® multidrop is typically set to the value 4 mA.
  • a voltage supply unit which is followed by a communication resistor, is usually used to supply voltage to the field devices connected to the HART® fieldbus.
  • This communication resistor prevents a short circuit of the digital communication signals via the voltage supply unit.
  • the object of the present invention is therefore to provide a device and a method for voltage stabilization for a two-wire fieldbus, in which a drop in the bus voltage below the permissible minimum operating voltage of the individual field devices is prevented.
  • the essential idea of the invention is to use a resistance element which can be bridged for a short time to stabilize the voltage of the two-wire fieldbus and which is triggered when the voltage supply to the fieldbus is switched on.
  • Bridging can also prevent the bus voltage from dropping below the minimum operating voltage of the connected field devices when the individual field devices connected to the fieldbus require more power during the "booting process".
  • the bridgeable resistance element it can e.g. B. is a controllable transistor that is switched briefly in the forward direction.
  • the bridgeable resistance element consists of a communication resistor and a relay contact connected in parallel to this.
  • the device additionally has a button which also enables manual triggering.
  • the two-wire fieldbus has a global communication connection unit.
  • This communication link unit enables worldwide information transfer between the field devices and a control unit (e.g. Fieldgate®, Endress + Hauser®).
  • the essential idea of the method according to the invention is to switch an additional current path when the power supply of the field bus is switched on, which prevents a voltage drop of the bus voltage below the permissible operating voltage of the field devices.
  • FIG. 1 two-wire fieldbus in a schematic representation
  • FIG. 2 two-wire field bus with the device for voltage stabilization according to the invention.
  • the fieldbus shown in FIG. 1 is a HART® fieldbus.
  • a voltage supply unit 20 (output voltage approx. 24 V) serves to supply the individual voltage to the two-wire fieldbus
  • the two-wire field bus 10 has two bus conductors L1, L2, via which the digital communication signals are transmitted in addition to the voltage or power supply of the individual field devices.
  • a computer unit 50 e.g. a personal computer PC
  • the computer unit 50 serves as an evaluation or control unit. In addition to the pure transmission of measured values from the individual field devices F1, F2 F15 to the computer unit 50, these can also be configured and parameterized from the computer unit 50. If actuators are used as field devices, they can be controlled by the control unit 50.
  • a communication resistor 100 is also arranged in the bus conductor L1, which prevents the communication signals from being short-circuited via the voltage supply unit 20.
  • FIG. 2 shows a two-wire field bus, which essentially corresponds to that of FIG. 1.
  • the latter additionally has the device for voltage stabilization 1 according to the invention, which is arranged between the voltage supply unit 20 and the two-wire fieldbus 10.
  • the two-wire fieldbus 10 is not included a PC but connected to a global communication link unit 40.
  • This global communication connection unit (Fieldgate® from Endress + Hauser®) allows e.g. B. Information exchange between two-wire field bus 10 and the Internet.
  • the field devices F1, F2, .., F15 can thus be accessed from any location.
  • HART® multidrop in combination with the device according to the invention or the method according to the invention is particularly suitable for use in the area of inventory control.
  • the device for voltage stabilization 1 also has a communication resistor 100 with a resistance value of approximately 250 ⁇ and a power value of approximately 2.5 watts. To this
  • the relay 120 is activated by control electronics 110 when the
  • the control electronics 110 also have a push button 115 for manually actuating the relay 120.
  • the bridging of the communication resistor 100 can also be triggered manually by the button 115.
  • a transistor eg FET transistor
  • This transistor would then have to be controlled by appropriately designed control electronics.
  • Two-wire field bus 10 this means a total current of 165 mA, which the voltage supply unit 20 must deliver. This would result in a voltage drop of 41.25 V on a 250 ⁇ resistor. With a maximum permissible output voltage at the voltage supply unit 20 of 45 V, this current would lead to a bus voltage U of 3.75 V.
  • the relay contact 120 is closed automatically when the voltage supply is switched on, and thus an additional current path that the
  • Communication resistor 100 bridged, switched.
  • a typical value for the bridging time is approx. 10 seconds.
  • the inventive method is that an additional current path z. B. is switched by the relay 120 when the power supply of the field bus is switched on.
  • the push button 115 can also be used to trigger a short-term manual bridging of the communication resistor 100.

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  • 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)
  • Programmable Controllers (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention concerne un dispositif de stabilisation en tension (1) pour un bus de terrain à deux fils, ce dispositif étant placé entre le bus de terrain à deux fils (10) et une unité d'alimentation en tension (20). Le dispositif comporte un élément résistance (100, 120) pouvant être momentanément court-circuité. Ainsi la tension de bus ne tombe pas en-dessous de la tension de service des appareils de terrain (F1, F2 ..... F15) raccordés au bus de terrain à deux fils (10) lors de la mise en circuit de l'alimentation en tension du bus de terrain (10).
PCT/EP2004/001984 2003-02-28 2004-02-27 Procede et dispositif de stabilisation en tension pour un bus de terrain a deux fils WO2004077183A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10309125.4A DE10309125B4 (de) 2003-02-28 2003-02-28 Vorrichtung und Verfahren zur Spannungsstabilisierung für einen Zweidrahtfeldbus
DE10309125.4 2003-02-28

Publications (1)

Publication Number Publication Date
WO2004077183A1 true WO2004077183A1 (fr) 2004-09-10

Family

ID=32864048

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/001984 WO2004077183A1 (fr) 2003-02-28 2004-02-27 Procede et dispositif de stabilisation en tension pour un bus de terrain a deux fils

Country Status (2)

Country Link
DE (1) DE10309125B4 (fr)
WO (1) WO2004077183A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007054924A1 (de) * 2007-11-15 2009-05-20 Endress + Hauser Process Solutions Ag Verfahren zum Betreiben eines Feldgerätes, sowie Kommunikationseinheit und Feldgerät
JP5232299B2 (ja) * 2008-06-17 2013-07-10 ローズマウント インコーポレイテッド ループ電流バイパスを備えるフィールド機器のためのｒｆアダプター
DE102008043199A1 (de) * 2008-10-27 2010-04-29 Endress + Hauser Process Solutions Ag Autarkes Feldgerät

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2096240A (en) * 1981-04-03 1982-10-13 Lumination Ltd Ignition systems for internal combustion engines
DE3414331A1 (de) * 1984-04-16 1985-10-17 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur erhoehung der lautstaerke bei dynamischen wandlern
GB2170931A (en) * 1985-02-02 1986-08-13 Ford Motor Co Driver circuit for solenoids
DE19736581A1 (de) * 1996-10-11 1998-04-23 Festo Ag & Co Feldbusanordnung
DE10014272A1 (de) * 2000-03-22 2001-10-25 Endress Hauser Gmbh Co Verfahren zum Umprogrammieren eines Feldgerätes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468571A (en) * 1982-10-27 1984-08-28 Saft America, Inc. Standby power system
JP3175139B2 (ja) * 1994-12-19 2001-06-11 横河電機株式会社 二線式のパルス信号伝送装置
ATE511723T1 (de) * 1999-06-21 2011-06-15 Fieldbus Foundation Blockorientiertes steuerungssystem auf einem hochgeschwindigkeits - ethernet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2096240A (en) * 1981-04-03 1982-10-13 Lumination Ltd Ignition systems for internal combustion engines
DE3414331A1 (de) * 1984-04-16 1985-10-17 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur erhoehung der lautstaerke bei dynamischen wandlern
GB2170931A (en) * 1985-02-02 1986-08-13 Ford Motor Co Driver circuit for solenoids
DE19736581A1 (de) * 1996-10-11 1998-04-23 Festo Ag & Co Feldbusanordnung
DE10014272A1 (de) * 2000-03-22 2001-10-25 Endress Hauser Gmbh Co Verfahren zum Umprogrammieren eines Feldgerätes

Also Published As

Publication number Publication date
DE10309125A1 (de) 2004-09-16
DE10309125B4 (de) 2014-01-02

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