EP2335025A1 - Appareil de terrain pour l'automatisation de processus - Google Patents

Appareil de terrain pour l'automatisation de processus

Info

Publication number
EP2335025A1
EP2335025A1 EP09783147A EP09783147A EP2335025A1 EP 2335025 A1 EP2335025 A1 EP 2335025A1 EP 09783147 A EP09783147 A EP 09783147A EP 09783147 A EP09783147 A EP 09783147A EP 2335025 A1 EP2335025 A1 EP 2335025A1
Authority
EP
European Patent Office
Prior art keywords
current sink
current
controllable current
controllable
sink
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.)
Granted
Application number
EP09783147A
Other languages
German (de)
English (en)
Other versions
EP2335025B1 (fr
Inventor
Jürgen Meier
Martin Lange
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 SE and Co KG
Original Assignee
Endress and Hauser SE 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
Application filed by Endress and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Publication of EP2335025A1 publication Critical patent/EP2335025A1/fr
Application granted granted Critical
Publication of EP2335025B1 publication Critical patent/EP2335025B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 field device of process automation technology, with at least one cutting parts for outputting a current signal, with at least one default unit, which specifies at least one value, from which the current signal to be output via the interface is dependent
  • Field devices in particular measuring devices, which output signals and in particular measured values as 4.20 mA signals are known in the prior art. If there is an error in the field device, a so-called Fehiersignal is output, which is usually outside the actual signal range between 4 and 20 mA. The error signal is thus either below 4 mA or above 20 mA.
  • Error acts as a simple solution, therefore, test signals from the field devices correspondingly generate corresponding error signals during these periods, but normal process operation is therefore not possible.
  • the object of the invention is therefore to propose a field device, which allows a review of the error signaling, without this leading to an impairment, in particular the nachgeschaiteten the field device units.
  • the object is achieved by the invention in that at least one first controllable current sink and a second controllable current sink are provided, that the first controllable current sink and the second controllable Current sink are designed such that the first controllable current sink and the second controllable current sink are each adjustable to a predetermined current, and that the first controllable current sink and the second controllable current sink are so connected to the interface, that the current signal, which harbors at the interface , in the
  • the field device is in particular a 4. 20 mA signal field device.
  • An embodiment provides that the field device signals the presence of a fault of the field device by an error signal via the interface, wherein the error signal within an error signal interval Itegt, the error signal interval is in particular between 0 mA and 4 mA or 3.6 mA, if it is the interface is a 4 20 mA interface
  • An embodiment includes that the error signal has a current intensity below a predetermined value, in particular less than 3.6 mA.
  • An embodiment provides that the first controllable current sink and the second controllable current sink are connected in series.
  • An embodiment includes that at least one control unit is provided, and that the control unit is configured such that the control unit sets the first controllable current sink and the second controllable current sink respectively to a predeterminable current intensity starting from the default unit
  • control unit is configured such that the control unit starting from the default unit, the first controllable current sink and the second controllable current sink such controls that the signal applied to the interface varies within a predefined interval
  • the first controllable current sink consists of at least a first current sink, a first regulator, a first resistor and a first measuring resistor, wherein the first measuring resistor is connected in series with the first current sink and is provided for tapping a first measuring voltage
  • the second controllable current sink at least consists of a second current sink, a second regulator, a second resistor and a second measuring resistor, wherein the second measuring resistor is connected in series with the second current sink and is provided for tapping a second measuring voltage
  • An embodiment includes that a capacitor and a diode are incorporated in the first controllable current sink and / or in the second controllable current sink.
  • An embodiment includes that a second switch and a second Uberbruckungswiderstand are provided parallel to the second current sink and the second measuring resistor.
  • control unit has at least two microprocessors which essentially independently of one another control the first controllable current sink and the second controllable current sink.
  • FIG. 1 shows a representation of a schematic shading of a field device according to the invention
  • FIG. 2 shows a representation of the temporal behavior of some currents during a test with the inventive feeder of FIG. 1, FIG.
  • FIG. 1 shows a field device 10 according to the invention.
  • This is, for example, a measuring device for determining and / or monitoring a process variable.
  • the process variable is, for example, level, density, viscosity, flow, pH or temperature
  • the field device 10 has an interface 1 1, via which, for example, the measured values are output as 4 ... 20 mA signals.
  • a Signa! whose current strength is outside this range reserved for normal use.
  • the "fault current" is below 3.6 mA
  • the circuit shown here allows the test of whether this fault current can be generated without the fault signal being sent directly to the interface 11.
  • two controllable current sinks 1, 2 are connected in series.
  • a part of the first controllable current sink 1 is a current sink 11. This is an electronic load whose load current is electronically controllable. An example is a field effect transistor (FET). Furthermore, the first controllable current sink 1 comprises the first regulator RE1, the first measuring resistor R1 and the first resistor R5.
  • the controller RE1 is an operational amplifier, of which an input to the control unit 13 or specifically with the first microprocessor M1 of the control unit 13 and another input to the first resistor R5 or with the voltage drop across the first measuring resistor R1 to which is connected by an operational amplifier and whose output causes the adjustment of the current intensity of the first current sink 11.
  • the input of the regulator RE1 not connected to the control unit 13 is connected to a contact point of the interface 11 via the first resistor R5. This contact point is also connected to ground.
  • the first measuring resistor R1 also allows the tapping of a first measuring voltage U1.
  • the first current sink 11 is connected to the other contact point of the interface 1 1 and to ground.
  • a zener diode Vz and, in parallel thereto, a capacitor C are also provided between the first current sink 11 and ground.
  • the second controllable current sink 2 is constructed analogously to the first 1. It consists of the second current sink 12, the second regulator RE2, the second resistor R6 and the second measuring resistor R2. The first current sink 11 and the second current sink 2 are connected in series.
  • the second controller RE2 is controlled here via the second microprocessor M2 of the control unit 13.
  • the two microprocessors MI 1 M2 operate independently of each other and also independently of one another via the regulators RE1, RE2, the current levels of the two current sinks 11, 12 a.
  • the respective nominal value for the current at the cut parts is specified by the default unit 12. This is in particular the evaluation unit of the sensor component of the field device 10.
  • the current at the interface is thus set such that it corresponds, for example, to a determined measured value for a process variable or that it represents, for example, the reaching of a limit value.
  • the current signal is varied within a predetermined interval, ie it fidgets around the desired value of the presetting unit 12 and is thus a life signal!
  • a setpoint value of 19 mA which alternates between two current values, ie, for example, there results an output signal of 19 mA + 0.25 mA. This alternation thus means for the receiving unit 15 that the field device 10 is still alive
  • the circuit according to the invention still has the following
  • the first controllable current sink 1 has one in series with the first
  • Measuring voltage U1 is tapped. Parallel to the first current sink i1 and to the first measuring resistor R1, a first switch S1 and ⁇ are first
  • the timing or the currents occurring are shown are shown from top to bottom: the output current at the interface 11, the current at the first sense resistor R1, the current at the first bypass resistor R3, the Current at the second measuring resistor R2 and the current flow at the second bridging resistor R4.
  • switches S1 and S2 are open.
  • the control of the switches takes place, for example, via the control unit 13, or individually via the provided microprocessors M1 and M 2, which are assigned to the first controllable current sink 1 or the second controllable current sink 12.
  • the first current sink 11 is set to 19.25 mA and the second current sink 2 is set to 18.75 mA.
  • the output current at the interface 11 is determined by the second current sink 12.
  • the flowing current is measured via the two measuring resistors R1 and R2 and converted in each case via an operational amplifier in a current proportional voltage IM or U2 and the microprocessors M1 and M2 for control supplied (these compounds are not shown here for clarity).
  • test 11 the test of the first current sink 11 (test 11 in FIG. 2):
  • the switch S1 is closed.
  • the current of 18.75 mA is split across the branch 11 and R1 and the branches R3 and S1.
  • both branches substantially the same current flows when the resistors R1 and R3 are equal in size and the resistance of the switch S1 and the internal resistance of 11 are very small
  • the voltage drop across the measuring resistor R1 voltage U1 is measured and compared with a reference value
  • the default value of the current for the first current sink 11 from the first microprocessor M1 and the first controller RE1 from the above set 19.25 mA to a test value smaller 18.75 mA, z, B. set to 3 mA.
  • the first regulator RE1 adjusts the first current sink 11 so that the voltage across the resistor R5, which is measured via the first measuring resistor Ri, corresponds to the desired value specification by the first microprocessor M1, ie equal to 3 mA mA
  • the remaining current of 18.75 mA - 3 mA flows through the parallel branch of the resistor R3 and the switch S1.
  • the default value for the first current sink 11 is set to a value of large 19.25 mA via the first microprocessor M1 and the first regulator RE1 of 3 mA.
  • Partial current 18.75 ⁇ 2 mA flows again via the first current sink 11 and the first measuring resistor R1.
  • This partial current can be measured as voltage U1 and compared with a reference value. With these voltage measurements, the correct closing of the switch S1 and the capability of the first current sink can thus be achieved 11, to set a current of 3.0 mA, be checked
  • the partial current Itotal - 3 mA flows through the resistor R3 and the switch S1 to the terminals and thus to the outside flow constantly 18.75 mA. Subsequently, the switch S1 is opened. The current is still held by the second current sink 12 to 18.75 mA.
  • the default value for the second current sink 12 is set to 19.25 mA via the second microprocessor M2 and the second regulator RE2. Since the first current sink was set to a current greater than 19.25, the second current sink 12 determines the output current at the interface, which thus amounts to 19.25 mA The toastsigna! therefore varies between the two values 18.75 mA and 19.25 mA. Thus, the field device 10 shows that it is still alive.
  • the default value for the first current sink H is reduced from the value of large 19.25 mA to 18.75 mA.
  • the first current sink H determines the current to the outside (18.75 mA)
  • the voltage measurements at R1 and R2 give in the error-free case the correct current value
  • the test of the second current sink 12 For this purpose, the second switch S2 is closed. The current of currently 18.75 mA is split across branch 12 and R2 and branch R4 and S2. In both branches flows approximately the same current when the resistors R2 and R4 are equal and the resistance of the switch S2 and the internal resistance of the second current sink 12 are very small At this time, the voltage U2 is measured and compared with a reference value Then the default value the second current sink! 2 via the microprocessor M2 and the second regulator RE2 of 19.25 mA to a value less than 18.75 mA, z set to 3 mA. The second regulator RE2 sets the second current sink 12 so that the voltage across the resistor R6, which is measured via the second measuring resistor R2, the
  • the default value for the second current sink 12 becomes 3 mA is set to a value of greater than 19.25 mA.
  • the partial current 18.75 / 2 mA flows again, which can be measured via the voltage U2 and is comparable to a reference value
  • the default value for the first current sink H is set to 19.25 mA via the first microprocessor M1 and the first regulator RE1.
  • the first current sink 11 sets the current at the cutting part 11 to 19.25 mA.
  • the default value for the current value of the second current sink 12 is reduced from the value of large 19.25 mA to 18.75 mA, so that the second current sink 12 determines the current via the interface 11 to the outside at the two measuring resistors R1 and R2 the voltages U1 and U2 are measured to monitor the presence of the respective required current U2 the reference values, so the switch S2 has opened and the second current sink 12 is OK.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Tests Of Electronic Circuits (AREA)

Abstract

L'invention concerne un appareil de terrain (10) pour l'automatisation de processus, comprenant une interface (11) pour délivrer un signal de courant, et une unité de consigne (12) qui prédéfinit une valeur dont dépend un signal de courant à délivrer par le biais de l'interface (11). Selon l'invention, il existe un premier puits de courant commandable (1) et un deuxième puits de courant commandable (2), le premier puits de courant commandable (1) et le deuxième puits de courant commandable (2) peuvent respectivement être réglés sur une intensité de courant à prédéfinir et le premier puits de courant commandable (1) ainsi que le deuxième puits de courant commandable (2) sont reliés avec l'interface (11) de telle sorte que le signal de courant qui est présent sur l'interface dépend pour l'essentiel de l'intensité de courant la plus faible parmi les intensités de courant à prédéfinir sur lesquelles sont réglés le premier puits de courant commandable (1) et le deuxième puits de courant commandable (2).
EP09783147.3A 2008-10-15 2009-09-18 Appareil de terrain pour l'automatisation de processus Active EP2335025B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008042851A DE102008042851A1 (de) 2008-10-15 2008-10-15 Feldgerät der Prozessautomatisierung
PCT/EP2009/062088 WO2010043468A1 (fr) 2008-10-15 2009-09-18 Appareil de terrain pour l’automatisation de processus

Publications (2)

Publication Number Publication Date
EP2335025A1 true EP2335025A1 (fr) 2011-06-22
EP2335025B1 EP2335025B1 (fr) 2013-11-20

Family

ID=41625126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09783147.3A Active EP2335025B1 (fr) 2008-10-15 2009-09-18 Appareil de terrain pour l'automatisation de processus

Country Status (5)

Country Link
US (1) US9230428B2 (fr)
EP (1) EP2335025B1 (fr)
CN (1) CN102187180B (fr)
DE (1) DE102008042851A1 (fr)
WO (1) WO2010043468A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010039271A1 (de) * 2010-08-12 2012-02-16 Endress + Hauser Gmbh + Co. Kg Schaltung zum Regeln und Überwachen eines Signalstroms und Messumformer mit einer solchen Schaltung
WO2019228686A1 (fr) * 2018-06-01 2019-12-05 T. E. Laboratories Ltd. Détecteur de cuve à circulation portable comprenant une del-uv émettant à 235 nm

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5481200A (en) * 1993-09-15 1996-01-02 Rosemont Inc. Field transmitter built-in test equipment
DE4422867A1 (de) * 1994-06-30 1996-01-04 Itt Ind Gmbh Deutsche Sensor mit einer programmierbaren Schaltschwelle
US5740241A (en) * 1995-05-12 1998-04-14 Carrier Access Corporation T1 channel bank control process and apparatus
DE29917651U1 (de) * 1999-10-07 2000-11-09 Siemens AG, 80333 München Meßumformer sowie Prozeßleitsystem
US6384582B2 (en) * 2000-05-19 2002-05-07 Endress + Hauser Flowtec Ag Controlled current sources of two-wire measuring instruments
DE50015561D1 (de) * 2000-05-19 2009-04-02 Flowtec Ag Gesteuerte Stromquellen von Zwei-Leiter-Messgeräten
US7262628B2 (en) * 2004-07-02 2007-08-28 Primarion, Inc. Digital calibration with lossless current sensing in a multiphase switched power converter
DE10361465A1 (de) * 2003-12-23 2005-08-11 Endress + Hauser Gmbh + Co. Kg Prozessmessgerät mit erweiterter Hardwarefehlererkennung
DE102005001601B4 (de) 2005-01-12 2011-07-28 Endress + Hauser GmbH + Co. KG, 79689 Feldgerät mit Busschnittstelle
DE102005018398B4 (de) * 2005-04-20 2021-02-04 Endress + Hauser Wetzer Gmbh + Co. Kg Vorrichtung zur Ausgabe eines elektrischen Ausgangssignals und Messgerät damit
DE102006024311A1 (de) * 2006-05-24 2007-11-29 Berthold Technologies Gmbh & Co. Kg Schaltung zur Übermittlung eines analogen Signalwertes
US8054071B2 (en) * 2008-03-06 2011-11-08 Allegro Microsystems, Inc. Two-terminal linear sensor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010043468A1 *

Also Published As

Publication number Publication date
WO2010043468A1 (fr) 2010-04-22
US9230428B2 (en) 2016-01-05
US20110309813A1 (en) 2011-12-22
CN102187180B (zh) 2014-08-20
EP2335025B1 (fr) 2013-11-20
CN102187180A (zh) 2011-09-14
DE102008042851A1 (de) 2010-04-22

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