EP2335025A1 - Feldgerät der prozessautomatisierung - Google Patents
Feldgerät der prozessautomatisierungInfo
- 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
Links
- 238000004801 process automation Methods 0.000 title claims abstract description 5
- 230000001419 dependent effect Effects 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims abstract description 3
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 18
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910017435 S2 In Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
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
Description
Claims
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 (de) | 2008-10-15 | 2009-09-18 | Feldgerät der prozessautomatisierung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2335025A1 true EP2335025A1 (de) | 2011-06-22 |
EP2335025B1 EP2335025B1 (de) | 2013-11-20 |
Family
ID=41625126
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09783147.3A Active EP2335025B1 (de) | 2008-10-15 | 2009-09-18 | Feldgerät der prozessautomatisierung |
Country Status (5)
Country | Link |
---|---|
US (1) | US9230428B2 (de) |
EP (1) | EP2335025B1 (de) |
CN (1) | CN102187180B (de) |
DE (1) | DE102008042851A1 (de) |
WO (1) | WO2010043468A1 (de) |
Families Citing this family (2)
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 (en) * | 2018-06-01 | 2019-12-05 | T. E. Laboratories Ltd. | Portable flow cell detector comprising a uv-led emitting at 235 nm |
Family Cites Families (12)
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 |
-
2008
- 2008-10-15 DE DE102008042851A patent/DE102008042851A1/de not_active Withdrawn
-
2009
- 2009-09-18 WO PCT/EP2009/062088 patent/WO2010043468A1/de active Application Filing
- 2009-09-18 EP EP09783147.3A patent/EP2335025B1/de active Active
- 2009-09-18 CN CN200980141117.9A patent/CN102187180B/zh active Active
- 2009-09-18 US US13/124,417 patent/US9230428B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010043468A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010043468A1 (de) | 2010-04-22 |
US9230428B2 (en) | 2016-01-05 |
US20110309813A1 (en) | 2011-12-22 |
CN102187180B (zh) | 2014-08-20 |
EP2335025B1 (de) | 2013-11-20 |
CN102187180A (zh) | 2011-09-14 |
DE102008042851A1 (de) | 2010-04-22 |
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