EP1520262A1 - Verfahren zur funktional sicheren daten bertragung zwischen einem sensor und einer auswerteeinheit - Google Patents
Verfahren zur funktional sicheren daten bertragung zwischen einem sensor und einer auswerteeinheitInfo
- Publication number
- EP1520262A1 EP1520262A1 EP03732586A EP03732586A EP1520262A1 EP 1520262 A1 EP1520262 A1 EP 1520262A1 EP 03732586 A EP03732586 A EP 03732586A EP 03732586 A EP03732586 A EP 03732586A EP 1520262 A1 EP1520262 A1 EP 1520262A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- evaluation unit
- data
- channel
- signal
- 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- Withdrawn
Links
- 238000011156 evaluation Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 title claims abstract description 14
- 238000005516 engineering process Methods 0.000 description 5
- 230000006854 communication Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 230000007175 bidirectional communication Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004801 process automation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008054 signal transmission 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 method for functionally safe data transmission between a sensor and an evaluation unit, which are connected to one another via a signal line.
- sensors are often used to record process variables. Examples include temperature measuring devices that include the temperature of a process medium, flow meters that measure the flow of a process medium in a pipeline section, or level meters that measure the level of a liquid or a bulk material in a container.
- the information from sensors is not required in the immediate vicinity of the sensor, but in a more distant control room or in a control room.
- the sensor is connected to a corresponding evaluation unit via a signal line.
- the data transmission between the sensor and the evaluation unit can, for. B. according to the HART® standard.
- This enables digital communication between the sensor and the evaluation unit.
- the communication signals are generated using a microprocessor and appropriate software.
- the disadvantage here is that the combination of microprocessor and software offers a multitude of error possibilities that are not sufficient for security-relevant applications.
- the sensor Via the bidirectional digital communication between the sensor and the evaluation unit, e.g. B. the sensor can be configured from the evaluation unit.
- a simple way of data transmission between a sensor and an evaluation unit is in PFM technology.
- a 10 mA quiescent current is superimposed on current pulses, the repetition frequency of which corresponds to the sensor state.
- a vibration limit switch FTL325P from Endress + Hauser®
- FTL325P from Endress + Hauser®
- 50 Hz corresponds to the covered state
- 150 Hz to the free state errors are coded with O Hz.
- the disadvantage of this type of signal transmission is that no information is transmitted from the evaluation unit to the sensor.
- the object of the invention is to provide a method for functionally safe data transmission between a sensor and an evaluation unit which does not have the disadvantages mentioned above, which in particular enables safe data transmission and at the same time bidirectional communication between evaluation unit and sensor.
- An essential idea of the invention is to provide 2 channels for the data transmission between the sensor and the evaluation unit, the first channel being for digitally generated signals and the second channel being for analog generated signals.
- safety-relevant signals can be transmitted between the sensor and evaluation unit in a purely analog way.
- This analogous path corresponds to the strict safety-relevant regulations.
- Fig. 1 sensor with HART interface in a schematic representation.
- Fig. 2 sensor with PFM interface.
- Fig. 3 sensor and evaluation unit with 2 data channels.
- the 1 shows a sensor S1, which is connected to an evaluation unit AW via a signal line SL.
- the sensor S1 has a sensor MA, which detects the process variable to be determined.
- the sensor MA is connected to an AD converter, which is followed by a microprocessor ⁇ P S1.
- the microprocessor ⁇ P S1 digitally processes the sensor signal into an output variable. This output variable is transmitted to the evaluation unit AW via the interface 11.
- the evaluation unit has an interface 12 corresponding to the interface 11, which is connected to a microprocessor ⁇ P AW1.
- the microprocessor ⁇ P AW1 is connected to a display A and allows the switching of a limit value relay, not shown, depending on predetermined limit values. Via a further physical interface, also not shown, z. B. a connection to a personal computer (PC) for parameterization possible.
- PC personal computer
- the 2 shows a sensor S2, which is connected to an evaluation unit AW2 via a signal line SL.
- the sensor S2 also has a sensor MA, which is connected to an evaluation circuit AS1.
- the sensor signal is processed in the evaluation circuit AS1 using purely analog technology and converted into an output signal which is transmitted in a PFM interface 13 to an evaluation unit AW2 via a signal line SL.
- the evaluation unit AW2 has also has an interface 14 matching the interface 13, which is connected to an evaluation circuit AS2.
- the 3 shows a sensor S, which are connected to one another with an evaluation unit AW via a signal line SL by means of 2 data channels.
- the sensor S also has a sensor MA, an A / D converter A / D, a microprocessor ⁇ PS and an interface IS1. Digital signal processing takes place in the microprocessor ⁇ PS.
- the output signal of the microprocessor ⁇ PS is forwarded to the interface IS1, which converts the output signal into a HART signal.
- the sensor has an analog evaluation circuit ASS, which is connected to a superimposition unit U via a PFM interface IS3.
- the evaluation circuit ASS can also have a low-cost microprocessor, then two microprocessors are available on the sensor side, which increases safety. In a simpler variant, a microprocessor takes over the conversion into the HART signal and the PFM signal.
- the HART signal and the PFM signal are simply superimposed in the superimposition unit U and transmitted to the evaluation unit AW via the signal line SL.
- the HART signal and the PFM signal are separated in a separation unit T and supplied to the corresponding interfaces 12 and 14, respectively.
- the interface 12 is connected to a microprocessor ⁇ P, in which digital signal processing takes place.
- the interface 14 is connected to an analog evaluation circuit ASAW, in which the PFM signal is evaluated in analog technology.
- the HART part can be used, for example, to parameterize the sensor via the display in the evaluation unit AW (TAG, measuring range, unit, ).
- the PFM part can be used to switch off a pump or a valve via a relay, not shown. This is about a safe shutdown to prevent a container from overflowing.
- An essential idea of the invention is to transmit data between a sensor and an evaluation unit in two separate data channels, one data channel transmitting a signal that has been generated at least partially in digital technology and the second channel for signals that are purely analog Generated way.
- safety-relevant signals that comply with strict safety-relevant regulations can be transmitted on the second channel.
- the invention is not limited to vibration limit switches as sensors. It can be applied to any sensors (capacitive, radiometric, pressure, etc.).
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10230216 | 2002-07-04 | ||
| DE2002130216 DE10230216A1 (de) | 2002-07-04 | 2002-07-04 | Verfahren zur funktional sicheren Datenübertragung zwischen einem Sensor und einer Auswerteeinheit |
| PCT/EP2003/006964 WO2004006206A1 (de) | 2002-07-04 | 2003-07-01 | Verfahren zur funktional sicheren datenübertragung zwischen einem sensor und einer auswerteeinheit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1520262A1 true EP1520262A1 (de) | 2005-04-06 |
Family
ID=29761652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03732586A Withdrawn EP1520262A1 (de) | 2002-07-04 | 2003-07-01 | Verfahren zur funktional sicheren daten bertragung zwischen einem sensor und einer auswerteeinheit |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1520262A1 (de) |
| AU (1) | AU2003238518A1 (de) |
| DE (1) | DE10230216A1 (de) |
| WO (1) | WO2004006206A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007048677A1 (de) | 2007-10-10 | 2009-04-16 | Hottinger Baldwin Messtechnik Gmbh | Verfahren zur Erkennung eines Sensors an einem Messverstärker und zur selbsttätigen Anpassung eines Sensors an einen Messverstärker |
| DE102022123352A1 (de) * | 2022-09-13 | 2024-03-14 | Turck Holding Gmbh | Signalübertragungssystem zur Übertragung einer Hauptprozessvariablen und weiteren Daten zwischen einem Feldgerät und einer übergeordneten Einheit sowie ein entsprechendes Verfahren |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE458972B (sv) * | 1984-06-04 | 1989-05-22 | Yamatake Honeywell Co Ltd | Dialogfoerfarande samt anordning foer genomfoerande av foerfarandet |
| DE3420795C2 (de) * | 1984-06-04 | 1991-05-08 | Kurt 7505 Ettlingen Köhler | Verfahren zur Übertragung von digitalen und analogen Signalen zwischen einer Zentrale und mehreren Unterstationen |
| DE3842484A1 (de) * | 1988-12-16 | 1990-06-21 | Bayerische Motoren Werke Ag | Kommunikationseinrichtung fuer kraftfahrzeuge |
| US5469746A (en) * | 1993-03-30 | 1995-11-28 | Hitachi, Ltd. | Electromagnetic flow meter |
| US5838241A (en) * | 1996-12-18 | 1998-11-17 | Robertshaw Controls Company | Liquid level transmitter |
| DE19713981A1 (de) * | 1997-04-04 | 1998-10-15 | Siemens Ag | Vorrichtung zum Zuführen eines analogen und eines digitalen Signals zu einer Recheneinheit und Vorrichtung zur Regelung des Stromflusses durch einen Verbraucher |
| FI114745B (fi) * | 1998-06-01 | 2004-12-15 | Metso Automation Oy | Kenttälaitteiden hallintajärjestelmä |
| DE29907626U1 (de) * | 1999-04-29 | 1999-09-23 | Hüllwegen, Josef, Ing.(grad.), 33184 Altenbeken | Einheiten zum Auswerten, Erzeugen und Übertragen von Mehrkanalsignalen |
| DE19920299B4 (de) * | 1999-05-03 | 2008-01-03 | Siemens Ag | Verfahren sowie Vorrichtung zur Erfassung, Übertragung und Verarbeitung sicherheitsgerichteter Signale |
| DE19943503B4 (de) * | 1999-09-10 | 2004-03-11 | Phoenix Contact Gmbh & Co. Kg | Einrichtung zur sicherheitsrelevanten Automatisierung von Maschinen und Anlagen mit elektrischen Antrieben |
| DE19946776A1 (de) * | 1999-09-29 | 2001-04-12 | Bosch Gmbh Robert | Verfahren und Vorrichtung zu bidirektionalen Kommunikation wenigstens zweier Kommunikationsteilnehmer |
| DE59914913D1 (de) * | 1999-10-07 | 2009-01-08 | Endress Hauser Gmbh Co | Verfahren und eine Vorrichtung zur Funktionsüberprüfung eines Grenzschalters |
-
2002
- 2002-07-04 DE DE2002130216 patent/DE10230216A1/de not_active Withdrawn
-
2003
- 2003-07-01 WO PCT/EP2003/006964 patent/WO2004006206A1/de not_active Ceased
- 2003-07-01 EP EP03732586A patent/EP1520262A1/de not_active Withdrawn
- 2003-07-01 AU AU2003238518A patent/AU2003238518A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004006206A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10230216A1 (de) | 2004-01-22 |
| WO2004006206A1 (de) | 2004-01-15 |
| AU2003238518A1 (en) | 2004-01-23 |
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Legal Events
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| 17P | Request for examination filed |
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| AX | Request for extension of the european patent |
Extension state: AL LT LV MK |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: GRITTKE, UDO |
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| 17Q | First examination report despatched |
Effective date: 20050531 |
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| DAX | Request for extension of the european patent (deleted) | ||
| 17Q | First examination report despatched |
Effective date: 20050531 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 20070824 |