EP4635136A1 - Procédé de transmission d'informations au moyen d'un dispositif de mesure à 2 fils - Google Patents

Procédé de transmission d'informations au moyen d'un dispositif de mesure à 2 fils

Info

Publication number
EP4635136A1
EP4635136A1 EP23817697.8A EP23817697A EP4635136A1 EP 4635136 A1 EP4635136 A1 EP 4635136A1 EP 23817697 A EP23817697 A EP 23817697A EP 4635136 A1 EP4635136 A1 EP 4635136A1
Authority
EP
European Patent Office
Prior art keywords
time
information
measurement
measuring device
transmission
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.)
Pending
Application number
EP23817697.8A
Other languages
German (de)
English (en)
Inventor
Lars KARWECK
Volker Frey
Alexander Vogel
Sascha D'angelico
Tanja Haag
Alexey Malinovskiy
Christoph Schmitt
Nicolas Schönborn
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 EP4635136A1 publication Critical patent/EP4635136A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof

Definitions

  • the invention relates to a method, in particular a computer-implemented method, for information transmission by means of a 2-wire measuring device.
  • Measuring devices in process and automation technology are used to monitor and/or determine at least one process variable of a medium, for example a chemical or physical one.
  • a medium for example a chemical or physical one.
  • measuring devices all field devices that are used close to the process and that provide or process process-relevant information are referred to as measuring devices.
  • a large number of such measuring devices are manufactured and sold by companies in the Endress + Hauser Group.
  • the process variable to be determined by the measuring device can be the fill level, the flow, the pressure, the temperature, the pH value, a redox potential or the conductivity of the respective medium.
  • Measuring devices for measuring the fill level are designed in particular as microwave fill level measuring devices, ultrasonic fill level measuring devices, time domain reflectometric fill level measuring devices (TDR), radiometric fill level measuring devices, capacitive fill level measuring devices, conductive fill level measuring devices and vibronic fill level measuring devices.
  • Measuring devices for measuring the flow work according to the Coriolis, ultrasonic, vortex, thermal and/or magnetic inductive measuring principle.
  • Pressure measuring devices are preferably so-called absolute, relative or differential pressure devices.
  • a measuring device typically comprises a sensor that comes into contact with the process at least partially and/or at least temporarily, and an electronic unit that serves, for example, to detect signals, evaluate signals and/or supply signals.
  • the electronic unit of the measuring device is typically arranged in a housing and additionally has at least one connection element for connecting the Electronic unit to the sensor and/or an external unit and to transmit data and/or energy.
  • Measuring devices can be connected to a higher-level unit, such as a control unit or a control system, via a two-wire line, i.e. a line with two separate wires.
  • the measured values of the sensors are communicated to the higher-level unit in analog form as a 4-20 mA current signal.
  • the measuring devices can also be supplied with energy via the two-wire line, but the energy available in this way is quite limited. If a measuring device requires more energy than can be provided via the two-wire line, three- or four-wire lines are used, for example.
  • measuring devices are designed as slaves and are cyclically queried by a master, which is often a higher-level unit. After the corresponding request from the master, the measuring device sends its measurement data or information to the master. The cyclical query of the measuring device's data by the master ensures the order and temporal structuring of the data received from the master. The measuring device itself does not send any time-related information to the master.
  • the task to be solved is therefore to provide a method with an improved information transfer between a measuring device and a higher-level unit.
  • the object underlying the invention is achieved by a method, in particular a computer-implemented method, for transmitting information by means of a 2-wire measuring device comprising a communication unit for transmitting at least one item of information to a higher-level unit, comprising the following method steps:
  • the measuring device acts as a master and is able to send information to the higher-level unit using the communication unit. So that the at least one piece of information can be classified in the higher-level unit, the at least one piece of information is provided with a time stamp and an address.
  • the higher-level unit can identify the measuring device using the address of the measuring device.
  • the measurement vector transmitted to the higher-level unit can be sorted chronologically using the time stamp. This makes it easier to structure the large amount of information (including from other measuring devices) that is transmitted to the higher-level unit.
  • the measurement vector is transmitted using the NAMUR Open Architecture.
  • the NAMUR Open Architecture offers a standardized information model that enables secure transmission of information from the process environment, in this case from the measuring device, to the higher-level unit.
  • an IP address is assigned to the measuring device. Automatic access to the measuring device is possible using the IP address.
  • a further embodiment provides that the information transmission is carried out at predeterminable times, in particular cyclically.
  • the predeterminable times can, for example, be based on the frequency of recording the at least one piece of information by the measuring device.
  • an information time is determined which corresponds to a recording time for recording the at least one piece of information using the measuring device.
  • the recording time is for example, a measurement time, i.e. the time at which the measured value was recorded.
  • the information time can facilitate the temporal sorting of the measurement vector in the higher-level unit.
  • a reference time is recorded in relation to the factory time, system time or time of the higher-level unit.
  • a reference time in a system or factory is specified by a master, in particular by the higher-level unit.
  • the information time is compared with the reference time, whereby, for example, time synchronization is carried out.
  • time synchronization is an adjustment of the information time to the reference time in the measuring device.
  • the higher-level unit can be designed to transmit the reference time to the measuring device, possibly cyclically. In this case, the measuring device can recognize whether there is a deviation between the information time and the reference time and carry out time synchronization if necessary.
  • a transmission time is recorded which corresponds to a transmission time of the at least one piece of information.
  • the transmission time corresponds to the transmission point time of the at least one piece of information, i.e. the time at which the measurement vector with the at least one piece of information is sent from the measuring device to the higher-level unit.
  • the transmission time is matched by a reception time which corresponds to a reception time of the at least one piece of information by the higher-level unit.
  • the time stamp used is at least the measurement time, a time difference between the measurement time and the reference time, the transmission time and/or a dead time, which is a time difference between the measurement time and the transmission time.
  • the method comprises the further steps: transmission of several measurement vectors to the higher-level unit according to predefinable transmission times, whereby a first and a second measurement vector form a measurement vector pair and the second measurement vector is transmitted with a defined time interval after the first measurement vector, storage of the reception times of the measurement vectors by the higher-level unit, determination of a transit time and/or an uncertainty of the transit time between the communication unit and the higher-level unit based on the transmission times and the reception times of the measurement vectors.
  • a runtime between the communication unit of the measuring device and the higher-level unit can be determined.
  • the runtime is also known as latency.
  • the latency usually has a so-called jitter, an uncertainty, which is caused by an irregular time delay in the transmission between the measuring device and the higher-level unit.
  • the address of the measuring device is given by a measuring location for recording the at least one piece of information.
  • the measuring location is in particular the location at which the measuring device is arranged.
  • the at least one piece of information is a measured value.
  • the measurement vector contains a measurement uncertainty with respect to the measured value, the measurement time and/or the measurement location.
  • the object is achieved according to the invention by a computer program for determining at least one process variable of a medium with computer-readable program code elements which, when executed on a computer, cause the computer to carry out a method according to at least one of the preceding embodiments.
  • the object is further achieved by a computer program product with a computer program according to the previous embodiment and at least one computer-readable medium on which at least the computer program is stored.
  • Fig. 1 a schematic representation of a measuring device and a higher-level unit.
  • Fig. 2 a schematic representation of the cyclic transmission of measurement vector pairs.
  • the method according to the invention is applicable to all types of measuring instruments, a non-limiting selection of which was mentioned above.
  • Fig. 1 shows a measuring device D, which is connected to a higher-level unit E by means of a 2-wire line.
  • the measuring device D has a communication unit K, which is set up to transmit information to the higher-level unit E and to receive information from the higher-level unit E.
  • the measuring device D is attached to a measuring location 0 on a container B, in Fig. 1 a pipe, in which a medium M is located.
  • the measuring device D is set up to determine and/or monitor at least one process variable of the medium.
  • the higher-level unit E can Computing unit R, which is designed to send, receive and process information.
  • At least one piece of information is provided with a time stamp and an address of the measuring device D.
  • the address of the measuring device D can be given by the measurement location 0 at which the at least one piece of information was recorded.
  • an IP address can be assigned to the measuring device D.
  • the time stamp is in particular the measurement time, a time difference between the measurement time and the reference time, the transmission time and/or a dead time, which is a time difference between the measurement time and the transmission time.
  • the at least one piece of information can, for example, be a measured value of the measuring device D.
  • the at least one piece of information, the time stamp and the address of the measuring device D form a measurement vector, which optionally contains a measurement uncertainty with regard to the measured value, the measurement time and/or the measurement location 0.
  • the measurement vector is transmitted to the higher-level unit E using the communication unit K.
  • the NAMUR open architecture can be used for the transmission, for example.
  • the transmission of the measurement vector is carried out in particular at predeterminable times.
  • an information time can be determined which corresponds to a recording time for recording the at least one piece of information using the measuring device D.
  • Another optional method step provides that a reference time is recorded in relation to the factory time, system time, time of the higher-level unit E.
  • a transmission time can be recorded which corresponds to a transmission time of the at least one piece of information.
  • This additionally recorded information ie the information time, the reference time and/or the transmission time, can be used to improve the temporal classification of the at least one piece of information in the higher-level unit. If necessary, the information time can be compared with its reference time and time synchronization can be carried out.
  • the transit time and/or an uncertainty of the transit time between the communication unit K and the higher-level unit E can also be determined.
  • several measurement vectors are transmitted to the higher-level unit E using the communication unit K.
  • a defined time interval is set between the transmission of a first and second measurement vector, which can be stored in particular in the measuring device D and in the higher-level unit E.
  • the time interval between the transmission of the second measurement vector and the first measurement vector can vary or be defined.
  • FIG. 2 This optional method is shown schematically in Fig. 2.
  • the upper time axis to shows the time axis of the measuring device D, while the lower axis represents the time axis of the higher-level unit E; in this example, this is the time axis of the reference time tret.
  • the measuring device D sends several measurement vectors to the higher-level unit E at transmission times tvn via the communication unit K.
  • a first measurement vector and a second measurement vector form a measurement vector pair, the respective transmission times tvi and tv2 of which are separated by a defined time interval Atr.
  • the time interval between the measurement vector pairs i.e. between tv2 and tvi , can vary or be cyclical.
  • the transmission time tvn and the reception times tref can be used to determine the propagation time and/or an uncertainty of the propagation time between the communication unit K and the higher-level unit E. This is done in particular by means of a statistical comparison of the time intervals Ati,2,3,... of the reception times tret between the first and second measurement vector of the respective measurement vector pair.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention porte sur un procédé, en particulier un procédé mis en œuvre par ordinateur, pour transmettre des informations au moyen d'un dispositif de mesure (D) à 2 fils comprenant une unité de communication (K) pour transmettre au moins une information à une unité supérieure (E). Le procédé comprend les étapes de procédé suivantes : - la fourniture de la ou des informations avec une estampille temporelle et avec une adresse, et - la transmission d'un vecteur de mesure, comprenant au moins la ou les informations, l'estampille temporelle et l'adresse du dispositif de mesure (D), à l'unité supérieure (E), au moyen de l'unité de communication (K).
EP23817697.8A 2022-12-16 2023-11-30 Procédé de transmission d'informations au moyen d'un dispositif de mesure à 2 fils Pending EP4635136A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022133731.6A DE102022133731A1 (de) 2022-12-16 2022-12-16 Verfahren zur Informationsübertragung mittels eines 2-Leiter Messgeräts
PCT/EP2023/083757 WO2024126070A1 (fr) 2022-12-16 2023-11-30 Procédé de transmission d'informations au moyen d'un dispositif de mesure à 2 fils

Publications (1)

Publication Number Publication Date
EP4635136A1 true EP4635136A1 (fr) 2025-10-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP23817697.8A Pending EP4635136A1 (fr) 2022-12-16 2023-11-30 Procédé de transmission d'informations au moyen d'un dispositif de mesure à 2 fils

Country Status (4)

Country Link
EP (1) EP4635136A1 (fr)
CN (1) CN120419133A (fr)
DE (1) DE102022133731A1 (fr)
WO (1) WO2024126070A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012101881B4 (de) * 2012-03-06 2013-11-21 Softing Ag Verfahren zur Bestimmung der Topologie eines seriellen asynchronen Datenbusses
DE102013004795A1 (de) * 2012-03-21 2013-09-26 Gabriele Trinkel System und Verfahren zum erzeugen von thermische Hot Spot zur Generierung von Zufallszahlen mit thermischen Rauschquellen im Cloud Computing
DE102019103270A1 (de) * 2019-02-11 2020-08-13 Beckhoff Automation Gmbh Verfahren zur verteilten elektrischen leistungsbestimmung

Also Published As

Publication number Publication date
WO2024126070A1 (fr) 2024-06-20
CN120419133A (zh) 2025-08-01
DE102022133731A1 (de) 2024-06-27

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