EP3526928A1 - Verfahren zur datenübertragung zwischen einem feldgerät der automatisierungstechnik und einer kommunikationsbox - Google Patents

Verfahren zur datenübertragung zwischen einem feldgerät der automatisierungstechnik und einer kommunikationsbox

Info

Publication number
EP3526928A1
EP3526928A1 EP17761235.5A EP17761235A EP3526928A1 EP 3526928 A1 EP3526928 A1 EP 3526928A1 EP 17761235 A EP17761235 A EP 17761235A EP 3526928 A1 EP3526928 A1 EP 3526928A1
Authority
EP
European Patent Office
Prior art keywords
field device
communication signal
communication
current
supply voltage
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Withdrawn
Application number
EP17761235.5A
Other languages
German (de)
English (en)
French (fr)
Inventor
Simon Gerwig
Harald SCHÄUBLE
Wolfgang Brutschin
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 EP3526928A1 publication Critical patent/EP3526928A1/de
Withdrawn legal-status Critical Current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
    • H04L12/10—Current supply arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/548—Systems for transmission via power distribution lines the power on the line being DC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40045—Details regarding the feeding of energy to the node from the bus

Definitions

  • the invention relates to a method for data transmission between a field device of automation technology and a communication box, a field device of automation technology and a communication box.
  • Flowmeters, pressure and temperature measuring devices, pH redox potential measuring devices, conductivity measuring devices, etc. which record the corresponding process variables level, flow, pressure, temperature, pH or conductivity.
  • actuators such as valves or pumps, via which the flow of a liquid in a pipe section or the level can be changed in a container.
  • Such field devices have for this purpose an analog current or voltage output, for example a 4 to 20 mA current output or a 0 to 10 V voltage output. Only the transmission of the process variable or the measured value is possible via this current or voltage output.
  • the HART protocol for example, is used.
  • the field devices can be very flexibly parameterized and put into operation or read out additional determined and stored measured values or data.
  • the HART protocol enables bidirectional communication even in a potentially explosive environment via a point-to-point transmission of at least two subscribers.
  • an FSK method Frequency Shift Keying
  • Differentiating the binary states uses different frequencies of a sinusoidal signal (eg Bell 202 standard: “0" 2200 Hz, "1" 1200 Hz).
  • the discretized and digitized data are provided by a special modem, which is in each case Participants must be present in a Hart protocol using the FSK method transmitted and received.
  • the components used for realizing a HART communication require a relatively large amount of space and, moreover, are also relatively expensive, which is undesirable particularly in the case of field devices that are inexpensive to produce.
  • the object is achieved by a method for data transmission between a field device of automation technology and a communication box, wherein the communication box is connected to the field device via a two-wire line and via the two-wire line, a supply voltage is applied to the field device to provide the field device with energy, the method includes the following steps:
  • a method is proposed in which data can be communicated via the current consumption of the field device and its supply voltage.
  • a communication box is introduced into a two-wire line between the field device and a supply unit.
  • the communication box is
  • the invention modulates a request in the form of a first communication signal to the supply voltage and demodulates the request in the field device.
  • the response in the form of a second communication signal is modulated onto an output current of the field device and this is demodulated again in the communication box.
  • the data to be communicated are modulated one to one, ie without change, to the supply voltage and not, as with others Communication method, such as HART, in which Frequency Shift Keying (Frequency Shift Keying) occurs, usually, for the purpose of data transmission changed.
  • the proposed communication method can be used, for example, in the production for programming the field device and during the final adjustment and the so-called load check. Furthermore, it is also possible via the communication method to connect the communication box to the field device in a data-conducting manner and to connect the communication box with further functionalities, e.g. Radio communications,
  • Supply voltage is varied such that the supply voltage having the first communication signal.
  • Output current is varied such that the output current is the second
  • An advantageous embodiment of the invention provides that for the demodulation of the first communication signal from the supply voltage DC voltage components of the supply voltage are filtered out by the field device.
  • An advantageous embodiment of the invention provides that the first and / or the second communication signal are generated according to a UART protocol, SPI or an MC protocol.
  • a field device of automation technology which can be connected to a two-wire line for power supply, comprising: a demodulation unit having a capacitance, wherein the capacitance separates a first communication signal, which is modulated onto the supply voltage of the field device, from the supply voltage, so that the first communication signal is available to the field device;
  • Field device is transferable.
  • An advantageous embodiment of the field device according to the invention provides that the demodulation unit and / or the modulation unit has no modem, in particular no FSK modem, or to have to separate the first communication signal from the supply voltage and / or to modulate the second communication signal.
  • a further advantageous embodiment of the field device according to the invention provides that the demodulation unit consists of the capacitance. Because of that
  • Demodulation unit consists solely of a capacity, can be the
  • Integrate demodulation unit particularly simple and space-saving in the field device or realize.
  • a further advantageous embodiment of the field device according to the invention provides that the field device is adapted to transmit a process variable via a loop current, in particular a 4 to 20mA loop current, wherein a means for current regulation, in particular a current regulator, sets the loop current according to the process variable and the current-regulating means is part of the modulation unit and further configured to modulate the second communication signal to the loop current so that the loop current comprises the second communication signal.
  • a means for current regulation in particular a current regulator
  • An alternative embodiment of the field device according to the invention provides that the field device is adapted to transmit a process variable via a voltage signal, in particular a 0 to 10 V voltage signal, wherein the
  • Modulation unit is designed such that a first terminal with a second connection for the two-wire line via a means for current regulation, which
  • a communication box for data transmission with a field device of automation technology wherein the communication box can be connected to the field device via a two-wire line, and has the following:
  • a modulation unit that is configured to perform a voltage modulation of a voltage signal of the two-wire line, so that the voltage signal of the two-wire line to a first communication signal to
  • a demodulation unit configured to generate a current signal of
  • a system of automation technology which is a field device according to one of the previously described embodiment, a communication box according to the previously described embodiment and a
  • Two-wire line which connects the field device with the communication box and over which the field device is supplied with energy has.
  • the communication box has at least one further functionality in order to also equip the field device with this functionality, the communication box exchanging data with the field device according to the method described above in relation to the further functionality Provide that the communication box is formed on the at least one further functionality to a connection of the communication box via a radio protocol or a
  • Field device exchanges data related to the radio protocol or the wired protocol.
  • FIG. 1 shows a schematic representation of the system according to the invention, comprising a field device, a communication box and a two-wire line.
  • FIG. 1 shows a schematic representation of the system 1 according to the invention, which is a field device 2 of automation technology, a communication box 4 for
  • the communication box 4 and the field device 2 are connected in a data-conducting manner via a two-wire line 3.
  • the field device 2 is supplied with a supply voltage Uv, for example.
  • a power adapter which is not shown in Fig. 1.
  • About the two-wire line 3 is next to the
  • Field device 2 is detected, to one, also not shown in Fig. 1, higher-level unit, for example.
  • a PLC instead. It goes without saying that in the case that the field device 2 acts as an actuator, via the two-wire line 3, a transmission of the
  • Control value from the parent unit to the field device 2 takes place.
  • the communication box 4 For the transmission of data going beyond that, for example for parameterization, between the communication box 4 and the field device 2, the communication box 4 has the following: A first terminal pair 13 for input-side connection of the two-wire line 3, so that the communication box 4 via the two-wire line 3 to a supply unit, such as a transmitter power supply, not shown in Fig. 1, is connected.
  • a supply unit such as a transmitter power supply, not shown in Fig. 1, is connected.
  • a modulation unit 11 which is arranged between the first and the second terminal pair 13, 14 in the communication box 4.
  • the modulation unit 11 is set up such that a voltage modulation or an amplitude modulation of a voltage signal of the two-wire line 3 takes place in accordance with a first communication signal 5 for data transmission.
  • This can, for example, by one or more diodes, which has a
  • Switch in particular a controllable field effect transistor, short-circuited, be realized.
  • the controllable switch and the diode or diodes the first communication signal to the voltage signal of
  • the voltage signal is thus available to the field device 2 as a supply voltage at the second connection terminal pair 14 of the communication box 4, so that the first communication signal 5 is transmitted via the two-wire line 3 to the field device 2. That by the
  • a demodulation unit 12 which is arranged between the first and the second terminal pair 13, 14 in the communication box 4. The demodulation unit 12 is set up so that one of the second
  • Terminal pair 14 connected two-wire line 3 derived current signal is demodulated.
  • the demodulation unit 12 preferably comprises a resistor, which is arranged between the first and the second terminal pair such that the current signal flows through the resistor, and an operational amplifier, which consists of a through the
  • Resistance generated voltage drop generates the second communication signal.
  • Communication signal 6 is shown by way of example in FIG. 1 by a "1010" signal.
  • the communication box 4 can also be equipped with a different functionality than the parameterization.
  • it can have a radio module, so that data can be exchanged wirelessly with another device via the radio module of the communication box 4 and the data between the communication box and the field device wired, according to the inventive method, be replaced.
  • a corresponding field device 2 For transmission of the additional data, a corresponding field device 2 has the following:
  • the field device 2 is supplied with energy.
  • the field device 2 is supplied with a voltage of 24 V.
  • Communication box 4 on the supply voltage V s modulated first communication signal 5 demodulates or separates.
  • the capacitor 8 can be formed, for example, by a capacitor or a plurality of capacitors connected in series and / or in parallel.
  • the first communication signal 5 is thus available after the capacitor 8 without a modem, in particular without a FSK modem, and can, for example, by a microcontroller
  • 1 shows by way of example the simplest case in which the demodulation unit 7 requires only a single capacitance 8, for example in the form of a capacitor.
  • the demodulation unit 7 requires only a single capacitance 8, for example in the form of a capacitor.
  • a modulation unit 9 which is adapted to a second
  • Output current I A of the field device 2 to the communication box 4 is transferable.
  • the modulation unit 9 performs a current modulation of
  • Output current l A or an amplitude modulation of the output current is designed as a two-wire or two-wire field device according to the 4 to 20 mA standard, and a process variable detected by the field device 2 is applied via a loop current generated by a current regulator 10 is adjustable, transmitted.
  • the current controller 10 receives in the normal measurement mode, for example from the microprocessor, a current setpoint value, which represents the process variable, and regulates the loop current to a value corresponding to the current setpoint value.
  • the current regulator 10 is also part of the modulation unit and is further adapted to apply the second communication signal 6 to the
  • the current controller adds the second one
  • Communication signal to the loop current to be set It is also conceivable, however, an alternative embodiment of the field device 2 such that the process variable is not transmitted via a loop current, but via a voltage signal.
  • the process variable can be represented by a 0 to 10V
  • the modulation unit has a means for current regulation, wherein the means comprises a first
  • Communication signal 6 are modulated on a self-current of the field device.
  • the means may comprise, for example, a resistor and a field effect transistor, wherein the field effect transistor is arranged in series with the resistor, so that the current flowing through the resistor is modulated by the field effect transistor.
  • the method for data transmission provides that in a first method step, the supply voltage V s of the field device 2 is amplitude-modulated by the communication box 4, so that a first communication signal 5 is generated.
  • the first communication signal 5 can be generated according to a UART, SPI or MC protocol.
  • the supply voltage V s applied via the two-wire line 3 to the field device 2 is demodulated so that the first communication signal 5 is obtained from the supply voltage V s applied to the field device.
  • the first communication signal 5 can subsequently
  • a microcontroller or microprocessor the field device according to the means of the first communication signal. 5
  • transmitted parameter information parameterize the field device 2.
  • a current modulation or an amplitude modulation of the output current I A of the field device takes place by the field device, so that the
  • Output current has the second communication signal.
  • Communication signal 6 is thus transmitted via the output current I A to the communication box 4.
  • the communication box 4 demodulates the output current I A , so that the second communication signal 6 from the

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
EP17761235.5A 2016-10-13 2017-08-29 Verfahren zur datenübertragung zwischen einem feldgerät der automatisierungstechnik und einer kommunikationsbox Withdrawn EP3526928A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016119548.0A DE102016119548A1 (de) 2016-10-13 2016-10-13 Verfahren zur Datenübertragung zwischen einem Feldgerät der Automatisierungstechnik und einer Kommunikationsbox
PCT/EP2017/071599 WO2018068941A1 (de) 2016-10-13 2017-08-29 Verfahren zur datenübertragung zwischen einem feldgerät der automatisierungstechnik und einer kommunikationsbox

Publications (1)

Publication Number Publication Date
EP3526928A1 true EP3526928A1 (de) 2019-08-21

Family

ID=59761953

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17761235.5A Withdrawn EP3526928A1 (de) 2016-10-13 2017-08-29 Verfahren zur datenübertragung zwischen einem feldgerät der automatisierungstechnik und einer kommunikationsbox

Country Status (5)

Country Link
US (1) US10840973B2 (zh)
EP (1) EP3526928A1 (zh)
CN (1) CN109923831B (zh)
DE (1) DE102016119548A1 (zh)
WO (1) WO2018068941A1 (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
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US20190268038A1 (en) * 2016-10-13 2019-08-29 Endress+Hauser SE+Co. KG Method for transferring data between an automation field device and a communication box
US10840973B2 (en) * 2016-10-13 2020-11-17 Endress+Hauser SE+Co. KG Method for transferring data between an automation field device and a communication box

Also Published As

Publication number Publication date
US10840973B2 (en) 2020-11-17
CN109923831A (zh) 2019-06-21
CN109923831B (zh) 2022-06-07
DE102016119548A1 (de) 2018-04-19
WO2018068941A1 (de) 2018-04-19
US20190268038A1 (en) 2019-08-29

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