EP4260015A1 - Procédé de détection de sorties de signaux de mesure erronées provenant d'un dispositif de terrain, système de détection et dispositif de terrain - Google Patents

Procédé de détection de sorties de signaux de mesure erronées provenant d'un dispositif de terrain, système de détection et dispositif de terrain

Info

Publication number
EP4260015A1
EP4260015A1 EP20824178.6A EP20824178A EP4260015A1 EP 4260015 A1 EP4260015 A1 EP 4260015A1 EP 20824178 A EP20824178 A EP 20824178A EP 4260015 A1 EP4260015 A1 EP 4260015A1
Authority
EP
European Patent Office
Prior art keywords
measurement signal
field device
detection system
analog
error
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
EP20824178.6A
Other languages
German (de)
English (en)
Inventor
Clemens Hengstler
Stefan Kaspar
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.)
Vega Grieshaber KG
Original Assignee
Vega Grieshaber 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 Vega Grieshaber KG filed Critical Vega Grieshaber KG
Publication of EP4260015A1 publication Critical patent/EP4260015A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/08—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown

Definitions

  • the invention relates to a method for detecting erroneous measurement signal outputs from a field device.
  • the invention also relates to a detection system for detecting erroneous measurement signal outputs from a field device.
  • the invention also relates to a field device.
  • Field device refers to the area outside of control rooms. Field devices can therefore be actuators, sensors and measuring transducers in particular.
  • field devices are often used that are used to record and/or influence process variables.
  • Examples of such field devices are filling level measuring devices, limit level measuring devices and pressure measuring devices with sensors that record the corresponding process variables filling level, limit level or pressure.
  • Typical application scenarios for such field devices include areas such as flood forecasting, inventory management or other distributed measuring tasks.
  • Known field devices of the aforementioned type make it possible to transmit measured values, so that a higher-level unit triggers a predetermined action based on the measured value determined. For example, based on the measured value of a fill level measuring device, an inlet can be closed or an outlet can be opened if a limit value is exceeded.
  • a measured value can be transmitted as an analog current signal between 4 mA and 20 mA.
  • This type of signal transmission is standardized in DIN IEC 60381-1 (analog signals for regulation and control systems; analog direct current signals). Nevertheless, measured values can also be transmitted as voltage signals.
  • a remote station can receive the analog voltage signals and determine measured values from them.
  • the wired analogue transmission of measured values is very simple and has other advantages.
  • a two-wire system A field device can be supplied with energy, but the two-wire system can also be used to transmit measured values at the same time.
  • an error occurs during the transmission of the measured values, this can have serious consequences.
  • Many faults cannot be detected remotely due to the analogue connection of the field device. This applies in particular to deviations in measured values.
  • the publication EP 1 864 268 B1 describes an interface of a field device to a two-wire system.
  • the interface regulates an output current.
  • the interface is equipped with a checking circuit to detect output errors.
  • the checking circuit measures a current strength in the two-wire system and can thus determine whether the two-wire system is supplied with a desired current strength. If this is not the case, a calibration process can be triggered. In this way, errors can be detected and corrected directly in the field device.
  • the field device has a more complex structure due to the necessary checking circuit. It is not possible to check the field device remotely.
  • the invention is therefore based on the object of specifying a method that allows faulty measurement signal outputs from a field device to be detected remotely. It is a further object of the invention to provide a detection system that enables faulty measurement signal outputs from a field device to be detected remotely. A further object of the invention is to specify a field device whose measurement signal outputs can be checked remotely. The objects are achieved by a method for detecting erroneous measurement signal outputs from a field device according to claim 1, by a detection system according to claim 20 and by a field device according to claim 21.
  • a method for detecting erroneous measurement signal outputs from a field device comprising the steps: outputting a measured value by the field device as a first measurement signal, outputting the measured value by the field device as a second measurement signal, receiving the first measurement signal and the second measurement signal or values derived from it by a detection system, determination of a measurement signal deviation between the first measurement signal and the second measurement signal by the detection system and checking by the detection system whether an error is present, taking into account the measurement signal deviation and optionally taking into account at least one other error condition.
  • the first measurement signal and the second measurement signal preferably reflect a measured value determined by a sensor or sensors of the field device.
  • the detection system can receive the first and the second measurement signal directly. However, it is also possible for the detection system to only receive values that are derived from the first measurement signal and/or the second measurement signal. This is the case, for example, when an intermediary receives the first measurement signal, subjects the first measurement signal to analog-to-digital conversion and then forwards the measurement signal, which has thus been digitized, to the detection system in the form of a measurement data packet.
  • the first and the second measurement signal can be output by means of different communication interfaces of the field device.
  • the first measurement signal and the second measurement signal can be output via the same communication interface of the field device. It is essential that due to the double output of the measured value, it can be checked whether it was transmitted correctly.
  • the first measurement signal is output via a wired interface of the field device and the second measurement signal is output via a radio interface of the field device. Redundancy is thus established by means of radio transmission.
  • Bluetooth, LoRaWAN (Long Range Wide Area Network), NB-IoT (NarrowBand-IoT), LTE-M (Long Term Evolution) or any other radio transmission technology can be used as radio transmission technology.
  • the first measurement signal can be output via a wired interface of the field device and the second measurement signal can also be output via a wired interface of the field device. Redundancy is consequently ensured by means of transmission via two different data cables.
  • the first measurement signal is an analog measurement signal and the second measurement signal is a digital measurement signal.
  • the first measurement signal can be output in an analog, wired manner, and the second measurement signal can be transmitted digitally by radio.
  • both the first measurement signal and the second measurement signal are transmitted by cable, for example via two separate data cables.
  • the second measurement signal could be transmitted using a standard such as Ethernet, Profibus or IO-Link, for example.
  • the first measurement signal and the second measurement signal are transmitted via the same data cable, the first measurement signal being an analog measurement signal and the second measurement signal being a digital measurement signal. According to the invention, this could be implemented by modulating the second measurement signal in digital form onto the first measurement signal in analog form. This is possible, for example, using the fieldbus protocol HART (Highway Addressable Remote Transducer).
  • HART Highway Addressable Remote Transducer
  • the measurement signal deviation between the analog measurement signal and the digital measurement signal is determined by the detection system, it is preferably checked whether the analog measurement signal and the digital measurement signal correspond to one another. If they don't do this, then this is usually due to the fact that either the analog measurement signal or the digital measurement signal is corrupted. Due to the robustness of the digital signal transmission and the methods for error detection and correction that can be used, it can be assumed that in the event of a deviation between the analog measurement signal and the digital measurement signal in in the majority of cases there is a falsification of the analog measurement signals. The falsification can be based, for example, on a hardware error in the field device, but can also be caused by damage to or a fault in a wired communication link.
  • the field device does not necessarily have to process the analog measurement signal and the digital measurement signal directly, but can also work with values derived therefrom.
  • various criteria can be applied. In particular, not only does a result of the determination of the measurement signal deviation have to be evaluated, but other parameters and/or system states can also be evaluated.
  • the analog measurement signal and the digital measurement signal are normalized to a matching unit, so that normalized values result, and a difference is then formed between the normalized values.
  • Standardization is a step that makes the analog measurement signals comparable with the digital measurement signals.
  • the analog measurement signal and/or the digital measurement signal can be converted into a different unit.
  • the determination of the measurement signal deviation includes the following steps: provision of an analogue target measurement value by converting the digital measurement signal into an analogue unit, provision of an analogue actual measurement value based on the analogue measurement signal and calculation of a difference between the analogue target value and the analog actual value.
  • the analog target value is based on the digital measurement signal and indicates, for example, an expected current or an expected voltage.
  • the analog actual value must be provided.
  • the detection system can convert the analog measurement signal into a digital format by analog-to-digital conversion.
  • the detection system may already have the analog actual value in digital form because a detection unit arranged between the field device and the detection system recorded the analog measurement signal, converted it accordingly and forwarded it to the detection system in the form of a measurement data package. Now it can be checked whether the analog target value corresponds to the analog Actual value corresponds. To do this, the difference between the analog target value and the analog actual value is formed.
  • the analog measurement signal can be a current intensity. In this case, it is consequently checked whether a current strength of the analog measurement signal corresponds to a current strength expected on the basis of the digital measurement signal.
  • the analog measurement signal and the digital measurement signal are converted into a measurement value, for example into a pressure measured by the field device. This results in two pressure values. The pressure values can then be compared with one another.
  • the analog measurement signal can also be compared with the digital measurement signal by means of other calculation methods.
  • the method preferably includes the output of a configuration data set of the field device by the field device and the receipt of the configuration data set by the detection system.
  • the configuration data record preferably contains configuration data of the field device.
  • the configuration data record can contain configuration data that characterize the relationship between the measured value measured by the field device and the analog measurement signal.
  • the configuration data record can contain at least one conversion factor and/or one offset value.
  • the field device could be configured to output a current of 4 mA as the analog measurement signal when measuring a pressure of 1 bar and a current of 20 mA when the pressure is 2 bar.
  • the configuration data record contains information that allows a remote station to calculate, based on a measured current of e.g. 12 mA, that the field device has measured a pressure of 1.5 bar.
  • the detection system uses the configuration data set when determining the measurement signal deviation in order to normalize the analog measurement signal and the digital measurement signal to the matching unit. Only by standardizing the measurement signals can they be compared with one another. However, variants of the invention are also possible in which configuration data characterize the ratio of the measured by the field device Measured value related to the analogue measurement signal can be entered manually into the detection system.
  • a detection unit records the analog measurement signal, the detection unit performing analog-to-digital conversion of the analog measurement signal into a measurement data packet and the detection unit transmitting the measurement data packet to the detection system.
  • the detection unit is preferably a device for controlling the field device and/or for evaluating the measured values recorded by the field device.
  • the detection unit is often arranged spatially close to the field device and can also be used to supply it with energy.
  • the acquisition unit can acquire the analog measurement signal and forward it to the detection system, for example in the form of a measurement data packet that contains the analog measurement signal in digitized form.
  • the detection unit can have a radio interface, for example, in order to be able to communicate with the detection system.
  • communication with the detection system is also possible in a different way, for example via a communication network such as the Internet.
  • a communication network such as the Internet.
  • embodiments of the invention are possible in which the detection unit and the detection system are combined with one another.
  • the detection system can be integrated into the detection unit.
  • the acquisition unit to provide the measurement data packet with a time stamp.
  • the time stamp preferably identifies a point in time at which the detection unit received the analog measurement signal. This allows the detection system to check whether the analog measurement signal and the digital measurement signal have been output by the detection system in close proximity to one another.
  • the first measurement signal and the second measurement signal are output by the field device at a time interval from one another.
  • the measurement signals compared with one another were therefore output at different times, for example on different days, but shorter or longer time intervals are also possible. This is permissible in particular when the measured values recorded by the field device do not change very quickly. Change However, if the measured values detected by the field device change relatively quickly, then the first measurement signal and the second measurement signal must have been output by the field device in a sufficiently short period of time.
  • a size of a time window can be specified, from which the first and the second measurement signal may originate, so that they can be compared with one another according to the method according to the invention. If a comparatively large time window is set, then the second measurement signal only needs to be transmitted comparatively seldom via the radio interface. Less energy is therefore required to send the second measurement signals.
  • the field device preferably provides the second measurement signal with a time stamp. This can be implemented in particular when the second measurement signal is a digital measurement signal. According to the invention, it is also possible for the detection system to log times at which the first measurement signal, the second measurement signal or values derived from these arrive at the detection system. Corresponding time intervals can be determined from this.
  • the detection system determines whether a threshold value predefined for the measurement signal deviation is exceeded. If, based on the second measurement signal, it is to be expected, for example, that the field device will output a current of 6 mA as the first measurement signal, and a threshold value of 1 mA is provided, then first measurement signals of 5.1 mA or 6 .5 mA is permissible, but a measuring signal of 7.5 mA is not. Slight deviations in the first measurement signal that do not falsify the measured value too much can thus be ignored.
  • the detection system takes into account several pairs of first and second measurement signals when checking whether the error is present, the pairs of first and second measurement signals being output by the field device at different times. Consequently, several measurement signal comparisons are carried out, according to advantageous embodiments also over a longer period of time. Results of the measurement signal comparisons can be averaged, for example. Thus, a temporary Disturbance or a short-term deviation of the measurement signals are not necessarily classified as an error.
  • the detection system measures a period of time since receipt of a last second measurement signal or a value derived therefrom and establishes the error if the measured period of time exceeds a predefined maximum period of time. It is thus checked that second measurement signals or values derived therefrom are not received by the detection system at too great a time interval. If this is not the case, faulty measurement signal outputs from the field device can no longer be identified. According to this embodiment of the invention, this is classified as an error case.
  • the first measurement signal is preferably a current signal.
  • a current intensity is thus output which represents a measured value measured by the field device.
  • the first measurement signal can be a voltage signal or a signal of some other type.
  • the field device outputs the first measurement signal via a two-wire system.
  • the two-wire system preferably has a forward conductor and a return conductor.
  • the two-wire system is suitable for powering the field device.
  • Data is also transmitted in analog form via the two-wire system, in this case the first measurement signal.
  • the transmission of data via the radio interface of the field device is preferably encrypted.
  • Data transmitted via the radio interface are preferably checked for errors by the detection system by comparing a checksum such as a CRC code or the like.
  • the transmission via the radio interface preferably takes place at regular time intervals.
  • the configuration data set mentioned above it is also possible for the configuration data set mentioned above to be transmitted to the detection system by means of the radio interface.
  • the second measurement signal is either received directly by the detection system or it reaches it indirectly, possibly by forwarding it via various nodes.
  • the detection system can be a computer or a network of several computers, in which case the computer or the network of computers can be equipped with communication interfaces of various types.
  • the detection system can be implemented in particular by a cloud system in which software for monitoring field devices runs.
  • the detection system preferably emits an error signal when the error is detected.
  • the error signal is to be understood as a signal that is used to notify a remote station that the field device may no longer be functional, that communication with the field device may no longer be working, or that some other type of error has occurred.
  • the detection system it is possible for the detection system to inform a responsible person about the error by e-mail, by SMS, by means of a push message in an app or in some other way. The person responsible can then take suitable measures to avoid or minimize consequential damage caused by the suspected defective field device.
  • the detection system if there is an error, transmits a command to the field device to put the field device into a safe state.
  • a field device that outputs the measured values as analog current signals, only values smaller than 3.6 mA or larger than 21 mA are then output, for example, which are not valid measured signals.
  • the detection system if there is an error, to transmit a command to the field device to restart the field device.
  • the person responsible to send a command to the field device to set the field device to a safe state, to shut down the field device or to restart the field device.
  • a detection system for detecting erroneous measurement signal outputs from a field device which is set up to carry out the following steps: receiving a first measurement signal, receiving a second measurement signal, determining a measurement signal deviation between the first measurement signal and the second measurement signal and Checking whether there is an error, taking into account the measurement signal deviation and optionally taking into account at least one other error condition.
  • the detection system preferably has a radio interface and is set up to receive the second measurement signals via the radio interface. It is also advantageous if the detection system has a wired interface and is set up to receive the first measurement signals via the wired interface.
  • the radio interface preferably forms part of the detection system.
  • the detection system is preferably implemented by a system of distributed, networked computers. The detection system is preferably suitable for carrying out the method described above and has the necessary features for this.
  • a field device which has at least one sensor unit for acquiring a measured value, the field device being set up to output the measured value as a first measurement signal and as a second measurement signal. It is preferred if the field device has a wired interface and a radio interface, the field device being set up to output the first measurement signal via the wired interface and the second measurement signal via the radio interface. Regardless of the type of interface used, the first measurement signal is preferably an analog measurement signal and the second measurement signal is a digital measurement signal.
  • the field device is preferably a filling level measuring device, a limit level measuring device or a pressure measuring device.
  • the sensor unit can be a capacitive pressure measuring cell, but depending on the area of application it can also be a sensor unit of another type.
  • the field device is preferably suitable for carrying out the method described above and has the necessary features for this.
  • the field device cannot receive any data via the radio interface or cannot process data received via the radio interface as commands. This prevents the field device from being manipulated by external commands.
  • the radio interface allows data to be received.
  • a field device according to this embodiment is preferably set up in such a way that it can be switched to a safe operating state and/or switched off by means of an external command.
  • FIG. 1 shows a schematic representation of a computer topology with a field device, with a detection unit and with a detection system
  • FIG. 2 shows a flow chart of the method according to the invention for the detection of erroneous measurement signal outputs
  • FIG. 3 shows a flow chart that explains the partial steps of the method according to the invention in more detail.
  • the field device 1 shows a schematic representation of a computer topology with a field device 1, with a detection unit 2 and with a detection system 3.
  • the field device 1 has a sensor unit 4, which is a capacitive pressure measuring cell. By means of this, for example, a pressure of a surrounding fluid can be measured.
  • the field device 1 has a wired interface 5 for outputting a measured value.
  • the wired interface 5 allows current signals to be output via a two-wire system 6 .
  • the two-wire system 6 is also used to supply energy to the field device 1 .
  • the field device 1 is connected to the detection unit 2 via the two-wire system 6 .
  • the detection unit 2 supplies the field device 1 with power via the two-wire system 6 .
  • the detection unit 2 reads in first measurement signals, which the field device 1 outputs via the two-wire system 6 .
  • the first measurement signals are analog measurement signals.
  • the detection unit converts the analog measurement signals into a digital form and sends them as measurement data packets to the detection system 3 via a communication network 7.
  • the field device 1 also has a radio interface 8, which outputs second measurement signals.
  • the radio interface 8 sends the second measurement signals as radio signals 9, which reflect the measured value in digital form.
  • the second measurement signals are therefore digital measurement signals.
  • the radio signals 9 are received by a further radio interface 8 which is associated with the detection system 3 .
  • the detection system 3 is a cloud computer network that runs a computer program for monitoring field devices 1 .
  • a measurement step 10 the field device described above measures a pressure.
  • the pressure is output in an output step 11 via the wired interface of the field device and via the radio interface of the field device as the first or the second measurement signal.
  • the field device outputs the measured value as a current strength via the two-wire system and also sends the measured value in digital form via its radio transmitter.
  • the detection system receives a measurement data packet derived from the first measurement signal and the second measurement signal.
  • the receiving step 12 is preceded by the fact that the detection unit measures the current strength of the first measurement signal, converts it into a digital format, generates the measurement data packet from it and transmits the measurement data packet to the detection system.
  • a measurement signal deviation between the first measurement signal and the second measurement signal is determined. If the first measurement signal does not match the second measurement signal, then there may be an error. The error can be caused by a field device error or by a communication error.
  • the detection system checks whether an error is present. This is the case, for example, when the measurement signal deviation exceeds a predefined value. However, the detection system also checks whether it regularly receives second measurement signals. If this is no longer the case, then this indicates an error in the field device. In the event of an error, the test step is followed by an information step 15.
  • the person responsible is informed by the detection system by means of an e-mail or by means of a push message in an app that the field device is no longer working properly. If there is no error, then in a protocol step 16 the detection system only stores the determined measurement signal deviation.
  • FIG. 3 shows a flow chart that explains the partial steps of the method according to the invention in more detail.
  • the sub-steps are performed in the determination step described above.
  • the field device transmits a configuration data record of the field device to the detection system via its radio interface.
  • the configuration data set contains information that allows the first measurement signal to be calculated from the second measurement signal.
  • the detection system normalizes the first Measurement signal and the second measurement signal on a matching unit.
  • the matching unit is the unit of the first measurement signal, here a current strength in mA.
  • the measurement data packet derived from the first measurement signal and available to the detection system already specifies the current in mA. Thus, only the second measurement signal has to be converted into the unit mA. This is done with the help of the configuration data set.
  • the difference step 19 the difference between the normalized measurement signals is formed. A large difference indicates that the analog measurement signal does not correctly reflect the actual measurement value.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention concerne un procédé de détection de sorties de signaux de mesure erronées provenant d'un dispositif de terrain (1) consistant : à émettre en sortie une valeur mesurée au moyen du dispositif de terrain (1) en tant que premier signal de mesure, à émettre en sortie la valeur mesurée au moyen du dispositif de terrain (1) en tant que deuxième signal de mesure, à recevoir le premier signal de mesure et le deuxième signal de mesure ou des valeurs dérivées de ces derniers au moyen d'un système de détection (3), à déterminer une différence de signal de mesure entre le premier signal de mesure et le deuxième signal de mesure au moyen du système de détection (3) et à vérifier, au moyen du système de détection (3), s'il existe une situation d'erreur à la lumière de la différence de signal de mesure et éventuellement à la lumière d'au moins un autre état d'erreur. L'invention se rapporte également à un système de détection (3) pouvant être utilisé pour mettre en œuvre le procédé précité. Un autre aspect de l'invention concerne un dispositif de terrain (1) permettant la mise en œuvre du procédé précité.
EP20824178.6A 2020-12-09 2020-12-09 Procédé de détection de sorties de signaux de mesure erronées provenant d'un dispositif de terrain, système de détection et dispositif de terrain Pending EP4260015A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2020/085241 WO2022122147A1 (fr) 2020-12-09 2020-12-09 Procédé de détection de sorties de signaux de mesure erronées provenant d'un dispositif de terrain, système de détection et dispositif de terrain

Publications (1)

Publication Number Publication Date
EP4260015A1 true EP4260015A1 (fr) 2023-10-18

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EP20824178.6A Pending EP4260015A1 (fr) 2020-12-09 2020-12-09 Procédé de détection de sorties de signaux de mesure erronées provenant d'un dispositif de terrain, système de détection et dispositif de terrain

Country Status (4)

Country Link
US (1) US20240035853A1 (fr)
EP (1) EP4260015A1 (fr)
CN (1) CN116529562A (fr)
WO (1) WO2022122147A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7280048B2 (en) 2003-08-07 2007-10-09 Rosemount Inc. Process control loop current verification
US8942219B2 (en) * 2007-04-13 2015-01-27 Hart Communication Foundation Support for network management and device communications in a wireless network
DE102009026785A1 (de) * 2009-01-30 2010-08-05 Endress + Hauser Gmbh + Co. Kg Feldgerät zur Bestimmung und/oder Überwachung einer physikalischen oder chemischen Prozessgröße
DE102009002734A1 (de) * 2009-04-29 2010-11-11 Endress + Hauser Gmbh + Co. Kg Feldgerät zur Bestimmung oder Überwachung einer Prozessgröße in der Prozessautomatisierung
DE102013101579A1 (de) * 2013-02-18 2014-08-21 Endress + Hauser Gmbh + Co. Kg Feldgerät zur Bestimmung oder Überwachung einer Prozessgröße in der Automatisierungstechnik
EP3351905B1 (fr) * 2017-01-19 2020-03-11 Melexis Technologies NV Capteur avec fonction de diagnostic automatique

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WO2022122147A1 (fr) 2022-06-16
US20240035853A1 (en) 2024-02-01

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