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EP0158192B1 - Méthode d'acquisition de données de mesure d'une pluralité de points de mesure - Google Patents

Méthode d'acquisition de données de mesure d'une pluralité de points de mesure Download PDF

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Publication number
EP0158192B1
EP0158192B1 EP85103374A EP85103374A EP0158192B1 EP 0158192 B1 EP0158192 B1 EP 0158192B1 EP 85103374 A EP85103374 A EP 85103374A EP 85103374 A EP85103374 A EP 85103374A EP 0158192 B1 EP0158192 B1 EP 0158192B1
Authority
EP
European Patent Office
Prior art keywords
values
measuring
process according
measured values
value
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.)
Expired - Lifetime
Application number
EP85103374A
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German (de)
English (en)
Other versions
EP0158192A2 (fr
EP0158192A3 (en
Inventor
Heinz Dr. E. H. Dipl.-Ing. Schippers
Gerhard Dr.-Ing. Martens
Karl-Werner Frölich
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.)
Oerlikon Barmag AG
Original Assignee
Barmag AG
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
Priority claimed from DE19843412115 external-priority patent/DE3412115A1/de
Application filed by Barmag AG filed Critical Barmag AG
Publication of EP0158192A2 publication Critical patent/EP0158192A2/fr
Publication of EP0158192A3 publication Critical patent/EP0158192A3/de
Application granted granted Critical
Publication of EP0158192B1 publication Critical patent/EP0158192B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the measurement data which are continuously generated at a large number of measurement points, are recorded and processed by a central data processing system in a multi-digit textile machine.
  • the query speed is increased in that several decentralized data processing devices are provided between the central data processing system and the large number of measuring points. Only a limited number of measuring points are assigned to these decentralized data processing devices.
  • the decentralized data processing devices take over the query (scanner) and the temporary storage of the data.
  • this is a complex solution.
  • this solution increases the query speed and the query frequency.
  • this solution increases the query speed and the query frequency.
  • there remains the disadvantage that only the instantaneous values of the measurement at the time of the query are recorded. As a result, only random values are determined and evaluated that do not allow a reliable statement regarding the process sequence and the product quality achieved.
  • DE 31 42 468 A1 describes an independent, portable data receiving unit equipped with a measuring sensor, which is connected to an evaluation unit alternately for data acquisition with any measuring point and then for data transmission by means of a plug connection to be made for this purpose. During the connection to the measuring point, the continuously occurring measured values are tapped and temporarily stored. A data reduction memory is provided, but there is no sensible selection of the data to be stored and transmitted.
  • the invention solves the problem of ensuring continuous quality monitoring of the process at a large number of measuring points with similar measured values which are queried and processed by a data acquisition system at regular time intervals. For this purpose, only the extreme values of the continuously occurring measured values are determined within each query period and the output signal is the The measuring point is available until it is queried by the central data acquisition system. The signals provided can be deleted after being queried and recorded by the central data processing system. By restricting the query to the extreme values that have occurred over time, it is possible to make a complete statement regarding the quality of the process monitored by the measurement.
  • a further simplification and acceleration of the evaluation of the measurement results can be achieved in that from the outset a certain range of permissible measured values is defined at each measuring point, and error signals are generated when these are exceeded.
  • a preferred embodiment of the invention provides that the mean value of the measurement results is also determined and made available for periodic polling.
  • the mean value of the measurement results alone and together with the extreme values has a very high value for the quality. For this reason, it is preferably provided that the extreme values are determined as the deviation of the peak values of the measured values from the mean value.
  • the mean value can be made available for the periodic query very simply by providing the current measured values that are obtained via a low-pass filter.
  • the output signals are advantageously deleted again by the central data processing.
  • further information about the course of the measured data and the quality of the process can be obtained by evaluating the measured data of several successive query periods.
  • the length of the query periods can be selected to be very short, since the measurement data are already available in digital form. By shortening the query periods, extreme monitoring and evaluation is practically equivalent to continuous monitoring and evaluation. Nevertheless, the scanning (scanning) frequency can lag behind that which was necessary according to the previous methods of complete measurement data acquisition.
  • Fig. 1 shows a measurement record of a measured value without gaps, e.g. the thread tension of a running thread 1 in a textile machine. A part of such a textile machine is shown in Fig. 3.
  • Fig. 3 four identical processing points of a multi-digit textile machine with the threads 1 are shown schematically.
  • Each thread 1 is conveyed into a stretching zone by godet 2, guided therein via a heater 3 and drawn off again by godet 4.
  • 5 denotes a thread tension (thread tension) meter.
  • each thread is wound into a bobbin 7 by means of the drive roller 6.
  • Each transducer 5 consists of the sensor 8 and a comparator circuit 9, which is shown in detail in Fig. 4. More on this later.
  • the measured value of the thread tension shown in FIG. 1 will be kept within certain limits without disturbing the process. Ideally, the measured value would be constant. Fluctuations and, in particular, also short-term fluctuations occur.
  • a certain range of measured values that occur at all or that are to be recorded at all are initially defined. This bandwidth is shown in Fig. 1 by dashed lines. This range of measured values is defined in the application as a measuring range.
  • this measuring range is divided into measuring stages I, II, III ... VIII, which are each of the same size.
  • a defined digital output signal AI to AVIII is assigned to each measuring range I to VIII.
  • An output signal AI to A VIII is called when and as soon as the current measured value passes through the corresponding measuring stage.
  • the output signals AI to A VIII insofar as they have been called up, are stored.
  • the called output signals are therefore always available for interrogation. All output signals are in the time interval T1 A II to A VIII incurred. These output signals are stored and are therefore available for interrogation at query time ST1. From this it can be seen that very large fluctuations in measured values occurred in the query period.
  • the fluctuation range is even greater in the query period T2, while in the query period T3 there was a much smaller fluctuation.
  • the values stored in a period T1, T2, T3, ... can now be called up by a central computer at time ST1, ST2 and then deleted. It is accepted that there is no gapless acquisition of the measured value curve. However, the extreme values can be recorded without gaps in time. In particular, by reducing the query times T1, T2, T3, ..., an extensive breakdown of the course of the measured values, for example, periodic fluctuations in measured values, temporal course of the measured value scatter, temporal trend of extreme values, etc., can take place.
  • the query times T1, T2, T3 are considerably longer than the query times that are necessary in the previously practiced methods in order to be able to detect the extreme values of the analogue measurement value with sufficient reliability.
  • a comparator circuit (FIG. 4) is provided as particularly advantageous for dividing the measuring range into measuring stages. Each measurement value is assigned to a defined step sequence of comparison values and one to the respective measurement step assigned output signal is generated when the measured value and the respective stage of the comparison signal meet the comparison criterion, for example, are the same.
  • Each comparator circuit consists of eight comparators 10, which are connected with their one input 11 to resistors 12 connected in series. The second input 13 is acted upon by the output signal of the sensor 8.
  • the comparators are designed so that they emit an output signal A I to A VIII as soon as the value at input 13 reaches the voltage value at input 11. If each resistor 12 is dimensioned such that it represents a measuring stage, each output signal A I to A VIII corresponds to a measuring stage I to VIII.
  • the circuit can also be selected so that the measuring stages overlap slightly.
  • for. B. can be prevented by interlocking the measuring stages that the signals of both measuring stages are stored for a measured value that is in the overlap area of two stages. In any case, only the highest value is saved.
  • the comparators are connected to a switching logic, not shown in detail, by means of which the output signals A I to A VII are deleted as soon as the next higher signal is called.
  • each comparator circuit is connected to a memory device 14 in which the respective output value AI to A VIII is stored.
  • the output signals AI to A VIII are present, insofar as they were called up in a query period, and are fed to a parallel / series converter 15.
  • the function of the parallel / series converter is to convert the signals AI to A VIII, which are present in parallel and simultaneously, into a pulse train, which can be fed to the computer 17 via a single line 16.
  • the query times are specified by the computer 17 (FIG. 3).
  • the computer outputs a coded signal chain, possibly for addressing, via line 19 via a connected parallel / series converter 18, through which one of the memories 14 is addressed and the stored output signals A I to A VIII of a measuring point are queried.
  • the computer After data has been retrieved via line 16, the computer outputs an erase signal coded to the individual memory via line 19, so that the stored output signals of this measuring point are erased and released for the following query period.
  • the abscissa is a common time axis for all diagrams. Some query periods are labeled S1-S4 on the time axis.
  • the ordinate of diagram I shows an example of a possible course of the measuring voltage U of a sensor. The measuring voltage represents the current continuously recorded measured values.
  • Diagram II shows the mean U average of the measuring voltage on the ordinate. According to the invention, this mean value is generated by passing the measured value over a low-pass filter.
  • Diagram III shows the formation, provision and query of the maximum value U max in its chronological course.
  • Diagram IV shows in the same way the time course, the formation, provision and query of the minimum value U min of the measuring voltage.
  • the measuring voltage is related to a reference voltage in diagrams II and IV.
  • the voltage zero or the mean value are particularly suitable for this.
  • Extreme value formation and provision is discussed in more detail below:
  • the measuring voltage is initially essentially constant in a period a and is equal to the mean value.
  • the extreme values U max and U min therefore also correspond to the mean value in this period.
  • there is a sudden and brief increase in the measuring voltage U as shown in diagram I. Because of the short-term nature of this extreme value, this fluctuation has no influence on the mean value.
  • the maximum value U max follows the increase in the measured value up to the extreme value and then assumes this extreme value. As shown in diagram III, this extreme value then remains during the query period S3 and is queried by the central data acquisition system at the end of the query period and then deleted again, so that the value held ready at the measuring point falls back to the reference value.
  • the minimum value storage U min also follows this negative deviation of the current measured value U from the mean value, the lowest value being stored in each case and being available for querying at the end of the query period S3.
  • the values of the mean value representing the course of the query period as well as the maximum positive and negative deviations therefrom are available for query and evaluation by the central data acquisition system.
  • the absolute extreme values can be provided in addition to the mean value.
  • the thread tension in a textile machine with a large number of processing points for each thread to be processed can be continuously determined, provided in each query period as maximum, minimum and average value, from the central data acquisition system via a scanner from processing point to processing point polled at intervals and evaluated for a quality statement.
  • error alarm signals can be generated.
  • a certain bandwidth is specified for the average thread tension, represented by the output voltage U medium . If the currently determined mean value leaves this range of permissible thread tensions, an error alarm signal is given and, for example, the processing point concerned is stopped or an error is signaled for this processing point.
  • a certain bandwidth is specified for the maximum value as a deviation from the mean value and likewise for the minimum value as a deviation from the mean value. These bandwidths can vary in size.
  • FIG. 6 shows a basic circuit diagram for providing the analog extreme values and the analog mean value at each measuring point.
  • the measured value for example - as in FIG. 3 - the thread tension of a measuring point is continuously detected by the sensor 5.
  • a memory is designated, which is assigned to each measuring point.
  • the measured values are amplified in the memory and processed to the maximum value U max , the mean value U mean and the minimum value U min and kept ready for interrogation.
  • the memory 14 initially has an amplifier 20 for amplifying the measurement signal.
  • the maximum value is then formed in a peak value meter 21 as a deviation from the mean value and in the inverted peak value meter 22 the minimum value is formed as a deviation from the mean value.
  • 23 shows a low-pass filter for generating the mean value.
  • the maximum value of the measured values per query period, the running mean value and the minimum value of the measured values per query period are provided at the output of the memory. These values are given to a switching device, a so-called "scanner" 31. Its function is to feed the signals, which are present in parallel and simultaneously, in succession to the computer 17 via an analog-digital converter 32 (A / D converter) and line 16. As already described, the query times are specified by the computer 17. At each time of the query, the computer outputs a coded signal chain for addressing via line 19, through which a measuring point with its memory 14 is addressed and the stored output signals are queried. After data has been retrieved via line 16, the computer outputs a delete signal encoded on the individual memory via line 19, so that the stored maximum or minimum values are deleted. The mean remains. Furthermore, a fault alarm signal device 24 can also be addressed via line 19.
  • the peak value meters and low-pass filters used for this circuit are known.
  • the peak value meters are explained again using the simplified circuit diagram according to FIG. 7.
  • the peak value meter for determining the maximum value has in particular the diode 25 and the capacitor 26.
  • the capacitor is at a potential of 0 V.
  • a voltage of 0 to 10 V is permitted for the measured value U. Since the diode 25 blocks a current direction, the capacitor 26 is charged up to the maximum value which is reached in the query time, so that this maximum value is stored and remains as the output signal of the query period.
  • Switch 27 is controlled via line 19 if the maximum value U max can be deleted after the query.
  • the inverted peak generator 22 has the diode 28 and the capacitor 29. However, the flow direction of the diode 28 is reversed.
  • the capacitor on the other hand, is at a voltage of 15 V, which is higher than the highest occurring measuring voltage, which was previously given as 10 V. This means that any reduction in the measured value on the capacitor 29 appears as an increased and permanent voltage gradient, which remains at the output of the memory as the minimum value U min . 30 again designates a switch by which the capacitor is short-circuited and an erase signal can thus be given via line 19.
  • the low-pass filter 23 consists essentially of resistors and capacitors that are known.
  • the circuit of FIG. 7 differs from the description of FIG. 6 and the flow chart shown in FIG. 6 in that the extreme values are represented here by their absolute values.
  • the extreme values are represented here by their absolute values.
  • processing the measured values in the memory 14 in such a way that the extreme values represent the difference between the measured extreme values and their mean value.
  • an element can be connected between point 38 and voltage follower 33 and between point 38 and voltage follower 34, which element determines the difference between the current measured value and the mean value U mean .
  • Such a differential amplifier is indicated at 39 in FIG. 8.
  • the voltage followers 35 and 36 in FIG. 7 can be replaced by a differential amplifier which is connected to the output of the differential amplifier 37 and processes the extreme values U max and U min so that they represent the difference between the absolute extreme values and the mean value .

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Claims (12)

  1. Procédé de saisie centrale des valeurs de mesure qui parviennent au fur et à mesure d'une pluralité de points de mesure, qui sont connectés en vue de la transmission et de l'exploitation des valeurs de mesure de façon séquentielle et à intervalles de temps réguliers, au moyen d'une installation centrale de saisie de données et/ou de traitement de données,
    caractérisé par le fait qu'
    à chaque point de mesure les valeurs minimum et les valeurs maximum des valeurs de mesure produites au fur et à mesure sont établies pour chaque intervalle de temps et sont dans chaque cas mises en mémoire en tant que signal de sortie,
    et que les signaux de sortie mis en mémoire sont lus et saisis par l'installation centrale de traitement de données.
  2. Procédé selon la revendication 1,
    caractérisé par le fait que
    les signaux de sortie mis en mémoire sont effacés après avoir été lus et saisis par l'installation centrale de traitement de données.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé par le fait que
    l'on choisit comme domaine de mesure une plage de valeurs de mesure d'étendue limitée, à partir des valeurs de mesure produites ou à partir du domaine de saisie de l'émetteur de données de mesure.
  4. Procédé selon la revendication 3,
    caractérisé par le fait que
    le dépassement du domaine de mesure choisi est signalé en tant que défaut.
  5. Procédé selon une des revendications précédentes,
    caractérisé par le fait qu'
    une valeur moyenne est établie au fur et à mesure à partir des données de mesure, qu'elle est mise en mémoire et lue.
  6. Procédé selon la revendication 5,
    caractérisé par le fait que
    les valeurs extrêmes sont établies par comparaison avec la valeur moyenne et que de préférence un signal de défaut est émis lorsque les valeurs extrêmes établies de cette manière dépassent un écart prédéterminé considéré comme étant l'écart maximum autorisé.
  7. Procédé selon la revendication 5,
    caractérisé par le fait que
    les valeurs extrêmes apparaissant au cours d'un intervalle de temps de lecture sont enregistrées en tant que le plus grand écart des valeurs de mesure par rapport à la valeur moyenne, stockées ainsi que lues.
  8. Procédé selon une des revendications 5 à 7,
    caractérisé par le fait que
    la valeur moyenne est établie en continu à partir des données réellement mesurées et cela indépendamment des intervalles de temps de lecture.
  9. Procédé selon la revendication 8,
    caractérisé par le fait que
    la valeur moyenne est établie en faisant passer par un filtre passe-bas les valeurs de mesure réelles au fur et à mesure qu'elles se présentent.
  10. Procédé selon une des revendications 1 à 9,
    caractérisé par le fait que
    les valeurs extrêmes sont établies par la mesure de la valeur maximale des valeurs de mesure réelles.
  11. Procédé selon une des revendications précédentes,
    caractérisé par le fait que
    le domaine de mesure de chaque point de mesure est subdivisé en étages de mesure (I à VIII),
    qu'à chaque point de mesure, pour les étages de mesure qui sont atteints ou dépassés par les valeurs de mesure d'un point de mesure, un signal de sortie (AI à AVII) est produit, mis en mémoire et maintenu prêt pour la lecture.
  12. Procédé selon la revendication 11,
    caractérisé par le fait que
    des valeurs de références augmentant par degrés sont introduites dans chaque cas dans un comparateur et y sont comparées avec la valeur de mesure,
    et que le comparateur considéré délivre un signal de sortie lorsque la valeur de mesure atteint au moins approximativement la valeur de référence ou la dépasse.
EP85103374A 1984-03-31 1985-03-22 Méthode d'acquisition de données de mesure d'une pluralité de points de mesure Expired - Lifetime EP0158192B1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE19843412115 DE3412115A1 (de) 1984-03-31 1984-03-31 Verfahren zur zentralen erfassung von messwerten einer vielzahl von messstellen
DE3412115 1984-03-31
DE3420163 1984-05-30
DE3420163 1984-05-30
DE3430223 1984-08-17
DE3430223 1984-08-17
DE3507178 1985-03-01
DE3507178 1985-03-01

Publications (3)

Publication Number Publication Date
EP0158192A2 EP0158192A2 (fr) 1985-10-16
EP0158192A3 EP0158192A3 (en) 1986-10-22
EP0158192B1 true EP0158192B1 (fr) 1991-06-05

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EP85103374A Expired - Lifetime EP0158192B1 (fr) 1984-03-31 1985-03-22 Méthode d'acquisition de données de mesure d'une pluralité de points de mesure

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US (1) US4720806A (fr)
EP (1) EP0158192B1 (fr)
DE (1) DE3583057D1 (fr)

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EP0158192A2 (fr) 1985-10-16
EP0158192A3 (en) 1986-10-22
DE3583057D1 (de) 1991-07-11
US4720806A (en) 1988-01-19

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