EP1495375A2 - Dispositif de mesure pour processus industriels et mode de fonctionnement d'un dispositif de mesure - Google Patents

Dispositif de mesure pour processus industriels et mode de fonctionnement d'un dispositif de mesure

Info

Publication number
EP1495375A2
EP1495375A2 EP03746291A EP03746291A EP1495375A2 EP 1495375 A2 EP1495375 A2 EP 1495375A2 EP 03746291 A EP03746291 A EP 03746291A EP 03746291 A EP03746291 A EP 03746291A EP 1495375 A2 EP1495375 A2 EP 1495375A2
Authority
EP
European Patent Office
Prior art keywords
measuring
central unit
module
selection
modules
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.)
Ceased
Application number
EP03746291A
Other languages
German (de)
English (en)
Inventor
Michael Gunzert
Martin Gehrke
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 Conducta GmbH and Co KG
Original Assignee
Endress and Hauser Conducta Gesellschaft fuer Mess und Regeltechnik mbH and Co KG
Endress and Hauser Conducta GmbH 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 Conducta Gesellschaft fuer Mess und Regeltechnik mbH and Co KG, Endress and Hauser Conducta GmbH and Co KG filed Critical Endress and Hauser Conducta Gesellschaft fuer Mess und Regeltechnik mbH and Co KG
Publication of EP1495375A2 publication Critical patent/EP1495375A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
    • G01N35/00584—Control arrangements for automatic analysers
    • G01N35/00722—Communications; Identification
    • G01N35/00871—Communications between instruments or with remote terminals
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/054—Input/output
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
    • G01N2035/00178—Special arrangements of analysers
    • G01N2035/00326—Analysers with modular structure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/11—Plc I-O input output
    • G05B2219/1127—Selector for I-O, multiplex for I-O
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/21—Pc I-O input output
    • G05B2219/21034—Address I-O

Definitions

  • Measuring device for process technology and operating procedures for a measuring device
  • the present invention relates to a measuring device for process technology: for use in measuring and / or cleaning and / or calibration systems in the field of process automation for measuring pH values and / or redox potentials and / or other process variables with a central unit, at least one measuring module with the central unit is connectable.
  • the present invention also relates to an operating method for a measuring device for process technology; for use in measuring and / or cleaning and / or calibration systems in the field of process automation, for measuring pH values and / or redox potentials and / or other process variables with a central unit.
  • Measuring devices of the type mentioned at the outset often offer an expansion option in the form of measuring modules, which e.g. are equipped with various sensors and can also be subsequently integrated into or connected to the central unit.
  • Known measuring modules have complex means of communication such as e.g. for communication with the measuring device.
  • special interface controllers which are correspondingly expensive, or a calculation unit of the measurement module itself has to carry out the communication with the central unit, with fewer resources being available for measurement data acquisition.
  • the object of the present invention is to provide an improved measuring device and an improved operating method for a measuring device in which the measuring module be able to communicate flexibly with the central unit and have to have little self-intelligence to participate in data communication with the central unit.
  • each measuring module can be selected by the central unit through a selection line assigned to it.
  • the respective measuring module is signaled by the central unit that it has been selected by the central unit for communication or for data transmission.
  • the use of the signaling according to the invention via the selection line assigned to the measuring module makes it possible to dispense with complicated evaluation electronics in the measuring module.
  • the electronics of the measuring module only have to monitor a logical state of the selection line assigned to it.
  • the central unit has a module housing, into which the measuring modules can be integrated, for example, by inserting them into slots provided for this purpose, it is possible to assign a selection line to the central unit for each slot.
  • the selection line is connected to the measuring module when the measuring module is inserted into the slot of the central unit.
  • An advantageous embodiment of the present invention is characterized in that all measuring modules can be connected to the central unit via a central transmission line.
  • a signal transmitted from the central unit via the central transmission line reaches all measuring modules which are connected to the central unit at the same time.
  • the measuring module selected by the central unit through the selection line assigned to it evaluates that from the central unit via the central transmission line transmitted signal off; the other measuring modules are not selected and therefore do not evaluate the signal transmitted by the central unit via the central transmission line.
  • each measuring module has a module transmission line.
  • a measuring module selected by the central unit via the respective selection line can transmit data to the central unit via this module transmission line.
  • each module transmission line of a measuring module connected to the central unit be connected to a separate data input of the central unit.
  • a further embodiment of the present invention is very advantageous, in which the module transmission lines of the measuring modules can be connected to the inputs of a multiplexer, in which the output of the multiplexer can be connected to the central unit, and in which the multiplexer can be controlled via the selection lines.
  • the central unit selects several measuring modules simultaneously by means of the respective selection lines, so that these several measuring modules are simultaneously selected by the central unit can receive and evaluate the signal sent on the central transmission line.
  • the central unit selects several measuring modules simultaneously by means of the respective selection lines, so that these several measuring modules are simultaneously selected by the central unit can receive and evaluate the signal sent on the central transmission line.
  • the multiplexer in such a way that none of the inputs connected to the module transmission lines of the measuring modules is forwarded to the output of the multiplexer and thus to the central unit as soon as more than one selection line is activated.
  • the simultaneous selection of several measurement modules can e.g. are used to simultaneously send initialization messages when the central unit starts up with a kind of broadcast to all measuring modules connected to the central transmission line that do not require confirmation of the measuring modules. Furthermore, a message can be transmitted to all measuring modules in this way, which signals an error in the central unit or the like.
  • a further advantageous embodiment of the operating method according to the invention provides that a multiplexer is controlled by the selection lines in such a way that data sent via a module transmission line of the selected measuring module is forwarded to the central unit via the multiplexer.
  • data sent by the central unit to everyone is provided via a central transmission line Send measuring modules.
  • a further variant of the operating method according to the invention is particularly advantageous, in which data sent by the central unit is evaluated only in the measuring module selected by means of the selection line.
  • Another embodiment of the operating method according to the invention provides that the measuring modules are selected periodically by the central unit for communication / data transmission. This ensures that any data generated in the measuring modules, such as Measurement data from sensors or calculation results or the like can be called up and evaluated regularly by the central unit.
  • the periodic selection of the measuring modules by the central unit for a certain selection time can expediently be represented by time slices, the size of which corresponds to the duration of the selection time per measuring module. These time slices are assigned to the individual measuring modules by the central unit.
  • the size of the time slices therefore determines the time period for which a measuring module is selected by the central unit and can communicate with the central unit before the central unit selects a next measuring module for communication.
  • the measuring modules according to a further embodiment of the operating method according to the invention aperiodically from the central unit to be selected.
  • the aperiodic selection of measurement modules makes it possible to reduce the inherent latency that results from the fact that between the selection of a first measurement module and the renewed selection of this first measurement module, other measurement modules are selected.
  • the remaining free time within the cycle can be used to select any measurement modules aperiodically. This is particularly advantageous when data has to be transmitted to and / or read from a measuring module with minimal delay, for example due to sporadic events.
  • the duration of the selection times ie the size of the time slices assigned to the measuring modules.
  • this makes it possible to change the prioritization of the data communication during the operation of the central unit and to dynamically adapt to changing requirements.
  • a measuring module which is inactive for most of the time, can transmit very large amounts of data to the central unit when it is active must transfer these amounts of data quickly if necessary to the central unit without stressing the communication between the central unit and the other measuring modules while it is inactive.
  • a further advantage here is that the measuring module does not have to have its own large data memory, since, as already described, it can quickly transmit determined data to the central unit if necessary.
  • Another way of prioritizing the communication between the measuring modules and the central unit is to select individual measuring modules several times within a cycle, i.e. to assign several time slices within a cycle to these measuring modules.
  • several time slices - also of different sizes - can also be assigned to a measuring module as part of periodic communication.
  • a measuring system with a measuring device according to one of claims 1 to 4 is specified, which has at least one measuring module.
  • a measuring module such as, for example, a calculation unit or another device that extends the functionality of the central unit.
  • the calculation unit communicates with the central unit in the manner described above and does not necessarily have to serve for the measurement data acquisition or its functionality is limited to the measurement data acquisition.
  • Figure 1 shows a measuring device according to the invention
  • Figure 2 shows schematically the division of a communication cycle into different selection times.
  • the measuring device in FIG. 1 has a central unit 1, to which several measuring modules 2 are assigned.
  • All measuring modules 2 are connected to the central unit 1 via a central transmission line 4 shown in dashed lines in FIG.
  • the central transmission line 4 is used to transmit a signal or data from the central unit 1 to the measuring modules 2. All measuring modules 2 simultaneously receive the data transmitted by the central unit 1 via the central transmission line 4.
  • Each measuring module 2 is also assigned its own selection line 3, which connects the measuring module 2 to the central unit 1.
  • the selection line 3 serves to select one of the measurement modules 2 by the central unit 1 for communication / data transmission.
  • a module transmission line 5 is assigned to each measuring module 2.
  • the module transmission lines 5 of the measuring modules 2 are connected to the inputs 6a of a multiplexer 6.
  • the output 6b of the multiplexer 6 is connected to the central unit 1.
  • the multiplexer 6 is used to select one of the module transmission lines 5 of the measuring modules 2 and to connect this to the central unit 1 via the output 6b of the multiplexer 6. The control of the multiplexer 6 to select the
  • Module transmission line 5 takes place via the selection lines 3, which, as can be seen from FIG. 1, also act on the multiplexer 6.
  • a selection module 3 is therefore selected by the central unit 1 for communication, on the one hand, and the multiplexer 6 is controlled via the selection lines 3 by the selection lines 3.
  • module transmission line 5 from the inputs 6a of the multiplexer 6 via the output 6b of the multiplexer 6 to the central unit 1, which corresponds to the measuring module 2 selected by means of selection lines 3.
  • the multiplexer 6 in such a way that none of the inputs 6a connected to the module transmission lines 5 of the measuring modules 2 have an output 6b of the multiplexer 6 and thus forwarded to the central unit 1 as soon as more than one selection line 3 is activated.
  • measuring module 2 can communicate via its module transmission line 5 with the central unit 1 which the central unit 1 has selected for this purpose via the selection lines 3.
  • a time control for communication with the measurement modules 2 is provided on the part of the central unit 1.
  • the time control provides that all measuring modules 2 connected to the central unit 1 are selected one after the other by the central unit 1 via the selection line 3 assigned to them.
  • the selection of a specific measurement module 2 is maintained by the central unit 1 for a specific selection time Ta.
  • the selected measuring module 2 is able to exchange data with the central unit 1.
  • the data exchange can be carried out at different data rates.
  • the new measuring module 2 In order to identify a measuring module 2 newly arranged in the measuring device, it is also possible to query the new measuring module 2 successively at different data rates for an identification pattern. As soon as the central unit 1 receives a valid identification pattern from the new measuring module 2, the information associated therewith is made new Measurement module 2 saved and used for further communication with it. The selection time Ta is then communicated to the new measuring module 2. This enables the integration of measuring modules 2 in a measuring device according to the invention, without the measuring modules 2 having to be set specifically to the communication parameters used in the measuring device, such as the selection time Ta.
  • a next measuring module 2 is selected by the central unit 1 via the selection lines 3. This selection is also maintained for the selection time Ta.
  • Different selection times Ta, Tb, Tc can also be assigned to the individual measuring modules in order to prioritize the communication.
  • the selection times Ta, Tb, Tc assigned to the individual measuring modules 2 can also be understood as time slices, the size of which is proportional to the duration of the respective selection time Ta, Tb, Tc, and are shown graphically in the form of a pie chart in FIG. 2.
  • the selection times Ta, Tb and Tc are assigned to three different measuring modules 2 (FIG. 1) and indicate that these three measuring modules 2 are selected periodically, namely once in each communication cycle, by the central unit 1.
  • This sequence of selection results when the pie chart of FIG. 2 is run through in a mathematically negative sense, the communication cycle starting with the selection time Ta.
  • the selection time Tx also shown in FIG. 2, which results as the time difference between the sum of the selection times Ta, Tb, Tc and the cycle time Ta + Tb + Tc + Tx of the communication cycle, corresponds to a free time slice and is used by the central unit 1, for example used to select individual measuring modules 2 aperiodically.
  • the communication between the central unit 1 and the measurement modules 2 can be prioritized by changing the size of the time slices.
  • the selection time Tc is longer than the selection time Tb.
  • a measuring module 2 which contains a spectrometer and, in comparison to a temperature sensor, has to transmit a relatively large amount of data per communication cycle to the central unit 1, can receive four time slices with the selection time Ta within a communication cycle, while a measuring module with a temperature sensor, which is only very different evaluates slowly changing temperature, only receives a time slice with the selection time Ta.
  • a further advantage here is that the measuring module 2 does not have to have its own large data memory, since it can - as already described - ascertained data quickly transferred to the central unit 1 if necessary and does not have to store it itself for a long time.
  • a further conceivable embodiment of the invention relates to a measuring system with a measuring device, which has at least one measuring module 2.
  • each measuring module 2 and the multiplexer 6 instead of the central transmission line 4 and the respective module transmission line 5 for each measuring module 2.
  • the output 6b of the multiplexer 6 is also connected to the central unit 1 by a bidirectional communication link.
  • the multiplexer 6 is driven by the selection lines 3, whereby one of the measuring modules 2 is selected.
  • an explicit selection of the measuring module 2 is not necessary, as in the examples given so far, so that the selection lines 3 only connect the central unit 1 to the multiplexer 6 and do not have to act on each measuring module 2.
  • control commands to the data transmission between the central unit 1 and a measuring module 2
  • a measuring module 2 To send multiplexer 6, which are evaluated in the multiplexer 6 and cause the selection of a measuring module 2.
  • the selection lines 3 can be omitted entirely.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

L'invention concerne un dispositif de mesure pour processus industriels, destiné à des installations de mesure et/ou de nettoyage et/ou de calibrage dans le domaine de l'automatisation des processus appliquée à la mesure du pH et/ou des potentiels redox et/ou d'autres grandeurs de processus. Le dispositif de mesure selon l'invention comporte une unité centrale (1) à laquelle est relié au moins un module de mesure (2). L'invention est caractérisée en ce que chaque module de mesure (2) peut être sélectionné à partir de l'unité centrale (1) au moyen d'une ligne de sélection (3) qui lui est attribuée.
EP03746291A 2002-04-13 2003-04-11 Dispositif de mesure pour processus industriels et mode de fonctionnement d'un dispositif de mesure Ceased EP1495375A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10216332 2002-04-13
DE10216332A DE10216332A1 (de) 2002-04-13 2002-04-13 Messeinrichtung für die Prozesstechnik und Betriebsverfahren für eine Messeinrichtung
PCT/EP2003/003761 WO2003087963A2 (fr) 2002-04-13 2003-04-11 Dispositif de mesure pour processus industriels et mode de fonctionnement d'un dispositif de mesure

Publications (1)

Publication Number Publication Date
EP1495375A2 true EP1495375A2 (fr) 2005-01-12

Family

ID=28685005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03746291A Ceased EP1495375A2 (fr) 2002-04-13 2003-04-11 Dispositif de mesure pour processus industriels et mode de fonctionnement d'un dispositif de mesure

Country Status (6)

Country Link
US (1) US7761243B2 (fr)
EP (1) EP1495375A2 (fr)
CN (1) CN100533313C (fr)
AU (1) AU2003226801A1 (fr)
DE (1) DE10216332A1 (fr)
WO (1) WO2003087963A2 (fr)

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US20140295356A1 (en) * 2013-03-29 2014-10-02 Rosemount Analytical, Inc. In situ flue gas analyzer with improved process communication

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Also Published As

Publication number Publication date
WO2003087963A2 (fr) 2003-10-23
DE10216332A1 (de) 2003-10-30
CN100533313C (zh) 2009-08-26
AU2003226801A8 (en) 2003-10-27
CN1647002A (zh) 2005-07-27
US7761243B2 (en) 2010-07-20
AU2003226801A1 (en) 2003-10-27
US20050216230A1 (en) 2005-09-29
WO2003087963A3 (fr) 2004-08-05

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