EP0387191B1 - Méthode pour connecter un dispositif de commande programmable avec des éléments d'opération et/ou d'affichage et circuit pour un dispositif de commande programmable - Google Patents

Méthode pour connecter un dispositif de commande programmable avec des éléments d'opération et/ou d'affichage et circuit pour un dispositif de commande programmable Download PDF

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Publication number
EP0387191B1
EP0387191B1 EP90810141A EP90810141A EP0387191B1 EP 0387191 B1 EP0387191 B1 EP 0387191B1 EP 90810141 A EP90810141 A EP 90810141A EP 90810141 A EP90810141 A EP 90810141A EP 0387191 B1 EP0387191 B1 EP 0387191B1
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EP
European Patent Office
Prior art keywords
operating
shift register
parallel
register
inputs
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
EP90810141A
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German (de)
English (en)
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EP0387191A1 (fr
Inventor
Werner Kruse
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.)
Weidmueller Interface GmbH and Co KG
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Weidmueller Interface GmbH and Co KG
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Publication of EP0387191A1 publication Critical patent/EP0387191A1/fr
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
    • G08C15/06—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division
    • G08C15/12—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division the signals being represented by pulse characteristics in transmission link

Definitions

  • connection lines of these field devices are usually brought together in control cabinets at a central point in the building and are fed there by corresponding control devices, which can also be part of a control loop.
  • the control of the field devices according to the respective control output of a control device is usually done conventionally via relays, contactor relays and coupling relays.
  • At least one operating device such as a control panel
  • a plurality of operating elements such as switches.
  • a plurality of display elements is generally required, with which the switching status of field devices, parameters of the control device and other information can be displayed.
  • the operating elements control switch, pushbutton
  • the display elements signal lights
  • PLC programmable logic controllers
  • the object of the invention is to avoid the disadvantages of the known, in particular to create a method and a circuit arrangement for a programmable control device, by means of which the functional connection of the control device (PLC) and operating device or display elements can be produced.
  • PLC control device
  • the invention therefore selects a method or a circuit arrangement in which the status of the operating elements is queried cyclically and the information obtained is cyclically can be read into a shift register in signal groups. After the completion of such a cycle, the state of each individual memory of the shift register corresponds to the state of the associated control element, so that after reading in in a second cycle, the signals can be transferred in parallel from the individual memories into a result register with a corresponding number of memory locations.
  • the outputs of the memory locations of the result register are on the input side at the parallel control inputs of the programmable control device, so that there is a constant signal at each input which corresponds to the state of an assigned operating element.
  • Shift registers and result registers can be designed as additional devices for conventional PLCs and connected to their parallel inputs. Alternatively, it is of course also possible to convert the signals yourself in a suitably designed PLC.
  • the invention provides for the output signals of the PLC for the display elements to be serially transmitted and converted into corresponding registers.
  • a clock must be provided for the transmission and reading in of the signals, a clock line being provided for synchronizing the transmission between the display device or operating device and the PLC. It is expedient if the operating and display device has separate memories for the operating elements and the display elements.
  • a programmable logic control device 2 is provided in a control cabinet 1 (not shown).
  • the PLC controls a number of power contactors 4 in a known manner, which are connected via a terminal strip 5 to consumers, not shown, such as ventilation motors, lighting devices and the like.
  • Motor protection switches 3 are provided as protective devices for motors.
  • Fuses 6 are provided to protect the various circuits.
  • the PLC 5 controls the various consumer or field devices 7 connected to the terminal strip 5 in a programmable manner.
  • the PLC On the input side, the PLC is connected to a combined operating and display device 9 via a connecting line 8 (data bus).
  • the operating and display device 9 is arranged in the door 10 of a control cabinet, as is indicated schematically in FIG. 1.
  • a remote control panel 9a can be provided.
  • the operating and display device 9 consists of a plurality of operating devices 9a and display devices 9b.
  • each of the operating devices 9a has 8 illuminated pushbuttons 11 as operating elements.
  • a specific function of the PLC 2 or a function of one of the field devices 7 can be assigned to each of the illuminated pushbuttons 11.
  • the number of illuminated pushbuttons 11 per operating device 9a and the number of illuminated indicators 12 per display device (9b) depends on the complexity of the system and the functions that the PLC 2 is to perform. Any other switching elements can of course be used instead of the illuminated pushbuttons 11.
  • each of the display devices 9b has sixteen indicator lights 12 as display elements.
  • the indicator lights 12 can each be assigned to a specific operating state of the PLC or the field devices 7.
  • the control devices 9a and the display devices 9b are connected by means of a bus board (not shown) to a system card 13 which has an interface 14 for connecting the line 8.
  • Line 8 has eight cores, one of the cores being a clock line with which the clock frequency of the PLC is synchronized with the clock frequency of the operating and display device.
  • each sixty-four illuminated pushbuttons 11 are connected to an arrangement 15, in which signals are stored which correspond to the respective position of one of the illuminated pushbuttons 11.
  • the input shift register 16 is fed with data via an input 17.
  • the input shift register 16 has sixty-four memory locations C1 through C64.
  • the data applied via the input 17 are "shifted" into the shift register 16 in time with the clock line E0 until a data group of sixty-four items of information - corresponding to the switching positions of the sixty-four illuminated pushbuttons 11 - is in the shift register 16.
  • the data line 8a is an additional line to the wires labeled E0 to E5, which connect the interface 14 to the PLC 2 (FIG. 2).
  • each of the wires can connect an arrangement 15 to an input shift register 16, so that the information from sixty-four operating elements is read into the memory locations of an input shift register 16 via a data line.
  • the lines E1 to E5 are also connected to an evaluation logic 18, which is also connected to the clock line E0.
  • the evaluation logic 18 determines the start and the end of the transmission of data groups on the line 8a. As soon as all sixty-four information items have been read into the input shift register 16, the evaluation logic 18 determines the end of a transmission cycle.
  • the input 20 of a result register 21 is driven via a control line 19, which now takes over the information pending at the storage locations C1 to C64 of the input shift register 16 in parallel via parallel connecting lines 22.
  • the information which corresponds to the switch positions of the illuminated pushbuttons 11 remains in the result register 21. They are connected to the input of the PLC 2 via output lines 23.
  • the number of memory locations in the input shift register 16 can be increased or decreased depending on the requirement profile of the overall arrangement, and the number of data lines can also be adapted to the requirements of a system.
  • the query of the illuminated pushbuttons 11, the temporary storage of the information and the reading out into the data line 8a is controlled in a known manner by a microprocessor and requires no further explanation. It is only important that the arrangement 15 and the input shift register 16 or the result register 21 are synchronized via the clock line E0 in such a way that a correct assignment of the data to the individual illuminated pushbutton 11 and a corresponding "storage" in one of the memory locations of the input shift register 16 are guaranteed.
  • FIG. 4 shows an output shift register 24, which is located at the outputs of the PLC 2, which control the indicator lights 12.
  • each of the output lines 25 is connected to one of the indicator lights 12, while in the present case the output lines 25 are located at the inputs of the memory locations of the shift register 24.
  • the output shift register 24 is driven by a control circuit (not shown) via a clock line E0 and a control line 26.
  • the output shift register 24 is polled, and the signals present on the lines 25 are converted into serial data groups which are passed via a data line 8b to an arrangement 27 in which the incoming ones Data are assigned to the individual indicator lights 12 and stored.
  • the transmission with short cycle times ensures that the switching state of the indicator lights 12 corresponds practically without delay to the signals output by the PLC to the output lines 25.
  • the conversion of the signals arriving in series via the data line 8b into signals available in parallel for the control of the indicator lights 12 is preferably carried out in the arrangement 27 analogously to the functioning of the input shift register 16 and result register 21.
  • the elements required for the data conversion namely the evaluation logic 18, input shift register 16, result register 21 and output shift register 24, are combined in a schematically indicated input part 2a, which is part of the PLC 2.
  • input part 2a which is part of the PLC 2.
  • the input part 2a it is also conceivable to design the input part 2a as an independent device with its own power supply, etc. and to establish a connection by means of the output lines 23 and 25 to the corresponding outputs of a conventional PLC.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Programmable Controllers (AREA)

Claims (6)

  1. Procédé pour relier fonctionnellement un dispositif de commande électronique programmable (2) pourvu d'une mémoire de données et prévu pour la technique domestique, à une multiplicité d'éléments de manoeuvre (11) et/ou d'éléments d'affichage (12), caractérisé en ce que les signaux générés par les éléments de manoeuvre (11) sont interrogés et entrés en série par groupes de signaux, pendant un premier cycle et par l'intermédiaire d'au moins une ligne (8a), dans un registre à décalage (16) pourvu d'emplacements de mémoire individuels, en ce que les signaux, après avoir été entrés, sont transmis parallèlement, lors d'un second cycle, des mémoires individuelles du registre à décalage (16) à un registre de résultats (21) contenant un nombre correspondant d'emplacements de mémoire, et en ce que les entrées de commande du dispositif de commande programmable (2) sont déclenchées par les sorties (23) des emplacements de mémoire du registre de résultats (21).
  2. Procédé selon la revendication 1, caractérisé en ce que les signaux de sortie du dispositif de commande programmable (2) sont placés parallèlement au niveau des entrées (25) d'un registre à décalage (24) pourvu d'une multiplicité d'emplacements de mémoire, et en ce que les informations mémorisées dans le registre à décalage (24) sont transmises de façon cyclique sous la forme d'un article en série à un dispositif (16) en vue du déclenchement des éléments d'affichage (12).
  3. Circuit pour un dispositif de commande programmable (2) prévu pour la technique des bâtiments et destiné à commander des appareils sur panneaux (7), comprenant au moins un dispositif d'affichage (9b) pour l'affichage d'une multiplicité d'états de marche, et au moins un dispositif de manoeuvre (9a) pour l'exécution d'une multiplicité d'opérations de manoeuvre, étant précisé que le dispositif de commande possède des entrées de manoeuvre (23) et des sorties d'affichage (25) parallèles pour la connexion à des éléments de manoeuvre (11) du dispositif de manoeuvre (9a) et à des éléments d'affichage (12) du dispositif d'affichage (9b), caractérisé en ce que les entrées (23) et les sorties (25) sont reliées à au moins un dispositif (16, 21, 24) prévu pour la conversion de données d'entrée en série en données d'entrée parallèles pour les entrées (23), et pour la conversion de données de sortie parallèles au niveau des sorties (25) en groupes de données en série.
  4. Circuit selon la revendication 3, caractérisé en ce que les entrées (23) du dispositif de commande (2) sont reliées, parallèlement, aux sorties d'un registre de résultats (21), en ce que les emplacements de mémoire du registre de résultats sont reliés, parallèlement, aux emplacements de mémoire d'un registre à décalage (16), en ce que l'entrée en série (17) du registre à décalage d'entrée (16) est reliée par l'intermédiaire d'une ligne de données (8a) à la sortie du dispositif de manoeuvre et d'affichage (9), et en ce qu'un système logique d'analyse (18) destiné au déclenchement cyclique du registre de résultats (21) est relié à celui-ci de telle sorte qu'après l'entrée en série d'un article dans le registre à décalage d'entrée (16), les données sont reçues parallèlement dans le registre de résultats (21).
  5. Circuit selon la revendication 3 ou 4, caractérisé en ce que les signaux de sortie du dispositif de commande (2) sont placés aux entrées parallèles d'un registre à décalage de sortie (24), et en ce que la sortie en série du registre à décalage (24) est reliée par l'intermédiaire d'une ligne de données (8b) au dispositif de manoeuvre et d'affichage (9).
  6. Circuit selon l'une des revendications 3 à 5, caractérisé en ce que les registres à décalage (16, 24), le registre de résultats (21) et le système logique d'analyse (18) sont réunis en un circuit d'entrée (2a) qui fait partie intégrante du dispositif de commande (2).
EP90810141A 1989-03-10 1990-02-26 Méthode pour connecter un dispositif de commande programmable avec des éléments d'opération et/ou d'affichage et circuit pour un dispositif de commande programmable Expired - Lifetime EP0387191B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH90889 1989-03-10
CH908/89 1989-03-10

Publications (2)

Publication Number Publication Date
EP0387191A1 EP0387191A1 (fr) 1990-09-12
EP0387191B1 true EP0387191B1 (fr) 1995-02-01

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EP90810141A Expired - Lifetime EP0387191B1 (fr) 1989-03-10 1990-02-26 Méthode pour connecter un dispositif de commande programmable avec des éléments d'opération et/ou d'affichage et circuit pour un dispositif de commande programmable

Country Status (4)

Country Link
EP (1) EP0387191B1 (fr)
AT (1) ATE118110T1 (fr)
DD (1) DD299991A5 (fr)
DE (1) DE59008388D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0616176B1 (fr) * 1993-03-15 1998-07-22 TEMIC TELEFUNKEN microelectronic GmbH Système de réception des données de commande pour installation de climatisation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3516089A (en) * 1967-05-10 1970-06-02 Ind Instrumentations Inc Shift register controlled scanning function monitor
US4276640A (en) * 1979-07-02 1981-06-30 General Motors Corporation Noise tolerant multiplex system

Also Published As

Publication number Publication date
DD299991A5 (de) 1992-05-14
EP0387191A1 (fr) 1990-09-12
ATE118110T1 (de) 1995-02-15
DE59008388D1 (de) 1995-03-16

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