EP0014329A1 - Installation de signalisation de danger comportant un dispositif de mesure de fréquence dans un poste central - Google Patents

Installation de signalisation de danger comportant un dispositif de mesure de fréquence dans un poste central Download PDF

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Publication number
EP0014329A1
EP0014329A1 EP80100142A EP80100142A EP0014329A1 EP 0014329 A1 EP0014329 A1 EP 0014329A1 EP 80100142 A EP80100142 A EP 80100142A EP 80100142 A EP80100142 A EP 80100142A EP 0014329 A1 EP0014329 A1 EP 0014329A1
Authority
EP
European Patent Office
Prior art keywords
intermediate station
transmission line
line
voltage
power supply
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.)
Granted
Application number
EP80100142A
Other languages
German (de)
English (en)
Other versions
EP0014329B1 (fr
Inventor
Karlheinz Schreyer
Josef Voringer
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.)
Siemens AG
Original Assignee
Siemens 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
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT80100142T priority Critical patent/ATE805T1/de
Publication of EP0014329A1 publication Critical patent/EP0014329A1/fr
Application granted granted Critical
Publication of EP0014329B1 publication Critical patent/EP0014329B1/fr
Expired legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/006—Alarm systems in which substations are interrogated in succession by a central station with substations connected to an individual line, e.g. star configuration

Definitions

  • the invention relates to a hazard detection system with a frequency measuring device provided in a control center, with a plurality of detectors which can be connected to a direct voltage for power supply in each case via a two-wire holder line and which also contain a circuit arrangement for switching on the relevant one Generate detector line a frequency characterizing their signaling state, with several detector lines each leading to an intermediate station, in which all connected detector lines can be connected serially to a single two-wire transmission line connecting the intermediate station to the control center by means of a time-division multiplexing device
  • Such alarm systems are known. Since the individual detectors are often very far from the control center, the detector lines of detectors which are spatially adjacent to one another are combined in an intermediate station in a so-called concentrator, from which the data are then transmitted to the control center via a single two-wire line. In this way, line costs can be saved. For example, up to 16 detector lines can be connected to such concentrators.
  • Freauenzmelder are very often used in emergency call systems, because they can be operated over DC-connected lines as well as over DC-blocked.
  • these detectors always require an energy supply from a DC voltage source. This is not a problem with DC-switched lines, since all detectors can be fed remotely from the control center.
  • the transmission line between the control center and the detectors or the intermediate station must be blocked in terms of DC voltage. In such cases, it has so far been customary to supply each detector on site with its own battery.
  • a further energy source is required in the intermediate station for the energy supply of the time-division multiplex device. This means a great deal of effort for installation and maintenance, since each element must have a mains connection and a battery.
  • the object of the invention is to design a hazard detection system of the type mentioned at the outset in such a way that local feeding of the individual detectors is no longer necessary if there is a DC-connected line between the detector and the concentrator.
  • the intermediate station should be designed in this way be that both the Time-division multiplexing device as well as the detectors can be remotely fed from the control center in the case of lines which are switched through with direct voltage, and that a single direct voltage source can be used in the intermediate station for supplying power to the time-division multiplexing device and for remote feeding of the detectors in the case of lines which are blocked with direct current without changing the circuit.
  • this object is achieved in a hazard alarm system of the type mentioned at the outset in that in the intermediate station, a power supply circuit for the time-division multiplex device is connected to the two wires of the transmission line in parallel with the time-division multiplex device by means of a choke in each case, that this power supply circuit has a parallel connection for one in the intermediate station Provided DC voltage source and a device for keeping the voltage constant, and that finally means are provided to carry out a DC-current shutdown of the intermediate station from the center in the transmission line.
  • the circuit arrangement according to the invention in the intermediate station eliminates any energy supply to the individual detectors on site.
  • the detectors therefore always receive their DC voltage via the time-division multiplexing device; this means that they are only connected to DC voltage at the time of the query, so that overall energy is saved.
  • the DC voltage from the transmission line is simply switched through to the detectors via the time-division multiplexing device.
  • the supply voltage is decoupled from the transmission line for feeding the time-division multiplexing device via the two chokes.
  • a local supply of the time multiplexing means is provided by a DC voltage source in the intermediate station.
  • the energy for the individual detectors is fed into the time-division multiplexing device via the two chokes.
  • a zener diode is usually provided in the input circuit of the local power supply circuit.
  • this circuit expediently contains a capacitor with high capacitance. This serves as a charge store for the local power supply circuit. It also prevents the voltage from collapsing briefly each time the time-division multiplex device is switched to the next detector line.
  • a major advantage of the intermediate station design according to the invention is that the circuit can be used for the remote supply from the central station and for the supply of a local battery in the intermediate station without any change.
  • the connection of the intermediate station to an unlocked transmission line in one case and to a locked line in the other case can be carried out using conventional switching means, for example by changing between two pairs of sockets or by manual switching. In an expedient embodiment of the invention, this switchover is carried out automatically.
  • a voltage detection device is provided between the battery input terminals of the local power supply circuit in the intermediate station. As soon as a battery is connected to the input terminals, this voltage detection device - in the simplest case a relay - responds and switches the unlocked input of the intermediate station to the locked input.
  • the drawing shows the structure of a hazard alarm system according to the invention with a central Z, to which an intermediate station ZS is connected via a transmission line UL.
  • the individual detectors M1 to M16 can be connected to the intermediate station ZS via one detector line ML1 to ML16 each.
  • the individual detectors M1 to M16 are supplied with DC voltage from the central station Z or from the intermediate station ZS. They each contain an oscillator, indicated with a capacitor C M and an inductance L M , with which they generate an AC voltage of a certain frequency on the detector line. With a key T M , the inductance L M and thus the frequency generated by the detector can be changed. Instead of the quiescent frequency, the alarm frequency is received in control center Z.
  • the control center has a DC voltage source G for remote supply of the individual detectors M1 to M16 and the intermediate station ZS.
  • the DC voltage source is separated from the detector AC voltage via an inductance L Z.
  • the center Z has a frequency measuring device FM, which is separated from the DC voltage source G by a capacitance C Z.
  • the frequency measuring device measures the idle or alarm frequencies generated by the individual detectors M1 to M16. These measurement results are evaluated in the usual way. Insofar as the individual detectors generate different basss, the detectors can also be identified via the fruity measuring device. This use of frequency detectors and the evaluation is on is known, so that this will not be discussed further.
  • the intermediate station ZS is provided to save on the lines.
  • the time-division multiplex device ZM is connected to the transmission line UL. It briefly switches the two line cores in sequence to each of the kiln lines ML1 to ML16.
  • the individual detectors are only supplied with DC voltage via the time-division multiplexing device ZM during this short connection time and generate their detector frequency during this time, that of the intermediate station and the Transmission line UL is transmitted to the control center
  • a synchronization detector MS is provided which generates a fixed frequency and is switched on once in the polling cycle this S y n z nchronisierfreque receives, it recognizes that thereafter a new query cycle begins.
  • the two line wires a and b in the intermediate station ZS can be connected through to the control center with a direct voltage or can be blocked with a direct voltage via the capacitors Ca and Cb.
  • An internal power supply circuit of the intermediate station ZS is also connected in parallel to the two line wires a and b via the chokes La and Lb.
  • This internal power supply circuit SV generates the supply voltages (for example U1) for the time mutliplex device, for example for a clock generator TG, which records the time forwarded multiplexing device in the intended manner.
  • the power supply circuit is shown in simplified form with a series transistor T.
  • different potentials and, accordingly, different power supply circuits are used.
  • input terminals for connecting a local battery B are provided on the power supply circuit.
  • a Zener diode Z is used for voltage stabilization, and a filter capacitor C is provided in parallel.
  • the battery B is not connected in the intermediate station ZS, the contacts s1 and s2 assume the position shown.
  • the DC voltage passes from the control center via the two chokes La and Lb to the stabilizing diode Z.
  • the filter capacitor C is charged via the diode D1.
  • This filter capacitor C serves as a charge store for the power supply, and with the diode D1 it also prevents a breakdown of the voltage each time the time-division multiplexing device ZM is switched to the next detector line. If a detector line is short-circuited as a result of a fault, the charge is prevented from flowing out of the capacitor C via the diode D1.
  • the battery B In the case of local supply by the battery B, its supply voltage reaches the stabilizing diode Z via the current limiting resistor R and the polarity reversal protection diode D2. From here, the voltage reaches the internal power supply SV and the chokes La and Lb to the input of the time division multiplex device ZM.
  • the switching relay S is also energized by the battery B, so that the lines a and b are blocked by switching the contacts s1 and s2. Instead of this automatic changeover, the line wires could of course also be switched over manually.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Alarm Devices (AREA)
  • Alarm Systems (AREA)
  • Road Signs Or Road Markings (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Selective Calling Equipment (AREA)
EP80100142A 1979-01-29 1980-01-11 Installation de signalisation de danger comportant un dispositif de mesure de fréquence dans un poste central Expired EP0014329B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80100142T ATE805T1 (de) 1979-01-29 1980-01-11 Gefahrenmeldeanlage mit einer in einer zentrale vorgesehenen frequenzmessvorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2903266 1979-01-29
DE2903266A DE2903266C2 (de) 1979-01-29 1979-01-29 Gefahrenmeldeanlage

Publications (2)

Publication Number Publication Date
EP0014329A1 true EP0014329A1 (fr) 1980-08-20
EP0014329B1 EP0014329B1 (fr) 1982-03-31

Family

ID=6061613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80100142A Expired EP0014329B1 (fr) 1979-01-29 1980-01-11 Installation de signalisation de danger comportant un dispositif de mesure de fréquence dans un poste central

Country Status (5)

Country Link
EP (1) EP0014329B1 (fr)
AT (1) ATE805T1 (fr)
DE (1) DE2903266C2 (fr)
DK (1) DK149354C (fr)
NO (1) NO146518C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989012289A1 (fr) * 1988-06-03 1989-12-14 Raychem Corporation Procedes, systemes et appareil de detection de changements dans des variables
WO2004102513A1 (fr) * 2003-05-14 2004-11-25 Jens Marius Johnsen Presentation de messages publicitaires sur le sol

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3336290A1 (de) * 1982-10-08 1984-06-07 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Verfahren zur fernuebertragung von daten einer heizungs- oder kuehlanlage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2341087A1 (de) * 1973-08-14 1975-02-27 Siemens Ag Automatische brandmeldeanlage
DE2533382B1 (de) * 1975-07-25 1976-10-21 Siemens Ag Verfahren und Einrichtung zur UEbertragung von Messwerten in einem Brandmeldesystem
DE2641489A1 (de) * 1976-09-15 1978-03-16 Siemens Ag Verfahren zur uebertragung unterschiedlicher analoger messwerte an eine zentrale von mehreren kettenfoermig an einer meldelinie liegenden brandmeldern

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2202110B2 (de) * 1972-01-18 1974-03-21 Gerhard Dr.-Ing. 8000 Muenchen Gruenberger Einrichtung zum Überwachen einer Anzahl von Meldestellen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2341087A1 (de) * 1973-08-14 1975-02-27 Siemens Ag Automatische brandmeldeanlage
DE2533382B1 (de) * 1975-07-25 1976-10-21 Siemens Ag Verfahren und Einrichtung zur UEbertragung von Messwerten in einem Brandmeldesystem
DE2641489A1 (de) * 1976-09-15 1978-03-16 Siemens Ag Verfahren zur uebertragung unterschiedlicher analoger messwerte an eine zentrale von mehreren kettenfoermig an einer meldelinie liegenden brandmeldern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989012289A1 (fr) * 1988-06-03 1989-12-14 Raychem Corporation Procedes, systemes et appareil de detection de changements dans des variables
WO2004102513A1 (fr) * 2003-05-14 2004-11-25 Jens Marius Johnsen Presentation de messages publicitaires sur le sol

Also Published As

Publication number Publication date
ATE805T1 (de) 1982-04-15
NO146518B (no) 1982-07-05
DE2903266A1 (de) 1980-08-07
DK149354B (da) 1986-05-12
NO146518C (no) 1982-10-13
DK35180A (da) 1980-07-30
DE2903266C2 (de) 1985-08-08
NO794142L (no) 1980-07-30
EP0014329B1 (fr) 1982-03-31
DK149354C (da) 1986-11-03

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