EP0224821A1 - Système de signalisation de dangers - Google Patents

Système de signalisation de dangers Download PDF

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Publication number
EP0224821A1
EP0224821A1 EP86116174A EP86116174A EP0224821A1 EP 0224821 A1 EP0224821 A1 EP 0224821A1 EP 86116174 A EP86116174 A EP 86116174A EP 86116174 A EP86116174 A EP 86116174A EP 0224821 A1 EP0224821 A1 EP 0224821A1
Authority
EP
European Patent Office
Prior art keywords
line
wire
detector
alarm
line wire
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.)
Withdrawn
Application number
EP86116174A
Other languages
German (de)
English (en)
Inventor
Peer Dr.-Ing. Thilo
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of EP0224821A1 publication Critical patent/EP0224821A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/005—Alarm systems in which substations are interrogated in succession by a central station with substations connected in series, e.g. cascade

Definitions

  • Such a hazard alarm system is known from DE-PS 25 33 382.
  • a fire alarm system is described, in which the individual detectors of a detection line using the so-called pulse detection technology with the help of chain synchronization when the detector is queried in time order in each case cause a current increase on the relevant signaling line.
  • a switching transistor is arranged in one of the two wires of a signaling line and is operated in one direction only.
  • a fault occurs on a signal line in such a way that the switching transistor of a detector is defective, the subsequent detectors can no longer be queried or can no longer be queried correctly. Such a fault is recognized and displayed in the control center. If a switching transistor has become permanently conductive, two detectors are queried simultaneously in this case and therefore no longer distinguishable. If a switching transistor no longer switches through, the detectors connected downstream of the defective detector can no longer be queried. However, no alarms from the subsequent detectors can then be recognized and reported until the damage has been remedied. In order to avoid such disturbances or at least to keep them within narrow limits, extremely high-quality switching transistors or particularly suitable protective circuits can be provided. However, these measures would cause a considerably greater circuitry outlay and high costs for each individual detector. Special measures must be taken to ensure that any alarms that occur during this time are not lost.
  • the object of the invention is therefore to avoid these disadvantages and to improve a hazard alarm system described at the outset with relatively little circuitry such that the functional reliability of the system is ensured even with a defective detector and the risk of failure is thus reduced.
  • Each detector has a third line core, which can be switched from a first voltage potential to a second voltage potential.
  • a semiconductor diode is arranged in the reverse direction after the switching transistor between the second line core and the third line core.
  • the third line wire It is useful to switch the third line wire from the potential of the first line wire to the potential of the second line wire in the event of a fault in a signal line when querying this signal line.
  • the switching transistors are arranged in the second line wire. As long as the third line wire is at the potential of the first line wire, nothing happens because the diodes are switched in the reverse direction.
  • the third line core is switched to the potential of the second line core, the individual diodes become conductive, so that when the signal line is interrogated, all detectors are switched to the interrogation voltage potential.
  • the determined time of the line current increase provides information about whether the relevant, faulty signal line is at rest, or whether at least one detector has changed to the alarm state.
  • the point in time of the line current increase in the evaluation device is advantageously determined by measuring the time from the application of the interrogation voltage to the occurrence of the line current increase, the time being shorter in an alarm condition compared to the time of the signal line at rest.
  • the third line wire of each signaling line can change from a first potential to a second between the polling cycles, i.e. during the idle phase, in which each signaling line is connected to a corresponding supply voltage Potential are switched.
  • the third line wire is expediently at the potential of the second line wire.
  • This measure of switching the third line core to the potential of the second line core can advantageously only be provided in the event of an alarm, so that alarm indicators (alarm indicators) associated with the detectors or arranged in the detectors are sufficient Energy can be supplied.
  • alarm indicators alarm indicators
  • a further advantage due to these measures is also given by the fact that considerably more detectors can then be arranged and supplied with energy on a signaling line which, for example, could previously have had up to 30 detectors.
  • the measures according to the invention will be provided in alarm systems which have signal lines with a shield conductor, so that the shield conductor serves as a third conductor.
  • This has the advantage that no additional line installations are required. Only detectors equipped with additional diodes are required and a relatively simple switchover device in the control center.
  • a further possibility for improving the energy supply of the signaling line either between the polling cycles or in the case of energy supply for detectors that have gone into the alarm state is given in that at least the third line wire with its so-called far end is also led to the central station Z and can be switched on there.
  • Fig. 1 shows a hint of a known hazard alarm system with a central Z, in which usually one Evaluation device is provided.
  • Several signaling lines are connected to the control center. Only one signal line ML is shown here, on which three detectors M1 to M3 are arranged by way of example.
  • the line wire a has a potential which is marked with a plus (+).
  • the second line wire b has a potential which is marked with a minus (-).
  • a switching transistor S1 to S3 is arranged in the second line wire b in each detector M1 to M3, which is switched on with a time delay depending on the analog detector measured value and thus switches the subsequent detector to the signal line and thus to the interrogation voltage.
  • An alarm line ML is connected to the central station Z, which here has detectors M1 to M3, for example.
  • the signal line ML has a third conductor c, which can be, for example, the shield line Sch of the signal line.
  • a diode D1 to D3 is arranged after the switching transistor S1 to S3, which connects the second line wire b to the third line wire c in the reverse direction.
  • the switching device US, to which the third line wire c is connected, is also indicated in the central station Z, which normally connects the third line wire c to the potential (+) of the first line wire a.
  • the third line wire c is switched to the potential (-) of the second line wire b. This ensures that, regardless of the switching transistors S1 to S3, all the detectors M1, M2, ... are simultaneously connected to the voltage and thus simultaneously emit their signal according to their delay time, ie the line current (IL) Increase signal line ML. If, for example, the switching transistor S1 of the first detector M1 is defective in such a way that it is continuously switched through, this fault is recognized in the control center and the third line wire c is switched to the potential (-) of the second line wire b, as already mentioned above. The line current (IL) is measured in the evaluation device when this signal line ML is queried and the time of the line current increase is determined.
  • FIG. 3 shows the line current IL over time t as a diagram.
  • the signal line ML is at rest, the first detector M1 is defective, as stated above, and the switching transistor S1 is continuously switched through.
  • the signaling line is switched on and thus a certain current flows on the signaling line, which rises suddenly after time t R time TR.
  • the current increase corresponds to the sum of the current increase of all three detectors, because the current increase takes place simultaneously via the diodes that are now switched through. From the determined time t R until the current increases, the evaluation device recognizes that the signaling line is at rest. With a detector that triggers an alarm, the time to increase the current is significantly shorter than with a detector that is at rest.
  • the current diagram of the signal line ML corresponding to the line current IL is as shown in FIG.
  • the detector M2 which has gone into the alarm state emits its current pulse I2 earlier, ie the evaluation device in the control center determines a current increase I2 after switching on (at time TS) of the signal line after the shorter time t A , that is to say Time TA.
  • This earlier current rise in the faulty signal line is recognized in the evaluation device as an alarm on the relevant signal line and displayed as a line alarm. In this way it can be determined in the control center that at least one detector of the faulty signal line is in the alarm state.
  • the operating mode described here can also be switched on in the case of an undisturbed system, for example after the correct query.
  • the interface according to the invention is operated between the individual polling cycles, ie in the idle phase in which the signal line is connected to the supply voltage. This is particularly advantageous if a detector in the signaling line has gone into the alarm state.
  • This operating mode then has the effect, for example, that the supply current of an indicator lamp L (FIG. 2), which is switched on by suitable means (not shown here), instead of many switching transistors Si only via one diode, in the switching example according to FIG. must flow and thus many smaller voltage losses can be avoided.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
EP86116174A 1985-11-26 1986-11-21 Système de signalisation de dangers Withdrawn EP0224821A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3541749 1985-11-26
DE3541749 1985-11-26

Publications (1)

Publication Number Publication Date
EP0224821A1 true EP0224821A1 (fr) 1987-06-10

Family

ID=6286868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86116174A Withdrawn EP0224821A1 (fr) 1985-11-26 1986-11-21 Système de signalisation de dangers

Country Status (1)

Country Link
EP (1) EP0224821A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4030298A1 (de) * 1990-09-25 1992-03-26 Siemens Ag Gefahrenmeldeanlage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1007471A (fr) * 1949-12-29 1952-05-06 Cie Francaise Du Signum Procédé pour localiser une modification survenue à un circuit électrique de détection ou analogue et dispositifs pour la mise en oeuvre de ce procédé
DE2533382C2 (de) * 1975-07-25 1980-07-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen Verfahren und Einrichtung zur Übertragung von Meßwerten in einem Brandmeldesystem

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1007471A (fr) * 1949-12-29 1952-05-06 Cie Francaise Du Signum Procédé pour localiser une modification survenue à un circuit électrique de détection ou analogue et dispositifs pour la mise en oeuvre de ce procédé
DE2533382C2 (de) * 1975-07-25 1980-07-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen Verfahren und Einrichtung zur Übertragung von Meßwerten in einem Brandmeldesystem

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4030298A1 (de) * 1990-09-25 1992-03-26 Siemens Ag Gefahrenmeldeanlage
EP0477607A3 (en) * 1990-09-25 1992-12-09 Siemens Aktiengesellschaft Risk signal arrangement

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Inventor name: THILO, PEER, DR.-ING.