EP0093095A2 - A method and an apparatus for identifying a detector giving an alarm in a loop circuit having a predetermined number of detectors connected in parallel - Google Patents
A method and an apparatus for identifying a detector giving an alarm in a loop circuit having a predetermined number of detectors connected in parallel Download PDFInfo
- Publication number
- EP0093095A2 EP0093095A2 EP83850093A EP83850093A EP0093095A2 EP 0093095 A2 EP0093095 A2 EP 0093095A2 EP 83850093 A EP83850093 A EP 83850093A EP 83850093 A EP83850093 A EP 83850093A EP 0093095 A2 EP0093095 A2 EP 0093095A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- alarm
- loop circuit
- line unit
- detector
- 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- Withdrawn
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop
Definitions
- the present invention relates to a method of identifying a detector giving an alarm, said detector being one of a predetermined number of detectors connected in parallel in a loop circuit connected to a line unit, which supplies the loop circuit with a first signal, said detectors in their alarm state giving a predetermined voltage drop across the loop circuit in response to the first signal, said voltage drop giving rise to an alarm signal from the line unit, the invention also relating to an apparatus for carrying out the method.
- the object of the present invention is to provide a method and an apparatus enabling the reception of both identity and priority information from a detector giving an alarm.
- Figure 1 illustrates an embodiment of a loop circuit connected to a line unit and having a plurality of detectors connected in parallel, said loop circuit being terminated by an end circuit
- Figure 2 illustrates an embodiment of a detector connected into the loop circuit of Figure 1
- Figure 3 illustrates an embodiment of the line unit illustrated in Figure 1
- Figure 4 is a diagram of the voltage across the input of the line unit for both the alarm and normal state of the detector in Figure 2.
- the line circuit 1 is also connected to a central unit (not shown) via lines 4, 5 and 6.
- Figure 2 schematically illustrates an embodiment of a detector 2 in Figure 1. It should be pointed out in this connection that all the detectors illustrated in Figure 1 do not need to be constructed in the manner illustrated in Figure 2.
- the detector 2 of Figure 2 is of the type giving a predetermined voltage drop across the loop circuit when in an alarm state. In the alarm state, a contact 7 in the detector 2 closes, this contact being connected in series with a component 8, e g a Zener diode, giving said predetermined voltage drop across the loop circuit when the contact 7 is closed.
- This contact does not need to be mechanical, but can e g be a transistor or a thyristor.
- a resistor 9 is connected in series with the contact 7 and diode 8.
- the identity signal from the transistor 13, which can be a pulse train 17, is decoded with the aid of the voltage decoder 14 in the line unit 1, and the decoded identity signal is fed from the line unit 1 to the unillustrated central unit via the line 16 for presentation on a display.
- Detectors in the same room may be programmed with the same identity signal to obtain an area alarm within a monitored section.
- the identity signal can also contain priority information, which is also decoded with the aid of the voltage decoder 14 and sent to the unillustrated central unit via the line 5.
- the pulse train from the memory 12 is intended to be fed to the voltage decoder 14 a predetermined number of times, so that identification is ensured.
Abstract
Description
- The present invention relates to a method of identifying a detector giving an alarm, said detector being one of a predetermined number of detectors connected in parallel in a loop circuit connected to a line unit, which supplies the loop circuit with a first signal, said detectors in their alarm state giving a predetermined voltage drop across the loop circuit in response to the first signal, said voltage drop giving rise to an alarm signal from the line unit, the invention also relating to an apparatus for carrying out the method.
- In fire detector systems, for example, it is essential that when there is an alarm, information is quickly received as to what detector the alarm comes from. It is known in the art to provide each detector with an identifying component which changes the loop circuit impedance in a manner characteristic to the detector when it gives an alarm, so that the particular detector can be identified. The identifying information is not obtained directly from the respective detector, however, which is a disadvantage, since alterations in the self-impedance of the loop circuit can give rise to false alarms or to the wrong detector being identified. Furthermore, this solution gives no possibility of differentiating priorities between different alarm states, which is a further disadvantage.
- The object of the present invention is to provide a method and an apparatus enabling the reception of both identity and priority information from a detector giving an alarm.
- This object is obtained by the method and apparatus in accordance with the invention being given the characterizing features disclosed in the claims.
- The invention will now be described in detail below with reference to the accompanying drawing, on which Figure 1 illustrates an embodiment of a loop circuit connected to a line unit and having a plurality of detectors connected in parallel, said loop circuit being terminated by an end circuit, Figure 2 illustrates an embodiment of a detector connected into the loop circuit of Figure 1, Figure 3 illustrates an embodiment of the line unit illustrated in Figure 1 and Figure 4 is a diagram of the voltage across the input of the line unit for both the alarm and normal state of the detector in Figure 2.
- Figure 1 illustrates a
line unit 1, to which there is connected a loop circuit having a plurality ofdetectors 2, e g fire detectors, connected in parallel. In parallel with thedetectors 2 there is also connected to the loop circuit an end circuit 3, which may consist of a flipflop. In the non-alarm state or normal state of the loop circuit this flipflop provides an idling pulse train over theline circuit 1, and this pulse train will be described in detail in conjunction with Figure 4. - The
line circuit 1 is also connected to a central unit (not shown) vialines 4, 5 and 6. - Figure 2 schematically illustrates an embodiment of a
detector 2 in Figure 1. It should be pointed out in this connection that all the detectors illustrated in Figure 1 do not need to be constructed in the manner illustrated in Figure 2. Thedetector 2 of Figure 2 is of the type giving a predetermined voltage drop across the loop circuit when in an alarm state. In the alarm state, acontact 7 in thedetector 2 closes, this contact being connected in series with acomponent 8, e g a Zener diode, giving said predetermined voltage drop across the loop circuit when thecontact 7 is closed. This contact does not need to be mechanical, but can e g be a transistor or a thyristor. Aresistor 9 is connected in series with thecontact 7 anddiode 8. Thisresistor 9 is connected between the base and emitter of atransistor 10, the emitter thereof being connected to one conductor of the loop circuit, while its collector is connected to the other conductor of the loop circuit via areference voltage generator 11. Thegenerator 11 is in turn connected to amemory 12, which has been preprogrammed with detector identification information. The output of thememory 12 is connected to the base of atransistor 13, the collector-emitter path of which is connected between both conductors of the loop circuit. - An embodiment of the
line unit 1 of Figure 1 is illustrated in Figure 3. In theline unit 1 the terminals A and B connected to the loop circuit are connected such that A is connected to the positive pole of a direct voltage source, and B is connected to the input of avoltage decoder 14 as well as to the output of asignal generator 15. Thevoltage decoder 14 is adapted to sense the voltage at the terminal B and in response thereto to cause thesignal generator 15 to change the current fed to the loop circuit via terminal B. Thedecoder 14 is also connected to the unillustrated central unit for emitting alarm and identity signals to it. - The function of the apparatus illustrated in Figures 1-3 will now be described in conjunction with Figure 4, where the diagram illustrates the voltage UB between the terminal B and the minus pole of the DC source in Figure 3.
- At the start of the diagram, i e in the normal state, when none of the
detectors 2 is in the alarm state, the impedance of the end circuit 3 changes and thesignal generator 15 in theline unit 1 causes the voltage at the point B to form anidling pulse train 16. As long as nodetector 2 is in'the alarm state, this idling pulse train will continue to occur, and is accepted by theline unit 1 as the normal state. - When a
detector 2 gives an alarm, by itscontact 7 closing, the voltage will rise at the point B, and accordingly the idling pulse train will cease, e g at the time tl. Thevoltage decoder 14 in theline unit 1 is adapted to accept this voltage increase as an alarm state and emit an alarm signal to the central unit via the line 4. Thesignal generator 15 is also controlled by thevoltage decoder 14 such as to increase the current in the loop circuit, the voltage across theresistor 9 then making thetransistor 10 conductive. Thereference voltage generator 11 thus obtains current for exciting thememory 12 to read out its preprogrammed identity signa! fcr controlling thetransistor 13. The identity signal from thetransistor 13, which can be apulse train 17, is decoded with the aid of thevoltage decoder 14 in theline unit 1, and the decoded identity signal is fed from theline unit 1 to the unillustrated central unit via theline 16 for presentation on a display. - Detectors in the same room, for example, may be programmed with the same identity signal to obtain an area alarm within a monitored section.
- The identity signal can also contain priority information, which is also decoded with the aid of the
voltage decoder 14 and sent to the unillustrated central unit via theline 5. - The pulse train from the
memory 12 is intended to be fed to the voltage decoder 14 a predetermined number of times, so that identification is ensured. - What detector is giving an alarm and what priority the alarm has are thus easily determined in a simple manner with the aid of the apparatus in accordance with the invention.
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8202566 | 1982-04-23 | ||
SE8202566A SE8202566L (en) | 1982-04-23 | 1982-04-23 | PROCEDURE AND DEVICE FOR IDENTIFYING AN ALARMING DETECTOR IN A CIRCUIT WITH A PRESET NUMBER OF PARALLEL CONNECTED DETECTORS |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0093095A2 true EP0093095A2 (en) | 1983-11-02 |
EP0093095A3 EP0093095A3 (en) | 1986-12-30 |
Family
ID=20346627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83850093A Withdrawn EP0093095A3 (en) | 1982-04-23 | 1983-04-12 | A method and an apparatus for identifying a detector giving an alarm in a loop circuit having a predetermined number of detectors connected in parallel |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0093095A3 (en) |
DK (1) | DK179483A (en) |
FI (1) | FI830990L (en) |
NO (1) | NO831433L (en) |
SE (1) | SE8202566L (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0167669A1 (en) * | 1984-06-05 | 1986-01-15 | Siemens Aktiengesellschaft | Method of and device for identifying an alarm triggering sensor in a danger signalling device |
EP0178474A2 (en) * | 1984-09-20 | 1986-04-23 | Siemens Aktiengesellschaft | Method and arrangement for the detector identification of a hazard detection system |
FR2580100A1 (en) * | 1985-04-09 | 1986-10-10 | Hochiki Co | |
DE4104590A1 (en) * | 1990-02-15 | 1991-08-29 | Needs Electronics Co | Building alarm system - has central unit to which are coupled two signal lines with series-connected sensor discriminators |
FR2723232A1 (en) * | 1994-07-29 | 1996-02-02 | Lewiner Jacques | IMPROVEMENTS TO ALARM DETECTORS FOR BUILDING MONITORING |
WO1997020295A1 (en) * | 1995-11-28 | 1997-06-05 | Rolf Edman | A controlling and/or registration system |
GB2321747A (en) * | 1997-01-30 | 1998-08-05 | Rafiki Protection Limited | Fire alarm system |
WO2007096523A2 (en) | 2006-02-24 | 2007-08-30 | Airbus France | Fire detection system and aircraft equipped with such a system |
US8902760B2 (en) | 1998-04-10 | 2014-12-02 | Chrimar Systems, Inc. | Network system and optional tethers |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3757301A (en) * | 1971-06-17 | 1973-09-04 | Eaton Corp | Single cable signaling system |
US3778796A (en) * | 1970-03-31 | 1973-12-11 | Nittan Co Ltd | Fire alarming system |
US3803594A (en) * | 1972-07-17 | 1974-04-09 | Johnson Service Co | Programmed time division multiplexed coded tone transmission system |
US3846794A (en) * | 1973-03-15 | 1974-11-05 | Baker Ind Inc | Alarm retransmission system |
US4228424A (en) * | 1978-10-16 | 1980-10-14 | Baker Protective Services, Incorporated | Central station alarm |
-
1982
- 1982-04-23 SE SE8202566A patent/SE8202566L/en unknown
-
1983
- 1983-03-23 FI FI830990A patent/FI830990L/en not_active Application Discontinuation
- 1983-04-12 EP EP83850093A patent/EP0093095A3/en not_active Withdrawn
- 1983-04-22 NO NO831433A patent/NO831433L/en unknown
- 1983-04-22 DK DK179483A patent/DK179483A/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3778796A (en) * | 1970-03-31 | 1973-12-11 | Nittan Co Ltd | Fire alarming system |
US3757301A (en) * | 1971-06-17 | 1973-09-04 | Eaton Corp | Single cable signaling system |
US3803594A (en) * | 1972-07-17 | 1974-04-09 | Johnson Service Co | Programmed time division multiplexed coded tone transmission system |
US3846794A (en) * | 1973-03-15 | 1974-11-05 | Baker Ind Inc | Alarm retransmission system |
US4228424A (en) * | 1978-10-16 | 1980-10-14 | Baker Protective Services, Incorporated | Central station alarm |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0167669A1 (en) * | 1984-06-05 | 1986-01-15 | Siemens Aktiengesellschaft | Method of and device for identifying an alarm triggering sensor in a danger signalling device |
EP0178474A2 (en) * | 1984-09-20 | 1986-04-23 | Siemens Aktiengesellschaft | Method and arrangement for the detector identification of a hazard detection system |
EP0178474A3 (en) * | 1984-09-20 | 1988-07-20 | Siemens Aktiengesellschaft Berlin Und Munchen | Method and arrangement for the detector identification of a hazard detection system |
FR2580100A1 (en) * | 1985-04-09 | 1986-10-10 | Hochiki Co | |
DE4104590A1 (en) * | 1990-02-15 | 1991-08-29 | Needs Electronics Co | Building alarm system - has central unit to which are coupled two signal lines with series-connected sensor discriminators |
FR2723232A1 (en) * | 1994-07-29 | 1996-02-02 | Lewiner Jacques | IMPROVEMENTS TO ALARM DETECTORS FOR BUILDING MONITORING |
WO1996004629A1 (en) * | 1994-07-29 | 1996-02-15 | Jacques Lewiner | Improvements relating to alarm detectors for building surveillance |
WO1997020295A1 (en) * | 1995-11-28 | 1997-06-05 | Rolf Edman | A controlling and/or registration system |
GB2321747A (en) * | 1997-01-30 | 1998-08-05 | Rafiki Protection Limited | Fire alarm system |
GB2321747B (en) * | 1997-01-30 | 2000-10-18 | Rafiki Protection Limited | Alarm system |
US8902760B2 (en) | 1998-04-10 | 2014-12-02 | Chrimar Systems, Inc. | Network system and optional tethers |
US9049019B2 (en) | 1998-04-10 | 2015-06-02 | Chrimar Systems, Inc. | Network equipment and optional tether |
US9812825B2 (en) | 1998-04-10 | 2017-11-07 | Chrimar Systems, Inc. | Ethernet device |
WO2007096523A2 (en) | 2006-02-24 | 2007-08-30 | Airbus France | Fire detection system and aircraft equipped with such a system |
FR2897968A1 (en) * | 2006-02-24 | 2007-08-31 | Airbus France Sas | Concerned area`s fire detection system for aircraft, has two detectors connected to terminals of fire detection unit and providing respective values of electrical magnitude in their determined state, where two values differ from each other |
WO2007096523A3 (en) * | 2006-02-24 | 2007-10-11 | Airbus France | Fire detection system and aircraft equipped with such a system |
US8094030B2 (en) | 2006-02-24 | 2012-01-10 | Airbus Operations Sas | Fire detection system and aircraft equipped with such a system |
CN101389381B (en) * | 2006-02-24 | 2012-12-26 | 空中客车运营简化股份公司 | Fire detection system and aircraft equipped with such a system |
Also Published As
Publication number | Publication date |
---|---|
FI830990L (en) | 1983-10-24 |
SE8202566L (en) | 1983-10-24 |
FI830990A0 (en) | 1983-03-23 |
NO831433L (en) | 1983-10-24 |
DK179483A (en) | 1983-10-24 |
EP0093095A3 (en) | 1986-12-30 |
DK179483D0 (en) | 1983-04-22 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Designated state(s): CH DE IT LI NL |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: CERBERUS AG |
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PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
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AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): CH DE IT LI NL |
|
17P | Request for examination filed |
Effective date: 19870121 |
|
17Q | First examination report despatched |
Effective date: 19871002 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19890301 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: GLANSHED, BENNI GOERAN INGEMAR |