EP0717386A1 - Dispositif de détection et d'alarme - Google Patents

Dispositif de détection et d'alarme Download PDF

Info

Publication number
EP0717386A1
EP0717386A1 EP95410134A EP95410134A EP0717386A1 EP 0717386 A1 EP0717386 A1 EP 0717386A1 EP 95410134 A EP95410134 A EP 95410134A EP 95410134 A EP95410134 A EP 95410134A EP 0717386 A1 EP0717386 A1 EP 0717386A1
Authority
EP
European Patent Office
Prior art keywords
detectors
detector
line
voltage
current
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Withdrawn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
EP95410134A
Other languages
German (de)
English (en)
French (fr)
Inventor
Pascal Grange
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.)
TALCO ALARME - UNIVERSAL DET SA
Original Assignee
Schneider Electric SE
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0717386A1 publication Critical patent/EP0717386A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • G08B26/001—Alarm systems in which substations are interrogated in succession by a central station with individual interrogation of substations connected in parallel

Definitions

  • Known detection devices generally include an alarm center receiving information from detectors.
  • the connections between the central unit and the detectors are generally two-wire.
  • the central unit supplies electrical power to the detectors connected in parallel on the connection wires.
  • the detectors send alarm signals to the control panel.
  • the detectors signal the presence of a danger by modifying the impedance of the circuit or by absorbing current.
  • the voltage applied to the line by the central unit is continuously polarized.
  • Information can pass through two or three voltage levels, for example 24V, 18V and 15V.
  • Known detection devices generally include several power sources for the transmission of signals.
  • the continuous polarization of the detectors does not allow easy identification of defective or badly wired detectors.
  • the voltage drop in the connecting wires can disturb the reading of the different voltage levels.
  • the object of the invention is to provide a simple, economical and reliable detection and alarm device.
  • the central unit includes polarity reversal means connected between the supply circuit and the transmission line and comprising a control input connected to the processing unit, the detectors comprising means of rectification connected to the line and means for detecting the polarity of the line voltage.
  • the address and synchronization signals are merged.
  • a first response bit of a detector is synchronized to a first half-wave of the synchronization signals and a second response bit of the detector is synchronized to a second half-wave of said signals.
  • FIG. 1 represents a diagram of an installation comprising a fire detection device.
  • FIG. 2 shows a fire detection device according to an embodiment of the invention.
  • FIG. 3 represents a diagram of a fire detector which can be used in the device of FIG. 2.
  • Figure 4 shows a flow diagram of the operation of a detector.
  • FIGS 5 and 6 illustrate voltage and current signals from the transmission line used with addressable detectors.
  • a fire detection device shown in Figure 1 includes an alarm center 1 for reporting a fire risk.
  • Fire detectors 2a-2g are connected in parallel through two-wire 3a-3c lines to the control unit 1.
  • each wire of the lines is continuously polarized, for example an L + wire has a voltage polarity positive and an L- wire has a negative voltage polarity.
  • the fire detectors 2a-2g are polarized and the direction of the wiring on the wires of the line must be respected.
  • the alarm center 1 can differentiate the starting lines 3a, 3b and 3c to indicate which line is the detector which reacted to the presence of a fire. This differentiation is simple but does not make it possible to locate precisely the detectors connected to the same line.
  • more complex devices include central units emitting an address signal for each detector. The detectors receive all the addresses and respond to the control panel when they have recognized their address signal. In known manner, the control unit sends logic signals at two voltage levels, to transmit the address signal, generally between 24 V and 18 V. The detectors respond in most devices by a variation in voltage or impedance, or by current absorption. These precise and similar voltages do not allow long line lengths or a large number of detectors.
  • the switches are controlled by control signals Cm supplied by the processing unit 8.
  • the switches S1 and S4 are closed and the switches S2 and S3 are open.
  • the polarity reversal on the lines is carried out by closing S2 and S3 and opening S1 and S4.
  • the processing unit controls signaling members 19 and 20 when the signal IL carries information representative of the detection of a fire.
  • the signaling members may for example be of the visual type 19 or of the sound type 20.
  • the detectors are no longer sensitive to the absolute values of the voltage, but to the variations in polarity caused by the inverter circuit 6.
  • the value of the voltage is no longer critical, the connections between the central unit and the detectors can be longer and the number of detectors higher. This allows the detectors to be powered regardless of the state of the line.
  • the wires L1 and L2 of the link with the central unit can both have voltages of positive and negative polarities.
  • Each detector comprises a rectifier bridge 9 constituted by four diodes D1, D2, D3 and D4.
  • the alternating inputs of the bridge receive the wires L1 and L2 of the link, L1 being connected to the anode of D1 and to the cathode of D4, L2 being connected to the anode of D3 and to the cathode of D2.
  • the positive output VD + of the bridge, connected to the anodes of D1 and D2, and the negative output VD- of the bridge, connected to the cathodes of D3 and D4, supply the components of the detector.
  • the active part of the detector comprises a detection member 10 controlling a response circuit represented by a transistor T2 and a resistor R3.
  • the emitter of transistor T2 is connected to the negative output VD-, its collector at a first end of the resistor R3 and the second end of the resistor R3 at the output VD +, the base of the transistor being connected to the detection device .
  • a circuit for shaping and detecting polarity comprising a transistor T1 and two resistors R1 and R2, provides the sign of the polarity of the voltage in the wires L1 and L2.
  • a first end of the resistor R1 is connected to the line L2, its second end is connected to the base of the transistor T1.
  • the emitter of transistor T1 is connected to line VD-.
  • the collector of T1 connected to an input 11 of the member 10, transmits to it the value of the sign of the polarity of the lines L1 and L2, the polarization of the collector being produced by a resistor R2 connected between the collector and the line VD +.
  • the transistor T1 When the polarity of L2 is positive, the transistor T1 is conductive and the input 11 is at a voltage close to that of the line VD-.
  • the change of polarity of L2 blocks the transistor T1, and the voltage of the input 11 is close to the voltage of the line VD +.
  • the transistor T2 and the resistor R3 can be replaced by current limiting circuits controlled by the member 10.
  • a detection member The operation of a detection member is represented by a flowchart in FIG. 4.
  • the detection member reads the signs of the tensions of the connecting wires on the input 11.
  • the values of the signs SG are processed in an address recognition step 13.
  • the addresses are integrated in a frame of signals, emitted by the central, they are used to select the detectors.
  • AD information is generated in the detection member.
  • the selection information AD, the values of the signs SG read in step 12, and information DF generated during a fire detection step 14, are processed in a step 15, so as to provide a response signal towards the central.
  • the DF information, representative of the fire detection is synchronized with synchronization signals emitted by the control panel. Said synchronization signals are integrated into a frame of signals conveyed by the variations in the values of the signs SG.
  • the response signal representative of the DF information, controls the transistor T2 which varies the current in the line to send the DF information to the central unit.
  • FIG. 5 shows the voltage and current signals according to a first embodiment.
  • the voltage VL between the connecting wires L1 and L2, shown on curve 5a can take a positive value VL + or a negative value VL-.
  • a first part 16 of a signal frame sent by the central unit is used for the synchronous transmission of the addresses.
  • the coding of the synchronous transmission can, for example, be of Manchester type.
  • the address is read by the detector at times t1, t2, t3 and t4 corresponding to rising or falling edges, the direction of the edge determining the logic value transmitted.
  • the detection device detects the presence of an edge from the signals supplied to it on input 11.
  • a second part of the frame of curve 5a comprises data synchronization signals.
  • the detector transmits data to the control panel by changing the value of the current of the IL line.
  • Curve 5b shows the current variations produced by the detector and detected by the central unit. In normal positioning, the current has a low value IB corresponding essentially to the normal consumption of all the sensors. When there is data transmission by the detector, the current can take a high value IH.
  • the data synchronization signal has five periods, t5 to t6, t6 to t7, t7 to t8, t8 to t9, and t9 to t10.
  • the current IL goes from the low state to the high state, then goes down again at time t7 and remains in this state until time t9 where it takes the high value IH between the instants t9 and t10.
  • the rising and falling edges synchronize the variations of the current representative of the data to be transmitted by the detector.
  • the logical value of the data is 1 during periods t5 to t6, t6 to t7, t9 to t10 and 0 between times t7 to t8, t8 to t9, which gives a word of 5 bits equal to 11001. This information is then interpreted by the control unit so as to signal a fire if necessary.
  • a second embodiment, shown in FIG. 6, comprises sequential addressing.
  • the addressing and data synchronization signals are combined on curve 6a.
  • a frame 18 includes rectangular and regular voltage signals.
  • a first detector detects the first rising edge of the frame at an instant t11 and responds on the positive part between instants t11 and t12, and / or on the negative part between instants t12 and t13.
  • a second detector reacts to the second rising edge at an instant t13, while the first detector becomes inactive.
  • instant t15 a third detector reacts and the second does not respond.
  • the operation is identical to each rising edge of the frame for the following detectors.
  • the information provided by the detector may consist of a variation of current, either on 1 bit, or on 2 bits during the positive and negative alternation of the voltage VL.
  • the control unit can receive 4 different messages from each detector.
  • the logic data item 11 between times t15 and t17, representative of a current IL (curve 6b) at the high value IH during the positive and negative values of the voltage VL corresponds to a detector in alarm.
  • Logical data 10 between t11 and t13 indicates the presence of a detector
  • data 01 between t13 and t15 indicates a faulty detector
  • data 00 can indicate an empty address without a detector.
  • a delay during which the voltage VL remains at a constant polarity, allows the detectors to recognize a reset command.
  • the duration of this delay can for example be of the order of one second.
  • any of the detectors can consume current in order to generate an interrupt request at the control panel. This interruption will trigger the start of a new reading phase.
  • the embodiments described above show devices with fire detectors, but the invention can be applied to other types of detectors, for example anti-intrusion detectors.
  • the detectors operating according to the signals of FIGS. 5 and 6 are addressable detectors, although other detectors can be used in particular simple non-addressable wired detectors.
  • the alarm center of FIG. 2 includes a generator 4 of single DC voltage, but it is possible to use two voltage sources: one for the positive voltage and one for the negative voltage.
  • the preferred modes of transmission, described in the example are synchronous, although it is quite possible to use asynchronous modes of transmission.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)
EP95410134A 1994-12-14 1995-11-27 Dispositif de détection et d'alarme Withdrawn EP0717386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9415278 1994-12-14
FR9415278A FR2728373B1 (fr) 1994-12-14 1994-12-14 Dispositif de detection et d'alarme

Publications (1)

Publication Number Publication Date
EP0717386A1 true EP0717386A1 (fr) 1996-06-19

Family

ID=9469954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95410134A Withdrawn EP0717386A1 (fr) 1994-12-14 1995-11-27 Dispositif de détection et d'alarme

Country Status (3)

Country Link
EP (1) EP0717386A1 (no)
FR (1) FR2728373B1 (no)
NO (1) NO955054L (no)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4088983A (en) * 1975-10-28 1978-05-09 Elan Industries, Inc. Electronic polling and calling communication system
US4206449A (en) * 1977-07-27 1980-06-03 American District Telegraph Company Multiple sensor intrusion alarm system
EP0038592A1 (fr) * 1980-04-18 1981-10-28 BEMAC Sprl Société dite Centrale de collecte d'informations et en particulier centrale de détection incendie
EP0158217A1 (de) * 1984-03-26 1985-10-16 Fritz Fuss GmbH & Co. Schaltungsanordnung für eine Gefahrenmeldeanlage
WO1987005731A1 (en) * 1986-03-11 1987-09-24 Tracer Electronics, Inc. Single-wire loop alarm system
US4785285A (en) * 1987-03-18 1988-11-15 Tracer Electronics, Inc. Parallel bus alarm system
EP0564900A1 (en) * 1992-04-09 1993-10-13 Nohmi Bosai Ltd. Fire-alarm system
US5268668A (en) * 1992-01-07 1993-12-07 Detection Systems, Inc. Security/fire alarm system with group-addressing remote sensors

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4088983A (en) * 1975-10-28 1978-05-09 Elan Industries, Inc. Electronic polling and calling communication system
US4206449A (en) * 1977-07-27 1980-06-03 American District Telegraph Company Multiple sensor intrusion alarm system
EP0038592A1 (fr) * 1980-04-18 1981-10-28 BEMAC Sprl Société dite Centrale de collecte d'informations et en particulier centrale de détection incendie
EP0158217A1 (de) * 1984-03-26 1985-10-16 Fritz Fuss GmbH & Co. Schaltungsanordnung für eine Gefahrenmeldeanlage
WO1987005731A1 (en) * 1986-03-11 1987-09-24 Tracer Electronics, Inc. Single-wire loop alarm system
US4785285A (en) * 1987-03-18 1988-11-15 Tracer Electronics, Inc. Parallel bus alarm system
US5268668A (en) * 1992-01-07 1993-12-07 Detection Systems, Inc. Security/fire alarm system with group-addressing remote sensors
EP0564900A1 (en) * 1992-04-09 1993-10-13 Nohmi Bosai Ltd. Fire-alarm system

Also Published As

Publication number Publication date
FR2728373B1 (fr) 1997-01-24
NO955054D0 (no) 1995-12-13
NO955054L (no) 1996-06-17
FR2728373A1 (fr) 1996-06-21

Similar Documents

Publication Publication Date Title
US4613848A (en) Multiple-zone intrusion detection system
JP5275360B2 (ja) 伝送入力回路
JPH0555984A (ja) 電池電圧警報装置
FR2826521A1 (fr) Dispositif de commande radiotelecommandee
FR2563352A1 (fr) Appareil d'alarme avec commande a distance du mode de fonctionnement
EP1672810A1 (fr) Dispositif de commande d'alimentation electrique pour appareils electriques notamment pour candelavres d'eclairage public
JP2002027574A (ja) 二線式遠隔制御システム及び二線式表示装置
EP0717386A1 (fr) Dispositif de détection et d'alarme
CH637779A5 (fr) Detecteur photoelectrique.
JP2722246B2 (ja) 火災報知設備の確認灯電流供給装置
JP3205801B2 (ja) 防災設備の端末のリモコン操作方法及び装置
JP3711466B2 (ja) 火災感知器
JP2001016143A (ja) 差動信号通信異常監視回路
JP3853041B2 (ja) 防災設備の異常検出装置
JP2802757B2 (ja) 火災報知機の試験装置
JPS5845759B2 (ja) カホウケイホウソウチニオケル カサイカンチキカイセンノシユンジドウツウシケンカイロ
JP2603778B2 (ja) 多重伝送システムの端末器
JP2530024B2 (ja) 火災感知器
JP2802012B2 (ja) 防災監視装置
JPH0827874B2 (ja) 火災報知装置
JPH07175982A (ja) 火災感知器
JP2006285502A (ja) 火災感知器、火災受信機および火災報知設備
CN114898582A (zh) 一种智能交通信号灯
JPS586992B2 (ja) 火災感知器の動作検出方式
JP2866490B2 (ja) アドレス付き感知器ベース

Legal Events

Date Code Title Description
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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE CH DE ES GB IT LI SE

17P Request for examination filed

Effective date: 19961125

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: TALCO ALARME - UNIVERSAL DET SA

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: 19990601