EP0052220A2 - Méthode et dispositif de mesure de résistance dans une ligne de signalisation - Google Patents

Méthode et dispositif de mesure de résistance dans une ligne de signalisation Download PDF

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Publication number
EP0052220A2
EP0052220A2 EP81108038A EP81108038A EP0052220A2 EP 0052220 A2 EP0052220 A2 EP 0052220A2 EP 81108038 A EP81108038 A EP 81108038A EP 81108038 A EP81108038 A EP 81108038A EP 0052220 A2 EP0052220 A2 EP 0052220A2
Authority
EP
European Patent Office
Prior art keywords
capacitor
resistance value
signal line
output
input
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
EP81108038A
Other languages
German (de)
English (en)
Other versions
EP0052220A3 (en
EP0052220B1 (fr
Inventor
Uwe Metzner
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
Priority to AT81108038T priority Critical patent/ATE20982T1/de
Publication of EP0052220A2 publication Critical patent/EP0052220A2/fr
Publication of EP0052220A3 publication Critical patent/EP0052220A3/de
Application granted granted Critical
Publication of EP0052220B1 publication Critical patent/EP0052220B1/fr
Expired 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
    • 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
    • G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance

Definitions

  • the invention relates to a method for measuring the resistance of a signaling line in a hazard alarm system, the individual signaling lines emanating from a control center each have detectors connected in series with a variable resistance value.
  • each detector has a quiescent resistance, which is changed to an alarm resistance when the detector is actuated.
  • the value of the change in resistance can be very different from the total value of the resistance of the signal line.
  • the value of the change in resistance in relation to the total resistance can be very small. It depends on the number of detectors connected in series and the size of the line resistance. This requires a measuring method that can measure and evaluate the relatively small changes in resistance value precisely.
  • the measuring method should remain unaffected by the supply voltage.
  • This object is achieved in that a current is impressed with a series resistor of the signal line and a capacitor which can be connected to the signal line is charged as a function of the resistance value of the line from a constant current, the charging time of the capacitor, which is proportional to the resistance value, being measured and digitized as a measured variable for the resistance value of the signal line for further processing.
  • the measured variable of the resistance value to be measured is thus converted into a time variable proportional to the resistance value, the time being measured. This is done by measuring the charging time of a capacitor that is assigned to the signal line and through which a constant current flows. The time proportional to the resistance to be measured is measured digitally.
  • the capacitor is expediently short-circuited and thus discharged before the measurement begins.
  • a switch or a transistor can be provided, which is connected in parallel to the capacitor.
  • the switch is opened so that the capacitor is charged with the constant current.
  • the charging time of the capacitor is measured by supplying pulses from a clock generator via an AND gate to a downstream counting device for this time. If the capacitor is charged, the AND gate is blocked and no further pulses can be fed to the counting device.
  • the end of the charging time of the capacitor can advantageously be determined using a comparison circuit.
  • This comparison circuit has two inputs and one output which emits a stop signal to the AND gate at the end of the charging time of the capacitor. This stop signal is emitted when the capacitor voltage at the input of the comparison circuit and the line voltage are in a predetermined ratio to each other.
  • the resistance value of the respective line can be measured in an advantageous manner by cyclically querying the individual signal line.
  • the measuring device can be designed so that each signal line is assigned its own series resistor. It is also possible to design the measuring device in such a way that a single series resistor is provided, which is then connected to the individual signal lines during the cyclical interrogation.
  • a device for performing the method is to be explained in more detail below with the aid of circuit examples.
  • FIG. 1 shows a control center Z with a plurality of signaling lines ML1 to MLn.
  • Each signal line ML has a resistor RX1 to RXn.
  • RX1 resistor
  • M1 to Mn are shown, which are connected in series. If a detector, for example M1, is in the idle state, the detector M1 has an idle resistor RR1. If the detector M1 responds, the Contact K1 the detector Ml. switched to alarm resistor RA1.
  • a relatively small absolute change in resistance for example RR1-RA1, is to be measured and evaluated in the center Z.
  • the circuit arrangement shows the resistance RX to be measured of the signal line ML.
  • This resistor RX is connected to the supply voltage UV via the series resistor RV.
  • the capacitor C is connected to one electrode at the positive pole (+) of the direct voltage source UV and to the other electrode at the collector of the transistor TR and at the first input B3 of the comparator D3.
  • the emitter of the transistor TR is connected via a first resistor RI to the negative pole (-) of the direct voltage source UV.
  • the second input A3 of the comparator D3 is connected to the output of a first amplifier D1. Its first input A1 is connected to the common connection point X of the measuring resistor RX of the signal line ML and the series resistor RV.
  • the second input B1 of the first amplifier D1 is connected to the output of the amplifier D1, which is connected to the negative pole (-) of the direct voltage source UV via the series connection of the two resistors R1 and R2.
  • the common connection point Y of the series connection of the two resistors R1 and R2 leads to the first input A2 of a second amplifier D2.
  • the second input B2 of the second amplifier D2 leads to the emitter of the transistor TR.
  • the output of the second amplifier D2 is connected to the base of the transistor TR.
  • a switch S is connected in parallel with the chargeable capacitor C.
  • the voltage UL on the signal line is in a certain relationship to the voltage UC on the capacitor C and the supply voltage UV.
  • the tension between the The negative pole (-) of the direct voltage source UV and the second input B3 of the comparator D3 is indicated by UB, the voltage present at the first input A3 of the comparator D3 is indicated by UA. Furthermore, the output of the comparator D3 is routed to the first input of an AND gate G. A clock generator TG is connected to the second input of the AND gate G. The output of the AND gate G leads to a counting device ZV.
  • the capacitor C is discharged.
  • the measurement of the resistance value RX of the line ML is started when the switch S is opened.
  • the capacitor C is charged with the constant current I.
  • the comparator D3 outputs a stop signal STO to the AND gate G. This means that the AND gate G is no longer acted on by a signal, so that the pulses of the clock generator TG can no longer reach the counting device ZV.
  • the charging time T of the capacitor C is directly proportional to the measured value of the resistor RX and is independent of the supply voltage UV. Since the supply voltage UV is in a certain relationship to the line voltage UL and thus to the capacitor voltage UC, the charging time T of the capacitor C can be measured relatively easily with this circuit arrangement.
  • UA UB
  • FIG. 3 shows only a part of the original circuit according to FIG.
  • the switch S according to FIG. 2 which is connected in parallel to the capacitor C, is replaced by a transistor STR.
  • the transistor STR is connected in parallel with the capacitor C with its collector-emitter circuit.
  • the base of the transistor STR is connected via a further resistor R3 to the negative pole (-) of the supply voltage UV and to an optocoupler OK2.
  • the optocoupler 0K2 is used for the electrical isolation of the actual measuring device or measuring circuit from the other evaluation device of the control center.
  • a start signal STA for the measurement can take place via the optocoupler 0K2, so that the transistor STR, which has short-circuited the capacitor C, is then opened.
  • the output signal of the comparator D3 is also passed to a further optocoupler OK1 via a further resistor R4, so that here too, galvanically isolated, the Stop signal STO reaches the downstream AND gate G. This is followed by the counting device ZV.
  • a particular advantage of such a resistance measuring arrangement is obtained if this measuring arrangement is provided only once in a control center and measures the resistance values of the respective signal lines in rapid succession.
  • a measuring point switch MU as shown in FIG. 4, can be provided for this purpose.
  • the measuring point switch MU is connected in turn to the respective signal lines ML1 to MLn, which are symbolized here with the resistors RX1 to RXn.
  • a series resistor RV1 to RVn is assigned to the respective signal lines ML1 to MLn. It is expedient to carry out a cyclical interrogation with a multiplex switching device which is controlled by a microprocessor.
  • the start and stop signals' STA, STO for example via optocouplers OK1.2, are sent from a microprocessor to the measuring circuit or from the measuring circuit to the microcomputer.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Fire Alarms (AREA)
EP81108038A 1980-11-17 1981-10-07 Méthode et dispositif de mesure de résistance dans une ligne de signalisation Expired EP0052220B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81108038T ATE20982T1 (de) 1980-11-17 1981-10-07 Verfahren und vorrichtung zur widerstandsmessung an einer meldeleitung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3043357A DE3043357C2 (de) 1980-11-17 1980-11-17 Verfahren und Vorrichtung zur Widerstandsmessung an einer Meldeleitung
DE3043357 1980-11-17

Publications (3)

Publication Number Publication Date
EP0052220A2 true EP0052220A2 (fr) 1982-05-26
EP0052220A3 EP0052220A3 (en) 1982-09-29
EP0052220B1 EP0052220B1 (fr) 1986-07-23

Family

ID=6117002

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108038A Expired EP0052220B1 (fr) 1980-11-17 1981-10-07 Méthode et dispositif de mesure de résistance dans une ligne de signalisation

Country Status (3)

Country Link
EP (1) EP0052220B1 (fr)
AT (1) ATE20982T1 (fr)
DE (1) DE3043357C2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0125011A1 (fr) * 1983-04-08 1984-11-14 John Malcolm Morrison Système d'alarme contre le vol avec effraction
EP0529139A1 (fr) * 1991-08-30 1993-03-03 Siemens Aktiengesellschaft Procédé de transmission de données binaires dans un système de signalisation d'alarmes
EP0529140A1 (fr) * 1991-08-30 1993-03-03 Siemens Aktiengesellschaft Procédé de transmission de données binaires dans un système de signalisation d'alarmes
DE10051329C2 (de) * 2000-10-10 2003-12-11 Job Lizenz Gmbh & Co Kg Gefahrenmeldeanlage
WO2006136494A1 (fr) * 2005-06-23 2006-12-28 Nokia Siemens Networks Gmbh & Co. Kg Procede et dispositif pour determiner la resistance de fuite d'au moins un conducteur d'une ligne de raccordement d'abonne presentant plusieurs conducteurs dans un reseau de communication
CN110927465A (zh) * 2019-11-26 2020-03-27 深圳供电局有限公司 直流电阻测量电路及装置
CN113433391A (zh) * 2021-06-18 2021-09-24 哈尔滨工业大学（深圳） 实现远端电压精确控制的电路、方法、系统及存储介质

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE402660B (sv) * 1970-11-12 1978-07-10 Securitas Int Ab Brandalarmanleggning
US3916405A (en) * 1973-03-07 1975-10-28 Motohiro Gotanda System for supervision of rooms or buildings
DE2716506A1 (de) * 1977-04-14 1978-10-19 Dieter Eberhard Vorrichtung zur bestimmung des alarmausloeseortes in alarmanlagen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0125011A1 (fr) * 1983-04-08 1984-11-14 John Malcolm Morrison Système d'alarme contre le vol avec effraction
EP0529139A1 (fr) * 1991-08-30 1993-03-03 Siemens Aktiengesellschaft Procédé de transmission de données binaires dans un système de signalisation d'alarmes
EP0529140A1 (fr) * 1991-08-30 1993-03-03 Siemens Aktiengesellschaft Procédé de transmission de données binaires dans un système de signalisation d'alarmes
DE10051329C2 (de) * 2000-10-10 2003-12-11 Job Lizenz Gmbh & Co Kg Gefahrenmeldeanlage
EP1197936B2 (fr) † 2000-10-10 2008-05-14 Job Lizenz GmbH & Co. KG Système d'alarme
WO2006136494A1 (fr) * 2005-06-23 2006-12-28 Nokia Siemens Networks Gmbh & Co. Kg Procede et dispositif pour determiner la resistance de fuite d'au moins un conducteur d'une ligne de raccordement d'abonne presentant plusieurs conducteurs dans un reseau de communication
CN101248654B (zh) * 2005-06-23 2012-01-11 诺基亚西门子通信有限责任两合公司 用于在通信网络中确定具有多个导线的用户连接线路的至少一个导线的泄漏电阻的方法与装置
US8358743B2 (en) 2005-06-23 2013-01-22 Nokia Siemens Networks Gmbh & Co. Kg Method and device for determining the leakage resistance of at least one wire of a subscriber line having a number of wires in a communication network
CN110927465A (zh) * 2019-11-26 2020-03-27 深圳供电局有限公司 直流电阻测量电路及装置
CN113433391A (zh) * 2021-06-18 2021-09-24 哈尔滨工业大学（深圳） 实现远端电压精确控制的电路、方法、系统及存储介质
CN113433391B (zh) * 2021-06-18 2023-02-03 哈尔滨工业大学（深圳） 实现远端电压精确控制的电路、方法、系统及存储介质

Also Published As

Publication number Publication date
EP0052220A3 (en) 1982-09-29
DE3043357C2 (de) 1985-01-17
ATE20982T1 (de) 1986-08-15
EP0052220B1 (fr) 1986-07-23
DE3043357A1 (de) 1982-06-03

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