EP0562960A1 - Überwachungs- und Alarmvorrichtung für Überwachungs- und Steuerungsanlage - Google Patents

Überwachungs- und Alarmvorrichtung für Überwachungs- und Steuerungsanlage Download PDF

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Publication number
EP0562960A1
EP0562960A1 EP93400763A EP93400763A EP0562960A1 EP 0562960 A1 EP0562960 A1 EP 0562960A1 EP 93400763 A EP93400763 A EP 93400763A EP 93400763 A EP93400763 A EP 93400763A EP 0562960 A1 EP0562960 A1 EP 0562960A1
Authority
EP
European Patent Office
Prior art keywords
equipment
sound
malfunction
alarm
frequency
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Withdrawn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
EP93400763A
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English (en)
French (fr)
Inventor
Jean-Noel Murail
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.)
Cegelec SA
Original Assignee
Cegelec SA
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 Cegelec SA filed Critical Cegelec SA
Publication of EP0562960A1 publication Critical patent/EP0562960A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems

Definitions

  • a monitoring and alarm system for monitoring the operation of equipment comprising one or more detector means each capable of detecting a condition of equipment malfunction, a control arrangement connected to each detector means and an audible indicator for emitting an audible alarm signal to signal at least the appearance of a condition of malfunction of the equipment.
  • a similar monitoring and alarm system is known from European patent application No. 82301785. It is designed for monitoring different protected areas of a room but can be adapted for an industrial control / command installation.
  • control arrangement is arranged to control the audible indicator so that it emits an audible signal upon detection of an alarm condition.
  • a monitoring and alarm system for a control / command installation is that the audible alarm signal is emitted only when a condition of equipment malfunction is detected.
  • a monitoring and alarm system is itself liable to be faulty and therefore incapable of alerting an operator when a detection of an equipment malfunction has occurred.
  • an audible alarm signal emitted suddenly and only in the event of a malfunction of the equipment to be monitored tends to disturb the behavior of the operator who is likely to react under the influence of panic.
  • the object of the invention is to provide a solution to these different problems, by making it possible to signal to the operator, on the one hand, different levels of severity equipment malfunction conditions, and secondly, multiple malfunction conditions occurring at the same time using a single audible indicator.
  • the invention relates to a monitoring and alarm system, characterized in that the control arrangement is arranged to control the sound indicator so that said sound signal is emitted periodically in the event of correct operation or malfunction of the equipment, and in that the sound signal has a sound spectrum, during the emission periods, which consists of a first fixed frequency and a second variable frequency whose value is determined depending on the malfunction condition (s) detected.
  • FIG. 1 schematically represents an embodiment of the monitoring and alarm system according to the invention.
  • Figure 2 is a time diagram illustrating the characteristics of the alarm sound signal.
  • FIG. 1 there is shown an example of implementation of the monitoring and alarm system 7 according to the invention.
  • This monitoring and alarm system can be part of a larger whole of a control / command installation of equipment such as 6 to be monitored.
  • the monitoring and alarm system firstly comprises one or more detectors 5 capable of each detecting a condition of malfunction of the equipment 6. They may, for example, be position, level, variation or other detectors. known per se. In Figure 1, five detectors are shown but it is obvious that a larger number of detectors are usually used in industrial control systems. Each detector 5 produces a detection signal when it detects a condition of equipment malfunction. Each detector 5 is connected to a memory device 4 which on the one hand records alarm information in response to a detection signal supplied by the detector to which it is connected and on the other hand supplies this alarm information to a processing unit 3. The recorded alarm information can subsequently be modified or even erased by the action of an operator who has validated the alarm information.
  • processing unit can correspond to a grouping of detectors by function or organ of the equipment.
  • the memory members 4 can be inputs monitored by a program loaded in a computer.
  • Each processing unit 3 which can be a program loaded into a computer, is arranged to assign to each alarm information item it receives a value representative of an alarm severity level.
  • This severity level value can for example be between 0 and 255.
  • It is also arranged to process the received alarm information and the severity level values associated with each information to provide general alarm information and a value level of general severity.
  • This processing can consist, for example, in finding the alarm information which has the highest level of severity.
  • This processing results in a pair of data which is general alarm information obtained by processing the received alarm information and a general severity level value obtained by processing the severity level values assigned to the alarm information.
  • the processing could also, alternatively, take account of acknowledgment information associated with alarm information transmitted by memory devices.
  • Each processing unit 3 supplies a pair of data (general alarm information, general severity level value) to a sequencer such as 2.
  • sequencer 2 is to control an audible indicator 1 so that the indicator sound periodically emits an audible alarm signal and that this audible signal emitted periodically has a different sound spectrum depending on whether the equipment is faulty or not. If no audible signal is emitted for a period greater than a period of emission of the audible signal, the operator will detect a failure of the monitoring and alarm system.
  • the sound signal can be of the form: sin F1.t + sin F2.t where t is the time, F1 is a first fixed frequency and F2 is a second variable frequency fixed by the sequencer.
  • each sound emission period 8 comprises a succession of sound emission sub-periods S1, S2, S3, each relating to a particular processing unit 3.
  • the sound signal during each sub-period S1, S2, S3 has a sound spectrum consisting of the frequency F1 and a particular frequency F2.
  • the sequencer works as follows. As long as the general severity is not significant of a fault, it fixes for each subsequent sound emission sub-period, the value of the frequency F2 equal to twice the value of the frequency F1.
  • the value of the frequency F2 so that the ratio F2 / F1 is included in the set (1.1; 1.33; 1.5).
  • This ratio can be determined by a table which corresponds to a pair of data (general alarm information, general severity level value) a frequency ratio included in the set previously mentioned.
  • a ratio equal to 1.5 will preferably be chosen for high values of level of general severity (low gravity) and a ratio equal to 1.1 for low values of level of general severity (high gravity). Consequently, the dissonance of the sound signal will be proportional to the severity of the malfunction of the equipment to be monitored.
  • an operator can discriminate three or more types of equipment malfunction to be monitored according to the number of sub-periods that comprise a sound emission period.
  • a period 8 of sound emission with a duration of between 0.2 and 1 second and two consecutive sound emissions are separated by a time interval of between 2 and 30 seconds.
  • the first SI sub-period can have a duration ranging between 0.1 and 0.4 seconds.
  • the second sub-period S2 can have a duration ranging from 0.2 to 0.6 seconds.
  • the third sub-period S3 can have a duration ranging from 0.1 to 0.4 seconds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
EP93400763A 1992-03-27 1993-03-24 Überwachungs- und Alarmvorrichtung für Überwachungs- und Steuerungsanlage Withdrawn EP0562960A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9203726A FR2689279A1 (fr) 1992-03-27 1992-03-27 Appareil de surveillance et d'alarme pour installation de contrôle/commande.
FR9203726 1992-03-27

Publications (1)

Publication Number Publication Date
EP0562960A1 true EP0562960A1 (de) 1993-09-29

Family

ID=9428162

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93400763A Withdrawn EP0562960A1 (de) 1992-03-27 1993-03-24 Überwachungs- und Alarmvorrichtung für Überwachungs- und Steuerungsanlage

Country Status (2)

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EP (1) EP0562960A1 (de)
FR (1) FR2689279A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0063876A1 (de) * 1981-04-16 1982-11-03 EMI Limited Alarmanlage und ein Detektormodul dafür
EP0456080A2 (de) * 1990-05-11 1991-11-13 Siemens Aktiengesellschaft Österreich Verfahren und Schaltungsanordnung zur Anzeige von unterschiedlichen Eingangssignalzuständen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0063876A1 (de) * 1981-04-16 1982-11-03 EMI Limited Alarmanlage und ein Detektormodul dafür
EP0456080A2 (de) * 1990-05-11 1991-11-13 Siemens Aktiengesellschaft Österreich Verfahren und Schaltungsanordnung zur Anzeige von unterschiedlichen Eingangssignalzuständen

Also Published As

Publication number Publication date
FR2689279A1 (fr) 1993-10-01

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