JPS57152750A - Abnormality detection system - Google Patents

Abnormality detection system

Info

Publication number
JPS57152750A
JPS57152750A JP56037980A JP3798081A JPS57152750A JP S57152750 A JPS57152750 A JP S57152750A JP 56037980 A JP56037980 A JP 56037980A JP 3798081 A JP3798081 A JP 3798081A JP S57152750 A JPS57152750 A JP S57152750A
Authority
JP
Japan
Prior art keywords
alarm
data
processing devices
loop
transmission
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.)
Pending
Application number
JP56037980A
Other languages
Japanese (ja)
Inventor
Nobuyuki Fujikura
Makoto Nomi
Masaharu Yabushita
Kinji Mori
Shoji Miyamoto
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56037980A priority Critical patent/JPS57152750A/en
Publication of JPS57152750A publication Critical patent/JPS57152750A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To orientate the position of a station, where a fault occurs, in a monitor station, by causing stations, which cannot receive alarm erasing data, to add their own addresses to alarm continuing data and transmit this data onto a loop. CONSTITUTION:If a transmission device N4 becomes faulty, data transmitted from processing devices H1-Hn disappear in the transmission device N4. Consequently, transmission devices except the device N4 output alarm data to respective processing devices. Meanwhile, the processing device H1 which monitors conditions of the whole of the system transmits alarm erasing data onto a loop transmission line L through a transmission device N1 when receiving alarm data. Processing devices which receive alarm erasing data stop the alarm output, and processing devices H5, H6- which do not receive alarm erasing data for a prescribed time add their own addresses to alarm continuing data and transmit this data onto the loop. On a basis of these address values, the processing device H1 discriminates that the processing device N4 is faulty.
JP56037980A 1981-03-18 1981-03-18 Abnormality detection system Pending JPS57152750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56037980A JPS57152750A (en) 1981-03-18 1981-03-18 Abnormality detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56037980A JPS57152750A (en) 1981-03-18 1981-03-18 Abnormality detection system

Publications (1)

Publication Number Publication Date
JPS57152750A true JPS57152750A (en) 1982-09-21

Family

ID=12512709

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56037980A Pending JPS57152750A (en) 1981-03-18 1981-03-18 Abnormality detection system

Country Status (1)

Country Link
JP (1) JPS57152750A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6172445A (en) * 1984-09-04 1986-04-14 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Defect detecting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6172445A (en) * 1984-09-04 1986-04-14 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Defect detecting method
JPH0376620B2 (en) * 1984-09-14 1991-12-06 Intaanashonaru Bijinesu Mashiinzu Corp

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