JPS5630342A - Fault diagnostic system of decentralized control system - Google Patents

Fault diagnostic system of decentralized control system

Info

Publication number
JPS5630342A
JPS5630342A JP10503679A JP10503679A JPS5630342A JP S5630342 A JPS5630342 A JP S5630342A JP 10503679 A JP10503679 A JP 10503679A JP 10503679 A JP10503679 A JP 10503679A JP S5630342 A JPS5630342 A JP S5630342A
Authority
JP
Japan
Prior art keywords
signal
normal operation
inputted
microprocessor
communication path
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
JP10503679A
Other languages
Japanese (ja)
Other versions
JPS6136261B2 (en
Inventor
Kanman Hamada
Yasuo Kaminaga
Ikuro Masuda
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 JP10503679A priority Critical patent/JPS5630342A/en
Publication of JPS5630342A publication Critical patent/JPS5630342A/en
Publication of JPS6136261B2 publication Critical patent/JPS6136261B2/ja
Granted 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

Abstract

PURPOSE:To make it secure to disconnect a station by improving the detection rate of faults of a microprocessor by making a fault diagnosis by supplying as an interruption signal a signal that shows a change in normal operation signal. CONSTITUTION:Normal operation signal 6 of control station 3 connected by loop- shaped communication path 1 is generated by permitting fault detecting circuit 5 to receive input signal 7 obtained from communication path 1 through photocoupler 9, output signal 8 to communication path 1 and normal operation signal 16 from microprocessor 10 and inputted to relay 4 to put relay contact 4 into operation. Normal operation signal 16 is inputted to one-shot multivibrator 50 and when the signal changes within the time interval determined by the time constant of this circuits, the output signal 17 is held in state ''1'' and then inputted to the terminal IRQ as interruption signal 18 to microprocessor 10.
JP10503679A 1979-08-20 1979-08-20 Fault diagnostic system of decentralized control system Granted JPS5630342A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10503679A JPS5630342A (en) 1979-08-20 1979-08-20 Fault diagnostic system of decentralized control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10503679A JPS5630342A (en) 1979-08-20 1979-08-20 Fault diagnostic system of decentralized control system

Publications (2)

Publication Number Publication Date
JPS5630342A true JPS5630342A (en) 1981-03-26
JPS6136261B2 JPS6136261B2 (en) 1986-08-18

Family

ID=14396777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10503679A Granted JPS5630342A (en) 1979-08-20 1979-08-20 Fault diagnostic system of decentralized control system

Country Status (1)

Country Link
JP (1) JPS5630342A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49109783A (en) * 1973-02-21 1974-10-18
JPS50147855A (en) * 1974-05-17 1975-11-27
JPS5164846A (en) * 1974-12-03 1976-06-04 Fujitsu Ltd

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49109783A (en) * 1973-02-21 1974-10-18
JPS50147855A (en) * 1974-05-17 1975-11-27
JPS5164846A (en) * 1974-12-03 1976-06-04 Fujitsu Ltd

Also Published As

Publication number Publication date
JPS6136261B2 (en) 1986-08-18

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