JPS57139815A - Fault diagnostic device - Google Patents

Fault diagnostic device

Info

Publication number
JPS57139815A
JPS57139815A JP56025893A JP2589381A JPS57139815A JP S57139815 A JPS57139815 A JP S57139815A JP 56025893 A JP56025893 A JP 56025893A JP 2589381 A JP2589381 A JP 2589381A JP S57139815 A JPS57139815 A JP S57139815A
Authority
JP
Japan
Prior art keywords
output
executes
controlled
detector
deciding
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
JP56025893A
Other languages
Japanese (ja)
Inventor
Takehiro Matsubara
Yoshio Inagaki
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56025893A priority Critical patent/JPS57139815A/en
Publication of JPS57139815A publication Critical patent/JPS57139815A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
    • G05B23/0224—Process history based detection method, e.g. whereby history implies the availability of large amounts of data
    • G05B23/0227—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions
    • G05B23/0235—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions based on a comparison with predetermined threshold or range, e.g. "classical methods", carried out during normal operation; threshold adaptation or choice; when or how to compare with the threshold
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
    • G05B23/0267—Fault communication, e.g. human machine interface [HMI]
    • G05B23/0272—Presentation of monitored results, e.g. selection of status reports to be displayed; Filtering information to the user

Abstract

PURPOSE:To easily diagnose which detector has become faulty, by comparing and deciding at least 2 detecting outputs in accordance with a controlled state of a device to be controlled, and a detecting output in accordance with a value to which a controlled variable of said device to be controlled has been set, respectively. CONSTITUTION:When a device to be controlled executes its output in accordance with a set value of a controlled variable setting device, analog signals of a set value detector 13 and the first and second detectors 1, 2 are the same, and digital signals of 3 deciding circuits 6A, 6B and 6C are all the same. Accordingly, all the deciding circuits 6A, 6B and 6C execute no output. Therefore, an interlocking circuit 7 executes an output, AND circuits 8A, 8B execute no output. When he first detector 1 becomes faulty and its signal becomes smaller than the analog signal of the set value detector 13, both the deciding circuits 6C, 6A execute an output. The deciding circuit 6B, however, executes no output. On the other hand, since the interlocking circuit 7 always executes an output, the AND circuit 8A executes an output and the AND circuit 8B executes no output. Accordingly, a display 110 and a printer 120 display the fault of the first detector 1.
JP56025893A 1981-02-23 1981-02-23 Fault diagnostic device Pending JPS57139815A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56025893A JPS57139815A (en) 1981-02-23 1981-02-23 Fault diagnostic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56025893A JPS57139815A (en) 1981-02-23 1981-02-23 Fault diagnostic device

Publications (1)

Publication Number Publication Date
JPS57139815A true JPS57139815A (en) 1982-08-30

Family

ID=12178464

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56025893A Pending JPS57139815A (en) 1981-02-23 1981-02-23 Fault diagnostic device

Country Status (1)

Country Link
JP (1) JPS57139815A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6417863U (en) * 1987-07-24 1989-01-30
JPH0436802A (en) * 1990-05-31 1992-02-06 Shimadzu Corp Process controller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5539948A (en) * 1978-09-12 1980-03-21 Toshiba Corp Malfunction preventing device of control system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5539948A (en) * 1978-09-12 1980-03-21 Toshiba Corp Malfunction preventing device of control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6417863U (en) * 1987-07-24 1989-01-30
JPH0436802A (en) * 1990-05-31 1992-02-06 Shimadzu Corp Process controller

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