JPS57206923A - External trouble diagnosing device for process controller - Google Patents

External trouble diagnosing device for process controller

Info

Publication number
JPS57206923A
JPS57206923A JP56090965A JP9096581A JPS57206923A JP S57206923 A JPS57206923 A JP S57206923A JP 56090965 A JP56090965 A JP 56090965A JP 9096581 A JP9096581 A JP 9096581A JP S57206923 A JPS57206923 A JP S57206923A
Authority
JP
Japan
Prior art keywords
signal
circuit
monitoring data
status
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.)
Pending
Application number
JP56090965A
Other languages
Japanese (ja)
Inventor
Eikichi Hotta
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 JP56090965A priority Critical patent/JPS57206923A/en
Publication of JPS57206923A publication Critical patent/JPS57206923A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0751—Error or fault detection not based on redundancy

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Testing And Monitoring For Control Systems (AREA)
  • Test And Diagnosis Of Digital Computers (AREA)

Abstract

PURPOSE:To quickly find a defective position of an external device by finding a point at which the status of a process I/O signal has never been changed during the period from an optional timing to the reference of monitoring data. CONSTITUTION:An input signal IS1 from an external device is outputted to a CPU through an AND circuit 3 by a process I/O address signal AD outputted synchronously with the input of the signal IS1. Simultaneously with the output of signal IS1, an AND circuit 2 is connected by the timing of a clock phi, so that the signal IS1 is inputted to an input data storing element 7. An exlusive OR circuit 5 output monitoring data KD. When the status of the signal IS1 is changed and a monitoring data storing device 6 inputs a logical value ''1'' as the monitoring data KD, the status is self-held by an OR circuit 4. The contents of the monitoring data storing element 6 are sent to the CPU through an AND circuit.
JP56090965A 1981-06-15 1981-06-15 External trouble diagnosing device for process controller Pending JPS57206923A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56090965A JPS57206923A (en) 1981-06-15 1981-06-15 External trouble diagnosing device for process controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56090965A JPS57206923A (en) 1981-06-15 1981-06-15 External trouble diagnosing device for process controller

Publications (1)

Publication Number Publication Date
JPS57206923A true JPS57206923A (en) 1982-12-18

Family

ID=14013205

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56090965A Pending JPS57206923A (en) 1981-06-15 1981-06-15 External trouble diagnosing device for process controller

Country Status (1)

Country Link
JP (1) JPS57206923A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984004610A1 (en) * 1983-05-09 1984-11-22 Fanuc Ltd System for checking abnormality in programmable controller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5377977A (en) * 1976-12-20 1978-07-10 Fuji Electric Co Ltd Information indicator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5377977A (en) * 1976-12-20 1978-07-10 Fuji Electric Co Ltd Information indicator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984004610A1 (en) * 1983-05-09 1984-11-22 Fanuc Ltd System for checking abnormality in programmable controller

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