JPS57120101A - Process control system - Google Patents

Process control system

Info

Publication number
JPS57120101A
JPS57120101A JP56003812A JP381281A JPS57120101A JP S57120101 A JPS57120101 A JP S57120101A JP 56003812 A JP56003812 A JP 56003812A JP 381281 A JP381281 A JP 381281A JP S57120101 A JPS57120101 A JP S57120101A
Authority
JP
Japan
Prior art keywords
control
controller
operation mode
subject
variation factor
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
JP56003812A
Other languages
Japanese (ja)
Inventor
Yuji Matsuzaki
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Fuji Electric Manufacturing Co 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 Fuji Electric Co Ltd, Fuji Electric Manufacturing Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP56003812A priority Critical patent/JPS57120101A/en
Publication of JPS57120101A publication Critical patent/JPS57120101A/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
    • G05B9/00—Safety arrangements
    • G05B9/02—Safety arrangements electric

Abstract

PURPOSE:To previously prevent the occurrence of an accident at a plant, by switching the automatic operation mode to the manual operation mode for a subject of control in case when some fault is detected from the detection variation factor obtained by a monitor means. CONSTITUTION:This control system comprises a detecting part 31 that detects the process quantity from a subject of control, a controller 32 and an operation terminal 40 that converts the output given from the controller 32 into the operation quantity and influences the subject of control. An input arithmetic part 33 is provided to the controller 32, and the arithmetic output is applied to a control part 35 to perform a PID operation. The result of this operation is applied to the terminal 40 via an automatic-manual changeover part 36. In addition, an arithmetic part 38 a PV variation factor is provided to the controller 32 to calculate the variation factor of the PV value. A monitor switch 39 functions when the output of the part 38 exceeds a prescribed level and drives the part 36 to change the automatic operation mode to the manual operation mode.
JP56003812A 1981-01-16 1981-01-16 Process control system Pending JPS57120101A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56003812A JPS57120101A (en) 1981-01-16 1981-01-16 Process control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56003812A JPS57120101A (en) 1981-01-16 1981-01-16 Process control system

Publications (1)

Publication Number Publication Date
JPS57120101A true JPS57120101A (en) 1982-07-27

Family

ID=11567598

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56003812A Pending JPS57120101A (en) 1981-01-16 1981-01-16 Process control system

Country Status (1)

Country Link
JP (1) JPS57120101A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60235213A (en) * 1984-05-09 1985-11-21 Hitachi Ltd Detection for abnormality of digital control system
JPH01287702A (en) * 1988-05-14 1989-11-20 Mitsubishi Kasei Corp Controller
JPH0620200A (en) * 1992-05-07 1994-01-28 Mitsubishi Electric Corp Trigonometrical survey type range finder and inter-vehicle distance control device
JPH08934U (en) * 1995-11-13 1996-06-07 北陸電気工業株式会社 Small electronic components

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5371762A (en) * 1976-12-06 1978-06-26 Hitachi Ltd Minimum load controller for controlled system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5371762A (en) * 1976-12-06 1978-06-26 Hitachi Ltd Minimum load controller for controlled system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60235213A (en) * 1984-05-09 1985-11-21 Hitachi Ltd Detection for abnormality of digital control system
JPH01287702A (en) * 1988-05-14 1989-11-20 Mitsubishi Kasei Corp Controller
JPH0620200A (en) * 1992-05-07 1994-01-28 Mitsubishi Electric Corp Trigonometrical survey type range finder and inter-vehicle distance control device
JPH08934U (en) * 1995-11-13 1996-06-07 北陸電気工業株式会社 Small electronic components

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