JPS57134712A - Digital controller - Google Patents

Digital controller

Info

Publication number
JPS57134712A
JPS57134712A JP56018155A JP1815581A JPS57134712A JP S57134712 A JPS57134712 A JP S57134712A JP 56018155 A JP56018155 A JP 56018155A JP 1815581 A JP1815581 A JP 1815581A JP S57134712 A JPS57134712 A JP S57134712A
Authority
JP
Japan
Prior art keywords
signal
variable
normal
outputted
failure
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
JP56018155A
Other languages
Japanese (ja)
Inventor
Kazuyuki Nishikawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56018155A priority Critical patent/JPS57134712A/en
Publication of JPS57134712A publication Critical patent/JPS57134712A/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
    • G05B9/03—Safety arrangements electric with multiple-channel loop, i.e. redundant control systems

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Testing And Monitoring For Control Systems (AREA)
  • Safety Devices In Control Systems (AREA)

Abstract

PURPOSE:To increase the reliability of a controller and to improve the plant operating rate, by discriminating failures in two detectors based on two input process variables and an input process variable calculated from an output process variable. CONSTITUTION:A process variable (b) is detected 8, and process variable (a), is detected 3A, 3B and applied to a control variable signal diagnostic section 73. If a detector 3A is in failure and 3B is normal, a switch 74 is switched with an output (k) and a normal signal dB is applied to a control signal generating section 71. At the same time, a normal signal (l) is outputted. In the section 71, a manipulated variable (g) is calculated based on the signal dB and a set signal (f) outputted from a control panel 4 and applied to a controller 2. If the detector 3A is normal and the 3B is in failure, the switch 74 is switched as shown in figure. On the other hand, if the detectors 3A, 3B are both in failure, an abnormal signal (m) is outputted and the manipulated variable (g) is stored to a value immediately before the output of the signal (m), allowing to keep a control signal (h) and the variable (a) constant.
JP56018155A 1981-02-12 1981-02-12 Digital controller Pending JPS57134712A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56018155A JPS57134712A (en) 1981-02-12 1981-02-12 Digital controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56018155A JPS57134712A (en) 1981-02-12 1981-02-12 Digital controller

Publications (1)

Publication Number Publication Date
JPS57134712A true JPS57134712A (en) 1982-08-20

Family

ID=11963719

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56018155A Pending JPS57134712A (en) 1981-02-12 1981-02-12 Digital controller

Country Status (1)

Country Link
JP (1) JPS57134712A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04152401A (en) * 1990-10-17 1992-05-26 Yamatake Honeywell Co Ltd Transmitter containing diagnostic function
JPH04165401A (en) * 1990-10-29 1992-06-11 Sekisui Chem Co Ltd Abnormality detection controller for control valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04152401A (en) * 1990-10-17 1992-05-26 Yamatake Honeywell Co Ltd Transmitter containing diagnostic function
JPH04165401A (en) * 1990-10-29 1992-06-11 Sekisui Chem Co Ltd Abnormality detection controller for control valve

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