JPS6459401A - Deep layer protection type controller - Google Patents

Deep layer protection type controller

Info

Publication number
JPS6459401A
JPS6459401A JP21551987A JP21551987A JPS6459401A JP S6459401 A JPS6459401 A JP S6459401A JP 21551987 A JP21551987 A JP 21551987A JP 21551987 A JP21551987 A JP 21551987A JP S6459401 A JPS6459401 A JP S6459401A
Authority
JP
Japan
Prior art keywords
control
controllers
accordance
controller
plural
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
JP21551987A
Other languages
Japanese (ja)
Inventor
Hideyuki Sato
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 JP21551987A priority Critical patent/JPS6459401A/en
Publication of JPS6459401A publication Critical patent/JPS6459401A/en
Pending legal-status Critical Current

Links

Landscapes

  • Safety Devices In Control Systems (AREA)
  • Selective Calling Equipment (AREA)

Abstract

PURPOSE:To form the constitution of a control system as a deep layer, and to secure the safety of a plant by selecting an output of plural sets of independent controllers for sharing and executing plural control functions, in accordance with a priority of the control function, and outputting it as a control signal. CONSTITUTION:In a control system, the titled controller is constituted so that plural different control functions operated hierarchically in accordance with a state of a control object are shared by plural sets of independent controllers 4-1-4-4, and by an output part 16 provided separately, an output of these controllers is selected in accordance with a priority of the control function and outputted as a control signal. Since the controllers 4-1-4-4 are independent in each separate function, even if a fault is generated in a partial controller,a control of a different hierarchy by other controller is executed. In such a way, the system-down caused by a common event (common mode), can be prevented, and the safety and the reliability of a plant can be raised.
JP21551987A 1987-08-31 1987-08-31 Deep layer protection type controller Pending JPS6459401A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21551987A JPS6459401A (en) 1987-08-31 1987-08-31 Deep layer protection type controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21551987A JPS6459401A (en) 1987-08-31 1987-08-31 Deep layer protection type controller

Publications (1)

Publication Number Publication Date
JPS6459401A true JPS6459401A (en) 1989-03-07

Family

ID=16673758

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21551987A Pending JPS6459401A (en) 1987-08-31 1987-08-31 Deep layer protection type controller

Country Status (1)

Country Link
JP (1) JPS6459401A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008040998A (en) * 2006-08-10 2008-02-21 Yokogawa Electric Corp Safe instrumentation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008040998A (en) * 2006-08-10 2008-02-21 Yokogawa Electric Corp Safe instrumentation system
US8024053B2 (en) 2006-08-10 2011-09-20 Yokogawa Electric Corporation Safety instrumentation system and plant safety system

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