JPS57161901A - Plant control device - Google Patents

Plant control device

Info

Publication number
JPS57161901A
JPS57161901A JP4645981A JP4645981A JPS57161901A JP S57161901 A JPS57161901 A JP S57161901A JP 4645981 A JP4645981 A JP 4645981A JP 4645981 A JP4645981 A JP 4645981A JP S57161901 A JPS57161901 A JP S57161901A
Authority
JP
Japan
Prior art keywords
stations
communication
signal
local station
station
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
JP4645981A
Other languages
Japanese (ja)
Inventor
Kanman Hamada
Norihiko Sugimoto
Ikuro Masuda
Jinichi Sakurai
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 JP4645981A priority Critical patent/JPS57161901A/en
Priority to US06/335,689 priority patent/US4500951A/en
Publication of JPS57161901A publication Critical patent/JPS57161901A/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
    • G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
    • 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
    • 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
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
    • G06F11/202—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant
    • G06F11/2023—Failover techniques
    • G06F11/2033—Failover techniques switching over of hardware resources

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Quality & Reliability (AREA)
  • Computer Hardware Design (AREA)
  • Automation & Control Theory (AREA)
  • Safety Devices In Control Systems (AREA)

Abstract

PURPOSE:To obtain a control device which has a high reliability and is superior in extensibility and is easily made into an LSI, by providing common interface circuits and self-diagnostic circuits in controller stations and display stations respectively and performing specific operations in these circuits. CONSTITUTION:Controller stations 1 and 2 for the control of one loop and a display station 5, which incorporate computers respectively, and loop dual communication lines 7, through which equal communication is performed among these stations sequentially, connecting these stations are provided. A common self-diagnostic circuit 12 and a communication interface circuit 11 are provided in each station; and under the contro of the incroporated computer, the self- diagnostic circuit 12 disconnects the local station from the communication lines 7 and by-passes the communication signal when the local station becomes faulty. The communication interface circuit 11 selects one of communication lines 7 to take in the signal on this selected line as an input signal when the local station is normal, and the signal generated in the local station or the selected input signal is delayed as required to obtain an output signal.
JP4645981A 1981-01-07 1981-03-31 Plant control device Pending JPS57161901A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP4645981A JPS57161901A (en) 1981-03-31 1981-03-31 Plant control device
US06/335,689 US4500951A (en) 1981-01-07 1981-12-30 Plant control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4645981A JPS57161901A (en) 1981-03-31 1981-03-31 Plant control device

Publications (1)

Publication Number Publication Date
JPS57161901A true JPS57161901A (en) 1982-10-05

Family

ID=12747739

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4645981A Pending JPS57161901A (en) 1981-01-07 1981-03-31 Plant control device

Country Status (1)

Country Link
JP (1) JPS57161901A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013025358A (en) * 2011-07-15 2013-02-04 Yokogawa Electric Corp Field communication system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5614302A (en) * 1979-07-13 1981-02-12 Hitachi Ltd Process control system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5614302A (en) * 1979-07-13 1981-02-12 Hitachi Ltd Process control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013025358A (en) * 2011-07-15 2013-02-04 Yokogawa Electric Corp Field communication system

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