JPS57212501A - Control system having comparison and safety functions - Google Patents

Control system having comparison and safety functions

Info

Publication number
JPS57212501A
JPS57212501A JP9779881A JP9779881A JPS57212501A JP S57212501 A JPS57212501 A JP S57212501A JP 9779881 A JP9779881 A JP 9779881A JP 9779881 A JP9779881 A JP 9779881A JP S57212501 A JPS57212501 A JP S57212501A
Authority
JP
Japan
Prior art keywords
control system
inputted
water level
control
coincidence
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
JP9779881A
Other languages
Japanese (ja)
Inventor
Takashi Ogura
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9779881A priority Critical patent/JPS57212501A/en
Publication of JPS57212501A publication Critical patent/JPS57212501A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Safety Devices In Control Systems (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

PURPOSE:To elevate safety, by deriving and comparing a water level set value and a control value from an indicated value of a water gauge, by 2 systems of both digital system and analog system, and opening and closing a shielding body for control only in case of coincidence. CONSTITUTION:An indicated value of a water gauge 1', and a water level set value are inputted to a control system 2 of a digital system, and also are inputted to an analog controller 8. An output operated by the control system 2 is inputted to a comparator 7 through a control system 3, an opening limiting circuit 4 and a timer 5. An output of the analog controller 8 is also inputted to the comparator 7, is compared, and only in case of coincidence of both of them, a control signal from the control system 3 is transmitted to a gate 6, and the gate 6 is opened and closed. On the other hand, in case when both signals are not in coincidence, an alarm signal is generated, and a malfuncion of the digital control system is prevented. In this way, opening and closing of the gate can be controlled safely so that a water level does not become smaller than a water level set value.
JP9779881A 1981-06-24 1981-06-24 Control system having comparison and safety functions Pending JPS57212501A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9779881A JPS57212501A (en) 1981-06-24 1981-06-24 Control system having comparison and safety functions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9779881A JPS57212501A (en) 1981-06-24 1981-06-24 Control system having comparison and safety functions

Publications (1)

Publication Number Publication Date
JPS57212501A true JPS57212501A (en) 1982-12-27

Family

ID=14201809

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9779881A Pending JPS57212501A (en) 1981-06-24 1981-06-24 Control system having comparison and safety functions

Country Status (1)

Country Link
JP (1) JPS57212501A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6393002A (en) * 1986-10-08 1988-04-23 Toshiba Corp Sequence controller
JP2010102566A (en) * 2008-10-24 2010-05-06 Mitsubishi Electric Corp Plant operation apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6393002A (en) * 1986-10-08 1988-04-23 Toshiba Corp Sequence controller
JP2010102566A (en) * 2008-10-24 2010-05-06 Mitsubishi Electric Corp Plant operation apparatus

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