JPS554644A - Process control unit - Google Patents

Process control unit

Info

Publication number
JPS554644A
JPS554644A JP7749178A JP7749178A JPS554644A JP S554644 A JPS554644 A JP S554644A JP 7749178 A JP7749178 A JP 7749178A JP 7749178 A JP7749178 A JP 7749178A JP S554644 A JPS554644 A JP S554644A
Authority
JP
Japan
Prior art keywords
relay
loss
memory
switched
power supply
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
JP7749178A
Other languages
Japanese (ja)
Inventor
Hisanori Miyagaki
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 JP7749178A priority Critical patent/JPS554644A/en
Publication of JPS554644A publication Critical patent/JPS554644A/en
Pending legal-status Critical Current

Links

Landscapes

  • Safety Devices In Control Systems (AREA)
  • Feedback Control In General (AREA)

Abstract

PURPOSE: To hold the operation signals before the power supply loss for a long period of time to omit the backup battery and thus to facilitate the maintenance by providing the memory to memorize the process operation amount and the nonvolatile memory to hold the operation amount at the time of the power supply loss.
CONSTITUTION: In case the control voltage of power unit 6 is lost, the loss is detected via monitor relay 7. And relay 9 is switched off and electromagnetic value 11 is opened with control valve 12 locked. Nonvolatile memory 24 holds the value of the power voltage before loss. When the voltage is recovered, relay 7 and 9 are switched on. And relay 26 is switched on by the control of relase control circuit 21 of the digital controller to set the contents of memory 24 to analog memory 5. The tie-back signal is compared 22 with the contents of memory 24 through analog input circuit 27-2. And if an coincidence is obtained, relay 25 is switched on via circuit 21 with valve 11 turned on to release the lock of valve 12. As a result, the before-loss state is secured even after the power supply loss for a long time, thus continuing the operation.
COPYRIGHT: (C)1980,JPO&Japio
JP7749178A 1978-06-28 1978-06-28 Process control unit Pending JPS554644A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7749178A JPS554644A (en) 1978-06-28 1978-06-28 Process control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7749178A JPS554644A (en) 1978-06-28 1978-06-28 Process control unit

Publications (1)

Publication Number Publication Date
JPS554644A true JPS554644A (en) 1980-01-14

Family

ID=13635449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7749178A Pending JPS554644A (en) 1978-06-28 1978-06-28 Process control unit

Country Status (1)

Country Link
JP (1) JPS554644A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5969308A (en) * 1982-10-09 1984-04-19 Hitoshi Tokunaga Long distance spiral transport apparatus by means of devided drive
JPS63103102U (en) * 1986-12-22 1988-07-04

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5969308A (en) * 1982-10-09 1984-04-19 Hitoshi Tokunaga Long distance spiral transport apparatus by means of devided drive
JPS63103102U (en) * 1986-12-22 1988-07-04

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