JPS554657A - Process control unit - Google Patents

Process control unit

Info

Publication number
JPS554657A
JPS554657A JP7784178A JP7784178A JPS554657A JP S554657 A JPS554657 A JP S554657A JP 7784178 A JP7784178 A JP 7784178A JP 7784178 A JP7784178 A JP 7784178A JP S554657 A JPS554657 A JP S554657A
Authority
JP
Japan
Prior art keywords
digital
value
integrating
switch
manual
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.)
Granted
Application number
JP7784178A
Other languages
Japanese (ja)
Other versions
JPS6156522B2 (en
Inventor
Akira Sumi
Fusatoshi Kataoka
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works 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 Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Hokushin Electric Corp
Priority to JP7784178A priority Critical patent/JPS554657A/en
Publication of JPS554657A publication Critical patent/JPS554657A/en
Publication of JPS6156522B2 publication Critical patent/JPS6156522B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control By Computers (AREA)
  • Feedback Control In General (AREA)

Abstract

PURPOSE: To secure the safety valve control by performing the manual-automatic bumpless switching and the bumpless switching of the proportion gain with application of the position-type operation to the digital operation type process control unit.
CONSTITUTION: The position-type operation is applied to the deviation input signals converted into the digital from through analog comparators 21W26, and the control signals are obtained through the proportion and integration operation. At the same time, the following units are provided: digital microprocessor 1 to perform resetting of the integration value; D/A converter 3 provided at the output side of processor 1; semiconductor switch 4; semiconductor operation switch 7; holding capacitor 6; amplifier 5; and manual-auto change-over switch 8 respectively. And when the control signal exceeds the limit value, the value of capacitor 6 obtained through the integrating operation is fed back to the input side via amplifier 5 to discontinue the integrating operation. Thus, the integrating operation member is made to coincide with the limit value.
COPYRIGHT: (C)1980,JPO&Japio
JP7784178A 1978-06-27 1978-06-27 Process control unit Granted JPS554657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7784178A JPS554657A (en) 1978-06-27 1978-06-27 Process control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7784178A JPS554657A (en) 1978-06-27 1978-06-27 Process control unit

Publications (2)

Publication Number Publication Date
JPS554657A true JPS554657A (en) 1980-01-14
JPS6156522B2 JPS6156522B2 (en) 1986-12-03

Family

ID=13645266

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7784178A Granted JPS554657A (en) 1978-06-27 1978-06-27 Process control unit

Country Status (1)

Country Link
JP (1) JPS554657A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5783802A (en) * 1980-11-14 1982-05-25 Yokogawa Hokushin Electric Corp Process control device
JPS5965591A (en) * 1982-10-08 1984-04-13 Hitachi Ltd water supply device
JPS59140506A (en) * 1983-01-31 1984-08-11 Shimadzu Corp Hybrid controller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5783802A (en) * 1980-11-14 1982-05-25 Yokogawa Hokushin Electric Corp Process control device
JPS5965591A (en) * 1982-10-08 1984-04-13 Hitachi Ltd water supply device
JPS59140506A (en) * 1983-01-31 1984-08-11 Shimadzu Corp Hybrid controller

Also Published As

Publication number Publication date
JPS6156522B2 (en) 1986-12-03

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