JPS58155037U - process control equipment - Google Patents

process control equipment

Info

Publication number
JPS58155037U
JPS58155037U JP5078482U JP5078482U JPS58155037U JP S58155037 U JPS58155037 U JP S58155037U JP 5078482 U JP5078482 U JP 5078482U JP 5078482 U JP5078482 U JP 5078482U JP S58155037 U JPS58155037 U JP S58155037U
Authority
JP
Japan
Prior art keywords
process control
control equipment
analog
converter
types
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
JP5078482U
Other languages
Japanese (ja)
Inventor
津田　勝久
Original Assignee
横河電機株式会社
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 横河電機株式会社 filed Critical 横河電機株式会社
Priority to JP5078482U priority Critical patent/JPS58155037U/en
Publication of JPS58155037U publication Critical patent/JPS58155037U/en
Pending legal-status Critical Current

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  • Control By Computers (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来のアナログ入出力用プロセス制御装置の一
例を示すブロック構成図、第２図はこの考案の一実施例
を示すブロック構成図である。 １・・・・・・マイクロコンピュータ（ＭＰＵ）、’ｌ
・・・・・・ＲＯＭ、３・・・・・・ＲＡＭ、４，５．
６・・叩出力ポート、７・・・・・・入力ポート、８・
・・・・・ＤＡ変換器（ＤＡＣ）、９・・・・・・比較
器、５に、　　６Ｋ・・曲アナログスイッチ、１１Ａ〜
１１Ｃ・・・・・・演算増幅器、１７Ａ、１７Ｂ・・・
・・・定電圧源。FIG. 1 is a block diagram showing an example of a conventional analog input/output process control device, and FIG. 2 is a block diagram showing an embodiment of this invention. 1...Microcomputer (MPU),'l
...ROM, 3...RAM, 4,5.
6... Hitting output port, 7... Input port, 8...
...DA converter (DAC), 9...Comparator, 5, 6K...Song analog switch, 11A~
11C...Operation amplifier, 17A, 17B...
... Constant voltage source.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] プロセス制御系のアナログ入出力信号をマイクロコンピ
ュータにより演算処理し、ＤＡ変換器を介してプロセス
計器等に入出力するようにしたプロセス制御装置におい
て、２種類のアナログ基準信号を形成し、このアナログ
基準信号はＡＤ変換後のディジタル値の各ビットが互い
に反転した値になるようにし、前記２種類のアナログ基
準をＡＤ変換することにより、前記ＤＡ変換器の誤動作
を検出するようにしたことを特徴とするプロセス制御装
置。In a process control device in which analog input/output signals of a process control system are processed by a microcomputer and input/outputted to a process instrument, etc. via a DA converter, two types of analog reference signals are formed, and the analog reference signals are The signal is set so that each bit of the digital value after AD conversion has a mutually inverted value, and the two types of analog standards are AD converted to detect a malfunction of the DA converter. process control equipment.
JP5078482U 1982-04-08 1982-04-08 process control equipment Pending JPS58155037U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5078482U JPS58155037U (en) 1982-04-08 1982-04-08 process control equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5078482U JPS58155037U (en) 1982-04-08 1982-04-08 process control equipment

Publications (1)

Publication Number Publication Date
JPS58155037U true JPS58155037U (en) 1983-10-17

Family

ID=30061566

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5078482U Pending JPS58155037U (en) 1982-04-08 1982-04-08 process control equipment

Country Status (1)

Country Link
JP (1) JPS58155037U (en)

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