JPS58155037U - process control equipment - Google Patents
process control equipmentInfo
- 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
Links
Landscapes
- 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
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)
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.
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) |
-
1982
- 1982-04-08 JP JP5078482U patent/JPS58155037U/en active Pending
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