JPH01147698A - Plant measuring circuit - Google Patents
Plant measuring circuitInfo
- Publication number
- JPH01147698A JPH01147698A JP30337387A JP30337387A JPH01147698A JP H01147698 A JPH01147698 A JP H01147698A JP 30337387 A JP30337387 A JP 30337387A JP 30337387 A JP30337387 A JP 30337387A JP H01147698 A JPH01147698 A JP H01147698A
- Authority
- JP
- Japan
- Prior art keywords
- wiring
- side common
- minus
- loop
- current
- 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
- 238000005259 measurement Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000001131 transforming effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
- Safety Devices In Control Systems (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、鉄鋼、電力、石油化学、上下水道などの各種
プラントから各種変量を計測するプラント計測回路に関
する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a plant measurement circuit that measures various variables from various plants such as steel, electric power, petrochemical, water and sewage plants.
（従来の技術）
各種プラントには、多数のセンサを備えたブランド計測
回路が設けられ、該回路の計測結果に基いて、所定の運
転が行われている。(Prior Art) Various plants are equipped with brand measurement circuits equipped with a large number of sensors, and predetermined operations are performed based on the measurement results of the circuits.
第３図は、従来のプラント計測回路の一例を示す回路部
である。FIG. 3 is a circuit section showing an example of a conventional plant measurement circuit.
これは、各種センサＳＡ、ＳＢ、ＳＣ・・−８Ｎとそれ
ぞれ接続される多数の電流／電圧変換抵抗ｒを収納ユニ
ット１上に配設し、各電流／電圧変換抵抗ｒの一端をマ
イナス（−）測具通線２に接続し、各センサ側の端子か
ら各測定信号を得るようにしたものである。マイナス（
−）測具通線２はマイナス（−）側共通バスパー３と接
続され、センサＳＡ 、ＳＲの電源側端子は、前記マイ
ナス（−）側共通バスパー３との間に介在されたセンサ
電源４のプラス（＋）端子と接続され、又他のセンサＳ
Ｃ・・・ＳＮは、他のセンサ電源５．５と接続されてい
る。A large number of current/voltage conversion resistors r connected to various sensors SA, SB, SC...-8N are arranged on the storage unit 1, and one end of each current/voltage conversion resistor r is connected to the negative (- ) It is connected to the measuring tool line 2, and each measurement signal is obtained from the terminal on each sensor side. minus(
-) The measuring tool line 2 is connected to the negative (-) side common busper 3, and the power supply side terminals of the sensors SA and SR are connected to the sensor power supply 4 interposed between the negative (-) side common busper 3. Connected to the positive (+) terminal and also connected to other sensor S
C...SN are connected to other sensor power supplies 5.5.
上記のプラント計測回路にあっては、各電流／電圧変換
抵抗「に、マイナス（−）側共通配線２に向けて各セン
サＳＡ、Ｓｓ、Ｓｃ・・・ＳＮの検出電流ＩＡ、Ｉａ、
Ｉｃ・・・ＩＮが流され、センサ側の端子ＴＡ、ＴＢ、
ＴＯ，・・・Ｔｎから所定の測定信号が得られる。In the above plant measurement circuit, the detection currents IA, Ia of each sensor SA, Ss, Sc, .
Ic...IN is passed, and the sensor side terminals TA, TB,
A predetermined measurement signal is obtained from TO, . . . Tn.
（発明が解決しようとする問題点）
しかしながら、上記の如き従来よりのプラント計測回路
にあっては、マイナス（−）側共通配線２が単線であっ
たため、ある箇所で（例えば第３図に示すａ点）配線切
断の事故があった場合、その切断箇所以降−の信号ルー
プが全てダウンしてしまうという問題点があった。(Problems to be Solved by the Invention) However, in the conventional plant measurement circuit as described above, since the negative (-) side common wiring 2 is a single wire, there are some points (for example, as shown in FIG. Point a) If there is an accident in which the wiring is cut, there is a problem in that all signal loops after the cut point go down.
プラント運転において信号ループダウンが生じた場合に
は、運転中断を止むなくされたり、誤って計測されたデ
ータにより、種々の不都合を生じるものである。When a signal loop down occurs during plant operation, various inconveniences may occur due to unavoidable interruption of operation or erroneously measured data.
そこで、本発明は、上記問題を改善し、マイナス（−）
側共通配線の断線事故によって信号ループがダウンする
ことがないプラント計測回路を提供することを目的とす
る。Therefore, the present invention improves the above problem and provides negative (-)
It is an object of the present invention to provide a plant measurement circuit in which a signal loop does not go down due to a disconnection accident in side common wiring.
〔発明の構成］
（問題点を解決するための手段）
上記目的を達成する本発明は、プラントの各種センサと
それぞれ接続される多数の電流／電圧変換抵抗を電流／
電圧変換抵抗収納ユニット上に配設し、前記電流／電圧
変換抵抗の一端をマイナス（−）側共通配線に接続し前
記電流／電圧変換抵抗を介して前記センサの測定信号を
得るプラント計測回路において、前記マイナス（−）側
共通配線をループ状に形成したことを特徴とする。[Structure of the Invention] (Means for Solving the Problems) The present invention achieves the above object by converting a large number of current/voltage conversion resistors connected to various sensors of a plant into current/voltage converters.
In a plant measurement circuit disposed on a voltage conversion resistor storage unit, one end of the current/voltage conversion resistor is connected to a negative (-) side common wiring, and a measurement signal of the sensor is obtained via the current/voltage conversion resistor. , the negative (-) side common wiring is formed in a loop shape.
（作用）
本発明では、プラント計測回路のマイナス（−）側共通
配線をループ状に形成したので、ループ切断事故があっ
ても各電流／電圧変換抵抗はマイナス（−）側共通配線
と接続された状態を保つことができるので、信号ループ
がダウンすることがない。(Function) In the present invention, the negative (-) side common wiring of the plant measurement circuit is formed in a loop shape, so even if a loop breakage accident occurs, each current/voltage conversion resistor is connected to the negative (-) side common wiring. The signal loop will never go down.
（実施例）
第１図は本発明の一実施例を示すプラント計測回路の回
路図である。(Embodiment) FIG. 1 is a circuit diagram of a plant measurement circuit showing an embodiment of the present invention.
本例のプラント計測回路は、第３図に示した従来例に対
しマイナス（−）側共通配線２の末端と前記マイナス（
−）側共通バスパー３とを補助配線６で結合し、配線２
と配線６とでマイナス（−）側共通配線をループ状に形
成したものである。図において、第３図に示したものと
同一の参照符号で示す部材は第３図のものと同一の機能
を果す部材である。The plant measurement circuit of this example is different from the conventional example shown in FIG.
−) side common busper 3 with the auxiliary wiring 6, and the wiring 2
and wiring 6 form a negative (-) side common wiring in a loop shape. In the figures, members designated by the same reference numerals as those shown in FIG. 3 are members that perform the same functions as those shown in FIG.
本例では、ループ２，６上での一点、例えばａ点で断線
が生じたしても、以後の回路は配線６を介してマイナス
（−）側共通バスパー３と接続されているので信号測定
ループがダウンすることがない。In this example, even if a disconnection occurs at one point on the loops 2 and 6, for example at point a, the subsequent circuits are connected to the negative (-) side common busper 3 via the wiring 6, so the signal can be measured. The loop never goes down.
第２図は、本発明の他の実施例を示す回路図である。FIG. 2 is a circuit diagram showing another embodiment of the present invention.
本例は、多数の計器７を共通電源線８と共通配線９で接
続し、末端側と電源始端とを補助配線１０で接続し、配
線９と補助配線１０とで電源線をループ状に形成したも
のである。In this example, a large number of meters 7 are connected by a common power supply line 8 and a common wiring 9, the end side and the power supply start end are connected by an auxiliary wiring 10, and the power supply line is formed into a loop shape by the wiring 9 and the auxiliary wiring 10. This is what I did.
本例では、電源線がループ状に形成されるので、ループ
上の一点、例えばｂ点で切断が生じても各計器７の電源
が断たれることがない。In this example, since the power supply line is formed in a loop shape, even if a disconnection occurs at one point on the loop, for example, point b, the power to each meter 7 will not be cut off.
なお、本発明は、上記実施例に限定されるものではなく
、適宜の設計的変更を行うことにより、他の態様でも実
施し得るものである。Note that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments by making appropriate design changes.
［発明の効果］
以上の通り、本発明は、センサのマイナス（−）側共通
配線をループ状に形成したプラント計測回路であるから
、マイナス（−）側共通配線の断線事故によって信号測
定ループがダウンすることがなく、確実に測定信号を得
ることができ、安定したプラント運転が可能となる。[Effects of the Invention] As described above, since the present invention is a plant measurement circuit in which the negative (-) side common wiring of the sensor is formed in a loop shape, the signal measurement loop can be interrupted due to a disconnection accident in the negative (-) side common wiring. There is no downtime, measurement signals can be reliably obtained, and stable plant operation is possible.
第１図は本発明の一実施例を示すプラント計測回路の回
路図、第２図は他の実施例を示す回路図、第３図は従来
例に係るプラント計測回路の回路図である。
１・・・電流／電圧変換抵抗収納ユニット２・・・マイ
ナス（−）側共通配線FIG. 1 is a circuit diagram of a plant measuring circuit showing one embodiment of the present invention, FIG. 2 is a circuit diagram showing another embodiment, and FIG. 3 is a circuit diagram of a conventional plant measuring circuit. 1...Current/voltage conversion resistor storage unit 2...Minus (-) side common wiring
Claims (1)
／電圧変換抵抗を電流／電圧変換抵抗収納ユニット上に
配設し、前記電流／電圧変換抵抗の一端をマイナス（−
）側共通配線に接続し前記電流／電圧変換抵抗を介して
前記センサの測定信号を得るプラント計測回路において
、前記マイナス（−）側共通配線をループ状に形成した
ことを特徴とするプラント計測回路。A large number of current/voltage conversion resistors each connected to various sensors in the plant are arranged on a current/voltage conversion resistor storage unit, and one end of the current/voltage conversion resistor is connected to a negative (-)
) side common wiring and obtains a measurement signal of the sensor via the current/voltage conversion resistor, the plant measuring circuit characterized in that the negative (-) side common wiring is formed in a loop shape. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30337387A JPH01147698A (en) | 1987-12-02 | 1987-12-02 | Plant measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30337387A JPH01147698A (en) | 1987-12-02 | 1987-12-02 | Plant measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01147698A true JPH01147698A (en) | 1989-06-09 |
Family
ID=17920218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30337387A Pending JPH01147698A (en) | 1987-12-02 | 1987-12-02 | Plant measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01147698A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017121725A (en) * | 2016-01-06 | 2017-07-13 | キヤノン株式会社 | Printing element substrate, liquid ejection head, and printing apparatus |
-
1987
- 1987-12-02 JP JP30337387A patent/JPH01147698A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017121725A (en) * | 2016-01-06 | 2017-07-13 | キヤノン株式会社 | Printing element substrate, liquid ejection head, and printing apparatus |
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