JP2006163588A - Method of converting plant data engineering value and plant monitoring system - Google Patents

Method of converting plant data engineering value and plant monitoring system Download PDF

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JP2006163588A
JP2006163588A JP2004351456A JP2004351456A JP2006163588A JP 2006163588 A JP2006163588 A JP 2006163588A JP 2004351456 A JP2004351456 A JP 2004351456A JP 2004351456 A JP2004351456 A JP 2004351456A JP 2006163588 A JP2006163588 A JP 2006163588A
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Takaaki Oba
貴明 大庭
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Toshiba Mitsubishi Electric Industrial Systems Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To precisely and easily generate an arithmetic expression or engineering value conversion table 7 for converting the whole detection range of a sensor 3 into engineering values when acquiring and converting analog values after detecting the plant data of equipment 2 under monitor. <P>SOLUTION: A measurement instrument 4, connected to the equipment 2 under monitor and calibrated to measure the engineering values of plant data, implements three-point measurement corresponding to the detected analog values respectively within the normal measurable range 11 of the equipment 2 under monitor. Next, based on a plurality of two coordinate values consisting of analog values and measurement engineering values, the instrument 4 finds arithmetic expressions of the first line 16a and second line 16b and obtain an arithmetic expression for transforming the analog values into engineering values for the whole detection range of the sensor 3 by combining these arithmetic expressions. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、プラントデータを工学値に変換してプラント状態の監視する技術に関し、特にプラントデータを工学値に変換する方法、およびそれを用いて監視を行うプラント監視装置に関するものである。   The present invention relates to a technique for converting plant data into an engineering value and monitoring a plant state, and more particularly to a method for converting plant data into an engineering value and a plant monitoring apparatus that performs monitoring using the method.

従来のプラント監視制御装置を以下に示す。
プラントの状態変化量はアナログ値として、プラント側のセンサおよび制御装置などからケーブルを介して周期的に取り込まれる。取り込まれたアナログ値は、Ａ／Ｄ変換部によりカウント値に変換される。カウント値は工学値変換処理部において、工学値に変換されると共に、その工学値が工学値データ保存用データベースに保存される。また、工学値データにノイズの混入が発見されると、ケーブルの処理、アース処理、プラント側の状況、入力波形の確認などを行いノイズ除去を施す。また、ハード処理ができない場合やハード処理をしてもノイズ除去できない場合は、ソフト上で最小二乗法や一次遅れ処理などのスムージング処理により工学値の補正を行っていた（例えば、特許文献１参照）。 A conventional plant monitoring and control apparatus is shown below.
The amount of change in the state of the plant is periodically taken as an analog value from a sensor and a control device on the plant side via a cable. The taken analog value is converted into a count value by the A / D converter. The count value is converted into an engineering value by the engineering value conversion processing unit, and the engineering value is stored in the engineering value data storage database. Also, if noise is found in the engineering value data, cable processing, ground processing, plant-side status, input waveform confirmation, etc. are performed to remove noise. Further, when hardware processing cannot be performed or noise cannot be removed even after hardware processing, engineering values are corrected by a smoothing process such as a least square method or first-order lag processing on the software (see, for example, Patent Document 1). ).

特開平１１−２４９７２８号公報（第２頁）JP-A-11-249728 (2nd page)

上記のような従来のプラント監視において、工学値への変換処理は、例えば、プラントデータを検出するセンサの性能によって決まる公称計測上下限値に基づいて算出される計算式などにより変換されるものであった。しかしながら、監視対象設備の個体差やセンサの誤差などに起因して、得られた工学値にも誤差が生じる。このため、プラントデータの工学値を計測するように校正された計測器を監視対象設備にセンサと並列に接続して、該計測器からの計測値を用いて工学値への変換処理に対する補正を行っていたが、監視対象設備が通常状態の計測範囲以外のデータを実際に計測して補正するのは困難で、信頼性よく工学値変換が行えないという問題点があった。   In the conventional plant monitoring as described above, the conversion process to the engineering value is performed by, for example, a calculation formula calculated based on the upper and lower limits of the nominal measurement determined by the performance of the sensor that detects the plant data. there were. However, due to individual differences in the equipment to be monitored and sensor errors, errors also occur in the obtained engineering values. For this reason, a measuring instrument calibrated to measure the engineering value of the plant data is connected to the monitoring target facility in parallel with the sensor, and the measurement value from the measuring instrument is used to correct the conversion process to the engineering value. However, it has been difficult to actually measure and correct data outside the measurement range of the monitoring target facility, and the engineering value conversion cannot be performed reliably.

この発明は、上記のような問題点を解消するために成されたものであって、センサで検出されるアナログ値のプラントデータを、センサの検出範囲全体において、工学値に変換するための演算式あるいは工学値変換テーブルを精度良く容易に生成できるプラントデータ工学値変換方法を得ることを目的とする。
また、このような工学値変換方法を用いて、監視対象設備のプラントデータ工学値を容易に高精度に取得し、信頼性よくプラント監視を行えるプラント監視装置を得ることを目的とする。 The present invention has been made to solve the above-described problems, and is an operation for converting plant data of analog values detected by a sensor into engineering values over the entire detection range of the sensor. It is an object of the present invention to obtain a plant data engineering value conversion method capable of easily generating a formula or an engineering value conversion table with high accuracy.
It is another object of the present invention to obtain a plant monitoring apparatus that can easily obtain a plant data engineering value of a facility to be monitored with high accuracy by using such an engineering value conversion method and can perform plant monitoring with high reliability.

この発明に係るプラントデータ工学値変換方法は、監視対象設備のプラントデータを検出したアナログ値から工学値に変換する変換方法であって、第１のステップおよび第２ステップを有する。第１ステップでは、上記監視対象設備に接続され上記プラントデータの工学値を計測するように校正された計測器からの計測値を、上記監視対象設備の通常運転状態における計測可能範囲内で、それぞれ検出されたアナログ値あるいは該アナログ値をＡ／Ｄ変換したカウント値と対応させて複数個取得する。第２のステップでは、該アナログ値あるいはカウント値であるデータ値と上記計測値とからなる複数の２次座標値に基づいて、データ値を工学値に変換するための演算式あるいは工学値変換テーブルを生成する。   A plant data engineering value conversion method according to the present invention is a conversion method for converting plant data of a monitoring target facility from an detected analog value to an engineering value, and includes a first step and a second step. In the first step, measured values from measuring instruments connected to the monitored equipment and calibrated to measure engineering values of the plant data are within the measurable range in the normal operation state of the monitored equipment, respectively. A plurality of analog values detected or a count value obtained by A / D converting the analog values are acquired. In the second step, an arithmetic expression or an engineering value conversion table for converting a data value into an engineering value based on a plurality of secondary coordinate values composed of the data value that is the analog value or the count value and the measured value. Is generated.

またこの発明に係るプラント監視装置は、監視対象設備のプラントデータを検出したアナログ値から工学値に変換して該設備の監視を行う装置であり、プラントデータとして検出したアナログ値を入力するアナログ信号入力手段と、アナログ値を工学値に変換するための演算式あるいは工学値変換テーブルを有して上記アナログ信号入力手段にて入力されたアナログ値を工学値に変換する工学値変換手段とを備える。そして、上記演算式あるいは工学値変換テーブルは、上記プラントデータ工学値変換方法にてアナログ値をデータ値として生成されたものである。   Moreover, the plant monitoring apparatus according to the present invention is an apparatus for monitoring the equipment by converting the analog value detected from the plant data of the equipment to be monitored into the engineering value, and inputting the analog value detected as the plant data. An input means, and an engineering value conversion means for converting an analog value input to the analog signal input means into an engineering value having an arithmetic expression or an engineering value conversion table for converting the analog value into an engineering value. . The arithmetic expression or the engineering value conversion table is generated using an analog value as a data value by the plant data engineering value conversion method.

この発明によるプラントデータ工学値変換方法は、プラントデータを工学値として計測するように校正された計測器を用いて、監視対象設備の通常運転状態における計測可能範囲内で工学値である計測値を複数個取得し、該計測値に基づいて工学値に変換するための演算式あるいは工学値変換テーブルを生成するため、センサの検出範囲全体において、工学値変換のための演算式あるいは工学値変換テーブルを精度良く容易に生成できる。
また、この発明によるプラント監視装置は、このような工学値変換方法を用いて、監視対象設備のプラントデータ工学値を容易に高精度に取得できるため、信頼性よくプラント監視を行える。 The plant data engineering value conversion method according to the present invention uses a measuring instrument calibrated to measure plant data as an engineering value, and converts a measured value that is an engineering value within a measurable range in a normal operation state of a monitored facility. An arithmetic expression or engineering value conversion table for converting engineering values in the entire detection range of the sensor in order to generate an arithmetic expression or engineering value conversion table for acquiring a plurality and converting them into engineering values based on the measured values Can be generated accurately and easily.
Moreover, since the plant monitoring apparatus according to the present invention can easily obtain the plant data engineering value of the monitoring target equipment with high accuracy by using such an engineering value conversion method, the plant monitoring apparatus can perform the plant monitoring with high reliability.

実施の形態１．
以下、この発明の実施の形態１について説明する。
図１はこの発明の実施の形態１によるプラント監視装置の概略構成を示したブロック図である。図１に示すように、プラント監視装置１は、監視対象設備２に取り付けられてプラントデータを検出するセンサ３−１〜３−ｎからのデータを取り込んで監視対象設備２を監視する。また、プラント監視装置１は、センサ３−１〜３−ｎからのデータをアナログ値５ａとして取り込むためのアナログ信号入力手段としての信号入力手段５と、該信号入力手段５からのアナログ値５ａを工学値に変換する工学値変換手段６と、工学値変換手段６においてアナログ値５ａを工学値に変換する際に用いるアナログ値−工学値変換テーブル７とを備える。
一方、監視対象設備２には、該設備２のプラントデータの工学値を計測するように設備２の個体差などを考慮して校正された計測器４が、センサ３（３−１〜３−ｎ）と並列に接続される。 Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below.
1 is a block diagram showing a schematic configuration of a plant monitoring apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the plant monitoring apparatus 1 monitors the monitoring target facility 2 by taking in data from sensors 3-1 to 3-n that are attached to the monitoring target facility 2 and detect plant data. Moreover, the plant monitoring apparatus 1 uses the signal input means 5 as an analog signal input means for taking in the data from the sensors 3-1 to 3-n as the analog value 5a, and the analog value 5a from the signal input means 5. An engineering value conversion means 6 for converting into an engineering value, and an analog value-engineering value conversion table 7 used when the engineering value conversion means 6 converts the analog value 5a into an engineering value.
On the other hand, the monitoring target equipment 2 includes a sensor 3 (3-1 to 3−) calibrated in consideration of individual differences of the equipment 2 so as to measure engineering values of plant data of the equipment 2. n) and connected in parallel.

このように構成されるプラント監視装置１では、センサ３からのプラントデータである電流値（例えば４〜２０ｍＡ）または電圧値（例えば１〜５Ｖ）をアナログ値５ａとして取り込み、工学値変換手段６において、予め設定されたアナログ値−工学値変換テーブル７を参照して入力されたアナログ値５ａを工学値に変換する。   In the plant monitoring device 1 configured as described above, a current value (for example, 4 to 20 mA) or a voltage value (for example, 1 to 5 V), which is plant data from the sensor 3, is taken in as an analog value 5a. The analog value 5a input with reference to the preset analog value-engineering value conversion table 7 is converted into an engineering value.

工学値変換手段６での工学値変換に用いるアナログ値−工学値変換テーブル７について以下に説明する。
アナログ値−工学値変換テーブル７は、アナログ値を工学値に変換するための演算式に基づいて生成され、この演算式の生成方法を図２に示すグラフ、および図３に示すフローチャートに基づいて以下に詳述する。なお、プラント監視装置１では、アナログ値−工学値変換テーブル７の替わりに演算式を記憶して工学値変換手段６での工学値変換に用いるようにしても良い。
監視対象設備２に接続された計測器４は、上述したようにプラントデータの工学値を計測するように校正されたものであり、監視対象設備２の通常運転状態における計測可能範囲１１（以下、通常計測可能範囲と称す）内で、３点計測する。この計測値は、それぞれセンサ３からのアナログ値に対応して計測し、この２次座標値（アナログ値、計測値）をアナログ値の昇順に、第１の２次座標値１５ａ、第２の２次座標値１５ｂ、第３の２次座標値１５ｃとする（ステップＳ１）。 The analog value-engineering value conversion table 7 used for engineering value conversion in the engineering value conversion means 6 will be described below.
The analog value-engineering value conversion table 7 is generated based on an arithmetic expression for converting an analog value into an engineering value, and a method for generating the arithmetic expression is based on the graph shown in FIG. 2 and the flowchart shown in FIG. This will be described in detail below. In the plant monitoring device 1, an arithmetic expression may be stored instead of the analog value-engineering value conversion table 7 and used for engineering value conversion in the engineering value conversion means 6.
The measuring instrument 4 connected to the monitoring target facility 2 is calibrated so as to measure the engineering value of the plant data as described above, and the measurable range 11 in the normal operation state of the monitoring target facility 2 (hereinafter referred to as “the monitoring target facility 2”). 3 points are measured within the normal measurement range. The measured values are measured in correspondence with the analog values from the sensor 3, respectively, and the secondary coordinate values (analog values, measured values) are arranged in ascending order of the analog values in the first secondary coordinate value 15a and the second coordinate value. A secondary coordinate value 15b and a third secondary coordinate value 15c are set (step S1).

次に、第２の２次座標値１５ｂを起点として第１の２次座標値１５ａを通る第１の直線１６ａの式を求め、また第２の２次座標値１５ｂを起点として第３の２次座標値１５ｃを通る第２の直線１６ｂの式を求める。この第１の直線１６ａと第２の直線１６ｂとを組み合わせた線を表す式が、横軸のアナログ値を縦軸の工学値に変換する演算式となる。
この演算式の具体的な求め方は、例えば、第１、第２の２次座標値１５ａ、１５ｂ間の変化率と第２、第３の２次座標値１５ｂ、１５ｃ間の変化率とをそれぞれ求めて（ステップＳ２）、第１の直線１６ａと第２の直線１６ｂとの式をそれぞれ求め、センサ３によるアナログ値の検出範囲に基づいて第１の直線１６ａの終点（計測下限値）１７および第２の直線１６ｂの終点（計測上限値）１８も決定する（ステップＳ３）。
アナログ値−工学値変換テーブル７を作成するには、生成された演算式を満足する複数個の２次座標値（アナログ値、計測値）から作成するが、計測下限値１７、計測上限値１８および第２の２次座標値１５ｂを含むように作成するのが望ましい。 Next, an expression of the first straight line 16a passing through the first secondary coordinate value 15a is obtained starting from the second secondary coordinate value 15b, and the second 2nd coordinate value 15b is used as the starting point. The expression of the second straight line 16b passing through the next coordinate value 15c is obtained. An expression representing a line obtained by combining the first straight line 16a and the second straight line 16b is an arithmetic expression for converting an analog value on the horizontal axis into an engineering value on the vertical axis.
A specific method for obtaining this arithmetic expression is, for example, the change rate between the first and second secondary coordinate values 15a and 15b and the change rate between the second and third secondary coordinate values 15b and 15c. Each is obtained (step S2), the expressions of the first straight line 16a and the second straight line 16b are obtained respectively, and the end point (measurement lower limit value) 17 of the first straight line 16a is determined based on the detection range of the analog value by the sensor 3. The end point (measurement upper limit value) 18 of the second straight line 16b is also determined (step S3).
The analog value-engineering value conversion table 7 is created from a plurality of secondary coordinate values (analog values, measurement values) that satisfy the generated arithmetic expression. It is desirable to create the second secondary coordinate value 15b.

なお、第１の２次座標値１５ａは通常計測可能範囲１１の下限値あるいはそれに近いアナログ値における２次座標値、また第３の２次座標値１５ａは通常計測可能範囲１１の上限値あるいはそれに近いアナログ値における２次座標値であることが望ましく、工学値変換のために生成される演算式の信頼性が向上する。   The first secondary coordinate value 15a is the lower limit value of the normal measurable range 11 or a secondary coordinate value at an analog value close thereto, and the third secondary coordinate value 15a is the upper limit value of the normal measurable range 11 or A secondary coordinate value in a close analog value is desirable, and the reliability of an arithmetic expression generated for engineering value conversion is improved.

また、第１〜第３の２次座標値１５ａ〜１５ｃを全て用いて演算式を生成する方法を説明したが、両端の値である第１の２次座標値１５ａと第３の２次座標値１５ｃとを用いて、以下のように演算式を生成しても良い。
図２に示すように、アナログ値の検出範囲に基づいて予め設定された２次座標上下限値としての公称上下限値１３、１２を用い、２次座標値Ａとなる第１の２次座標値１５ａから公称下限値１２に至る第３の直線１９ａの式と、２次座標値Ｂとなる第３の２次座標値１５ｃから公称上限値１３に至る第４の直線１９ｂの式とをそれぞれ求め、これらの組み合わせに基づいて、横軸のアナログ値を縦軸の工学値に変換する演算式を生成する（ステップＳ４）。 Moreover, although the method of producing | generating a computing equation using all the 1st-3rd secondary coordinate values 15a-15c was demonstrated, the 1st secondary coordinate value 15a and the 3rd secondary coordinate which are the values of both ends were demonstrated. An arithmetic expression may be generated using the value 15c as follows.
As shown in FIG. 2, the first secondary coordinates that become the secondary coordinate value A using the nominal upper and lower limit values 13 and 12 as the secondary coordinate upper and lower limit values set in advance based on the detection range of the analog value. An expression of the third straight line 19a from the value 15a to the nominal lower limit value 12 and an expression of the fourth straight line 19b from the third secondary coordinate value 15c, which becomes the secondary coordinate value B, to the nominal upper limit value 13, respectively. Based on these combinations, an arithmetic expression for converting the analog value on the horizontal axis into the engineering value on the vertical axis is generated (step S4).

この場合、通常計測可能範囲１１内の演算式は、上記第３の直線１９ａと第４の直線１９ｂとを互いに交わるまでそれぞれ延長して用いても良いし、通常計測可能範囲１１内に限定して第１の直線１６ａおよび第２の直線１６ｂを用いても良い。前者の場合、ステップＳ１での計測値の計測を２点計測とすることができる。
この場合も、アナログ値−工学値変換テーブル７を作成するには、生成された演算式を満足する複数個の２次座標値（アナログ値、計測値）から作成するが、公称上下限値１３、１２および計測値に基づく２点あるいは３点の２次座標値を含むように作成するのが望ましい。 In this case, the arithmetic expression in the normal measurable range 11 may be used by extending the third straight line 19a and the fourth straight line 19b until they cross each other, or limited to the normal measurable range 11. Alternatively, the first straight line 16a and the second straight line 16b may be used. In the former case, measurement of the measurement value in step S1 can be set to two-point measurement.
In this case as well, in order to create the analog value-engineering value conversion table 7, it is created from a plurality of secondary coordinate values (analog values, measured values) that satisfy the generated arithmetic expression. , 12 and 2 or 3 secondary coordinate values based on the measurement value are preferably included.

以上のように生成された演算式あるいはアナログ値−工学値変換テーブル７は、公称上下限値１３、１２から得られる理論上の演算式が示す直線１４とは異なり、実際の監視対象設備２の個体の実体に合致した工学計測値に基づく信頼性の高いものとなる。また、通常計測可能範囲１１内のみで計測値を取得するため、計測値を容易に取得して、センサの検出範囲全体で用いる演算式あるいはアナログ値−工学値変換テーブル７を容易に生成できると共に、高い精度の必要な通常計測可能範囲１１において、特に高精度な工学値変換が可能となる。
このように、容易で効率的に精度の高い演算式あるいはアナログ値−工学値変換テーブル７が生成でき、このような演算式あるいはアナログ値−工学値変換テーブル７を用いて工学値を取得するプラント監視装置１では、容易に精度の高い工学値を取得しでき、プラント監視の信頼性が向上する。 The arithmetic expression or the analog value-engineering value conversion table 7 generated as described above is different from the straight line 14 indicated by the theoretical arithmetic expression obtained from the nominal upper and lower limit values 13 and 12, and the actual monitoring target equipment 2 It is highly reliable based on engineering measurements that match the entity of the individual. In addition, since the measurement value is acquired only within the normal measurable range 11, the measurement value can be easily acquired, and the arithmetic expression or the analog value-engineering value conversion table 7 used in the entire detection range of the sensor can be easily generated. In particular, it is possible to perform engineering value conversion with particularly high accuracy in the normal measurable range 11 where high accuracy is required.
In this way, an arithmetic expression or analog value-engineering value conversion table 7 with high accuracy can be generated easily and efficiently, and a plant for obtaining an engineering value using such an arithmetic expression or analog value-engineering value conversion table 7 The monitoring device 1 can easily obtain highly accurate engineering values, and the reliability of plant monitoring is improved.

実施の形態２．
上記実施の形態1では、通常計測可能範囲１１外の工学値変換のために求める演算式を、第１の直線１６ａと第２の直線１６ｂとの合成、あるいは第３の直線１９ａと第４の直線１９ｂとの合成としたが、この実施の形態では、通常計測可能範囲１１の下限側の場合と上限側の場合とに分けて、それぞれの場合で選択させるようにした。
この実施の形態においても、アナログ値−工学値変換テーブル７は、アナログ値を工学値に変換するための演算式に基づいて生成され、この演算式の生成方法を図２に示すグラフ、および図４に示すフローチャートに基づいて以下に詳述する。
監視対象設備２に接続され、プラントデータの工学値を計測するように校正された計測器４は、監視対象設備２の通常計測可能範囲１１内で、３点計測する。この計測値は、それぞれセンサ３からのアナログ値に対応して計測し、この２次座標値（アナログ値、計測値）をアナログ値の昇順に、第１の２次座標値１５ａ、第２の２次座標値１５ｂ、第３の２次座標値１５ｃとする（ステップＳＳ１）。 Embodiment 2. FIG.
In the first embodiment, an arithmetic expression obtained for engineering value conversion outside the normal measurable range 11 is obtained by combining the first straight line 16a and the second straight line 16b, or the third straight line 19a and the fourth straight line. In this embodiment, the lower limit side and the upper limit side of the normal measurable range 11 are divided and selected in each case.
Also in this embodiment, the analog value-engineering value conversion table 7 is generated based on an arithmetic expression for converting an analog value into an engineering value, and a method for generating this arithmetic expression is shown in the graph and FIG. This will be described in detail below based on the flowchart shown in FIG.
The measuring instrument 4 connected to the monitoring target facility 2 and calibrated to measure the engineering value of the plant data measures three points within the normal measurable range 11 of the monitoring target facility 2. The measured values are measured in correspondence with the analog values from the sensor 3, respectively, and the secondary coordinate values (analog values, measured values) are arranged in ascending order of the analog values in the first secondary coordinate value 15a and the second coordinate value. A secondary coordinate value 15b and a third secondary coordinate value 15c are set (step SS1).

次に、第１、第３の２次座標値１５ａ、１５ｃ間の変化率Ａを求める（ステップＳＳ２）。この段階から、通常計測可能範囲１１の下限側の場合と上限側の場合とに分けて演算式を生成するが、まず通常計測可能範囲１１の下限側の場合には、第１、第２の２次座標値１５ａ、１５ｂ間の変化率ａ１２と、第１の２次座標値１５ａ、公称下限値１２間の変化率ａＬとをそれぞれ求め（ステップＳＳ３）、変化率ａ１２、変化率Ａの差と変化率ａＬ、変化率Ａの差とをそれぞれの絶対値で比較し（ステップＳＳ４）、等しいか前者が小さい場合、第２の２次座標値１５ｂを起点として第１の２次座標値１５ａを通る第１の直線１６ａの式、およびセンサ３によるアナログ値の検出範囲に基づいて第１の直線１６ａの終点（計測下限値）１７を求める（ステップＳＳ５）。ステップＳＳ４にて、後者が小さい場合は、第１の２次座標値１５ａから公称下限値１２に至る第３の直線１９ａの式を求める（ステップＳＳ６）。これにより、通常計測可能範囲１１の下限側で、第１、第３の２次座標値１５ａ、１５ｃ間の変化率Ａに基づいて、第１、第３の直線１６ａ、１９ａの内、変化率Ａに近い変化率を有するいずれかの直線が選択される。 Next, a change rate A between the first and third secondary coordinate values 15a and 15c is obtained (step SS2). From this stage, the calculation formula is generated separately for the lower limit side and the upper limit side of the normal measurable range 11. First, in the case of the lower limit side of the normal measurable range 11, the first and second The change rate a 12 between the secondary coordinate values 15a and 15b and the change rate a L between the first secondary coordinate value 15a and the nominal lower limit value 12 are obtained (step SS3), and the change rate a 12 and the change rate are obtained. The difference between A, the change rate a L , and the difference between the change rates A are compared with their absolute values (step SS4). If they are equal or smaller, the first 2nd coordinate value 15b is used as the starting point. The end point (measurement lower limit value) 17 of the first straight line 16a is obtained based on the expression of the first straight line 16a passing through the next coordinate value 15a and the detection range of the analog value by the sensor 3 (step SS5). If the latter is smaller in step SS4, an equation of the third straight line 19a from the first secondary coordinate value 15a to the nominal lower limit value 12 is obtained (step SS6). Thereby, on the lower limit side of the normal measurable range 11, the rate of change of the first and third straight lines 16a and 19a based on the rate of change A between the first and third secondary coordinate values 15a and 15c. Any straight line having a rate of change close to A is selected.

また、通常計測可能範囲１１の上限側の場合には、第２、第３の２次座標値１５ｂ、１５ｃ間の変化率ａ２３と、第３の２次座標値１５ｃ、公称上限値１３間の変化率ａＨとをそれぞれ求め（ステップＳＳ７）、変化率ａ２３、変化率Ａの差と変化率ａＨ、変化率Ａの差とをそれぞれの絶対値で比較し（ステップＳＳ８）、等しいか前者が小さい場合、第２の２次座標値１５ｂを起点として第３の２次座標値１５ｃを通る第２の直線１６ｂの式、およびセンサ３によるアナログ値の検出範囲に基づいて第２の直線１６ｂの終点（計測上限値）１８を求める（ステップＳＳ９）。ステップＳＳ８にて、後者が小さい場合は、第３の２次座標値１５ｃから公称上限値１３に至る第４の直線１９ｂの式を求める（ステップＳＳ１０）。これにより、通常計測可能範囲１１の上限側で、第１、第３の２次座標値１５ａ、１５ｃ間の変化率Ａに基づいて、第２、第４の直線１６ｂ、１９ｂの内、変化率Ａに近い変化率を有するいずれかの直線が選択される。 Further, in the case of the upper limit side of the normal measurable range 11, the change rate a 23 between the second and third secondary coordinate values 15b and 15c, and the third secondary coordinate value 15c and the nominal upper limit value 13 determined rate of change a H and respectively (step SS7), compared the change rate a 23, the difference between the change rate a and the change rate a H, a difference in the rate of change a in the respective absolute value (step SS8), equal If the former is small, the second linear coordinate value 15b starts from the second straight line 16b passing through the third secondary coordinate value 15c, and the second detection value is based on the analog value detection range by the sensor 3. An end point (measurement upper limit value) 18 of the straight line 16b is obtained (step SS9). In step SS8, if the latter is small, an equation of the fourth straight line 19b from the third secondary coordinate value 15c to the nominal upper limit value 13 is obtained (step SS10). Thereby, on the upper limit side of the normal measurable range 11, based on the change rate A between the first and third secondary coordinate values 15a and 15c, the change rate of the second and fourth straight lines 16b and 19b. Any straight line having a rate of change close to A is selected.

このようにして、通常計測可能範囲１１の下限側の場合と上限側の場合とに分けて、それぞれの場合で上記変化率Ａに近い変化率を有する直線を選択して、これらの２直線の組み合わせに基づいて、横軸のアナログ値を縦軸の工学値に変換する演算式を生成する。
なお、ステップＳＳ４、ＳＳ８での比較において、両者が等しい場合は、ステップＳＳ５、ＳＳ９に進み第１、第２の直線１６ａ、１６ｂを選択させたが、ステップＳＳ６、ＳＳ１０に進み第３、第４の直線１９ａ、１９ｂを選択させるようにしても良い。 In this way, a straight line having a change rate close to the change rate A in each case is selected separately for the lower limit side and the upper limit side of the normal measurable range 11, and the two straight lines are selected. Based on the combination, an arithmetic expression for converting the analog value on the horizontal axis into the engineering value on the vertical axis is generated.
In the comparison at steps SS4 and SS8, if both are equal, the process proceeds to steps SS5 and SS9 to select the first and second straight lines 16a and 16b. However, the process proceeds to steps SS6 and SS10, and the third and fourth lines. The straight lines 19a and 19b may be selected.

この実施の形態においても、通常計測可能範囲１１内の演算式は、上記選択された２直線を、互いに交わるまでそれぞれ延長して用いても良いし、第１の直線１６ａおよび第２の直線１６ｂを用いても良い。
また、アナログ値−工学値変換テーブル７を作成するには、生成された演算式を満足する複数個の２次座標値（アナログ値、計測値）から作成し、計測下限値１７、計測上限値１８、公称上下限値１３、１２、計測値に基づく３点の２次座標値など、既に決定された値を含むように作成するのが望ましい。 Also in this embodiment, the arithmetic expression in the normal measurable range 11 may be used by extending the selected two straight lines until they intersect each other, or the first straight line 16a and the second straight line 16b. May be used.
Further, in order to create the analog value-engineering value conversion table 7, it is created from a plurality of secondary coordinate values (analog values, measurement values) that satisfy the generated arithmetic expression, and the measurement lower limit value 17, the measurement upper limit value. 18. It is desirable to create the values so as to include already determined values such as nominal upper and lower limit values 13 and 12 and three secondary coordinate values based on the measured values.

以上のように生成された演算式あるいはアナログ値−工学値変換テーブル７は、公称上下限値１３、１２から得られる理論上の演算式が示す直線１４とは異なり、実際の監視対象設備２の個体の実体に合致した工学計測値に基づく信頼性の高いものとなる。また、通常計測可能範囲１１内のみで計測値を取得するため、計測値を容易に取得して、センサの検出範囲全体で用いる演算式あるいはアナログ値−工学値変換テーブル７を容易に生成できると共に、高い精度の必要な通常計測可能範囲１１において、特に高精度な工学値変換が可能となる。また、通常計測可能範囲１１全体の変化率を代表する値である第１、第３の２次座標値１５ａ、１５ｃ間の変化率Ａに基づいて、変化率Ａに近い変化率を有する直線を選択して演算式あるいはアナログ値−工学値変換テーブル７を生成しているため、より精度が高く信頼性の高いものとなる。
このように、容易で効率的に精度の高い演算式あるいはアナログ値−工学値変換テーブル７が生成でき、このような演算式あるいはアナログ値−工学値変換テーブル７を用いて工学値を取得するプラント監視装置１では、容易に精度の高い工学値を取得しでき、プラント監視の信頼性が向上する。 The arithmetic expression or the analog value-engineering value conversion table 7 generated as described above is different from the straight line 14 indicated by the theoretical arithmetic expression obtained from the nominal upper and lower limit values 13 and 12, and the actual monitoring target equipment 2 It is highly reliable based on engineering measurements that match the entity of the individual. In addition, since the measurement value is acquired only within the normal measurable range 11, the measurement value can be easily acquired, and the arithmetic expression or the analog value-engineering value conversion table 7 used in the entire detection range of the sensor can be easily generated. In particular, it is possible to perform engineering value conversion with particularly high accuracy in the normal measurable range 11 where high accuracy is required. Further, a straight line having a change rate close to the change rate A based on the change rate A between the first and third secondary coordinate values 15a and 15c, which is a value representing the change rate of the entire normal measurable range 11. Since the arithmetic expression or the analog value-engineering value conversion table 7 is selected and generated, the accuracy and reliability are higher.
In this way, an arithmetic expression or analog value-engineering value conversion table 7 with high accuracy can be generated easily and efficiently, and a plant for obtaining an engineering value using such an arithmetic expression or analog value-engineering value conversion table 7 The monitoring device 1 can easily obtain highly accurate engineering values, and the reliability of plant monitoring is improved.

実施の形態３．
以下、この発明の実施の形態３について説明する。
図５はこの発明の実施の形態３によるプラント監視装置の概略構成を示したブロック図である。
この実施の形態では、図５に示すように、上記実施の形態１、２で示すプラント監視装置１の内部にアナログ値−工学値変換テーブル生成手段８を備えて、アナログ値−工学値変換テーブル７を生成させる。この場合、プラント監視装置１は、実際にプラントを監視する処理に先立って、アナログ値−工学値変換テーブル生成手段８にてアナログ値−工学値変換テーブル７を生成し、該テーブル７を記憶する。その後、センサ３からのプラントデータをアナログ値５ａとして取り込み、工学値変換手段６において、設定されたアナログ値−工学値変換テーブル７を参照して入力されたアナログ値５ａを工学値に変換する。 Embodiment 3 FIG.
The third embodiment of the present invention will be described below.
5 is a block diagram showing a schematic configuration of a plant monitoring apparatus according to Embodiment 3 of the present invention.
In this embodiment, as shown in FIG. 5, the analog value-engineering value conversion table generating means 8 is provided inside the plant monitoring apparatus 1 shown in the first and second embodiments, and an analog value-engineering value conversion table is provided. 7 is generated. In this case, the plant monitoring apparatus 1 generates an analog value-engineering value conversion table 7 by the analog value-engineering value conversion table generating means 8 prior to the process of actually monitoring the plant, and stores the table 7. . Thereafter, the plant data from the sensor 3 is taken in as an analog value 5a, and the engineering value conversion means 6 converts the input analog value 5a with reference to the set analog value-engineering value conversion table 7 into an engineering value.

アナログ値−工学値変換テーブル生成手段８でアナログ値−工学値変換テーブル７を生成するには、上記実施の形態１、２で示した生成方法を用いるもので、この場合、計測器４が通常計測可能範囲１１内で２点あるいは３点計測した計測値４ａは、計測器４からプラント監視装置１内のアナログ値−工学値変換テーブル生成手段８に入力される。また、この計測値４ａと対応したセンサ３からのアナログ値５ｂは、信号入力手段５を介してプラント監視装置１に入力されてアナログ値−工学値変換テーブル生成手段８に送信される。この後、アナログ値−工学値変換テーブル生成手段８において、取得された２次座標値（アナログ値、計測値）および予め設定されている公称上下限値１３、１２に基づいて、上記実施の形態１、２で示した生成方法によりアナログ値−工学値変換テーブル７を生成する。
これにより、プラント監視装置１内で、人手を介さず自動的にアナログ値−工学値変換テーブル７を生成でき、生成されたアナログ値−工学値変換テーブル７をプラント監視装置１内に保持して工学値変換に用いる。 In order to generate the analog value-engineering value conversion table 7 by the analog value-engineering value conversion table generating means 8, the generation method shown in the first and second embodiments is used. Measurement values 4 a measured at two or three points within the measurable range 11 are input from the measuring instrument 4 to the analog value-engineering value conversion table generating means 8 in the plant monitoring device 1. The analog value 5b from the sensor 3 corresponding to the measured value 4a is input to the plant monitoring apparatus 1 via the signal input means 5 and transmitted to the analog value-engineering value conversion table generating means 8. Thereafter, in the analog value-engineering value conversion table generating means 8, the above embodiment is based on the acquired secondary coordinate values (analog values, measured values) and preset upper and lower limit values 13, 12. The analog value-engineering value conversion table 7 is generated by the generation method indicated by 1 and 2.
Thereby, the analog value-engineering value conversion table 7 can be automatically generated in the plant monitoring apparatus 1 without human intervention, and the generated analog value-engineering value conversion table 7 is held in the plant monitoring apparatus 1. Used for engineering value conversion.

なお、この場合も、アナログ値−工学値変換テーブル生成手段８はアナログ値を工学値に変換するための演算式の生成手段であっても良く、その場合、生成された演算式を保持して工学値変換に用いる。   Also in this case, the analog value-engineering value conversion table generating means 8 may be an arithmetic expression generating means for converting an analog value into an engineering value. In this case, the generated arithmetic expression is held. Used for engineering value conversion.

実施の形態４．
上記実施の形態１〜３では、アナログ値５ａを工学値に変換するものを説明したが、図５に示すように、アナログ値５ａを、Ａ／Ｄ変換手段９によりカウント値９ａに変換した後、カウント値−工学値変換テーブル１０を用いて工学値に変換しても良い。
カウント値−工学値変換テーブル１０は、カウント値９ａを工学値に変換するための演算式に基づいて生成され、この演算式の生成は、上記実施の形態１、２で示した演算式の生成方法の手順で、アナログ値の替わりにアナログ値をＡ／Ｄ変換したカウント値を用いて同様に行うものである。カウント値−工学値変換テーブル１０の替わりに演算式を記憶させて工学値変換に用いても良い。
この場合も、上記実施の形態１、２と同様に容易で効率的に精度の高い演算式あるいはカウント値−工学値変換テーブル１０が生成でき、このような演算式あるいはカウント値−工学値変換テーブル１０を用いて工学値を取得するプラント監視装置１では、容易に精度の高い工学値を取得しでき、プラント監視の信頼性が向上する。 Embodiment 4 FIG.
In the first to third embodiments, the analog value 5a is converted into the engineering value. However, after the analog value 5a is converted into the count value 9a by the A / D conversion means 9 as shown in FIG. Alternatively, it may be converted into an engineering value using the count value-engineering value conversion table 10.
The count value-engineering value conversion table 10 is generated based on an arithmetic expression for converting the count value 9a into an engineering value. The arithmetic expression is generated by the generation of the arithmetic expression shown in the first and second embodiments. In the method procedure, the analog value is A / D converted instead of the analog value, and the same procedure is used. Instead of the count value-engineering value conversion table 10, an arithmetic expression may be stored and used for engineering value conversion.
Also in this case, as in the first and second embodiments, an arithmetic expression or count value-engineering value conversion table 10 can be generated easily and efficiently with high accuracy. Such an arithmetic expression or count value-engineering value conversion table 10 can be generated. In the plant monitoring apparatus 1 that acquires an engineering value using 10, a highly accurate engineering value can be easily acquired, and the reliability of plant monitoring is improved.

この発明の実施の形態１によるプラント監視装置の概略構成を示したブロック図である。It is the block diagram which showed schematic structure of the plant monitoring apparatus by Embodiment 1 of this invention. この発明の実施の形態１による工学値変換の演算式をグラフで説明する図である。It is a figure explaining the arithmetic expression of engineering value conversion by Embodiment 1 of this invention with a graph. この発明の実施の形態１による工学値変換の演算式生成方法を説明するフローチャートである。It is a flowchart explaining the computing equation production | generation method of the engineering value conversion by Embodiment 1 of this invention. この発明の実施の形態２による工学値変換の演算式生成方法を説明するフローチャートである。It is a flowchart explaining the computing equation production | generation method of the engineering value conversion by Embodiment 2 of this invention. この発明の実施の形態３によるプラント監視装置の概略構成を示したブロック図である。It is the block diagram which showed schematic structure of the plant monitoring apparatus by Embodiment 3 of this invention. この発明の実施の形態４によるプラント監視装置の概略構成を示したブロック図である。It is the block diagram which showed schematic structure of the plant monitoring apparatus by Embodiment 4 of this invention.

符号の説明Explanation of symbols

１ プラント監視装置、２ 監視対象設備、３（３−１〜３−ｎ） センサ、
４ 計測器、４ａ 計測工学値、５ アナログ信号入力手段としての信号入力手段、
５ａ，５ｂ アナログ値、６ 工学値変換手段、
７ 工学値変換テーブルとしてのアナログ値−工学値変換テーブル、
９ Ａ／Ｄ変換手段、９ａ カウント値、
１０ 工学値変換テーブルとしてのカウント値−工学値変換テーブル、
１１ 通常計測可能範囲、１２ ２次座標下限値としての公称下限値、
１３ ２次座標上限値としての公称上限値、
１５ａ 第１の２次座標値（２次座標値Ａ）、１５ｂ 第２の２次座標値、
１５ｃ 第３の２次座標値（２次座標値Ｂ）、１６ａ 第１の直線、
１６ｂ 第２の直線、１９ａ 第３の直線、１９ｂ 第４の直線。 1 plant monitoring device, 2 equipment to be monitored, 3 (3-1 to 3-n) sensor,
4 measuring instrument, 4a measurement engineering value, 5 signal input means as analog signal input means,
5a, 5b Analog value, 6 Engineering value conversion means,
7 Analog value-engineering value conversion table as engineering value conversion table,
9 A / D conversion means, 9a count value,
10 Count value-engineering value conversion table as engineering value conversion table,
11 Normal measurable range, 12 Nominal lower limit as secondary coordinate lower limit,
13 Nominal upper limit as secondary coordinate upper limit,
15a first secondary coordinate value (secondary coordinate value A), 15b second secondary coordinate value,
15c third secondary coordinate value (secondary coordinate value B), 16a first straight line,
16b 2nd straight line, 19a 3rd straight line, 19b 4th straight line.

Claims (7)

監視対象設備のプラントデータを検出したアナログ値から工学値に変換するプラントデータ工学値変換方法において、
上記監視対象設備に接続され上記プラントデータを工学値として計測するように校正された計測器からの計測値を、上記監視対象設備の通常運転状態における計測可能範囲内で、それぞれ検出されたアナログ値あるいは該アナログ値をＡ／Ｄ変換したカウント値と対応させて複数個取得する第１のステップと、
該アナログ値あるいはカウント値であるデータ値と上記計測値とからなる複数の２次座標値に基づいて、データ値を工学値に変換するための演算式あるいは工学値変換テーブルを生成する第２のステップとを有することを特徴とするプラントデータ工学値変換方法。 In the plant data engineering value conversion method for converting the plant data of the monitored equipment from the detected analog value to the engineering value,
Measured values from measuring instruments connected to the monitored equipment and calibrated so as to measure the plant data as engineering values are respectively detected analog values within the measurable range in the normal operating state of the monitored equipment. Alternatively, a first step of acquiring a plurality of analog values corresponding to count values obtained by A / D conversion;
A second equation for generating an arithmetic expression or an engineering value conversion table for converting a data value into an engineering value based on a plurality of secondary coordinate values including the data value that is the analog value or the count value and the measured value. A plant data engineering value conversion method. 上記第１のステップにて、上記計測値を３点取得し、該３点の計測値からデータ値の昇順に第１、第２、第３の２次座標値を取得し、上記第２のステップにて、該第２の２次座標値を起点として該第１の２次座標値を通る直線と、該第２の２次座標値を起点として該第３の２次座標値を通る直線とを合成して上記演算式あるいは工学値変換テーブルを生成することを特徴とする請求項１記載のプラントデータ工学値変換方法。 In the first step, three measurement values are acquired, and first, second, and third secondary coordinate values are acquired in ascending order of data values from the three measurement values, and the second In the step, a straight line passing through the first secondary coordinate value starting from the second secondary coordinate value and a straight line passing through the third secondary coordinate value starting from the second secondary coordinate value The plant data engineering value conversion method according to claim 1, wherein the calculation formula or the engineering value conversion table is generated by synthesizing. 上記第１のステップにて、上記計測値を２点取得し、該２点の計測値からデータ値の昇順に２次座標値Ａ、Ｂを取得し、上記第２のステップにて、上記アナログ値の検出範囲に基づいて予め設定された２次座標上下限値を用い、上記２次座標Ａから上記２次座標下限値に至る直線と、上記２次座標値Ｂから上記２次座標上限値に至る直線とを合成して上記演算式あるいは工学値変換テーブルを生成することを特徴とする請求項１記載のプラントデータ工学値変換方法。 In the first step, two points of the measurement value are acquired, and secondary coordinate values A and B are acquired from the two points in ascending order of data values. In the second step, the analog value is acquired. Using a secondary coordinate upper and lower limit value set in advance based on a value detection range, a straight line from the secondary coordinate A to the secondary coordinate lower limit value, and a secondary coordinate value B to the secondary coordinate upper limit value. The plant data engineering value conversion method according to claim 1, wherein the calculation formula or the engineering value conversion table is generated by synthesizing a straight line extending to the point. 上記第１のステップにて、上記計測値を３点取得し、該３点の計測値からデータ値の昇順に第１、第２、第３の２次座標値を取得し、該第１のステップ後、上記第１、第３の２次座標値間の変化率Ａを求め、上記第２のステップにて、上記第２の２次座標値を起点として上記第１の２次座標値を通る第１の直線、上記第２の２次座標値を起点として上記第３の２次座標値を通る第２の直線、上記アナログ値の検出範囲に基づいて予め設定された２次座標上下限値を用いて得られる、上記第１の２次座標値から上記２次座標下限値に至る第３の直線、および上記第３の２次座標値から上記２次座標上限値に至る第４の直線の中から、上記第１の直線あるいは第３の直線のいずれか一の直線、および上記第２の直線あるいは第４の直線のいずれか一の直線を上記変化率Ａに基づいて選択し、該選択された２直線を合成して上記演算式あるいは工学値変換テーブルを生成することを特徴とする請求項１記載のプラントデータ工学値変換方法。 In the first step, three measurement values are acquired, and first, second, and third secondary coordinate values are acquired in ascending order of data values from the three measurement values. After the step, the rate of change A between the first and third secondary coordinate values is obtained, and in the second step, the first secondary coordinate value is determined using the second secondary coordinate value as a starting point. A first straight line passing through, a second straight line passing through the third secondary coordinate value starting from the second secondary coordinate value, and a secondary coordinate upper and lower limit set in advance based on the detection range of the analog value A third straight line from the first secondary coordinate value to the secondary coordinate lower limit value, and a fourth line from the third secondary coordinate value to the secondary coordinate upper limit value obtained using the values. Among the straight lines, either the first straight line or the third straight line, and the second straight line or the fourth straight line 2. The plant data engineering value conversion method according to claim 1, wherein the straight line is selected based on the rate of change A, and the selected two straight lines are synthesized to generate the arithmetic expression or the engineering value conversion table. . 監視対象設備のプラントデータを検出したアナログ値から工学値に変換して該設備の監視を行うプラント監視装置において、プラントデータとして検出したアナログ値を入力するアナログ信号入力手段と、アナログ値を工学値に変換するための演算式あるいは工学値変換テーブルを有して上記アナログ信号入力手段にて入力されたアナログ値を工学値に変換する工学値変換手段とを備え、上記演算式あるいは工学値変換テーブルは、上記請求項１〜４記載のいずれかのプラントデータ工学値変換方法にてアナログ値をデータ値として生成されたものであることを特徴とするプラント監視装置。 In a plant monitoring apparatus that converts the detected analog data from the detected plant data of the equipment to be monitored into an engineering value and monitors the equipment, an analog signal input means for inputting the detected analog value as plant data, and the analog value as the engineering value And an engineering value conversion means for converting an analog value input by the analog signal input means into an engineering value. Is a plant monitoring device generated by using an analog value as a data value by the plant data engineering value conversion method according to any one of claims 1 to 4. 監視対象設備のプラントデータを検出したアナログ値から工学値に変換して該設備の監視を行うプラント監視装置において、プラントデータとして検出したアナログ値を入力するアナログ信号入力手段と、アナログ値をＡ／Ｄ変換してカウント値を出力するＡ／Ｄ変換手段と、カウント値を工学値に変換するための演算式あるいは工学値変換テーブルを有して上記Ａ／Ｄ変換手段にて出力されたカウント値を工学値に変換する工学値変換手段とを備え、上記演算式あるいは工学値変換テーブルは、上記請求項１〜４記載のいずれかのプラントデータ工学値変換方法にてカウント値をデータ値として生成されたものであることを特徴とするプラント監視装置。 In a plant monitoring device for monitoring plant equipment by converting plant data of a facility to be monitored from an analog value detected to an engineering value, an analog signal input means for inputting the analog value detected as plant data, and the analog value as A / The A / D conversion means for D-converting and outputting the count value, and the count value output from the A / D conversion means having an arithmetic expression or engineering value conversion table for converting the count value to the engineering value Engineering value conversion means for converting the value into an engineering value, and the arithmetic expression or the engineering value conversion table generates a count value as a data value by the plant data engineering value conversion method according to any one of claims 1 to 4. A plant monitoring device characterized in that 上記監視対象設備に接続され上記プラントデータを工学値として計測するように校正された計測器からの計測値を入力し、該入力計測値に基づいて上記演算式あるいは工学値変換テーブルを生成する生成部を備え、該生成部にて上記演算式あるいは工学値変換テーブルを生成した後、それを用いて上記工学値変換手段にてデータ値（アナログ値／カウント値）を工学値に変換することを特徴とする請求項５または６記載のプラント監視装置。 Generation that inputs a measured value from a measuring instrument that is connected to the monitored equipment and is calibrated to measure the plant data as an engineering value, and generates the arithmetic expression or the engineering value conversion table based on the input measured value And generating the arithmetic expression or the engineering value conversion table in the generating unit, and then converting the data value (analog value / count value) into the engineering value using the engineering value converting means using the generating equation. The plant monitoring apparatus according to claim 5 or 6, characterized by the above.
JP2004351456A 2004-12-03 2004-12-03 Method of converting plant data engineering value and plant monitoring system Pending JP2006163588A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09146629A (en) * 1995-11-17 1997-06-06 Mitsubishi Electric Corp Trend data collecting/displaying device
JP2002328044A (en) * 2001-05-02 2002-11-15 Hisaka Works Ltd Measuring device
JP2004145846A (en) * 2002-08-27 2004-05-20 Matsushita Electric Works Ltd System for measuring and monitoring environmental state quantity

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09146629A (en) * 1995-11-17 1997-06-06 Mitsubishi Electric Corp Trend data collecting/displaying device
JP2002328044A (en) * 2001-05-02 2002-11-15 Hisaka Works Ltd Measuring device
JP2004145846A (en) * 2002-08-27 2004-05-20 Matsushita Electric Works Ltd System for measuring and monitoring environmental state quantity

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