JP2000076578A - Abnormality detection method and device in dual instrumentation - Google Patents
Abnormality detection method and device in dual instrumentationInfo
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- JP2000076578A JP2000076578A JP10243292A JP24329298A JP2000076578A JP 2000076578 A JP2000076578 A JP 2000076578A JP 10243292 A JP10243292 A JP 10243292A JP 24329298 A JP24329298 A JP 24329298A JP 2000076578 A JP2000076578 A JP 2000076578A
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、二重化計装におけ
る異常検出方法及び装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting an abnormality in dual instrumentation.
【0002】[0002]
【従来の技術】一般に、ボイラプラント等におけるプロ
セス制御においては、プロセス値としての計測値の計測
の信頼性を高めるために、計測器を二重化する、いわゆ
る二重化計装とすることがある。2. Description of the Related Art In general, in a process control in a boiler plant or the like, a so-called dual instrumentation is sometimes used in which a measuring instrument is duplicated in order to increase the reliability of measurement of a measured value as a process value.
【0003】図3は従来の二重化計装の一例を表わすも
のであって、1はボイラプラント等における温度、圧
力、流量等の物理量を計測するための第一計測器、2は
第一計測器1と同一の物理量を計測するための第二計測
器であり、前記第一計測器1で計測された計測信号3と
前記第二計測器2で計測された計測信号4の偏差の絶対
値が設定値を越えた場合(計測信号3をY1、計測信号
4をY2、設定値をαとすると|Y1−Y2|>αとな
った場合)に、「1」の信号5を出力する偏差モニタス
イッチ6と、該偏差モニタスイッチ6から出力される信
号5が「1」の場合に異常が発生したとして警報を発す
る警報装置7と、通常時にはb側に切り換えられ第一計
測器1で計測された計測信号3を出力信号8として制御
回路へ出力する一方、警報装置7から警報が発せられ、
第一計測器1の異常が確認された場合には運転員によっ
て手動でa側に切り換えられ、第二計測器2で計測され
た計測信号4を出力信号8として制御回路へ出力する切
換器9とを設けてある。FIG. 3 shows an example of a conventional dual instrumentation system, in which 1 is a first measuring device for measuring physical quantities such as temperature, pressure, flow rate and the like in a boiler plant or the like, and 2 is a first measuring device. 1 is a second measuring device for measuring the same physical quantity as that of the first measuring device, and the absolute value of the deviation between the measurement signal 3 measured by the first measuring device 1 and the measurement signal 4 measured by the second measuring device 2 A deviation monitor that outputs a signal 1 of "1" when the set value is exceeded (| Y1-Y2 |> α, where Y1 is the measurement signal 3, Y2 is the measurement signal 4, and α is the set value). A switch 6, an alarm device 7 that issues an alarm when a signal 5 output from the deviation monitor switch 6 is “1”, and an alarm that issues an alarm when an abnormality has occurred. While outputting the measured signal 3 as an output signal 8 to the control circuit. An alarm is issued from the alarm device 7,
When an abnormality of the first measuring instrument 1 is confirmed, the operator manually switches to the a side, and outputs a measurement signal 4 measured by the second measuring instrument 2 as an output signal 8 to the control circuit 9. Are provided.
【0004】図3に示される如き従来の二重化計装にお
いては、ボイラプラント等における温度、圧力、流量等
の物理量が第一計測器1と第二計測器2とによって同時
に計測され、前記第一計測器1で計測された計測信号3
(Y1)と前記第二計測器2で計測された計測信号4
(Y2)の偏差の絶対値(|Y1−Y2|)が偏差モニ
タスイッチ6において設定値(α)と比較され、計測信
号3と計測信号4とが極端に異なる値となっていない場
合、即ち|Y1−Y2|≦αとなっている場合には、偏
差モニタスイッチ6から出力される信号5は「0」のま
まであって、警報装置7から警報は発せられず、切換器
9はb側に切り換えられたまま保持され、第一計測器1
で計測された計測信号3が出力信号8として制御回路へ
出力される。In a conventional dual instrumentation as shown in FIG. 3, physical quantities such as temperature, pressure, flow rate and the like in a boiler plant or the like are simultaneously measured by a first measuring instrument 1 and a second measuring instrument 2, and the first Measurement signal 3 measured by measuring instrument 1
(Y1) and the measurement signal 4 measured by the second measuring device 2
The absolute value (| Y1-Y2 |) of the deviation of (Y2) is compared with the set value (α) by the deviation monitor switch 6, and when the measurement signal 3 and the measurement signal 4 are not extremely different values, that is, If | Y1−Y2 | ≦ α, the signal 5 output from the deviation monitor switch 6 remains “0”, no alarm is issued from the alarm device 7, and the switch 9 is set to b. The first measuring instrument 1 is held while being switched to the
Is output as an output signal 8 to the control circuit.
【0005】これに対し、第一計測器1と第二計測器2
のいずれかが何らかの原因で故障する等して異常が発生
し、前記第一計測器1で計測された計測信号3と前記第
二計測器2で計測された計測信号4の偏差の絶対値が設
定値を越えた場合、即ち|Y1−Y2|>αとなった場
合には、偏差モニタスイッチ6から「1」の信号5が警
報装置7へ出力され、該警報装置7から警報が発せら
れ、ここで、第一計測器1の異常が確認された場合に
は、切換器9が運転員によって手動でa側に切り換えら
れ、第二計測器2で計測された計測信号4が出力信号8
として制御回路へ出力され、この後、第一計測器1の修
理等が行われ、又、第二計測器2の異常が確認された場
合には、切換器9は通常時と同様に、b側に切り換えら
れたまま保持され、第一計測器1で計測された計測信号
3が出力信号8として制御回路へ出力され、この後、第
二計測器2の修理等が行われる。On the other hand, a first measuring device 1 and a second measuring device 2
An abnormality occurs due to a failure of any of the above-mentioned types, and the absolute value of the deviation between the measurement signal 3 measured by the first measuring device 1 and the measurement signal 4 measured by the second measuring device 2 When the value exceeds the set value, that is, when | Y1−Y2 |> α, the signal 5 of “1” is output from the deviation monitor switch 6 to the alarm device 7, and the alarm device 7 issues an alarm. Here, when the abnormality of the first measuring device 1 is confirmed, the switching device 9 is manually switched to the a side by the operator, and the measurement signal 4 measured by the second measuring device 2 is output signal 8
Is output to the control circuit, and thereafter, the repair of the first measuring instrument 1 is performed, and when the abnormality of the second measuring instrument 2 is confirmed, the switch 9 is set to b as in the normal case. The measurement signal 3 measured by the first measuring instrument 1 is output to the control circuit as an output signal 8, and then the second measuring instrument 2 is repaired.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、図3に
示される如き従来の二重化計装の場合、警報装置7から
警報が発せられたとしても、それだけでは第一計測器1
と第二計測器2のうちのどちらの計測器に異常が発生し
ているのかは判断することができないため、運転員が現
場に行って第一計測器1と第二計測器2の状況を実際に
調べる必要があり、手間と時間がかかる一方、第一計測
器1と第二計測器2のうちのどちらの計測器に異常が発
生しているかが判明するまでの間は、計測信号3と計測
信号4のいずれも使用することができず、制御を中断せ
ざるを得ないという不具合を有していた。However, in the case of the conventional dual instrumentation as shown in FIG. 3, even if an alarm is issued from the alarm device 7, the first measuring device 1 is not used.
Since it is impossible to determine which of the two measuring instruments 2 and 3 is abnormal, the operator goes to the site and checks the status of the first measuring instrument 1 and the second measuring instrument 2. While it is necessary to actually check it and it takes time and effort, the measurement signal 3 is kept until which one of the first measuring device 1 and the second measuring device 2 has an abnormality is determined. And the measurement signal 4 cannot be used, and the control must be interrupted.
【0007】本発明は、斯かる実情に鑑み、二つの計測
器のうちのどちらに異常が発生しているかを確実に判断
することができ、異常が発生していない正常な方の計測
器の計測信号を採用し得、制御を中断させることなく円
滑に継続させ得る二重化計装における異常検出方法及び
装置を提供しようとするものである。In view of the above circumstances, the present invention can reliably determine which of the two measuring devices has an abnormality, and can determine which of the two normal measuring devices has no abnormality. An object of the present invention is to provide a method and apparatus for detecting an abnormality in dual instrumentation that can employ a measurement signal and can smoothly continue control without interruption.
【0008】[0008]
【課題を解決するための手段】本発明は、二つの計測器
により同一の物理量を計測し、一方の計測器で計測され
た計測信号を採用するようにした二重化計装における異
常検出方法であって、二つの計測器で計測された計測信
号の偏差の絶対値が設定値を越えると共に、一方の計測
器で計測された計測信号が、基本指令に基づいて求めら
れる計測信号の正常とみなされる上下限値の範囲を逸脱
した場合に、前記一方の計測器で計測された計測信号が
異常であると判断し、他方の計測器で計測された計測信
号を採用することを特徴とする二重化計装における異常
検出方法にかかるものである。SUMMARY OF THE INVENTION The present invention relates to a method for detecting an abnormality in a dual instrumentation in which the same physical quantity is measured by two measuring instruments and a measurement signal measured by one measuring instrument is employed. Thus, the absolute value of the deviation of the measurement signals measured by the two measuring instruments exceeds the set value, and the measurement signal measured by one of the measuring instruments is regarded as normal of the measurement signal obtained based on the basic command. When the value deviates from the range of the upper and lower limit values, the measurement signal measured by the one measurement device is determined to be abnormal, and the measurement signal measured by the other measurement device is adopted, and the dual measurement device is characterized by using the measurement signal measured by the other measurement device. This relates to a method for detecting an abnormality in the device.
【0009】又、本発明は、同一の物理量を計測する二
つの計測器と、該二つの計測器で計測された計測信号の
偏差の絶対値が設定値を越えた場合に、「1」の信号を
出力する偏差モニタスイッチと、基本指令に基づき計測
信号の正常とみなされる上限値を求めて出力する第一関
数発生器と、基本指令に基づき計測信号の正常とみなさ
れる下限値を求めて出力する第二関数発生器と、一方の
計測器で計測された計測信号が、前記第一関数発生器か
ら出力される上限値と前記第二関数発生器から出力され
る下限値との範囲を逸脱した場合に、「1」の信号を出
力するシグナルモニタスイッチと、前記偏差モニタスイ
ッチから出力される信号と前記シグナルモニタスイッチ
から出力される信号とが入力され、両信号の論理積信号
を出力するAND回路と、該AND回路から出力される
論理積信号が「0」の場合には一方の計測器で計測され
た計測信号を出力信号として出力する一方、前記AND
回路から出力される論理積信号が「1」の場合には他方
の計測器で計測された計測信号を出力信号として出力す
る切換器とを備えたことを特徴とする二重化計装におけ
る異常検出装置にかかるものである。Further, the present invention provides two measuring instruments for measuring the same physical quantity, and when the absolute value of the deviation of the measurement signal measured by the two measuring instruments exceeds a set value, "1" is set. A deviation monitor switch that outputs a signal, a first function generator that determines and outputs an upper limit value that is considered normal for the measurement signal based on the basic command, and determines a lower limit value that is considered normal for the measurement signal based on the basic command. The second function generator to output, the measurement signal measured by one of the measuring instruments, the range between the upper limit value output from the first function generator and the lower limit value output from the second function generator. When the signal deviates, a signal monitor switch that outputs a signal of “1”, a signal output from the deviation monitor switch, and a signal output from the signal monitor switch are input, and an AND signal of both signals is output. AND Road and, while logical product signal output from the AND circuit is output as an output signal a measurement signal measured at one meter in the case of "0", the AND
A switching device for outputting, as an output signal, a measurement signal measured by the other measuring device when the logical product signal output from the circuit is "1"; It depends on.
【0010】上記手段によれば、以下のような作用が得
られる。According to the above means, the following effects can be obtained.
【0011】本発明の二重化計装における異常検出方法
では、二つの計測器により同一の物理量が計測され、一
方の計測器で計測された計測信号が採用されている状態
において、二つの計測器で計測された計測信号の偏差の
絶対値が設定値を越えると共に、一方の計測器で計測さ
れた計測信号が、基本指令に基づいて求められる計測信
号の正常とみなされる上下限値の範囲を逸脱した場合に
は、前記一方の計測器で計測された計測信号が異常であ
ると判断され、他方の計測器で計測された計測信号が採
用される。According to the abnormality detection method in the dual instrumentation of the present invention, when the same physical quantity is measured by two measuring instruments, and the measurement signal measured by one of the measuring instruments is used, the two measuring instruments are used. The absolute value of the deviation of the measured measurement signal exceeds the set value, and the measurement signal measured by one of the measuring instruments deviates from the range of the upper and lower limits that are considered to be normal for the measurement signal obtained based on the basic command. In this case, the measurement signal measured by the one measuring instrument is determined to be abnormal, and the measurement signal measured by the other measuring instrument is adopted.
【0012】又、本発明の二重化計装における異常検出
装置では、同一の物理量が二つの計測器とによって計測
され、一方の計測器で計測された計測信号と他方の計測
器で計測された計測信号の偏差の絶対値が偏差モニタス
イッチにおいて設定値と比較され、二つの計測信号が極
端に異なる値となっていない場合には、偏差モニタスイ
ッチから出力される信号は「0」のままであって、AN
D回路から切換器へ出力される論理積信号も「0」であ
り、一方の計測器で計測された計測信号が切換器から出
力信号として出力される。Further, in the abnormality detecting apparatus in the dual instrumentation of the present invention, the same physical quantity is measured by two measuring instruments, and a measurement signal measured by one measuring instrument and a measurement signal measured by the other measuring instrument are used. The absolute value of the deviation of the signal is compared with the set value in the deviation monitor switch, and if the two measurement signals do not have extremely different values, the signal output from the deviation monitor switch remains “0”. And AN
The logical product signal output from the D circuit to the switching device is also “0”, and the measurement signal measured by one measuring device is output from the switching device as an output signal.
【0013】これに対し、一方の計測器が何らかの原因
で故障する等して異常が発生し、二つの計測器で計測さ
れた計測信号の偏差の絶対値が設定値を越えた場合に
は、偏差モニタスイッチから「1」の信号がAND回路
へ出力されると同時に、この時点での基本指令に基づき
計測信号の正常とみなされる上限値が第一関数発生器に
おいて求められてシグナルモニタスイッチへ出力される
と共に、前記基本指令に基づき計測信号の正常とみなさ
れる下限値が第二関数発生器において求められてシグナ
ルモニタスイッチへ出力されており、一方の計測器で計
測された計測信号が、前記第一関数発生器から出力され
る上限値と前記第二関数発生器から出力される下限値と
の範囲を逸脱した場合には、「1」の信号がシグナルモ
ニタスイッチから前記AND回路へ出力されるため、該
AND回路から切換器へ出力される論理積信号は「1」
となり、切換器が切り換えられ、他方の計測器で計測さ
れた計測信号が切換器から出力信号として出力される。On the other hand, when an abnormality occurs due to one of the measuring instruments failing for some reason or the like, and the absolute value of the deviation of the measurement signals measured by the two measuring instruments exceeds the set value, The signal of "1" is output from the deviation monitor switch to the AND circuit, and at the same time, the upper limit value at which the measurement signal is considered to be normal is determined by the first function generator based on the basic command at this time, and is sent to the signal monitor switch While being output, the lower limit value considered as normal of the measurement signal based on the basic command is obtained in the second function generator and output to the signal monitor switch, and the measurement signal measured by one of the measurement devices is If the upper limit value output from the first function generator and the lower limit value output from the second function generator are out of the range, the signal of “1” is output from the signal monitor switch in advance. To be outputted to the AND circuit, the logical product signal output from the AND circuit to the switching device is "1"
Then, the switching device is switched, and the measurement signal measured by the other measuring device is output from the switching device as an output signal.
【0014】一方、逆に、一方の計測器は正常であっ
て、他方の計測器が何らかの原因で故障する等して異常
が発生した場合には、前述と同様に、偏差モニタスイッ
チから「1」の信号がAND回路へ出力されるが、一方
の計測器で計測された計測信号は、前記第一関数発生器
から出力される上限値と前記第二関数発生器から出力さ
れる下限値との範囲内に収まっているため、シグナルモ
ニタスイッチからAND回路へは「0」の信号が出力さ
れ、このため、該AND回路から切換器へ出力される論
理積信号は「0」となり、一方の計測器で計測された計
測信号が切換器から出力信号として出力される。On the other hand, if one of the measuring instruments is normal and the other measuring instrument becomes abnormal due to a failure or the like for some reason, the deviation monitor switch outputs "1" as described above. Is output to the AND circuit, the measurement signal measured by one of the measuring instruments, the upper limit value output from the first function generator and the lower limit value output from the second function generator , A signal of “0” is output from the signal monitor switch to the AND circuit, and the AND signal output from the AND circuit to the switch becomes “0”. The measurement signal measured by the measuring instrument is output from the switch as an output signal.
【0015】この結果、一方の計測器に異常が発生した
ことは、切換器が切り換わったことによって確認できる
ため、この間に、一方の計測器の修理等を行うことが可
能となる一方、他方の計測器に異常が発生したことは、
偏差モニタスイッチの信号が「1」で且つシグナルモニ
タスイッチの信号が「0」になったことによって確認で
きるため、この間に、他方の計測器の修理等を行うこと
が可能となり、一方の計測器と他方の計測器のどちらに
異常が発生したかを確認するために運転員が現場に行く
必要はなくなると共に、異常が発生していない正常な方
の計測器の計測信号が常に採用される形となり、二つの
計測信号がいずれも使用できなくなるようなことはほと
んどなく、制御を中断しなくて済むこととなる。As a result, the occurrence of an abnormality in one of the measuring instruments can be confirmed by the switching of the switching device. An abnormality occurred in any of the measuring instruments
Since it can be confirmed that the signal of the deviation monitor switch is "1" and the signal of the signal monitor switch is "0", it is possible to repair the other measuring instrument during this time, and to perform the repair of the other measuring instrument. The operator does not need to go to the site to check which of the two instruments has failed, and the measurement signal of the normal measuring instrument that has no fault is always adopted. Thus, there is almost no case where neither of the two measurement signals can be used, and the control does not need to be interrupted.
【0016】[0016]
【発明の実施の形態】以下、本発明の実施の形態を図示
例と共に説明する。Embodiments of the present invention will be described below with reference to the drawings.
【0017】図1は本発明を実施する形態の一例であっ
て、図中、図3と同一の符号を付した部分は同一物を表
わしており、基本的な構成は図3に示す従来のものと同
様であるが、本図示例の特徴とするところは、図1に示
す如く、プラント負荷等の基本指令10に基づき計測信
号3の正常とみなされる上限値11を求めて出力する第
一関数発生器12と、前記基本指令10に基づき計測信
号3の正常とみなされる下限値13を求めて出力する第
二関数発生器14と、第一計測器1で計測された計測信
号3が、前記第一関数発生器12から出力される上限値
11と前記第二関数発生器14から出力される下限値1
3との範囲を逸脱した場合に、「1」の信号15を出力
するシグナルモニタスイッチ16と、偏差モニタスイッ
チ6から出力される信号5と前記シグナルモニタスイッ
チ16から出力される信号15とが入力され、両信号
5,15の論理積信号17を出力するAND回路18と
を追加装備し、前記AND回路18から出力される論理
積信号17が「0」の場合には、切換器9をb側に切り
換え、第一計測器1で計測された計測信号3を切換器9
から出力信号8として制御回路へ出力する一方、前記A
ND回路18から出力される論理積信号17が「1」の
場合には、切換器9をa側に切り換え、第二計測器2で
計測された計測信号4を切換器9から出力信号8として
制御回路へ出力するよう構成した点にある。FIG. 1 shows an example of an embodiment of the present invention. In the figure, portions denoted by the same reference numerals as those in FIG. 3 represent the same components. Although the present embodiment is similar to the first embodiment, the feature of the illustrated example is that, as shown in FIG. 1, an upper limit value 11 that is regarded as normal of the measurement signal 3 based on a basic command 10 such as a plant load is output. A function generator 12, a second function generator 14 that calculates and outputs a lower limit 13 that is considered to be normal of the measurement signal 3 based on the basic command 10, and a measurement signal 3 measured by the first measurement device 1. Upper limit value 11 output from the first function generator 12 and lower limit value 1 output from the second function generator 14
3, the signal monitor switch 16 for outputting the signal 15 of "1", the signal 5 output from the deviation monitor switch 6, and the signal 15 output from the signal monitor switch 16 are input. And an AND circuit 18 for outputting a logical product signal 17 of the two signals 5 and 15 is additionally provided. When the logical product signal 17 output from the AND circuit 18 is "0", the switch 9 is set to b. Side and switches the measurement signal 3 measured by the first measuring device 1 to the switching device 9.
From the A to the control circuit.
When the logical product signal 17 output from the ND circuit 18 is “1”, the switch 9 is switched to the “a” side, and the measurement signal 4 measured by the second measuring device 2 is output from the switch 9 as the output signal 8. The point is that it is configured to output to the control circuit.
【0018】前記基本指令10がプラント負荷等であっ
て、第一計測器1並びに第二計測器2で計測される物理
量が温度、圧力、流量等である場合、基本指令10が増
加すれば、通常、計測信号3並びに計測信号4も増加傾
向となるため、前記第一関数発生器12と第二関数発生
器14にはそれぞれ、図2に示す如く、基本指令10の
増加に伴って上限値11と下限値13がそれぞれ増加し
て行くような関数が入力されている。When the basic command 10 is a plant load or the like and the physical quantities measured by the first measuring device 1 and the second measuring device 2 are temperature, pressure, flow rate, etc., if the basic command 10 increases, Normally, the measurement signal 3 and the measurement signal 4 also tend to increase, so that the first function generator 12 and the second function generator 14 each have an upper limit value as the basic command 10 increases, as shown in FIG. A function is input such that 11 and the lower limit 13 increase.
【0019】次に、上記図示例の作動を説明する。Next, the operation of the illustrated example will be described.
【0020】ボイラプラント等における温度、圧力、流
量等の物理量が第一計測器1と第二計測器2とによって
同時に計測され、前記第一計測器1で計測された計測信
号3(Y1)と前記第二計測器2で計測された計測信号
4(Y2)の偏差の絶対値(|Y1−Y2|)が偏差モ
ニタスイッチ6において設定値(α)と比較され、計測
信号3と計測信号4とが極端に異なる値となっていない
場合、即ち|Y1−Y2|≦αとなっている場合には、
偏差モニタスイッチ6から出力される信号5は「0」の
ままであって、AND回路18から切換器9へ出力され
る論理積信号17も「0」であり、切換器9はb側に切
り換えられたまま保持され、第一計測器1で計測された
計測信号3が切換器9から出力信号8として制御回路へ
出力される。Physical quantities such as temperature, pressure and flow rate in a boiler plant and the like are simultaneously measured by a first measuring instrument 1 and a second measuring instrument 2, and a measurement signal 3 (Y1) measured by the first measuring instrument 1 is used. The absolute value (| Y1-Y2 |) of the deviation of the measurement signal 4 (Y2) measured by the second measuring device 2 is compared with a set value (α) by the deviation monitor switch 6, and the measurement signal 3 and the measurement signal 4 Are not extremely different from each other, that is, when | Y1−Y2 | ≦ α,
The signal 5 output from the deviation monitor switch 6 remains "0", the AND signal 17 output from the AND circuit 18 to the switch 9 is also "0", and the switch 9 switches to the b side. The measurement signal 3 measured by the first measuring device 1 is held as it is and output from the switching device 9 as an output signal 8 to the control circuit.
【0021】これに対し、例えば、第一計測器1が何ら
かの原因で故障する等して異常が発生し、前記第一計測
器1で計測された計測信号3と前記第二計測器2で計測
された計測信号4の偏差の絶対値が設定値を越えた場
合、即ち|Y1−Y2|>αとなった場合には、偏差モ
ニタスイッチ6から「1」の信号5がAND回路18へ
出力される。同時に、この時点でのプラント負荷等の基
本指令10に基づき計測信号3の正常とみなされる上限
値11が第一関数発生器12において求められてシグナ
ルモニタスイッチ16へ出力されると共に、前記基本指
令10に基づき計測信号3の正常とみなされる下限値1
3が第二関数発生器14において求められてシグナルモ
ニタスイッチ16へ出力されており、前記第一計測器1
で計測された計測信号3が、前記第一関数発生器12か
ら出力される上限値11と前記第二関数発生器14から
出力される下限値13との範囲を逸脱した場合には、
「1」の信号15がシグナルモニタスイッチ16から前
記AND回路18へ出力される。このため、該AND回
路18から切換器9へ出力される論理積信号17は
「1」となり、切換器9がa側に切り換えられ、第二計
測器2で計測された計測信号4が切換器9から出力信号
8として制御回路へ出力される。On the other hand, for example, when the first measuring device 1 fails for some reason or the like, an abnormality occurs, and the measurement signal 3 measured by the first measuring device 1 and the measurement signal 3 measured by the second measuring device 2 are used. When the absolute value of the deviation of the measured signal 4 exceeds the set value, that is, when | Y1−Y2 |> α, the signal 5 of “1” is output from the deviation monitor switch 6 to the AND circuit 18. Is done. At the same time, an upper limit value 11 at which the measurement signal 3 is considered to be normal based on the basic command 10 such as the plant load at this time is obtained by the first function generator 12 and output to the signal monitor switch 16 and the basic command Lower limit value 1 at which measurement signal 3 is considered normal based on 10
3 is obtained by the second function generator 14 and output to the signal monitor switch 16, and the first measuring device 1
If the measurement signal 3 measured at the time deviates from the range of the upper limit value 11 output from the first function generator 12 and the lower limit value 13 output from the second function generator 14,
A signal 15 of “1” is output from the signal monitor switch 16 to the AND circuit 18. Therefore, the AND signal 17 output from the AND circuit 18 to the switch 9 becomes “1”, the switch 9 is switched to the “a” side, and the measurement signal 4 measured by the second measuring device 2 is switched to the switch 9 to the control circuit as an output signal 8.
【0022】一方、逆に、第一計測器1は正常であっ
て、第二計測器2が何らかの原因で故障する等して異常
が発生した場合には、前述と同様に、偏差モニタスイッ
チ6から「1」の信号5がAND回路18へ出力される
が、第一計測器1で計測された計測信号3は、前記第一
関数発生器12から出力される上限値11と前記第二関
数発生器14から出力される下限値13との範囲内に収
まっているため、シグナルモニタスイッチ16からAN
D回路18へは「0」の信号15が出力され、このた
め、該AND回路18から切換器9へ出力される論理積
信号17は「0」となり、切換器9はb側に切り換えら
れたまま保持され、第一計測器1で計測された計測信号
3が切換器9から出力信号8として制御回路へ出力され
る。On the other hand, if the first measuring device 1 is normal and the second measuring device 2 becomes abnormal due to a failure or the like for some reason, the deviation monitor switch 6 is operated in the same manner as described above. Is output to the AND circuit 18, and the measurement signal 3 measured by the first measuring device 1 is equal to the upper limit value 11 output from the first function generator 12 and the second function Since it is within the range of the lower limit value 13 output from the generator 14, the signal monitor switch 16
The signal 15 of "0" is output to the D circuit 18, and the AND signal 17 output from the AND circuit 18 to the switch 9 becomes "0", and the switch 9 is switched to the b side. The measurement signal 3 measured by the first measuring device 1 is held as it is, and is output from the switching device 9 as an output signal 8 to the control circuit.
【0023】この結果、第一計測器1に異常が発生した
ことは、切換器9がb側からa側に切り換わったことに
よって確認できるため、この間に、第一計測器1の修理
等を行うことが可能となる一方、第二計測器2に異常が
発生したことは、偏差モニタスイッチ6の信号5が
「1」で且つシグナルモニタスイッチ16の信号15が
「0」になったことによって確認できるため、この間
に、第二計測器2の修理等を行うことが可能となり、第
一計測器1と第二計測器2のどちらに異常が発生したか
を確認するために運転員が現場に行く必要はなくなると
共に、異常が発生していない正常な方の第一計測器1或
いは第二計測器2の計測信号3或いは計測信号4が常に
採用される形となり、計測信号3と計測信号4がいずれ
も使用できなくなるようなことはほとんどなく、制御を
中断しなくて済むこととなる。As a result, the occurrence of an abnormality in the first measuring instrument 1 can be confirmed by the switching of the switch 9 from the b side to the a side. On the other hand, the occurrence of an abnormality in the second measuring device 2 is caused by the fact that the signal 5 of the deviation monitor switch 6 is “1” and the signal 15 of the signal monitor switch 16 is “0”. During this time, the second measuring device 2 can be repaired, and the operator can check whether the first measuring device 1 or the second measuring device 2 has failed. And the measurement signal 3 or the measurement signal 4 of the normal first measurement device 1 or the second measurement device 2 in which no abnormality has occurred is always adopted, and the measurement signal 3 and the measurement signal 4 can no longer be used Seldom, so that the need not to interrupt the control.
【0024】こうして、第一計測器1と第二計測器2の
うちのどちらに異常が発生しているかを確実に判断する
ことができ、異常が発生していない正常な方の計測器の
計測信号を採用し得、制御を中断させることなく円滑に
継続させ得る。In this way, it is possible to reliably determine which of the first measuring instrument 1 and the second measuring instrument 2 has an abnormality, and to measure the normal measuring instrument having no abnormality. Signals may be employed and control may continue smoothly without interruption.
【0025】尚、本発明の二重化計装における異常検出
方法及び装置は、上述の図示例にのみ限定されるもので
はなく、本発明の要旨を逸脱しない範囲内において種々
変更を加え得ることは勿論である。It should be noted that the abnormality detecting method and apparatus in the dual instrumentation of the present invention are not limited to the above-described illustrated examples, and various changes can be made without departing from the scope of the present invention. It is.
【0026】[0026]
【発明の効果】以上、説明したように本発明の二重化計
装における異常検出方法及び装置によれば、二つの計測
器のうちのどちらに異常が発生しているかを確実に判断
することができ、異常が発生していない正常な方の計測
器の計測信号を採用し得、制御を中断させることなく円
滑に継続させ得るという優れた効果を奏し得る。As described above, according to the abnormality detecting method and apparatus in the dual instrumentation of the present invention, it is possible to reliably determine which of the two measuring instruments has an abnormality. In this case, it is possible to use the measurement signal of the normal measuring instrument in which no abnormality has occurred, and to achieve an excellent effect that the control can be smoothly continued without interruption.
【図1】本発明を実施する形態の一例の制御ブロック図
である。FIG. 1 is a control block diagram illustrating an example of an embodiment of the present invention.
【図2】図1に示す関数発生器に入力されている関数を
表わす線図である。FIG. 2 is a diagram showing a function input to a function generator shown in FIG. 1;
【図3】従来例の制御ブロック図である。FIG. 3 is a control block diagram of a conventional example.
1 第一計測器(計測器) 2 第二計測器(計測器) 3 計測信号 4 計測信号 5 信号 6 偏差モニタスイッチ 7 警報装置 8 出力信号 9 切換器 10 基本指令 11 上限値 12 第一関数発生器 13 下限値 14 第二関数発生器 15 信号 16 シグナルモニタスイッチ 17 論理積信号 18 AND回路 DESCRIPTION OF SYMBOLS 1 First measuring instrument (measuring instrument) 2 Second measuring instrument (measuring instrument) 3 Measurement signal 4 Measurement signal 5 Signal 6 Deviation monitor switch 7 Alarm device 8 Output signal 9 Switching device 10 Basic command 11 Upper limit value 12 First function generation 13 Lower limit value 14 Second function generator 15 Signal 16 Signal monitor switch 17 Logical product signal 18 AND circuit
Claims (2)
し、一方の計測器で計測された計測信号を採用するよう
にした二重化計装における異常検出方法であって、 二つの計測器で計測された計測信号の偏差の絶対値が設
定値を越えると共に、一方の計測器で計測された計測信
号が、基本指令に基づいて求められる計測信号の正常と
みなされる上下限値の範囲を逸脱した場合に、前記一方
の計測器で計測された計測信号が異常であると判断し、
他方の計測器で計測された計測信号を採用することを特
徴とする二重化計装における異常検出方法。An abnormality detection method in dual instrumentation wherein two physical measuring devices measure the same physical quantity and employ a measurement signal measured by one of the physical measuring devices. The absolute value of the deviation of the measured signal exceeds the set value, and the measured signal measured by one of the measuring instruments has deviated from the range of the upper and lower limits that are considered to be normal of the measured signal obtained based on the basic command. In the case, it is determined that the measurement signal measured by the one measuring device is abnormal,
An abnormality detection method in dual instrumentation, which employs a measurement signal measured by the other measuring instrument.
と、 該二つの計測器で計測された計測信号の偏差の絶対値が
設定値を越えた場合に、「1」の信号を出力する偏差モ
ニタスイッチと、 基本指令に基づき計測信号の正常とみなされる上限値を
求めて出力する第一関数発生器と、 基本指令に基づき計測信号の正常とみなされる下限値を
求めて出力する第二関数発生器と、 一方の計測器で計測された計測信号が、前記第一関数発
生器から出力される上限値と前記第二関数発生器から出
力される下限値との範囲を逸脱した場合に、「1」の信
号を出力するシグナルモニタスイッチと、 前記偏差モニタスイッチから出力される信号と前記シグ
ナルモニタスイッチから出力される信号とが入力され、
両信号の論理積信号を出力するAND回路と、 該AND回路から出力される論理積信号が「0」の場合
には一方の計測器で計測された計測信号を出力信号とし
て出力する一方、前記AND回路から出力される論理積
信号が「1」の場合には他方の計測器で計測された計測
信号を出力信号として出力する切換器とを備えたことを
特徴とする二重化計装における異常検出装置。2. Two measuring instruments for measuring the same physical quantity, and a signal of “1” is output when the absolute value of the deviation of the measurement signal measured by the two measuring instruments exceeds a set value. A deviation monitor switch, a first function generator for obtaining and outputting an upper limit value that is considered normal for the measurement signal based on the basic command, and a second function for obtaining and outputting a lower limit value that is considered normal for the measurement signal based on the basic command. A function generator, when the measurement signal measured by one of the measuring instruments deviates from a range between an upper limit value output from the first function generator and a lower limit value output from the second function generator. , A signal monitor switch that outputs a signal of “1,” a signal output from the deviation monitor switch, and a signal output from the signal monitor switch are input,
An AND circuit that outputs a logical product signal of both signals; and, when the logical product signal output from the AND circuit is “0”, outputs a measurement signal measured by one measuring device as an output signal. A switch for outputting, as an output signal, a measurement signal measured by the other measuring instrument when the AND signal outputted from the AND circuit is "1"; apparatus.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10243292A JP2000076578A (en) | 1998-08-28 | 1998-08-28 | Abnormality detection method and device in dual instrumentation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10243292A JP2000076578A (en) | 1998-08-28 | 1998-08-28 | Abnormality detection method and device in dual instrumentation |
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Publication Number | Publication Date |
---|---|
JP2000076578A true JP2000076578A (en) | 2000-03-14 |
Family
ID=17101681
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007079683A (en) * | 2005-09-12 | 2007-03-29 | Chugoku Electric Power Co Inc:The | Input signal decision support system |
JP2019075025A (en) * | 2017-10-19 | 2019-05-16 | 中国電力株式会社 | Dual instrumentation system |
-
1998
- 1998-08-28 JP JP10243292A patent/JP2000076578A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007079683A (en) * | 2005-09-12 | 2007-03-29 | Chugoku Electric Power Co Inc:The | Input signal decision support system |
JP2019075025A (en) * | 2017-10-19 | 2019-05-16 | 中国電力株式会社 | Dual instrumentation system |
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