JPH07244793A - Correcting method for sensor signal - Google Patents

Correcting method for sensor signal

Info

Publication number
JPH07244793A
JPH07244793A JP6032783A JP3278394A JPH07244793A JP H07244793 A JPH07244793 A JP H07244793A JP 6032783 A JP6032783 A JP 6032783A JP 3278394 A JP3278394 A JP 3278394A JP H07244793 A JPH07244793 A JP H07244793A
Authority
JP
Japan
Prior art keywords
disconnection detection
sensor
current
difference
detection 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
Application number
JP6032783A
Other languages
Japanese (ja)
Inventor
Ryoichi Hiraga
良一 平賀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Facom Corp
Original Assignee
Fuji Facom Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Facom Corp filed Critical Fuji Facom Corp
Priority to JP6032783A priority Critical patent/JPH07244793A/en
Publication of JPH07244793A publication Critical patent/JPH07244793A/en
Pending legal-status Critical Current

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  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

PURPOSE:To exactly grasp only the signal generated by a sensor electro-motive force when letting a detecting current flow to a sensor and extracting its output. CONSTITUTION:A switch SW is provided at a disconnection detecting circuit 1 for letting a disconnection detecting current I flow and while paying attention upon the fact that the drop error component of a wiring resistor R caused by the disconnection detecting current I can be recognized by calculating the difference of respective output values from an A/D converter Q when turning on and off this switch SW, this error component is detected before the operation start of the sensor. Then, a CPU 2 subtracts the error component from the A/D converter output value at the time of operating so that the exact value can be provided.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、熱電対,測温抵抗
体,ポテンショメータ等の各種センサ信号を取り込むに
当たり、電流を流して断線の検出を行なう機能(バーン
アウト機能と呼ばれる)を持ったセンサ信号の補正方法
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor having a function (called a burnout function) for detecting a disconnection by passing an electric current when capturing various sensor signals of a thermocouple, a resistance temperature detector, a potentiometer and the like. The present invention relates to a signal correction method.

【0002】[0002]

【従来の技術】一般に、センサ信号を扱うセンサ信号変
換モジュールでは、断線を検出する機能を持つことが必
要である。従来、シングルで構成されたセンサ信号変換
モジュールの断線検出方法は、信号源インピーダンスは
極めて小さいものとして、センサ信号変換モジュールか
ら信号源へ微小電流を流し、信号源が断線していれば電
流が流れないことを検出して、断線と判定するようにし
ている。
2. Description of the Related Art Generally, a sensor signal conversion module that handles a sensor signal needs to have a function of detecting disconnection. Conventionally, the disconnection detection method of a sensor signal conversion module composed of a single, assuming that the signal source impedance is extremely small, sends a small current from the sensor signal conversion module to the signal source, and if the signal source is disconnected, the current flows. When it is not present, it is judged as a disconnection.

【0003】図5は従来例を示す構成図で、1は断線検
出回路、2は処理装置(CPU)、Qはアナログ/ディ
ジタル(A/D)変換器である。このような構成におい
て、断線検出電流をI、配線抵抗をR(片道)、センサ
信号の起電力をVsとすると、A/D変換器Qに入力さ
れる電圧Vは、 V=Vs+2RI …(1) と表わされる。つまり、センサに流す断線検出電流Iの
配線抵抗Rによるドロップ分(2RI)が誤差としてセ
ンサ信号の起電力Vsに加算され、センサ信号変換モジ
ュールAに入力される。
FIG. 5 is a block diagram showing a conventional example. 1 is a disconnection detection circuit, 2 is a processing unit (CPU), and Q is an analog / digital (A / D) converter. In such a configuration, assuming that the disconnection detection current is I, the wiring resistance is R (one way), and the electromotive force of the sensor signal is Vs, the voltage V input to the A / D converter Q is V = Vs + 2RI (1 ). That is, the drop amount (2RI) of the wire breakage detection current I flowing through the sensor due to the wiring resistance R is added as an error to the electromotive force Vs of the sensor signal and input to the sensor signal conversion module A.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、上記の
ような方式では、以下のような問題がある。 (a)単一(シングル)構成の場合 断線検出電流をIとしてセンサ信号だけを読み取ろうと
しても、センサ信号の起電力Vsに断線検出電流と配線
抵抗によるドロップ電圧(2RI)が誤差として加わっ
てセンサ信号変換モジュールAに入力されるため、セン
サ信号だけの起電力を正確に読み取ることが難しい。
However, the above method has the following problems. (A) Single (single) configuration Even if an attempt is made to read only the sensor signal with the disconnection detection current as I, the disconnection detection current and the drop voltage (2RI) due to the wiring resistance are added as an error to the electromotive force Vs of the sensor signal. Since it is input to the sensor signal conversion module A, it is difficult to accurately read the electromotive force of only the sensor signal.

【0005】 (b)2重化(待機冗長:Duplex)構成の場合 稼働側断線検出電流をI1、待機側断線検出電流をI2
としてセンサ信号だけを読み取ろうとしても、稼働側,
待機側ともに動作するときは、センサ信号の起電力Vs
に対し、断線検出電流にもとづく配線抵抗電圧(2RI
1+2RI2)が誤差として加わってセンサ信号変換モ
ジュールAに入力されるため、この場合も同様に、セン
サ信号だけの起電力を正確に読み取ることは困難とな
る。したがって、この発明の課題はセンサ信号だけの起
電力を正確に把握し得るようにすることにある。
(B) In the case of a duplex (standby redundancy: Duplex) configuration, the operating side disconnection detection current is I1, and the standby side disconnection detection current is I2.
Even if you try to read only the sensor signal as
When both standby sides operate, the electromotive force Vs of the sensor signal
In contrast, the wiring resistance voltage (2RI
Since (1 + 2RI2) is added as an error and input to the sensor signal conversion module A, also in this case, similarly, it becomes difficult to accurately read the electromotive force of only the sensor signal. Therefore, an object of the present invention is to accurately grasp the electromotive force of only the sensor signal.

【0006】[0006]

【課題を解決するための手段】このような課題を解決す
るため、第1の発明では、スイッチを有しセンサに対し
電流を通流,遮断して断線の検出を行なう断線検出回路
と、センサ出力信号をアナログ/ディジタル(A/D)
変換するA/D変換器と、変換されたディジタル信号に
もとづき補正を含む所定の演算を行なう処理装置とを備
え、動作開始前に前記センサに断線検出電流を流した場
合と流さない場合のA/D変換値のそれぞれの差を求
め、動作時に前記センサに電流を流して得られるA/D
変換値から前記A/D変換値の差を差し引くことによ
り、断線検出電流による誤差を補正することを特徴とし
ている。
In order to solve such a problem, according to a first aspect of the present invention, a disconnection detection circuit having a switch for detecting and disconnecting a current by allowing or interrupting a current to and from a sensor is provided, and a sensor. Output signal is analog / digital (A / D)
An A / D converter for conversion and a processing device for performing a predetermined calculation including correction based on the converted digital signal are provided, and A for a case where a disconnection detection current is applied to the sensor before operation is started and a case where it is not applied A / D obtained by obtaining the difference between the respective A / D conversion values and applying a current to the sensor during operation
An error due to the disconnection detection current is corrected by subtracting the difference between the A / D converted values from the converted value.

【0007】第2の発明では、スイッチを有しセンサに
対して電流を通流,遮断して断線の検出を行なう断線検
出回路と、センサ出力信号をアナログ/ディジタル(A
/D)変換するA/D変換器と、変換されたディジタル
信号にもとづき補正を含む所定の演算を行なう処理装置
とを各2組設けるとともに、前記処理装置間を通信手段
を介して接続し、一方を稼働側,他方を待機側として運
用するに当たり、稼働側,待機側でともに断線検出を行
なう旨の設定をしたときは、稼働側は待機側が実装され
ているかどうかを前記通信手段を介して確認し、その結
果、待機側が実装されていない場合は、稼働側では動作
開始前に前記センサに断線検出電流を流した場合と流さ
ない場合のA/D変換値のそれぞれの差を求め、動作時
に前記センサに電流を流して得られるA/D変換値から
前記A/D変換値の差を差し引くことにより、断線検出
電流による誤差の補正を行ない、待機側が実装されてい
る場合は、稼働側,待機側のそれぞれで動作開始前に前
記センサに断線検出電流を流した場合と流さない場合の
A/D変換値のそれぞれの差を求めてその結果を相手側
に伝送しておき、これにより動作時における断線検出電
流による誤差を補正することを特徴としている。
According to the second aspect of the invention, a disconnection detection circuit having a switch for detecting and disconnecting a current by allowing or interrupting a current to and from the sensor, and an analog / digital (A) sensor output signal
/ D) A / D converter for conversion and two sets of processing devices each for performing a predetermined calculation based on the converted digital signal are provided, and the processing devices are connected via a communication means. When operating one side as the operating side and the other side as the standby side, if both the operating side and the standby side are set to detect disconnection, the operating side determines whether or not the standby side is installed through the communication means. As a result, if the standby side is not mounted, the operating side obtains the difference between the A / D converted values when the disconnection detection current is applied to the sensor before the operation is started and when it is not applied, and the operation is performed. Sometimes, the difference in the A / D converted value is subtracted from the A / D converted value obtained by passing a current through the sensor to correct the error due to the disconnection detection current. Before starting the operation on each of the standby sides, the difference between the A / D conversion values when the disconnection detection current is applied to the sensor and when it is not applied is calculated, and the result is transmitted to the other side. The feature is that the error due to the disconnection detection current at the time is corrected.

【0008】第2の発明においては、前記稼働側では断
線検出を行ない、待機側では断線検出を行なわないと設
定したときは、稼働側では自側の断線検出電流によるA
/D変換値の差にもとづく誤差の補正を行ない、待機側
では稼働側の断線検出電流によるA/D変換値の差を前
記通信手段を介して知り、これにもとづいて断線検出電
流による誤差の補正を行なうことができる(第3の発
明)。さらに、この第3の発明では、前記稼働側が故障
したときは、その断線検出回路を無効にするとともに待
機側に切り換え、待機側では自側の断線検出電流による
A/D変換値の差にもとづき誤差の補正を行なうことが
できる(第4の発明)。
In the second aspect of the present invention, when it is set that the disconnection detection is performed on the operating side and the disconnection detection is not performed on the standby side, A on the operating side is determined by the disconnection detection current of its own side.
The error based on the difference between the A / D conversion values is corrected, and the standby side knows the difference between the A / D conversion values due to the disconnection detection current on the operating side through the communication means. Correction can be performed (third invention). Further, in the third aspect of the invention, when the operating side fails, the disconnection detection circuit is disabled and switched to the standby side, and the standby side is based on the difference in the A / D conversion value due to the disconnection detection current of the own side. The error can be corrected (the fourth invention).

【0009】[0009]

【作用】熱電対,測温抵抗体,ポテンショメータ等の各
種センサがシングル,2重化構成のいずれでも、センサ
に対し検出電流を通流,遮断させる断線検出回路を設け
て、それぞれの場合のセンサ出力値を検出することで誤
差分、つまり断線検出電流による配線抵抗のドロップ分
を知ることができるようにし、これを利用してセンサ信
号分のみを把握可能とする。特に、2重化構成の場合
は、通信手段を付加して誤差分を相手側に伝送すること
により、稼働側,待機側の一方のみ、または双方で断線
検出を行なう場合にも、対処可能とする。
[Effect] Whether the sensors such as thermocouples, resistance temperature detectors, potentiometers, etc., are of single or double construction, a disconnection detection circuit for passing or interrupting the detection current is provided to the sensors, and the sensor in each case is provided. By detecting the output value, the error amount, that is, the drop amount of the wiring resistance due to the disconnection detection current can be known, and by utilizing this, only the sensor signal component can be grasped. In particular, in the case of the duplex configuration, it is possible to deal with disconnection detection on only one of the operating side and the standby side or both by transmitting the error component to the other side by adding communication means. To do.

【0010】[0010]

【実施例】図1はこの発明の実施例を示す構成図であ
る。この実施例は、同図からも明らかなように、図5に
対しスイッチSWを付加して構成される。そして、この
スイッチSWを動作開始前にオン(断線検出電流Iを通
流する)として、そのときQに入力されディジタル変換
された電圧を、CPU2で認識する。このとき、CPU
2で認識される値は、「センサ信号の起電力+IRドロ
ップ」ということになる。
1 is a block diagram showing an embodiment of the present invention. This embodiment is constructed by adding a switch SW to FIG. 5, as is apparent from the figure. Then, the switch SW is turned on (the disconnection detection current I is allowed to flow) before the operation is started, and the CPU 2 recognizes the voltage input to Q and digitally converted. At this time, the CPU
The value recognized in 2 is “electromotive force of sensor signal + IR drop”.

【0011】次に、同様にスイッチSWをオフとして、
そのときQに入力されディジタル変換される電圧を、C
PU2で認識する。このとき、CPU2で認識される値
は、「センサ信号の起電力」のみとなる。そこで、前者
の値から後者の値を引けば、誤差としての配線抵抗電圧
ドロップ分2RIを得ることができる。なお、こうして
得られた配線抵抗電圧ドロップ分2RIは、通常は図示
されないメモリに格納される。したがって、動作中はQ
より出力される電圧から、先に求めたドロップ分2RI
を差し引くことで、センサ信号の起電力のみの値を得る
ことが可能となる。
Next, similarly, the switch SW is turned off,
At that time, the voltage input to Q and digitally converted is C
It is recognized by PU2. At this time, the value recognized by the CPU 2 is only the "electromotive force of the sensor signal". Therefore, by subtracting the latter value from the former value, the wiring resistance voltage drop 2RI as an error can be obtained. The wiring resistance voltage drop 2RI thus obtained is normally stored in a memory (not shown). Therefore, during operation, Q
From the voltage output from the
By subtracting, it becomes possible to obtain the value of only the electromotive force of the sensor signal.

【0012】数式で説明すると、以下のようになる。断
線検出電流Iの通流(オン)時に、Qに入力される電圧
Vonは、 Von=Vs+2RI …(2) 断線検出電流Iの遮断(オフ)時に、Qに入力される電
圧Voffは、 Voff=Vs …(3) (2)式−(3)式から、断線検出電流にもとづく配線
抵抗ドロップ分は、 Von−Voff=2RI …(4) となる。
Describing by the mathematical formula, it is as follows. When the disconnection detection current I is flowing (ON), the voltage Von input to Q is Von = Vs + 2RI (2) When the disconnection detection current I is cut off (OFF), the voltage Voff input to Q is Voff = Vs (3) From the equation (2)-(3), the wiring resistance drop amount based on the disconnection detection current is Von-Voff = 2RI (4).

【0013】運転中は断線検出回路は有効にされるの
で、(2)式から(4)式の減算を下記の如く実行する
ことにより、 V=Von−2RI =Vs+2RI−2RI =Vs …(5) のように、センサ信号の起電力のみのA/D変換値を得
ることができる。
Since the disconnection detection circuit is enabled during operation, V = Von-2RI = Vs + 2RI-2RI = Vs (5) by executing the subtraction of equation (4) from equation (2) as follows. ), It is possible to obtain the A / D converted value of only the electromotive force of the sensor signal.

【0014】図2は請求項2に対応する構成図で、セン
サ信号変換モジュールをA,Bの2重化構成とし、一方
を稼働側,他方を待機側として冗長待機運転を行なうも
のである。また、センサ信号変換モジュールA,Bには
それぞれ伝送回路3,6および伝送路7等からなる伝送
手段を設け、この伝送手段を介して相互に信号のやりと
りを可能としている。さらに、稼働側,待機側で断線検
出を行なうか否か(有効,無効)は図示されないスイッ
チなどにより、指定できるようになっているものとす
る。ここでは稼働側,待機側とも断線検出を実行するも
の(有効)と設定する。
FIG. 2 is a block diagram corresponding to claim 2, in which the sensor signal conversion module has a dual configuration of A and B, and one side is on the operating side and the other side is on the standby side to perform redundant standby operation. Further, the sensor signal conversion modules A and B are provided with transmission means composed of the transmission circuits 3 and 6 and the transmission path 7, etc., and signals can be mutually exchanged via the transmission means. Further, it is assumed that whether or not disconnection detection is to be performed (active or inactive) on the operating side and the standby side can be designated by a switch or the like not shown. Here, the active side and the standby side are both set to enable disconnection detection (valid).

【0015】このような構成において、まず、稼働側は
待機側が実装されているか否かを伝送回路3,6および
伝送路7などの通信手段によって確認し、待機側が実装
されていない場合は、稼働側はSW1をオン,オフさせ
て得た各A/D変換値の差を所定のメモリに記憶し、こ
の記憶された各A/D変換値の差を用いて実運転時のセ
ンサ出力を補正する。つまり、上記のシングル構成の場
合と全く同様の処理を行なう。
In such a structure, first, the operating side checks whether or not the standby side is mounted by the communication means such as the transmission circuits 3 and 6 and the transmission line 7. If the standby side is not mounted, the operating side operates. On the side, the difference between the A / D converted values obtained by turning on and off SW1 is stored in a predetermined memory, and the sensor output during actual operation is corrected using the stored difference between the A / D converted values. To do. That is, the same processing as in the case of the above single configuration is performed.

【0016】これに対し、待機側が実装されている場合
は、稼働側と待機側でそれぞれSW1,SW2をオン,
オフさせて得た各A/D変換値の差を伝送回路3,6お
よび伝送路7の通信手段を利用して相互に通知する。そ
して、運転時には稼働側,待機側の双方で断線検出を有
効とし、自側で得た各A/D変換値の差の他に通信によ
り得た他側の各A/D変換値の差を加算し、これを実運
転時のセンサ出力から差し引くことにより、補正を行な
う。
On the other hand, when the standby side is mounted, SW1 and SW2 are turned on, respectively on the operating side and the standby side.
The communication means of the transmission circuits 3 and 6 and the transmission path 7 are used to notify each other of the difference between the respective A / D converted values obtained by turning them off. During operation, the disconnection detection is enabled on both the operating side and the standby side, and in addition to the difference between the A / D conversion values obtained on the self side, the difference between the A / D conversion values on the other side obtained through communication is Correction is performed by adding and subtracting this from the sensor output during actual operation.

【0017】以上を数式で説明すると、下記のようにな
る。稼働側の断線検出電流I1のみの通流(オン)時
に、Q1に入力される電圧V1onは、 V1on=Vs+2RI1 …(6) 稼働側の断線検出電流I1のみの遮断(オフ)時に、Q
1に入力される電圧V1offは、 V1off=Vs …(7) (6)式−(7)式から、断線検出電流による配線抵抗
ドロップ誤差は、 V1on−V1off=2RI1 …(8) となる。
The above is described in terms of mathematical expressions as follows. When only the disconnection detection current I1 on the operating side flows (ON), the voltage V1on input to Q1 is: V1on = Vs + 2RI1 (6) When only the disconnection detection current I1 on the operating side is cut off (OFF), Q1
The voltage V1off input to 1 is: V1off = Vs (7) From equation (6)-(7), the wiring resistance drop error due to the disconnection detection current is V1on-V1off = 2RI1 (8).

【0018】一方、待機側の断線検出電流I2のみの通
流(オン)時に、Q2に入力される電圧V2onは、 V2on=Vs+2RI2 …(9) 次に、待機側の断線検出電流I2のみの遮断(オフ)時
に、Q2に入力される電圧V2offは、 V2off=Vs …(10) (9)式−(10)式から、配線抵抗ドロップ誤差は、 V2on−V2off=2RI2 …(11) となる。
On the other hand, when only the disconnection detection current I2 on the standby side flows (ON), the voltage V2on input to Q2 is V2on = Vs + 2RI2 (9) Next, only the disconnection detection current I2 on the standby side is cut off. At the time of (OFF), the voltage V2off input to Q2 is: V2off = Vs (10) From equation (9)-(10), the wiring resistance drop error is V2on-V2off = 2RI2 (11).

【0019】そして、運転時には断線検出電流I1,I
2とも有効とされるので、Q1,Q2に入力される電圧
Vは、 V=Vs+2RI1+2RI2 …(12) となる。したがって、(12)式から(8)式と(1
1)式を減算することにより、次式のように、稼働側,
待機側ともセンサ信号の起電力VsのA/D変換値のみ
を求めることができる。 V12=V−2RI1−2RI2 =Vs+2RI1+2RI2−2RI1−2RI2 =Vs …(13)
During operation, the disconnection detection currents I1, I
Since both 2 are valid, the voltage V input to Q1 and Q2 is V = Vs + 2RI1 + 2RI2 (12) Therefore, equations (12) to (8) and (1
By subtracting formula 1), the working side,
Both the standby side can obtain only the A / D converted value of the electromotive force Vs of the sensor signal. V12 = V-2RI1-2RI2 = Vs + 2RI1 + 2RI2-2RI1-2RI2 = Vs (13)

【0020】図3は請求項3に対応する構成図である。
これは、待機側では断線検出をしない場合(無効)の例
で、稼働側で待機側が実装されているか否かを伝送回路
3,6および伝送路7等の通信手段で確認し、待機側が
実装されていない場合は、稼働側がスイッチSW1をオ
ン・オフさせたときの断線検出電流による各A/D変換
器Q1の差を、所定のメモリに記憶して補正を行なう一
方、待機側が実装されている場合は、稼働側が上記各A
/D変換器Q1の差を上記通信手段を介して待機側に知
らせる。そして、運転時には稼働側のみ断線検出を有効
とするので、稼働側,待機側ともに稼働側で収集した誤
差データを用いて補正を行なう。
FIG. 3 is a block diagram corresponding to claim 3. In FIG.
This is an example of when the disconnection is not detected on the standby side (invalid). Whether the standby side is mounted on the operating side is confirmed by communication means such as the transmission circuits 3 and 6 and the transmission line 7, and the standby side is mounted. If not, the difference between the A / D converters Q1 due to the disconnection detection current when the switch SW1 is turned on / off on the operating side is stored in a predetermined memory for correction, while the standby side is mounted. If there is a
The standby side is notified of the difference in the / D converter Q1 via the communication means. Since disconnection detection is enabled only on the working side during operation, correction is performed using error data collected on the working side for both the working and standby sides.

【0021】数式で説明すると、以下のようになる。稼
働側の断線検出電流I1のみの通流(オン)時に、Q
1,Q2に入力される電圧V1onは、 V1on=Vs+2RI1 …(6) 稼働側の断線検出電流I1のみの遮断(オフ)時に、Q
1,Q2に入力される電圧V1offは、 V1off=Vs …(7) (6)−(7)から、配線抵抗ドロップ誤差は、 V1on−V1off=2RI1 …(8) となる。
This will be described below by using mathematical expressions. When only the disconnection detection current I1 on the operating side is flowing (ON), Q
The voltage V1on input to 1, Q2 is: V1on = Vs + 2RI1 (6) When the disconnection detection current I1 on the operating side is cut off (OFF),
The voltage V1off input to 1 and Q2 is V1off = Vs (7) (6)-(7), and the wiring resistance drop error is V1on-V1off = 2RI1 (8).

【0022】そして、運転時は稼働側の断線検出のみを
有効にするので、Q1,Q2に入力される電圧V12は
(6)式のようになり、この(6)式から(8)式を減
算することにより、次式の如く稼働側,待機側ともセン
サ信号の起電力VsのA/D変換値を求めることができ
る。 V12=V1on−2RI1 =Vs+2RI1−2RI1 =Vs …(14)
Since only the disconnection detection on the operating side is enabled during operation, the voltage V12 input to Q1 and Q2 is as shown in equation (6). From equation (6), equation (8) can be obtained. By subtracting, the A / D conversion value of the electromotive force Vs of the sensor signal can be obtained on both the operating side and the standby side as in the following equation. V12 = V1on-2RI1 = Vs + 2RI1-2RI1 = Vs (14)

【0023】図4は請求項4に対応する構成図である。
これは、図3と同じく待機側では断線検出をしない場合
(無効)の例で、したがって、図3と同様の処理を行な
う。ここで、稼働側が故障した場合、CPU2からER
1信号を出力してスイッチSW1をオフとして自側の断
線検出を無効にするとともに、そのことを伝送回路3,
6および伝送路7からなる伝送手段を介して待機側に知
らせる。
FIG. 4 is a block diagram corresponding to claim 4. In FIG.
This is an example of the case where the disconnection is not detected (invalid) on the standby side as in FIG. 3, and therefore the same processing as in FIG. 3 is performed. Here, if the operating side fails, the CPU2
1 signal is output to turn off the switch SW1 to invalidate the disconnection detection on the local side, and the transmission circuit 3,
The standby side is notified via the transmission means consisting of 6 and the transmission path 7.

【0024】これにより、待機側は自側の断線検出を有
効とし、スイッチSW2をオンとして自側の断線電流に
よるA/D変換値の差にもとづく補正を行なう。なお、
待機側も故障した場合は、CPU5からER2信号を出
力してスイッチSW2をオフとする。この場合の数式は
以下のようになる。稼働側の故障でスイッチSW1がオ
フにされると、Q1,Q2に入力される電圧V1off
は、 V1off=Vs …(7) となる。
As a result, the standby side enables the disconnection detection of its own side, turns on the switch SW2, and performs the correction based on the difference in the A / D conversion value due to the disconnection current of the own side. In addition,
If the standby side also fails, the CPU 5 outputs the ER2 signal to turn off the switch SW2. The formula in this case is as follows. When the switch SW1 is turned off due to a failure on the operating side, the voltage V1off input to Q1 and Q2
Becomes V1off = Vs (7)

【0025】その後、待機側でスイッチSW2をオンと
して自側の断線検出を有効にすると、Q2に入力される
電圧は、 V2on=Vs+2RI2 …(9) となる。そして、(9)式から(11)式を減算するこ
とにより、待機側は次式の如くセンサ信号の起電力Vs
のみのA/D変換値を得ることができる。 V=V2on−2RI2 =Vs+2RI2−2RI2 =Vs …(15)
After that, when the switch SW2 is turned on on the standby side to enable the disconnection detection on the self side, the voltage input to Q2 becomes V2on = Vs + 2RI2 (9). Then, by subtracting the expression (11) from the expression (9), the standby side electromotive force Vs of the sensor signal is expressed by the following expression.
Only A / D converted values can be obtained. V = V2on-2RI2 = Vs + 2RI2-2RI2 = Vs (15)

【0026】[0026]

【発明の効果】この発明によれば、センサ信号変換モジ
ュールがシングル構成,2重化構成のいずれの場合で
も、配線抵抗による配線抵抗ドロップ誤差分を検出し得
るようにしたので、センサ信号のみのA/D変換値を正
確に把握することが可能になる利点がもたらされる。ま
た、2重化構成の場合は、通信手段を付加して上記誤差
分を相手側に伝送することにより、稼働側,待機側の一
方のみ、または双方で断線検出を行なう場合にも、対処
することができる。
According to the present invention, it is possible to detect the wiring resistance drop error due to the wiring resistance regardless of whether the sensor signal conversion module has a single structure or a double structure. There is an advantage that the A / D conversion value can be accurately grasped. Further, in the case of the duplex configuration, it is possible to cope with the case where the disconnection is detected on only one of the operating side and the standby side or both by transmitting the error amount to the other side by adding the communication means. be able to.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の原理を説明するための原理説明図で
ある。
FIG. 1 is a principle explanatory view for explaining the principle of the present invention.

【図2】この発明の実施例を示す構成図である。FIG. 2 is a configuration diagram showing an embodiment of the present invention.

【図3】図2の変形例を説明するための説明図である。FIG. 3 is an explanatory diagram for explaining a modified example of FIG.

【図4】図3の変形例を説明するための説明図である。FIG. 4 is an explanatory diagram for explaining a modified example of FIG.

【図5】従来例を示す構成図である。FIG. 5 is a configuration diagram showing a conventional example.

【符号の説明】[Explanation of symbols]

1,4…断線検出回路、2,5…処理装置(CPU)、
3,6…伝送回路、7…伝送路、SW,SW1,SW2
…スイッチ、Q,Q1,Q2…アナログ/ディジタル
(A/D)変換器、A,B…センサ信号変換モジュー
ル。
1, 4 ... Disconnection detection circuit, 2, 5 ... Processing unit (CPU),
3, 6 ... Transmission circuit, 7 ... Transmission path, SW, SW1, SW2
... switch, Q, Q1, Q2 ... analog / digital (A / D) converter, A, B ... sensor signal conversion module.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 スイッチを有しセンサに対し電流を通
流,遮断して断線の検出を行なう断線検出回路と、セン
サ出力信号をアナログ/ディジタル(A/D)変換する
A/D変換器と、変換されたディジタル信号にもとづき
補正を含む所定の演算を行なう処理装置とを備え、動作
開始前に前記センサに断線検出電流を流した場合と流さ
ない場合のA/D変換値のそれぞれの差を求め、動作時
に前記センサに電流を流して得られるA/D変換値から
前記A/D変換値の差を差し引くことにより、断線検出
電流による誤差を補正することを特徴とするセンサ信号
の補正方法。
1. A disconnection detection circuit having a switch for detecting and disconnecting a current by allowing or interrupting an electric current flowing through the sensor, and an A / D converter for analog / digital (A / D) converting a sensor output signal. A difference between the A / D conversion values when a disconnection detection current is applied to the sensor before the operation is started and when a disconnection detection current is applied to the sensor before the operation is started. And a difference between the A / D converted values is subtracted from an A / D converted value obtained by applying a current to the sensor during operation, thereby correcting an error due to a disconnection detection current. Method.
【請求項2】 スイッチを有しセンサに対して電流を通
流,遮断して断線の検出を行なう断線検出回路と、セン
サ出力信号をアナログ/ディジタル(A/D)変換する
A/D変換器と、変換されたディジタル信号にもとづき
補正を含む所定の演算を行なう処理装置とを各2組設け
るとともに、前記処理装置間を通信手段を介して接続
し、一方を稼働側,他方を待機側として運用するに当た
り、 稼働側,待機側でともに断線検出を行なう旨の設定をし
たときは、稼働側は待機側が実装されているかどうかを
前記通信手段を介して確認し、その結果、 待機側が実装されていない場合は、稼働側では動作開始
前に前記センサに断線検出電流を流した場合と流さない
場合のA/D変換値のそれぞれの差を求め、動作時に前
記センサに電流を流して得られるA/D変換値から前記
A/D変換値の差を差し引くことにより、断線検出電流
による誤差の補正を行ない、 待機側が実装されている場合は、稼働側,待機側のそれ
ぞれで動作開始前に前記センサに断線検出電流を流した
場合と流さない場合のA/D変換値のそれぞれの差を求
めてその結果を相手側に伝送しておき、これにより動作
時における断線検出電流による誤差を補正することを特
徴とするセンサ信号の補正方法。
2. A disconnection detection circuit having a switch for detecting and disconnecting a current by allowing or interrupting a current flow to the sensor, and an A / D converter for analog / digital (A / D) converting the sensor output signal. And two processing devices for performing a predetermined calculation including correction based on the converted digital signal, and the processing devices are connected via a communication means, one of which is an operating side and the other of which is a standby side. In operation, if both the operating side and the standby side are set to detect disconnection, the operating side checks whether the standby side is installed via the communication means, and as a result, the standby side is installed. If not, the operating side obtains the difference between the A / D conversion values when the disconnection detection current is applied to the sensor before the operation is started and when it is not applied, and the current is applied to the sensor during operation. The difference due to the A / D converted value is subtracted from the A / D converted value to correct the error due to the disconnection detection current. In addition, the difference between the A / D converted values when the disconnection detection current is applied to the sensor and when the disconnection detection current is not applied is obtained and the result is transmitted to the other side. A method for correcting a sensor signal, which comprises performing correction.
【請求項3】 前記稼働側では断線検出を行ない、待機
側では断線検出を行なわないと設定したときは、稼働側
では自側の断線検出電流によるA/D変換値の差にもと
づく誤差の補正を行ない、待機側では稼働側の断線検出
電流によるA/D変換値のそれぞれの差を前記通信手段
を介して知り、これにもとづいて断線検出電流による誤
差の補正を行なうことを特徴とする請求項2に記載のセ
ンサ信号の補正方法。
3. When the operating side detects the disconnection and the standby side does not detect the disconnection, the operating side corrects an error based on a difference between A / D conversion values due to the disconnection detection current of the self side. In the standby side, the difference between the A / D converted values due to the disconnection detection current on the operating side is known via the communication means, and the error due to the disconnection detection current is corrected based on this. Item 2. A method for correcting a sensor signal according to Item 2.
【請求項4】 前記稼働側が故障したときは、その断線
検出回路を無効にするとともに待機側に切り換え、待機
側では自側の断線検出電流によるA/D変換値の差にも
とづき誤差の補正を行なうことを特徴とする請求項3に
記載のセンサ信号の補正方法。
4. When the operating side fails, the disconnection detection circuit is disabled and switched to the standby side, and the standby side corrects the error based on the difference in the A / D conversion value due to the disconnection detection current of the own side. The method of correcting a sensor signal according to claim 3, wherein the method is performed.
JP6032783A 1994-03-03 1994-03-03 Correcting method for sensor signal Pending JPH07244793A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6032783A JPH07244793A (en) 1994-03-03 1994-03-03 Correcting method for sensor signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6032783A JPH07244793A (en) 1994-03-03 1994-03-03 Correcting method for sensor signal

Publications (1)

Publication Number Publication Date
JPH07244793A true JPH07244793A (en) 1995-09-19

Family

ID=12368459

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6032783A Pending JPH07244793A (en) 1994-03-03 1994-03-03 Correcting method for sensor signal

Country Status (1)

Country Link
JP (1) JPH07244793A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150276498A1 (en) * 2014-03-27 2015-10-01 Rockwell Automation Technologies, Inc. Thermocouple module with wire resistance compensation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150276498A1 (en) * 2014-03-27 2015-10-01 Rockwell Automation Technologies, Inc. Thermocouple module with wire resistance compensation

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