JPS59116811A - Diagnosing method of input abnormality - Google Patents
Diagnosing method of input abnormalityInfo
- Publication number
- JPS59116811A JPS59116811A JP57225858A JP22585882A JPS59116811A JP S59116811 A JPS59116811 A JP S59116811A JP 57225858 A JP57225858 A JP 57225858A JP 22585882 A JP22585882 A JP 22585882A JP S59116811 A JPS59116811 A JP S59116811A
- Authority
- JP
- Japan
- Prior art keywords
- transmitter
- output signal
- control device
- process variable
- water level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0224—Process history based detection method, e.g. whereby history implies the availability of large amounts of data
- G05B23/0227—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Testing And Monitoring For Control Systems (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明のオリ用分野〕
本発明は、制御装置の入力信号の異常の有無を、入力信
号レベル及び負荷インピーダンスの変化による入力信号
の変化により診断する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Original Field of the Invention] The present invention relates to a method for diagnosing the presence or absence of an abnormality in an input signal of a control device based on changes in the input signal due to changes in the input signal level and load impedance.
第１図の様な、待機系をもつ水位制御を例に、説明する
。タンク水位は、伝送器Ａ１及び伝送器Ｂ２によシ各々
検出する。この水位信号を受けて、制御装置Ａ３、及び
制御装置Ｂ４は、調節弁Ａ５、及び調節弁Ｂ６を各々動
作させ、タンク水位を規定水位に制御する。伝送器Ａ１
のタンク水位の計測範囲と、伝送器Ｂ２のタンク水位の
計測範囲は異なる。又制御装置Ａ３と制御装置Ｂ４の水
位設定値は異なる。すなわち制御装置Ａ３で制御しきれ
ず、水位が上昇した場合、待機制御系である制御装置Ｂ
４が動作を開始し、水位を規定値に制御するものである
。ここで、伝送器Ａ１、及び伝送器Ｂ１が異常をきたす
と、制御装置は誤動作し、水位を規定値に保つことが出
来ない為、伝送器の出力信号が、正常な信号範囲以外、
すなわち上限又は下限となったことを検出し制御装置の
出力をホールドし、水位の変動を抑える方法がある。し
かしこの方法では、伝送器Ａ１については、上限、伝送
器Ｂ２については下限は伝送器の異常と判断することが
できない。又伝送器の出力信号が規定範囲内にある場合
、その信号が正常か否かは判断できない。An example of water level control with a standby system as shown in FIG. 1 will be explained. The tank water level is detected by transmitter A1 and transmitter B2, respectively. In response to this water level signal, control device A3 and control device B4 operate control valve A5 and control valve B6, respectively, to control the tank water level to a specified water level. Transmitter A1
The tank water level measurement range of transmitter B2 is different from the tank water level measurement range of transmitter B2. Further, the water level setting values of the control device A3 and the control device B4 are different. In other words, if control device A3 is unable to control the water level and the water level rises, control device B, which is a standby control system,
4 starts operation and controls the water level to a specified value. If transmitter A1 and transmitter B1 malfunction, the control device will malfunction and the water level cannot be maintained at the specified value, so the output signal of the transmitter will be outside the normal signal range.
That is, there is a method of detecting that the upper limit or lower limit has been reached and holding the output of the control device to suppress fluctuations in the water level. However, with this method, the upper limit for transmitter A1 and the lower limit for transmitter B2 cannot be determined to be abnormal in the transmitter. Furthermore, if the output signal of the transmitter is within the specified range, it cannot be determined whether the signal is normal or not.
本発明は、プロセス変量を検出する機器の異常の有無を
、診断することにより、制御系の健全性を確保すること
にある。The present invention aims to ensure the health of a control system by diagnosing the presence or absence of an abnormality in equipment that detects process variables.
本発明は、プロセス変量を検出する機器の出力信号値に
より、又プロセス変量を検出する機器の負荷インピーダ
ンスを変化させ、その出力変化状況により異常の有無を
診断する。The present invention changes the load impedance of the device that detects the process variable based on the output signal value of the device that detects the process variable, and diagnoses whether there is an abnormality based on the state of the output change.
本発明の実施例を第２図によシ説明する。 An embodiment of the present invention will be explained with reference to FIG.
伝送器Ａ１の出力信号が、規定範囲以下（下限）となっ
た場合、及び、規定範囲以上（上限）となシ、かつ、伝
送器Ｂ２の出力信号が伝送器Ａ１の１００％出力相当（
ｂ％）以下である場合、伝送器Ａ１が異常であると判断
する方法。When the output signal of transmitter A1 is below the specified range (lower limit), and when it is above the specified range (upper limit), and the output signal of transmitter B2 is equivalent to 100% output of transmitter A1 (
b%) or less, a method for determining that the transmitter A1 is abnormal.
同様に、伝送器Ｂ１の異常は、その出力信号が上限とな
った場合、及び、下限となシ、かつ伝送器Ａ１の出力が
、ａ％以上である場合に異常と判断する。Similarly, the transmitter B1 is determined to be abnormal when its output signal reaches the upper limit, and when the lower limit is reached and the output of the transmitter A1 is a% or more.
また、第３図によシ説明する。Further, this will be explained with reference to FIG.
伝送器１の出力信号回路に、抵抗器４及び、これをバイ
パスするテストスイッチ３を設ける。通常はテストスイ
ッチ３を閉し、抵抗器４を、バイパスしておく。以下診
断方法について述べる。テストスイッチ３を開させると
、伝送器１の負荷インピーダンスは、瞬間的に増加する
が、伝送器１が正常であれば、その出力信号は、テスト
スイッチ３を開する前の値になる様動作するが、異常で
あれば、その出力信号は、負荷インピーダンスが増加し
たことによシ減少する。この現象によシ、伝送器１の異
常診断が行える。The output signal circuit of the transmitter 1 is provided with a resistor 4 and a test switch 3 that bypasses the resistor 4. Normally, the test switch 3 is closed and the resistor 4 is bypassed. The diagnosis method will be described below. When the test switch 3 is opened, the load impedance of the transmitter 1 increases momentarily, but if the transmitter 1 is normal, its output signal will operate to the value before the test switch 3 was opened. However, if abnormal, the output signal will decrease due to the increased load impedance. Based on this phenomenon, abnormality diagnosis of the transmitter 1 can be performed.
本発明によれば、制御装置の入力信号の異常の有無を、
発見することができるので、制御装置の誤動作を防止す
ることができる。According to the present invention, the presence or absence of an abnormality in the input signal of the control device can be determined by
Since this can be detected, malfunctions of the control device can be prevented.
第１図は、待機系をもつタンク水位制御系統図、第２図
は本発明の一実施例の伝送器の出力信号レベルによる異
常診断方法の説明図、第３図は同じく伝送器の出力負荷
インピーダンスを変化させることによる異常診断方法の
説明図である。
１・・・伝送器Ａ、２・・・伝送器Ｂ、３・・・制御装
置Ａ１４・・・制御装ｆｔ１ｔ、＠、５・・・制御装置
Ａ、６・・・制御装置第 １ 図Fig. 1 is a tank water level control system diagram with a standby system, Fig. 2 is an explanatory diagram of an abnormality diagnosis method based on the output signal level of a transmitter according to an embodiment of the present invention, and Fig. 3 is the output load of the transmitter as well. FIG. 3 is an explanatory diagram of an abnormality diagnosis method by changing impedance. 1...Transmitter A, 2...Transmitter B, 3...Control device A14...Control device ft1t, @, 5...Control device A, 6...Control device Fig. 1
Claims (1)
予め定められた設定値との偏差を算出する手段、偏差を
比例積分演算する手段、及び該演算手段の出力信号によ
シ、調節弁を制御する手段を有する制御系に於て、上記
とは別に、プロセス変量を検出する手段の出力信号をモ
ニタする手段、プロセス変量を検出する手段の負荷イン
ピーダンスを変える手段、及び調節弁への出力信号をホ
ールドする手段を設け、プロセス変量を検出する手段の
異常の有無を診断することを特徴とする入力異常診断方
法。1. Means for detecting a process variable, means for calculating the deviation between the process variable and a predetermined set value, means for calculating the deviation by proportional integral, and controlling the control valve based on the output signal of the calculating means. In addition to the above, the control system includes means for monitoring the output signal of the means for detecting the process variable, means for changing the load impedance of the means for detecting the process variable, and means for controlling the output signal to the control valve. 1. An input abnormality diagnosing method, comprising: providing a holding means, and diagnosing the presence or absence of an abnormality in a means for detecting a process variable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57225858A JPS59116811A (en) | 1982-12-24 | 1982-12-24 | Diagnosing method of input abnormality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57225858A JPS59116811A (en) | 1982-12-24 | 1982-12-24 | Diagnosing method of input abnormality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59116811A true JPS59116811A (en) | 1984-07-05 |
Family
ID=16835944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57225858A Pending JPS59116811A (en) | 1982-12-24 | 1982-12-24 | Diagnosing method of input abnormality |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59116811A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6859755B2 (en) | 2001-05-14 | 2005-02-22 | Rosemount Inc. | Diagnostics for industrial process control and measurement systems |
| US6970003B2 (en) | 2001-03-05 | 2005-11-29 | Rosemount Inc. | Electronics board life prediction of microprocessor-based transmitters |
| US9052240B2 (en) | 2012-06-29 | 2015-06-09 | Rosemount Inc. | Industrial process temperature transmitter with sensor stress diagnostics |
| US9207129B2 (en) | 2012-09-27 | 2015-12-08 | Rosemount Inc. | Process variable transmitter with EMF detection and correction |
-
1982
- 1982-12-24 JP JP57225858A patent/JPS59116811A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6970003B2 (en) | 2001-03-05 | 2005-11-29 | Rosemount Inc. | Electronics board life prediction of microprocessor-based transmitters |
| US6859755B2 (en) | 2001-05-14 | 2005-02-22 | Rosemount Inc. | Diagnostics for industrial process control and measurement systems |
| US9052240B2 (en) | 2012-06-29 | 2015-06-09 | Rosemount Inc. | Industrial process temperature transmitter with sensor stress diagnostics |
| US9207129B2 (en) | 2012-09-27 | 2015-12-08 | Rosemount Inc. | Process variable transmitter with EMF detection and correction |
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