JPS6029802A - Process controller - Google Patents

Process controller

Info

Publication number
JPS6029802A
JPS6029802A JP13771483A JP13771483A JPS6029802A JP S6029802 A JPS6029802 A JP S6029802A JP 13771483 A JP13771483 A JP 13771483A JP 13771483 A JP13771483 A JP 13771483A JP S6029802 A JPS6029802 A JP S6029802A
Authority
JP
Japan
Prior art keywords
signal
output
value
comparator
control device
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
JP13771483A
Other languages
Japanese (ja)
Inventor
Tatsuo Hamada
浜田　辰男
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13771483A priority Critical patent/JPS6029802A/en
Publication of JPS6029802A publication Critical patent/JPS6029802A/en
Pending legal-status Critical Current

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
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
    • G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.

Abstract

PURPOSE:To eliminate variation in process value and to perform automatic operation by matching a controller output value with an operating device input value, and performing switching on the basis of deviation detection between a set value and a process value. CONSTITUTION:A process signal P from a detector 7 and a set signal S from a signal setter 1 are compared by a comparator 2a, whose output is inputted to a switch 10a. Both signals are inputted to a comparator setter 8 as well, and when they coincide with each other, a switching signal B passed through a self-holding circuit is inputted to switches 10a and 10b. Then, switching to a side (1) is performed with this signal B. Further, the output of the switch 10b is inputted to an operating device 6 and a comparator 2b through a higher value selector 4. The switches 10a and 10b are placed at sides (2) when plant operation starts, and an operation signal Q passed through the higher value selector 4 is controlled with the output R of a signal generator 5 to the same value as the output signal T of a controller 3. Consequently, the process value varies, and when it coincides with the set value S, the comparator setter 8 operates.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明はプロセス制御装置に係シ、特にプラントの自動
運転を容易にし、プロセス量の変動が発生しないことを
特徴とするプロセス制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a process control device, and more particularly to a process control device that facilitates automatic operation of a plant and that does not cause fluctuations in process quantities.

〔発明の背景〕[Background of the invention]

第１図は、本発明に関連した従来技術を示す。 FIG. 1 shows prior art related to the present invention.

検出器７からのプロセス信号Ｐは、設定器１からの設定
信号Ｓと比較器２により比較され、偏差信号は制御装置
３に入力される。The process signal P from the detector 7 is compared with the setting signal S from the setting device 1 by the comparator 2, and the deviation signal is input to the control device 3.

一方、操作器開信号りと操作器閉信号Ｅは信号発生器５
に入力される。On the other hand, the actuator open signal E and the actuator close signal E are generated by the signal generator 5.
is input.

信号発生器出力信号Ｒと制御装置出力信号Ｔは、高値選
択器４によシ高値が選択され、操作信号Ｑとなシ、操作
管６を動作させる。The high value selector 4 selects the high value of the signal generator output signal R and the control device output signal T, and operates the operation tube 6 in conjunction with the operation signal Q.

この様な構成のプロセス制御装置の制御特性の実施−を
第２図に示す。FIG. 2 shows the implementation of the control characteristics of the process control device having such a configuration.

プラント停止時の初期状態では、プロセス信号Ｐは０と
なっている。したがって、設定信号Ｓとの偏差は−Ｓで
お多制御装置出力信号Ｔは０以下の値に飽和している。In the initial state when the plant is stopped, the process signal P is 0. Therefore, the deviation from the setting signal S is -S, and the output signal T of the controller is saturated to a value of 0 or less.

ｉこで、操作器６Ｆｉ、プラント停止時に全閉となるも
めとする。また、操作器６は、入力信号が１００チで全
閉となるものとする。しだがって、プラント停止時は、
信号発生器５からの出力Ｒを１００チとすることによシ
、操作信号Ｑを１００チとして、操作器６を全閉として
おく。プラント運転開始Ｆの点に鰺いて、操作器開信号
りを信号発生器５に入力すると、信号発生器５の出力Ｒ
は。At this point, it is assumed that the operating device 6Fi is fully closed when the plant is stopped. Further, it is assumed that the operating device 6 is fully closed when the input signal is 100 degrees. Therefore, when the plant is stopped,
By setting the output R from the signal generator 5 to 100 degrees, the operating signal Q is set to 100 degrees, and the operating device 6 is kept fully closed. At the point F when plant operation starts, when the operator open signal is input to the signal generator 5, the output R of the signal generator 5 is
teeth.

Ｆ−Ｇの特性で変化する。操作器６はＦ−Ｇの変化率に
したがって徐開する。プロセス信号Ｐは除徐に上昇し、
設定信号Ｓと同一値になると、制御装置出力信号Ｔは上
昇を始める。Ｋの点を越えると、制御装置出力信号Ｔが
信号発生器出力信号Ｒよシ大きくなる為、信号Ｔが優先
され、制御装置３による制御が開始される。このため、
操作信号Ｑの値は上昇し、操作器６を閉とする方向に動
作させるため、プロセス信号Ｐは減少を始め、設定信号
Ｓとプロセス信号Ｐが同じ値になる様に制御される。It changes depending on the characteristics of FG. The operating device 6 is gradually opened according to the rate of change of FG. The process signal P gradually rises,
When it reaches the same value as the setting signal S, the controller output signal T begins to rise. When the point K is exceeded, since the control device output signal T becomes larger than the signal generator output signal R, the signal T is given priority and control by the control device 3 is started. For this reason,
The value of the operation signal Q increases and the operation device 6 is operated in the direction of closing, so the process signal P starts to decrease and is controlled so that the setting signal S and the process signal P have the same value.

プラントの停止または、プロセス量の制御を停止する場
合には、操作器閉信号Ｅを信号発生器５に入力させるこ
とによシ、信号発生器出力信号Ｒを上昇させる。この時
の信号凡の特性は、Ｈ−Ｉの様になる。When stopping the plant or stopping control of the process amount, the signal generator output signal R is increased by inputting the operator close signal E to the signal generator 5. The characteristic of the signal at this time becomes H-I.

Ｌの点で、信号発生器出力信号Ｉｔが制御装置出力信号
ＴｊＪｌ大きくなるため、信号発生器出力信号Ｒによシ
、操作器６は全閉となる。At point L, the signal generator output signal It becomes larger than the control device output signal TjJl, so that the signal generator output signal R causes the actuator 6 to be fully closed.

この様な装置においては、第２図、Ｊの点で、プロセス
量が設定値に一致したにもかかわらず、制御装置による
制御に移行できないため、Ｊ−に間でプロセス量がオー
バーシュートとなると共に、Ｋの点で操作器への出力信
号が急反転するため、プロセス量への影響が大きく、ノ
・ンチング等を生じる。In such a device, even though the process amount matches the set value at point J in Figure 2, the control device cannot shift to control, so the process amount overshoots between J-. At the same time, the output signal to the operating device suddenly reverses at point K, which has a large effect on the process amount, resulting in notching and the like.

また、操作器が全閉の時、プロセス量と設定値の偏差値
によシ、制御装置の出力は０以下に積分飽和している。Further, when the operating device is fully closed, the output of the control device is integrally saturated to 0 or less depending on the deviation value between the process amount and the set value.

この為、プロセス量が上昇した場合の応答が遅く力る。For this reason, the response when the process amount increases is slow.

この様に、プロセス量の大きな変動、積分飽和現象は、
プラントの運転上野オしくない。In this way, large fluctuations in process quantities and integral saturation phenomena are
Plant operation is not good.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、制御装置出力値と操作器入力値とのつ
き合わせおよび、設定値とプロセス量の偏差検出による
切換を行なうことによシ、プロセスｔの変動をなくし、
プラントの自動運転に最適なプロセス制御装置を提供す
るものである。An object of the present invention is to eliminate fluctuations in the process t by matching the control device output value and the actuator input value and switching by detecting the deviation between the set value and the process amount.
It provides a process control device that is optimal for automatic plant operation.

〔発明の概要〕[Summary of the invention]

本発明は、圧力、温度、流量等のプロセス量を制御する
プロセス制御装置において、設定器、切換器、高値選択
器または低値選択器、比較器等を用いて、制御装置の積
分飽和を防止し、プラントまたは制御系の自動運転を可
能としたことを特徴とするものである。The present invention uses a setting device, a switch, a high value selector or a low value selector, a comparator, etc. in a process control device that controls process quantities such as pressure, temperature, flow rate, etc. to prevent integral saturation of the control device. It is characterized by enabling automatic operation of the plant or control system.

〔発明の実施例〕[Embodiments of the invention]

第３図は、本発明の実施例を示す。 FIG. 3 shows an embodiment of the invention.

検出器７からのプロセス信号Ｐと信号設定器、１からの
設定信号Ｓは比較器２ａによシ比較され、偏差信号は切
換器１０ａに入力される。また、プロセス信号Ｐと設定
信号Ｓ稈比較設定器８に入力され、プロセス信号Ｐと設
定信号Ｓが一致した一点で切換信号Ａを出力し、自己保
持回路を形成し、切換信号Ｂとなり、切換器１０ａと１
０ｂに入力される。ここで、自己保持回路は、リセット
回路９からのリセット信号Ｃによシリセットされる。The process signal P from the detector 7 and the setting signal S from the signal setter 1 are compared by the comparator 2a, and the deviation signal is input to the switch 10a. In addition, the process signal P and the setting signal S are input to the culm comparison and setting device 8, and at one point where the process signal P and the setting signal S match, a switching signal A is output, forming a self-holding circuit, and becoming the switching signal B, which causes switching. vessels 10a and 1
Input to 0b. Here, the self-holding circuit is reset by a reset signal C from the reset circuit 9.

また、切換信号Ｂの入力によシ、切換器１０ａおよび１
０ｂは■側に切換わるものとする。In addition, by inputting the switching signal B, the switching devices 10a and 1
It is assumed that 0b is switched to the ■ side.

切換器１０ａの出力は制御装置３に入力され、。The output of the switch 10a is input to the control device 3.

演算処理された後、切換器ＬＯｂおよび比較器２ｂに出
力される。After being subjected to arithmetic processing, it is output to the switch LOb and the comparator 2b.

切換器１０ｂの出力は高値選択器４を通して、操作器６
に入力されると共に、比較器２ｂにも入力される。The output of the switch 10b is passed through the high value selector 4 to the operating device 6.
It is also input to the comparator 2b.

比較器２ａの出力は切換器１０ａに入力される。The output of comparator 2a is input to switch 10a.

一方、信号発生器５は、操作器開信号りまたは操作器閉
信号Ｅの入力によシ、高値選択器４および切換器１０ｂ
に信号を出力する。On the other hand, the signal generator 5 is activated by the input of the operator open signal or the operator close signal E, and the high value selector 4 and the switch 10b.
Outputs a signal to.

以上の様な構成の本発明について、第４図で説明する。The present invention having the above configuration will be explained with reference to FIG. 4.

プラント停止または本制御系停止時のプロセス信号Ｐは
０であシ、操作器６は全閉となる。When the plant is stopped or the main control system is stopped, the process signal P is 0, and the operating device 6 is fully closed.

操作器６を全閉とするためには、ここでは操作器への入
力を１００チとするものとする。（この入力値は操作器
の種類によシ異なる。）また、この状態では、切換信号
回路の自己保持回路は、リセット信号９によシリセット
されているものとし、切換器１０ａ、１０ｂは■側に切
換わっているものとする。In order to fully close the operating device 6, the input to the operating device is assumed to be 100 channels. (This input value differs depending on the type of actuator.) In this state, it is assumed that the self-holding circuit of the switching signal circuit has been reset by the reset signal 9, and the switching devices 10a and 10b are on the ■ side. Assume that it has been switched to .

したがって、プラント停止または本制御系停止時の各信
号はＰ＝Ｏ，Ｑ＝１００チ、Ｒ＝１００チ、Ｔ＝１００
％となる。Therefore, each signal when the plant is stopped or this control system is stopped is P=O, Q=100ch, R=100ch, T=100
%.

プラント運転開始または本制御系運転開始を行なうため
、Ｆ点において、操作器開信号″′Ｄ″を信号発生器５
に入力する。信号発生器５からの出力Ｒは、あらかじめ
設定され九Ｆ−Ｇの特性で変化する。このため操作器６
はＦ−Ｇの特性にょシ徐開する。また、操作信号Ｑは比
較器２ｂを通して制御装置３に入力され、制御装置３の
出力信号Ｔが操作信号と同じ値になるように制御される
。In order to start the plant operation or start the main control system operation, the operator open signal "'D" is sent to the signal generator 5 at point F.
Enter. The output R from the signal generator 5 is set in advance and changes with nine F-G characteristics. For this reason, the operating device 6
gradually develops due to the characteristics of FG. Further, the operation signal Q is input to the control device 3 through the comparator 2b, and is controlled so that the output signal T of the control device 3 has the same value as the operation signal.

この様に、操作器出力信号Ｑと制御装置出力信号Ｔを常
に一致させておくことは、切換器１０ａ。In this way, the switch 10a is used to always keep the operating device output signal Q and the control device output signal T consistent.

１０ｂが制御ループを構成された時の信号の偏差をなく
すものである。10b is used to eliminate signal deviation when the control loop is configured.

操作器６が徐開されると、プロセス量も変化し、検出器
７からのプロセス信号Ｐも上昇する。When the operating device 6 is gradually opened, the process amount also changes, and the process signal P from the detector 7 also increases.

プロセス信号Ｐと設定信号Ｓが５点で一致すると、比較
設定器８が動作し、切換信号Ａ、Ｂが出力され、切換器
１０ａ、１０ｂが■側に切換わシ、制御装置３による制
御ループが構成され、制御が開始される。When the process signal P and the setting signal S match at five points, the comparator and setting device 8 is activated, the switching signals A and B are output, and the switching devices 10a and 10b are switched to the ■ side.The control loop by the control device 3 is configured and control begins.

この時、制御装置３の出力信号Ｔと操作器への入力信号
Ｑが一致しているためスムーズな切換が可能である。At this time, since the output signal T of the control device 3 and the input signal Q to the operating device match, smooth switching is possible.

プラント停止または、本制御系停止時は、操作器閉信号
Ｅを信号発生器５に入力することによシ行なう。When the plant is stopped or the main control system is stopped, this is done by inputting the operating device close signal E to the signal generator 5.

Ｈ点において、操作器閉信号ＩＩ　Ｄ　７１を信号発生
器５に入力する。信号発生器５からの出力Ｒはあらかじ
め設定されたＨ−Ｉの特性によ多増加する。At point H, the actuator close signal II D 71 is input to the signal generator 5. The output R from the signal generator 5 increases according to the preset H-I characteristic.

Ｌ点で制御装置３の出力信号Ｔと一致し、信号発生器出
力信号Ｒが制御装置出力信号Ｔ、ｌ：り大きく々ると、
高値選択器４によシ、信号発生器出力信号Ｒが選択され
るため、操作器への操作信号Ｑは信号Ｒに従って増加し
、操作器を徐閉し、全閉を行なう。When the output signal T of the control device 3 coincides with the output signal T of the control device 3 at the point L, and the signal generator output signal R becomes larger than the control device output signal T,l:
Since the signal generator output signal R is selected by the high value selector 4, the operation signal Q to the operating device increases in accordance with the signal R, and the operating device is gradually closed and then fully closed.

したがって、プロセス信号Ｐが減少し、比較器２ａの出
力が−となるため、制御装置３の出力Ｔは減少し、０以
下に積分飽和する。Therefore, the process signal P decreases and the output of the comparator 2a becomes -, so the output T of the control device 3 decreases and becomes integrated and saturated below 0.

この状態では、次にプラント運転、制御系運転開始時に
は支障があるため、リセット回路９からの信号によシ、
切換回路の自己保持をリセットし、切換器１０ａ、１０
ｂを■側とする。この操作によ如、制御装置３の入力は
、制御装置３の出力信号Ｔと操作器への操作信号Ｑの比
較を行なう比較器からの信号に切換わるため、制御装置
出力信号Ｔは、操作信号Ｑと一致するまで増加し、１０
０チで一定となる。In this state, there will be a problem when the next plant operation or control system operation starts, so the signal from the reset circuit 9 will not be activated.
The self-holding of the switching circuit is reset, and the switching circuits 10a, 10
Let b be the ■ side. As a result of this operation, the input of the control device 3 is switched to the signal from the comparator that compares the output signal T of the control device 3 and the operation signal Q to the operation device, so that the control device output signal T is increases until it matches signal Q, 10
It becomes constant at 0chi.

どの様な動作により次の運転への対応を行なえるように
する。What kind of actions should be taken to prepare for the next operation.

〔発明の効果〕〔Effect of the invention〕

以上詳述した如く本発明によれば、圧力、温度。 As detailed above, according to the present invention, pressure, temperature.

流量等のプロセス量を制御する装置において、プラント
停止中または制御系停止中におけるプロセス量と設定値
の偏差による積分飽和を防止すると共に、制御装置出力
信号の追従性をよくシ、プロセス量の変動を防止するこ
とができる。In devices that control process quantities such as flow rates, this prevents integral saturation due to deviations between process quantities and set values when the plant is stopped or the control system is stopped, and also improves followability of control device output signals and prevents fluctuations in process quantities. can be prevented.

また、操作器への出力を信号発生器からの信号で制御す
ることによシブラント運転の自動化、制御系運転の自動
起動を容易にすることができる。In addition, by controlling the output to the operating device with the signal from the signal generator, it is possible to automate the sibrandt operation and facilitate automatic start-up of the control system operation.

この様に、プラントの自動化、省力化に最適でアシ、プ
ロセス量の変動防止によ多制御性を向上させることがで
きる。In this way, it is ideal for plant automation and labor saving, and can improve controllability by preventing fluctuations in process volume.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来技術によるプロセス制御装置の系統図、第
２図は従来技術によるプロセス制御装置の制御特性図、
第３図は本発明の一実施例のプロセス制御装置の系統図
、第４図は同じくプロセス制御装置の制御特性図である
。 １・・・信号設定器、２，２ａ−ｂ・・・比較器、３・
・・制御装置、４・・・高値選択器、５・・・信号発生
器、６・・・操作器、７・・・検出器、８・・・比較設
定器、９・・・リセット回路、１０ａ〜１０ｂ・・・切
換器、Ａ、Ｂ・・・切換信号、Ｃ・・・リセット信号、
Ｄ・・・操作器開信号、Ｅ・・・操作器閉信号、Ｐ・・
・プロセス信号、Ｑ・・・操作信号、Ｒ・・・信号発生
器出力信号、Ｓ・・・設定信号。 第２図FIG. 1 is a system diagram of a process control device according to the prior art, FIG. 2 is a control characteristic diagram of the process control device according to the prior art,
FIG. 3 is a system diagram of a process control device according to an embodiment of the present invention, and FIG. 4 is a control characteristic diagram of the process control device. 1... Signal setting device, 2, 2a-b... Comparator, 3.
... Control device, 4... High value selector, 5... Signal generator, 6... Operator, 7... Detector, 8... Comparison setting device, 9... Reset circuit, 10a-10b...Switcher, A, B...Switching signal, C...Reset signal,
D...Controller open signal, E...Controller close signal, P...
- Process signal, Q...operation signal, R...signal generator output signal, S...setting signal. Figure 2

Claims (1)

【特許請求の範囲】 １、圧力、温度、流量等のプロセス量を制御するプロセ
ス制御装置において、設定器、切換器、高値選択器また
は低値選択器、比較器等を用いて。 制御装置の積分飽和を防止し、プラントまたは制′御系
の自動運転を可能としたことを％徴とするプロセス制御
装置。[Claims] 1. In a process control device that controls process quantities such as pressure, temperature, flow rate, etc., using a setting device, a switch, a high value selector or a low value selector, a comparator, etc. A process control device that prevents integral saturation of the control device and enables automatic operation of the plant or control system.
JP13771483A 1983-07-29 1983-07-29 Process controller Pending JPS6029802A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13771483A JPS6029802A (en) 1983-07-29 1983-07-29 Process controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13771483A JPS6029802A (en) 1983-07-29 1983-07-29 Process controller

Publications (1)

Publication Number Publication Date
JPS6029802A true JPS6029802A (en) 1985-02-15

Family

ID=15205101

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13771483A Pending JPS6029802A (en) 1983-07-29 1983-07-29 Process controller

Country Status (1)

Country Link
JP (1) JPS6029802A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6480454A (en) * 1987-09-22 1989-03-27 Japan Res Dev Corp Dust collecting element for electrostatic precipitator and dust collecting method using said element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6480454A (en) * 1987-09-22 1989-03-27 Japan Res Dev Corp Dust collecting element for electrostatic precipitator and dust collecting method using said element

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