JP2023017350A - control system - Google Patents

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JP2023017350A
JP2023017350A JP2021121570A JP2021121570A JP2023017350A JP 2023017350 A JP2023017350 A JP 2023017350A JP 2021121570 A JP2021121570 A JP 2021121570A JP 2021121570 A JP2021121570 A JP 2021121570A JP 2023017350 A JP2023017350 A JP 2023017350A
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control value
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indicating controller
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JP7207466B1 (en
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将光 会田
Masamitsu Aida
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Kurita Water Industries Ltd
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    • 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
    • G05B19/00—Program-control systems
    • G05B19/02—Program-control systems electric
    • G05B19/04—Program control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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Abstract

【課題】指示調節計やＰＬＣの故障、メンテナンスの場合でも、安定した制御状態を維持できる制御システムを提供する。【解決手段】制御システムは、センサから測定値を取得し、該測定値と目標値とを比較し、比較結果に基づいて制御対象機器へ第１制御値を送信する指示調節計と、前記指示調節計から前記第１制御値を取得し、前記センサから前記測定値を取得し、該測定値と前記目標値とを比較し、比較結果に基づいて第２制御値を生成するＰＬＣ（プログラマブルロジックコントローラ）と、を備える。前記ＰＬＣは、前記制御対象機器の制御主体が前記指示調節計の場合は、前記指示調節計が出力した前記第１制御値が前記制御対象機器に与えられるようにし、該指示調節計に異常が発生すると、該第１制御値と同じ値の制御値を出力して前記制御対象機器に与える。【選択図】図１A control system capable of maintaining a stable control state even in the event of failure or maintenance of an indicating controller or PLC is provided. A control system includes an indicating controller that acquires a measured value from a sensor, compares the measured value with a target value, and transmits a first control value to a device to be controlled based on the comparison result; PLC (programmable logic) that acquires the first control value from the controller, acquires the measured value from the sensor, compares the measured value with the target value, and generates a second control value based on the comparison result a controller); When the control subject of the controlled device is the indicating controller, the PLC provides the first control value output by the indicating controller to the controlled device, and the indicating controller detects an abnormality. When it occurs, a control value that is the same as the first control value is output and given to the device to be controlled. [Selection drawing] Fig. 1

Description

本発明は、指示調節計を用いた制御システムに関する。 The present invention relates to control systems using indicating controllers.

温度・湿度・圧力・流量等のプロセス量を目標値に一致させるように演算、制御を行うデジタル指示調節計が広く使用されている。特許文献１に記載されているようなデジタル指示調節計は、入力処理部、制御演算部、出力処理部、通信処理部、操作・表示部、データベース等の機能要素が１個の筐体に格納され、コンパクトな構成をとるが、シーケンス処理機能は備えていない。シーケンス制御を実現するために、指示調節計と、ＰＬＣ（Programmable Logic Controller）等のシーケンサとが組み合わせて用いられている。従来、指示調節計とＰＬＣとを組み合わせた制御システムにおいても、指示調節計が故障すると特定機器の制御が行えなくなっていた。 Digital indicating controllers are widely used for calculating and controlling process variables such as temperature, humidity, pressure, and flow rate so as to match target values. In the digital indicating controller as described in Patent Document 1, functional elements such as an input processing unit, a control calculation unit, an output processing unit, a communication processing unit, an operation/display unit, and a database are housed in one housing. It has a compact structure, but does not have a sequence processing function. In order to realize sequence control, an indicating controller is used in combination with a sequencer such as a PLC (Programmable Logic Controller). Conventionally, even in a control system that combines an indicating controller and a PLC, when the indicating controller fails, it has become impossible to control specific equipment.

一方で、工場やプラントにおいては、顧客（特に超純水設備における顧客）に対してユーティリティー(超純水)を安定に供給する義務があり、設備を３６５日稼働させ、常時安定した質（水質）で提供する必要がある。従来の制御システムでは、指示調節計が故障して制御不能となると、質や量がぶれたり、工場の運転を一旦停止する必要が生じたりして、ユーティリティの安定供給に問題があった。 On the other hand, factories and plants have an obligation to provide a stable supply of utilities (ultrapure water) to their customers (especially ultrapure water equipment customers). ) must be provided. In the conventional control system, if the indicating controller fails and control becomes impossible, the quality and quantity may fluctuate, and the plant operation may have to be temporarily stopped, causing problems in the stable supply of utilities.

特許第４９６７９３９号公報Japanese Patent No. 4967939

制御機器の故障への対策として、制御機器の二重化を実施することもあったが、各制御機器が独自の制御を行っているため、制御出力状態が一致せず、一方の機器が故障し、制御を行う機器が切り替わった際に、制御対象に全く異なる制御出力が与えられ、制御状態が不安定となっていた。 As a countermeasure against the failure of the control equipment, we sometimes implemented duplication of the control equipment, but since each control equipment performs its own control, the control output status does not match, and one of the equipment breaks down. When the device to be controlled is switched, a completely different control output is given to the controlled object, and the control state becomes unstable.

本発明は、上記従来の問題を鑑みてなされたものであり、指示調節計やＰＬＣの故障、メンテナンスの場合でも、安定した制御状態を維持できる制御システムを提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a control system capable of maintaining a stable control state even in the event of failure or maintenance of an indicating controller or PLC.

本発明の制御システムは、センサから測定値を取得し、該測定値と目標値とを比較し、比較結果に基づいて制御対象機器へ第１制御値を送信する指示調節計と、前記指示調節計から前記第１制御値を取得し、前記センサから前記測定値を取得し、該測定値と前記目標値とを比較し、比較結果に基づいて第２制御値を生成するＰＬＣ（プログラマブルロジックコントローラ）と、を備え、前記ＰＬＣは、前記制御対象機器の制御主体が前記指示調節計の場合は、前記指示調節計が出力した前記第１制御値が前記制御対象機器に与えられるようにし、該指示調節計に異常が発生すると、該第１制御値と同じ値の制御値を出力して前記制御対象機器に与えるものである。 The control system of the present invention includes an indicator controller that acquires a measured value from a sensor, compares the measured value with a target value, and transmits a first control value to a device to be controlled based on the comparison result; A programmable logic controller (PLC) that obtains the first control value from a meter, obtains the measured value from the sensor, compares the measured value with the target value, and generates a second control value based on the comparison result. ), wherein the PLC provides the first control value output by the indicating controller to the controlled device when the controlling subject of the controlled device is the indicating controller, and When an abnormality occurs in the indicating controller, a control value that is the same as the first control value is output and given to the device to be controlled.

本発明の一態様による制御システムにおいて、前記ＰＬＣは、前記指示調節計に異常が発生して、前記第１制御値と同じ値の制御値を出力した後、前記第２制御値との差分が小さくなるように出力制御値を調整する。 In the control system according to one aspect of the present invention, the PLC outputs a control value that is the same as the first control value when an abnormality occurs in the indicating controller, and then the difference from the second control value is Adjust the output control value so that it becomes smaller.

本発明の一態様による制御システムにおいて、前記ＰＬＣは、前記制御対象機器の制御主体が該ＰＬＣの場合は、前記第２制御値を前記制御対象機器に与えると共に、該第２制御値を前記指示調節計へ出力し、前記指示調節計は、前記ＰＬＣに異常が発生すると、前記第２制御値と同じ値の制御値を出力して前記制御対象機器に与える。 In the control system according to one aspect of the present invention, the PLC provides the second control value to the controlled device when the control subject of the controlled device is the PLC, and provides the second control value to the controlled device. When an abnormality occurs in the PLC, the indicating controller outputs a control value that is the same as the second control value and gives it to the device to be controlled.

本発明の一態様による制御システムにおいて、前記指示調節計は、前記ＰＬＣに異常が発生して、前記第２制御値と同じ値の制御値を出力した後、前記第１制御値との差分が小さくなるように出力制御値を調整する。 In the control system according to one aspect of the present invention, the indicating controller outputs a control value that is the same as the second control value when an abnormality occurs in the PLC, and then the difference from the first control value is Adjust the output control value so that it becomes smaller.

本発明の一態様による制御システムにおいて、前記指示調節計及び前記ＰＬＣは、それぞれ、第１センサ及び第２センサから測定値を取得し、該第１センサからの測定値を用いて前記第１制御値及び前記第２制御値を生成し、該第１センサの測定値が所定範囲外となった場合、該第２センサからの測定値を用いて該第１制御値及び該第２制御値を生成する。 In the control system according to one aspect of the present invention, the indicating controller and the PLC acquire measurements from a first sensor and a second sensor, respectively, and use the measurements from the first sensor to control the first control. and the second control value, and when the measured value of the first sensor falls outside a predetermined range, the measured value from the second sensor is used to generate the first control value and the second control value Generate.

本発明によれば、指示調節計やＰＬＣの故障、メンテナンスの場合でも、安定した制御状態を維持できる。 According to the present invention, a stable control state can be maintained even in the event of failure or maintenance of the indicating controller or PLC.

本発明の実施形態に係る制御システムの概略構成図である。1 is a schematic configuration diagram of a control system according to an embodiment of the present invention; FIG. 同実施形態に係るＰＬＣ及び指示調節計の機能ブロック図である。It is a functional block diagram of a PLC and an indicating controller according to the same embodiment.

以下に本発明の実施の形態を詳細に説明する。 Embodiments of the present invention will be described in detail below.

図１に示すように、本実施形態に係る制御システムは、ＰＬＣ（Programmable
Logic Controller、プログラマブルロジックコントローラ）１及び指示調節計２を備え、センサ４からの測定値を取得し、測定値が目標値になるように制御対象機器５を制御するものである。センサ４及び制御対象機器５は特に限定されず、例えばセンサ４は流量、送水圧力、薬液濃度、温度等を測定するものであり、制御対象機器５は、弁、ポンプ、ヒータ等である。 As shown in FIG. 1, the control system according to this embodiment includes a PLC (Programmable
It has a logic controller (programmable logic controller) 1 and an indicating controller 2, obtains a measured value from a sensor 4, and controls a device 5 to be controlled so that the measured value becomes a target value. The sensor 4 and the device 5 to be controlled are not particularly limited. For example, the sensor 4 measures flow rate, water pressure, concentration of chemicals, temperature, etc., and the device 5 to be controlled is a valve, a pump, a heater, and the like.

ＰＬＣ１及び指示調節計２は、それぞれ、センサ４からの測定値（センサ測定値）を取得し、ＰＩＤ制御等の演算を行い、測定値と目標値とが一致するように、制御対象機器５へ制御値（操作値）を出力する。ＰＬＣ１は切替器３を制御し、制御対象機器５に対して、ＰＬＣ１及び指示調節計２のどちらから出力された制御値を与えるかを切り替える。ＰＬＣ１及び指示調節計２に設定される目標値は例えば同じ値である。 The PLC 1 and the indicating controller 2 each acquire the measured value (sensor measured value) from the sensor 4, perform calculations such as PID control, and send the data to the controlled device 5 so that the measured value and the target value match. Outputs the control value (manipulated value). The PLC 1 controls the switch 3 to switch which of the PLC 1 and the indicating controller 2 outputs the control value to the controlled device 5 . The target values set in the PLC 1 and the indicating controller 2 are, for example, the same value.

図２に示すように、指示調節計２は、演算部２０、第１入力部２１、第２入力部２２、制御値出力部２３、２４及び異常検知部２５を備える。 As shown in FIG. 2 , the indicating controller 2 includes a calculation section 20 , a first input section 21 , a second input section 22 , control value output sections 23 and 24 and an abnormality detection section 25 .

演算部２０は、第１入力部２１を介して入力されたセンサ測定値を用いてＰＩＤ制御演算を行い、制御値（第１制御値）を生成する。 The calculation unit 20 performs PID control calculation using the sensor measurement value input via the first input unit 21 to generate a control value (first control value).

制御値出力部２３は、制御対象機器５の制御をＰＬＣ１が行う場合は、第２入力部２２を介して入力されたＰＬＣ１からの制御値を制御対象機器５へ出力する。 The control value output unit 23 outputs the control value from the PLC 1 input via the second input unit 22 to the control target device 5 when the PLC 1 controls the control target device 5 .

また、制御値出力部２３は、制御対象機器５の制御を指示調節計２が行う場合は、演算部２０が生成した制御値を制御対象機器５へ出力する。 Further, the control value output unit 23 outputs the control value generated by the calculation unit 20 to the control target device 5 when the indication controller 2 controls the control target device 5 .

制御値出力部２４は、制御対象機器５の制御をＰＬＣ１が行う場合は、第２入力部２２を介して入力されたＰＬＣ１からの制御値を、ＰＬＣ１へ出力する。 The control value output unit 24 outputs the control value from the PLC 1 input via the second input unit 22 to the PLC 1 when the PLC 1 controls the device 5 to be controlled.

また、制御値出力部２４は、制御対象機器５の制御を指示調節計２が行う場合は、演算部２０が生成した制御値をＰＬＣ１へ出力する。 Further, the control value output unit 24 outputs the control value generated by the calculation unit 20 to the PLC 1 when the indicating controller 2 controls the controlled device 5 .

異常検知部２５は、指示調節計２に発生する故障等の異常を検知する。異常検知部２５は、異常の発生を検知すると、異常検知信号をＰＬＣ１へ出力する。 The abnormality detection unit 25 detects an abnormality such as a failure occurring in the indicating controller 2 . The abnormality detection unit 25 outputs an abnormality detection signal to the PLC 1 when detecting the occurrence of an abnormality.

ＰＬＣ１は、演算部１０、第１入力部１１、第２入力部１２、制御値出力部１３、１４、監視部１５及び切替部１６を備える。 The PLC 1 includes an arithmetic unit 10 , a first input unit 11 , a second input unit 12 , control value output units 13 and 14 , a monitoring unit 15 and a switching unit 16 .

演算部１０は、第１入力部１１を介して入力されたセンサ測定値を用いてＰＩＤ制御演算を行い、制御値（第２制御値）を生成する。 The calculation unit 10 performs PID control calculation using the sensor measurement value input via the first input unit 11 to generate a control value (second control value).

制御値出力部１３は、制御対象機器５の制御を指示調節計２が行う場合は、第２入力部１２を介して入力された指示調節計２からの制御値を制御対象機器５へ出力する。 When the indicating controller 2 controls the controlled device 5 , the control value output unit 13 outputs the control value from the indicating controller 2 input via the second input unit 12 to the controlled device 5 . .

また、制御値出力部１３は、制御対象機器５の制御をＰＬＣ１が行う場合は、演算部１０が生成した制御値を制御対象機器５へ出力する。 Moreover, the control value output unit 13 outputs the control value generated by the calculation unit 10 to the control target device 5 when the PLC 1 controls the control target device 5 .

制御値出力部１４は、制御対象機器５の制御を指示調節計２が行う場合は、第２入力部１２を介して入力された指示調節計２からの制御値を、指示調節計２へ出力する。 When the indicating controller 2 controls the controlled device 5, the control value output unit 14 outputs the control value from the indicating controller 2 input via the second input unit 12 to the indicating controller 2. do.

また、制御値出力部１４は、制御対象機器５の制御をＰＬＣ１が行う場合は、演算部１０が生成した制御値を指示調節計２へ出力する。 Further, the control value output unit 14 outputs the control value generated by the calculation unit 10 to the indicating controller 2 when the PLC 1 controls the controlled device 5 .

監視部１５は、指示調節計２の異常検知部２５から異常検知信号を受信し、指示調節計２の状態を監視する。 The monitoring unit 15 receives an abnormality detection signal from the abnormality detection unit 25 of the indicating controller 2 and monitors the state of the indicating controller 2 .

切替部１６は、切替器３を制御して、制御対象機器５に与えられる制御値を切り替える。すなわち、切替部１６は、制御対象機器５の制御を指示調節計２が行う場合、制御値出力部２３から出力された制御値が制御対象機器５に与えられるようにする。一方、切替部１６は、制御対象機器５の制御をＰＬＣ１が行う場合、制御値出力部１３から出力された制御値が制御対象機器５に与えられるようにする。 The switching unit 16 controls the switching device 3 to switch the control value given to the controlled device 5 . That is, when the indicating controller 2 controls the controlled device 5 , the switching unit 16 causes the control value output from the control value output unit 23 to be given to the controlled device 5 . On the other hand, when the PLC 1 controls the control target device 5 , the switching unit 16 allows the control value output from the control value output unit 13 to be given to the control target device 5 .

切替部１６は、指示調節計２が制御対象機器５の制御を行っている時に指示調節計２に異常が発生した場合、ＰＬＣ１の制御値出力部１３から出力された制御値が制御対象機器５に与えられるように切り替える。 If an abnormality occurs in the indicating controller 2 while the indicating controller 2 is controlling the controlled device 5 , the switching unit 16 switches the control value output from the control value output unit 13 of the PLC 1 to the controlled device 5 . switch to be given to

上述したように、指示調節計２が制御対象機器５の制御を行っている間、制御値出力部１３は、第２入力部１２を介して入力された指示調節計２からの制御値を制御対象機器５へ出力している。そのため、指示調節計２に異常が発生し、制御主体を指示調節計２からＰＬＣ１へ切り替えた際、制御値出力部１３の出力制御値は、指示調節計２の出力制御値と同じになっており、制御対象機器５に与えられる制御値の変動が抑えられる。その後、指示調節計２の出力制御値を引き継いで演算部１０が制御値を演算・生成することで、ＰＬＣ１からの出力制御値が安定した制御状態を維持できる。 As described above, while the indicating controller 2 is controlling the controlled device 5, the control value output unit 13 controls the control value from the indicating controller 2 input via the second input unit 12. It is output to the target device 5. Therefore, when an abnormality occurs in the indicating controller 2 and the control subject is switched from the indicating controller 2 to the PLC 1, the output control value of the control value output section 13 becomes the same as the output control value of the indicating controller 2. Therefore, fluctuations in the control value given to the controlled device 5 are suppressed. After that, the output control value from the indicating controller 2 is taken over and the calculation unit 10 calculates and generates the control value, so that the control state in which the output control value from the PLC 1 is stable can be maintained.

切替部１６は、ＰＬＣ１が制御対象機器５の制御を行っている時にＰＬＣ１に異常が発生した場合、指示調節計２の制御値出力部２３から出力された制御値が制御対象機器５に与えられるように切り替える。ＰＬＣ１の異常は、電源オフに伴うＰＬＣ１の停止や、ＡＯユニットのエラー等である。 When an abnormality occurs in the PLC 1 while the PLC 1 is controlling the controlled device 5, the switching unit 16 provides the controlled device 5 with the control value output from the control value output unit 23 of the indicating controller 2. switch to An abnormality of the PLC 1 is a stoppage of the PLC 1 due to power off, an error of the AO unit, or the like.

上述したように、ＰＬＣ１が制御対象機器５の制御を行っている間、ＰＬＣ１の制御値出力部１４は、演算部１０が生成した制御値を指示調節計２へ出力する。そのため、ＰＬＣ１に異常が発生し、制御主体をＰＬＣ１から指示調節計２へ切り替えた際、制御値出力部２３がＰＣＬ１の出力制御値と同じ値を出力することで、制御対象機器５に与えられる制御値の変動が抑えられる。その後、ＰＬＣ１の出力制御値を引き継いで演算部２０が制御値を演算・生成することで、指示調節計２からの出力制御値が安定した制御状態を維持できる。 As described above, while the PLC 1 is controlling the device 5 to be controlled, the control value output section 14 of the PLC 1 outputs the control value generated by the calculation section 10 to the indicating controller 2 . Therefore, when an abnormality occurs in the PLC 1 and the control subject is switched from the PLC 1 to the indicating controller 2, the control value output unit 23 outputs the same value as the output control value of the PCL 1, which is given to the controlled device 5. Fluctuations in control values are suppressed. After that, the output control value from the PLC 1 is inherited and the calculation unit 20 calculates and generates the control value, so that the output control value from the indicating controller 2 can maintain a stable control state.

このように、本実施形態によれば、制御対象機器５の制御を行う機器を、ＰＬＣ１及び指示調節計２の二重化回路とし、ＰＬＣ１及び指示調節計２の一方の機器が制御対象機器５の制御を行っている間、ＰＩＤ制御演算により生成した制御値を他方の機器へも出力し、機器間で同期をとっている。そのため、例えば、制御主体である指示調節計２に異常が生じて、制御主体をＰＬＣ１へ切り替える際、ＰＬＣ１は指示調節計２が出力していた制御値と同じ値を継続して出力できるため、シームレスな切り替えが可能となり、制御対象機器５に与えられる制御値の変動を抑制し、安定した制御状態を維持できる。 Thus, according to the present embodiment, the device that controls the controlled device 5 is a redundant circuit of the PLC 1 and the indicating controller 2, and one of the PLC 1 and the indicating controller 2 controls the controlled device 5. is being performed, the control value generated by the PID control calculation is also output to the other device, and the devices are synchronized. Therefore, for example, when an abnormality occurs in the indicating controller 2, which is the controlling subject, and the controlling subject is switched to the PLC 1, the PLC 1 can continue to output the same control value as the indicating controller 2 has output. Seamless switching becomes possible, fluctuations in the control value given to the controlled device 5 can be suppressed, and a stable control state can be maintained.

制御対象機器５の制御を行っている一方の機器に異常が発生し、制御主体を他方の機器に切り替えた後、この一方の機器の異常が解消して復旧した場合、制御主体は他方の機器のままとしてもよいし、復旧した機器に戻してもよい。運転初期時にＰＬＣ１と指示調節計２のどちらを制御主体とするかは、操作盤に取り付けられた選択スイッチで選択してもよいし、中央監視ＰＣの遠隔操作で選択してもよい。 If an abnormality occurs in one of the devices controlling the controlled device 5 and the control subject is switched to the other device, and the abnormality in the one device is resolved and the device recovers, the control subject is the other device. You can leave it as is, or you can return it to the recovered device. Which of the PLC 1 and the indicating controller 2 is to be controlled at the initial stage of operation may be selected by a selection switch attached to the operation panel, or may be selected by remote control of the central monitoring PC.

上記実施形態では、制御主体の機器に異常が発生した際に、制御主体を他方の機器に切り替える例について説明したが、切り替えのタイミングは異常発生に限定されず、メンテナンスの実施等でもよい。 In the above embodiment, an example of switching the control subject to the other device when an abnormality occurs in the control subject device has been described, but the timing of switching is not limited to the occurrence of an abnormality, and may be maintenance or the like.

ＰＬＣ１及び指示調節計２は、ハードワイヤ接続してもよいし、通信（ＲＳ－４８５）を用いた信号の送受信を行うものであってもよい。 The PLC 1 and the indicating controller 2 may be hardwired or may transmit and receive signals using communications (RS-485).

上記実施形態では、制御対象機器５の制御を行う機器を、ＰＬＣ１及び指示調節計２の二重化回路としていたが、２台の指示調節計を用いたものとしてもよい。２台の指示調節計は、それぞれ制御演算を行い、算出した制御値を互いに送受信して同期をとる。制御対象機器５の制御を行う指示調節計の切り替えは、操作盤を用いてユーザが行ってもよいし、中央監視ＰＣを用いて自動で行ってもよい。 In the above-described embodiment, the equipment that controls the equipment to be controlled 5 is a duplexed circuit of the PLC 1 and the indicating controller 2, but two indicating controllers may be used. The two indicating controllers respectively perform control calculations and mutually transmit and receive the calculated control values for synchronization. The switching of the indicating controller that controls the controlled device 5 may be performed by the user using the operation panel, or may be performed automatically using the central monitoring PC.

センサを二重化してもよい。ＰＬＣ１及び指示調節計２は、それぞれ、第１センサ及び第２センサから測定値を取得し、第１センサからの測定値を用いて制御演算を行い、制御値を生成する。第１センサに異常が生じ、測定値が所定範囲外となった場合、ＰＬＣ１及び指示調節計２は、第２センサからの測定値を用いて制御演算を行い、制御値を生成する。 A sensor may be duplicated. The PLC 1 and the indicating controller 2 acquire measured values from the first sensor and the second sensor, respectively, perform control calculations using the measured values from the first sensor, and generate control values. When an abnormality occurs in the first sensor and the measured value falls outside the predetermined range, the PLC 1 and the indicating controller 2 perform control calculations using the measured value from the second sensor to generate a control value.

なお、本発明は上記実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化できる。また、上記実施形態に開示されている複数の構成要素の適宜な組み合わせにより、種々の発明を形成できる。例えば、実施形態に示される全構成要素から幾つかの構成要素を削除してもよい。さらに、異なる実施形態にわたる構成要素を適宜組み合わせてもよい。 It should be noted that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying constituent elements without departing from the scope of the present invention at the implementation stage. Further, various inventions can be formed by appropriate combinations of the plurality of constituent elements disclosed in the above embodiments. For example, some components may be omitted from all components shown in the embodiments. Furthermore, components across different embodiments may be combined as appropriate.

１ ＰＬＣ
２ 指示調節計
３ 切替器
４ センサ
５ 制御対象機器
1 PLC
2 indicator controller 3 switch 4 sensor 5 device to be controlled

Claims (5)

センサから測定値を取得し、該測定値と目標値とを比較し、比較結果に基づいて制御対象機器へ第１制御値を送信する指示調節計と、
前記指示調節計から前記第１制御値を取得し、前記センサから前記測定値を取得し、該測定値と前記目標値とを比較し、比較結果に基づいて第２制御値を生成するＰＬＣ（プログラマブルロジックコントローラ）と、
を備え、
前記ＰＬＣは、前記制御対象機器の制御主体が前記指示調節計の場合は、前記指示調節計が出力した前記第１制御値が前記制御対象機器に与えられるようにし、該指示調節計に異常が発生すると、該第１制御値と同じ値の制御値を出力して前記制御対象機器に与えることを特徴とする制御システム。 an indicating controller that obtains a measured value from a sensor, compares the measured value with a target value, and transmits a first control value to the device to be controlled based on the comparison result;
A PLC ( programmable logic controller) and
with
When the control subject of the controlled device is the indicating controller, the PLC provides the first control value output by the indicating controller to the controlled device, and the indicating controller detects an abnormality. A control system characterized by outputting a control value having the same value as the first control value and giving it to the device to be controlled when the first control value is generated. 前記ＰＬＣは、前記指示調節計に異常が発生して、前記第１制御値と同じ値の制御値を出力した後、前記第２制御値との差分が小さくなるように出力制御値を調整することを特徴とする請求項１に記載の制御システム。 The PLC adjusts the output control value so that the difference between the second control value and the second control value becomes smaller after outputting the same control value as the first control value due to the occurrence of an abnormality in the indicating controller. The control system according to claim 1, characterized in that: 前記ＰＬＣは、前記制御対象機器の制御主体が該ＰＬＣの場合は、前記第２制御値を前記制御対象機器に与えると共に、該第２制御値を前記指示調節計へ出力し、
前記指示調節計は、前記ＰＬＣに異常が発生すると、前記第２制御値と同じ値の制御値を出力して前記制御対象機器に与えることを特徴とする請求項１又は２に記載の制御システム。 When the PLC is the controlling subject of the controlled device, the PLC provides the second control value to the controlled device and outputs the second control value to the indicating controller;
3. The control system according to claim 1, wherein, when an abnormality occurs in the PLC, the indicating controller outputs a control value that is the same as the second control value and gives it to the device to be controlled. . 前記指示調節計は、前記ＰＬＣに異常が発生して、前記第２制御値と同じ値の制御値を出力した後、前記第１制御値との差分が小さくなるように出力制御値を調整することを特徴とする請求項３に記載の制御システム。 The indicating controller adjusts the output control value so that the difference from the first control value becomes smaller after outputting the same control value as the second control value due to the occurrence of an abnormality in the PLC. 4. The control system according to claim 3, characterized in that: 前記指示調節計及び前記ＰＬＣは、それぞれ、第１センサ及び第２センサから測定値を取得し、該第１センサからの測定値を用いて前記第１制御値及び前記第２制御値を生成し、該第１センサの測定値が所定範囲外となった場合、該第２センサからの測定値を用いて該第１制御値及び該第２制御値を生成することを特徴とする請求項１乃至４のいずれかに記載の制御システム。
The indicating controller and the PLC obtain measurements from a first sensor and a second sensor, respectively, and use the measurements from the first sensor to generate the first control value and the second control value. and generating the first control value and the second control value using the measurement value from the second sensor when the measurement value of the first sensor is out of the predetermined range. 5. A control system according to any one of 1 to 4.
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JPS56166501A (en) * 1980-05-27 1981-12-21 Yokogawa Hokushin Electric Corp Dual system of adjusting device
JPH04109303A (en) * 1990-08-30 1992-04-10 Toshiba Corp Adjustment controller
JP2009037377A (en) * 2007-08-01 2009-02-19 Koyo Electronics Ind Co Ltd Verification simulator for programmable controller with pid process control function and verification system using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5127672A (en) * 1974-08-30 1976-03-08 Yokogawa Electric Works Ltd PUROSESUSEIGYO SOCHI
JPS5379183A (en) * 1976-12-23 1978-07-13 Yokogawa Hokushin Electric Corp Control device
JPS56166501A (en) * 1980-05-27 1981-12-21 Yokogawa Hokushin Electric Corp Dual system of adjusting device
JPH04109303A (en) * 1990-08-30 1992-04-10 Toshiba Corp Adjustment controller
JP2009037377A (en) * 2007-08-01 2009-02-19 Koyo Electronics Ind Co Ltd Verification simulator for programmable controller with pid process control function and verification system using the same

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