JP2018147222A - Monitoring controller for plant apparatus - Google Patents

Monitoring controller for plant apparatus Download PDF

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JP2018147222A
JP2018147222A JP2017041678A JP2017041678A JP2018147222A JP 2018147222 A JP2018147222 A JP 2018147222A JP 2017041678 A JP2017041678 A JP 2017041678A JP 2017041678 A JP2017041678 A JP 2017041678A JP 2018147222 A JP2018147222 A JP 2018147222A
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雄紀 佐藤
Takenori Sato
雄紀 佐藤
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Mitsubishi Electric Corp
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PROBLEM TO BE SOLVED: To provide a monitoring controller for plant apparatuses that is adapted to back up each apparatus IO part by one standby-system IO part in the event that abnormality occurs in a plurality of apparatuses IO parts supervisory-controlling plant apparatuses.SOLUTION: An apparatus IO part 4 for inputting a polling signal of a main IO part 2 outputs response data obtained by calculating operation data for a first apparatus 6 to the main IO part 2. The main IO part 2, when determining the response data is normal, requests response data from an apparatus IO part 4A next in order and switches a corresponding apparatus IO part 4 into a standby-system IO part 3a in the case that the response data is determined to be abnormal or in the case that the apparatus IO part 4 detects abnormality by self-diagnosis, thereby supervisory-controlling the apparatus IO part 4 in which abnormality occurs by the standby-system IO part 3.SELECTED DRAWING: Figure 1

Description

この発明は、原子力発電等におけるプラント機器の監視制御装置に関するもので、特に監視制御装置の相互バックアップを行う冗長システムに係るものである。   The present invention relates to a monitoring control device for plant equipment in nuclear power generation or the like, and particularly relates to a redundant system that performs mutual backup of the monitoring control device.

従来、例えば原子力発電プラントにおいて、検出器および操作器などの情報からプラントの制御を行うディジタル式制御システムであって、ＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）カードおよびＩＯ（Ｉｎｐｕｔ Ｏｕｔｐｕｔ）マスタカードを含む演算部と、ＩＯマスタカードに接続された入出力部とを備えた制御装置を複数個配置したものにおいて、複数個の制御装置の入出力部の数だけＩＯマスタカードを演算部の各々に配置し、該演算部が各制御装置の入出力部の全てをアクセスする冗長機能を備えた技術が開示されている（例えば、特許文献１参照）。   2. Description of the Related Art Conventionally, in a nuclear power plant, for example, a digital control system that controls a plant from information such as detectors and operating devices, including a CPU (Central Processing Unit) card and an IO (Input Output) master card; , In which a plurality of control devices including input / output units connected to the IO master card are arranged, IO master cards are arranged in each of the arithmetic units by the number of input / output units of the plurality of control devices, A technique is disclosed in which a calculation unit has a redundant function for accessing all of the input / output units of each control device (see, for example, Patent Document 1).

特開２００３−５８４３４号公報JP 2003-58434 A

しかしながら、原子力発電プラントのより安定した運転制御方式の採用により、制御対象機器の増加傾向に伴い、上記特許文献１に開示された技術を適用しようとすると、入出力部の数に応じてＩＯマスタカードが配置された構成、つまり全ての制御装置を二重化する必要があるので、制御装置の大型化、複雑化およびコスト高となるという問題点がある。   However, with the adoption of a more stable operation control system for nuclear power plants, with the increasing trend of devices to be controlled, if the technique disclosed in Patent Document 1 is to be applied, an IO master according to the number of input / output units Since the configuration in which the cards are arranged, that is, all the control devices need to be duplicated, there is a problem that the control device becomes large, complicated, and expensive.

この発明は、上記のような課題を解決するためになされたものであって、各機器ＩＯ部を相互にバックアップ可能とする待機系ＩＯ部を備えた構成を採用することで冗長機器数を削減した小型化、低コスト化したプラント機器の監視制御装置を提供することを目的とする。   The present invention has been made to solve the above-described problems, and reduces the number of redundant devices by adopting a configuration including a standby IO unit that can back up each device IO unit mutually. It is an object of the present invention to provide a monitoring and control device for plant equipment that is reduced in size and cost.

この発明のプラント機器の監視制御装置は、プラント機器の監視制御装置であって、
中央監視制御部につながる主ＩＯ部には、待機系ＩＯ部と複数の機器ＩＯ部と、
前記複数の機器ＩＯ部に共通して接続された共通切替スイッチ部を介して複数のプラント機器が設けられ、前記複数の機器ＩＯ部はそれぞれに対応した前記プラント機器を監視制御し、
前記主ＩＯ部が出力するポーリングを、順番に実施するためのポーリング信号を入力する前記機器ＩＯ部は、前記プラント機器の運転データを演算した応答データを前記主ＩＯ部に出力し、
前記主ＩＯ部は、前記応答データが正常であると判定した場合、次の順番の機器ＩＯ部に応答データの提出を要求するとともに、前記応答データが異常であると判定した場合、または前記機器ＩＯ部の自己診断による異常発生信号を入力した場合に、切替信号を前記待機系ＩＯ部に出力して前記異常発生に該当する機器ＩＯ部を前記待機系ＩＯ部に切り替え、
前記待機系ＩＯ部によって、前記異常発生の前記機器ＩＯ部に対応する前記プラント機器を監視制御するものである。 The plant equipment monitoring control device of the present invention is a plant equipment monitoring control device,
The main IO unit connected to the central monitoring control unit includes a standby system IO unit and a plurality of device IO units,
A plurality of plant devices are provided via a common changeover switch unit commonly connected to the plurality of device IO units, and the plurality of device IO units monitor and control the corresponding plant devices,
The device IO unit that inputs a polling signal for sequentially performing polling output by the main IO unit outputs response data obtained by calculating operation data of the plant device to the main IO unit,
When the main IO unit determines that the response data is normal, the main IO unit requests the next order device IO unit to submit response data, and determines that the response data is abnormal, or the device When an abnormality occurrence signal due to self-diagnosis of the IO unit is input, a switching signal is output to the standby system IO unit to switch the device IO unit corresponding to the abnormality occurrence to the standby system IO unit,
The standby system IO section monitors and controls the plant equipment corresponding to the equipment IO section in which the abnormality has occurred.

この発明に係るプラント機器の監視制御装置は、上記のような構成を採用しているので、冗長機器数が削減された小型化かつ低コスト化した装置となり、かつメンテナンスも簡素化されるという効果がある。   Since the monitoring and control apparatus for plant equipment according to the present invention adopts the above-described configuration, the apparatus is reduced in size and cost with reduced number of redundant equipment, and the maintenance is simplified. There is.

実施の形態１のプラント機器の監視制御装置を示すブロック図である。1 is a block diagram illustrating a monitoring control device for plant equipment according to Embodiment 1. FIG. 実施の形態１の動作を示すフローチャート図である。FIG. 3 is a flowchart showing the operation of the first embodiment. 実施の形態１の動作を示すフローチャート図である。FIG. 3 is a flowchart showing the operation of the first embodiment.

実施の形態１．
以下、この発明の実施の形態１を図に基づいて説明する。図１は例えば原子力発電プラントにおけるプラント機器の監視制御装置１００を示すブロック図である。
図１において、中央監視制御部１には主ＩＯ部２が接続されているとともに、この主ＩＯ部２からバス配線５０を介して、１台の待機系ＩＯ部３と、複数台の機器ＩＯ部である第一機器ＩＯ部４、第二機器ＩＯ部４Ａ、第三機器ＩＯ部４Ｂ〜第Ｎ機器ＩＯ部４Ｎが接続されている。
また、上記待機系ＩＯ部３および第一機器ＩＯ部４〜第Ｎ機器ＩＯ部４Ｎが、共通して接続される共通切替スイッチ部５が設けられているとともに、この共通切替スイッチ部５を介してプラント機器に相当する第一機器６、第二機器７、第三機器８〜第Ｎ機器９が接続されている。 Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a monitoring control device 100 for plant equipment in a nuclear power plant, for example.
In FIG. 1, a main IO unit 2 is connected to the central monitoring control unit 1, and one standby system IO unit 3 and a plurality of device IOs are connected from the main IO unit 2 via a bus wiring 50. The first device IO unit 4, the second device IO unit 4A, and the third device IO unit 4B to the Nth device IO unit 4N are connected.
The standby system IO unit 3 and the first device IO unit 4 to the Nth device IO unit 4N are provided with a common switching switch unit 5 connected in common. The first device 6, the second device 7, and the third device 8 to the Nth device 9 corresponding to plant equipment are connected.

主ＩＯ部２には、ロジック・演算部２１、指令部２２、異常判定部２３、記憶部２４、切替部２５が設けられている。待機系ＩＯ部３には、演算部３１、異常検出部３２、第一機器６〜第Ｎ機器９との入出力部３３が設けられている。図１に示すように第一機器ＩＯ部４〜第Ｎ機器ＩＯ部４Ｎは同一の構成要素を備えており、その構成を複数の機器ＩＯ部を代表して第一機器ＩＯ部４で説明する。
第一機器ＩＯ部４は、演算部４１、異常検出部４２、入出力部４３が設けられているとともに、共通切替スイッチ部５を介して第一機器６の称呼名である例えば”センサ”に接続されている。尚、第二機器ＩＯ部４Ａは第二機器７の称呼名である例えば”スイッチ”に、第三機器ＩＯ部４Ｂは第三機器８の称呼名である例えばバルブに、第Ｎ機器ＩＯ部４Ｎは第Ｎ機器の称呼名である”Ｎ”に接続されている。 The main IO unit 2 includes a logic / calculation unit 21, a command unit 22, an abnormality determination unit 23, a storage unit 24, and a switching unit 25. The standby system IO unit 3 is provided with a calculation unit 31, an abnormality detection unit 32, and an input / output unit 33 for the first device 6 to the Nth device 9. As shown in FIG. 1, the first device IO unit 4 to the Nth device IO unit 4N include the same components, and the configuration thereof will be described with the first device IO unit 4 representing a plurality of device IO units. .
The first device IO unit 4 is provided with a calculation unit 41, an abnormality detection unit 42, and an input / output unit 43. It is connected. The second device IO unit 4A is, for example, a “switch” that is the name of the second device 7, the third device IO unit 4B is, for example, a valve that is the name of the third device 8, and the Nth device IO unit 4N. Is connected to “N” which is the name of the Nth device.

次に、監視制御装置１００の上記各構成部材が正常に動作時の状態を説明する。尚、以下の複数の機器ＩＯ部の動作は第一機器ＩＯ部４で代表して説明する。
主ＩＯ部２は、中央監視制御部１からの制御指令信号を入力する。ロジック・演算部２１は所定のロジックに基づき第一機器ＩＯ部４に上記指令を共通切替スイッチ部５を介して第一機器６に出力する。上記指令に基づく第一機器６の運転データは、第一機器ＩＯ部４で読み込まれ、演算部４１は演算（例えば、Ａ／Ｄ（Ａｎａｌｏｇ−ｔｏ−ｄｉｇｉｔａｌ）変換）した結果を主ＩＯ部２に出力する。主ＩＯ部２のロジック・演算部２１で必要な演算処理後のデータは、中央監視制御部１に送信後、表示される。 Next, the state at the time of the normal operation of each component of the monitoring control device 100 will be described. The following operations of the plurality of device IO units will be described by using the first device IO unit 4 as a representative.
The main IO unit 2 inputs a control command signal from the central monitoring control unit 1. The logic / arithmetic unit 21 outputs the command to the first device IO unit 4 via the common changeover switch unit 5 based on predetermined logic. The operation data of the first device 6 based on the above command is read by the first device IO unit 4, and the calculation unit 41 calculates the result (for example, A / D (Analog-to-digital) conversion). Output to. Data after the arithmetic processing required by the logic / arithmetic unit 21 of the main IO unit 2 is transmitted to the central monitoring control unit 1 and then displayed.

次に、主ＩＯ部２とそれにつながる複数の機器ＩＯ部との通信において、主ＩＯ部２から複数の機器ＩＯ部に対して、規則的にデータの送信要求を確認するいわゆるポーリング時の動作に関し、図２、図３に示すフローチャートに基づき説明する。ここでも複数の機器ＩＯ部４〜４Ｎを第一機器ＩＯ部４が代表してその動作説明を行うものであり、また、ＳＴとはステップの略である。尚、以下に説明する第一機器ＩＯ部４のＳＴ１２〜ＳＴ１９の処理は、引き続き順に第二機器ＩＯ部４Ａ〜第Ｎ機器ＩＯ部４Ｎにおいても同様に実行され、第Ｎ機器ＩＯ部４Ｎによる処理後は第一機器ＩＯ部４に戻り、繰り返し処理されるものである。
ＳＴ１１．主ＩＯ部２の記憶部２４に記憶されているポーリング順に従い、指令部２２は第一機器ＩＯ部４〜第Ｎ機器ＩＯ部４Ｎに、非同期のポーリング信号を出力する。
ＳＴ１２．ポーリング順番の１番目に該当する第一機器ＩＯ部４は、入出力部４３を介しポーリング信号を入力すると、以下のＳＴ１３、またはＳＴ１５の動作を行う。
ＳＴ１３．第一機器ＩＯ部４は接続された第一機器６の出力する運転データを入力し、演算部４１で演算、所定の応答データを作成して主ＩＯ部２に出力する。
ＳＴ１４．主ＩＯ部２の異常判定部２３はＳＴ１３で出力された応答データの健全性をチェックし、正常と判定した場合、上記ＳＴ１２に戻り、次のポーリング順序の２番目に該当する第二機器ＩＯ部４ＡがＳＴ１３の動作を行い、主ＩＯ部２は応答データの健全性のチェックを行い、正常と判定した場合は上記動作を記憶部２４に記憶されたポーリング順序に従って、第Ｎ機器ＩＯ部４Ｎに到るまで継続する。また、異常と判定した場合は、ＳＴ１６に進む。
ＳＴ１５．第一機器ＩＯ部４の異常検出部４２は、自己診断によって自装置系（第一機器ＩＯ部４〜共通切替スイッチ部５〜第一機器６）に異常発生を検出した場合、異常検出信号を主ＩＯ部２に出力する。
ＳＴ１６．上記ＳＴ１４での異常と判定された場合、または上記ＳＴ１５の異常検出信号を入力する主ＩＯ部２の異常判定部２３は、異常発生と判定する。
ＳＴ１７．ＳＴ１６の結果から主ＩＯ部２の切替部２５は、第一機器ＩＯ部４から待機系ＩＯ部３に切り替える切替信号を指令部２２を介し出力するとともに、前記主ＩＯ部２の記憶部２４に前記待機系ＩＯ部３に切り替わったことおよびプラント機器の故障等の履歴を含むプラント機器名を格納する。
ＳＴ１８．上記ＳＴ１７の切替信号を入力する待機系ＩＯ部３は、第一機器６の監視制御を行う。
ＳＴ１９．主ＩＯ部２はＳＴ１７による切替結果、および異常検出信号を、中央監視制御部１に出力するとともに、中央監視制御部１は、異常発生の表示を行うとともに、記憶部２４に切替結果が格納される。 Next, in communication between the main IO unit 2 and a plurality of device IO units connected thereto, the operation at the time of polling that regularly confirms a data transmission request from the main IO unit 2 to the plurality of device IO units. This will be described based on the flowcharts shown in FIGS. Here again, the first device IO unit 4 will explain the operation of the plurality of device IO units 4 to 4N, and ST is an abbreviation of a step. In addition, the process of ST12-ST19 of the 1st apparatus IO part 4 demonstrated below is performed similarly similarly in the 2nd apparatus IO part 4A-the Nth apparatus IO part 4N sequentially, and the process by the Nth apparatus IO part 4N Thereafter, the process returns to the first device IO unit 4 and is repeatedly processed.
ST11. In accordance with the polling order stored in the storage unit 24 of the main IO unit 2, the command unit 22 outputs an asynchronous polling signal to the first device IO unit 4 to the Nth device IO unit 4N.
ST12. When the first device IO unit 4 corresponding to the first in the polling order receives a polling signal via the input / output unit 43, the first device IO unit 4 performs the following operation of ST13 or ST15.
ST13. The first device IO unit 4 receives operation data output from the connected first device 6, calculates by the calculation unit 41, creates predetermined response data, and outputs it to the main IO unit 2.
ST14. The abnormality determination unit 23 of the main IO unit 2 checks the soundness of the response data output in ST13, and if it is determined to be normal, the process returns to ST12 and the second device IO unit corresponding to the second in the next polling order 4A performs the operation of ST13, and the main IO unit 2 checks the soundness of the response data. If it is determined to be normal, the above operation is performed to the Nth device IO unit 4N according to the polling order stored in the storage unit 24. Continue until it reaches. If it is determined that there is an abnormality, the process proceeds to ST16.
ST15. When the abnormality detection unit 42 of the first device IO unit 4 detects an abnormality in its own device system (first device IO unit 4 to common changeover switch unit 5 to first device 6) by self-diagnosis, an abnormality detection signal is output. Output to the main IO unit 2.
ST16. When it is determined in ST14 that an abnormality has occurred, or the abnormality determination unit 23 of the main IO unit 2 that receives the abnormality detection signal in ST15 determines that an abnormality has occurred.
ST17. From the result of ST16, the switching unit 25 of the main IO unit 2 outputs a switching signal for switching from the first device IO unit 4 to the standby system IO unit 3 via the command unit 22, and also to the storage unit 24 of the main IO unit 2 Stores a plant equipment name including a history of switching to the standby system IO unit 3 and failure of the plant equipment.
ST18. The standby IO unit 3 that inputs the switching signal of ST17 performs monitoring control of the first device 6.
ST19. The main IO unit 2 outputs the switching result in ST17 and the abnormality detection signal to the central monitoring control unit 1, and the central monitoring control unit 1 displays the occurrence of the abnormality and the switching result is stored in the storage unit 24. The

尚、上記ＳＴ１７において主ＩＯ部２の指令部２２は、切替信号を第一機器ＩＯ部４から待機系ＩＯ部３に切り替えるよう出力することを示したが、これに代替して、切替信号を共通切替スイッチ部５に出力して、異常発生した第一機器ＩＯ部４から待機系ＩＯ部３に切り替えてもよい。   In ST17, the command unit 22 of the main IO unit 2 indicates that the switching signal is output so as to switch from the first device IO unit 4 to the standby system IO unit 3, but instead, a switching signal is output. You may output to the common changeover switch part 5, and may switch from the 1st apparatus IO part 4 in which abnormality generate | occur | produced to the standby system IO part 3. FIG.

以上のように、この実施の形態１によるプラント機器の監視制御装置１００は、複数の機器ＩＯ部４〜４Ｎに共通切替スイッチ部５を介して接続される第一機器６〜第Ｎ機器９に対して、１台の待機系ＩＯ部３が設けられた、すなわち冗長機器数を１台とした構成を採用しているので、小型化され、低コスト化したプラント機器の監視制御装置１００となる。また、主ＩＯ部２の記憶部２４は待機系ＩＯ部３に切り替えられたことおよびプラント機器名を記憶するので、メンテナンス時等に中央監視制御部１にて確認することなく現場サイトに近い主ＩＯ部２にて切替の現象と機器名とを確認できるという効果もある。尚、この実施の形態１では共通切替スイッチ部５を図１に示すように一体的構成のものとしているか、この構造に限らず、数個に分割した共通切替スイッチ部５としてもよい。   As described above, the plant device monitoring control device 100 according to the first embodiment is connected to the first device 6 to the Nth device 9 connected to the plurality of device IO units 4 to 4N via the common changeover switch unit 5. On the other hand, since one standby system IO unit 3 is provided, that is, a configuration in which the number of redundant devices is one is adopted, the plant controller monitoring control device 100 is reduced in size and cost. . In addition, since the storage unit 24 of the main IO unit 2 stores the fact that it has been switched to the standby system IO unit 3 and the name of the plant equipment, the main monitoring unit 1 near the job site is not checked at the time of maintenance or the like. There is also an effect that the switching phenomenon and the device name can be confirmed in the IO unit 2. In the first embodiment, the common changeover switch unit 5 has an integral structure as shown in FIG. 1 or is not limited to this structure, and may be divided into several common changeover switch units 5.

尚、本発明は、その発明の範囲内において、実施の形態を適宜、変形、省略することが可能である。   In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

２ 主ＩＯ部、３ 待機系ＩＯ部、４ 第一機器ＩＯ部、４Ａ 第二機器ＩＯ部、
４Ｂ 第三機器ＩＯ部、４Ｎ 第Ｎ機器ＩＯ部、５ 共通切替スイッチ部、
６ 第一機器、７ 第二機器、８ 第三機器、９ 第Ｎ機器、２１ ロジック・演算部、２３ 異常判定部、２４ 記憶部、２５ 切替部、４１ 演算部、４２ 異常検出部、
１００ プラント機器の監視制御装置。 2 main IO unit, 3 standby system IO unit, 4 first device IO unit, 4A second device IO unit,
4B 3rd apparatus IO part, 4N N apparatus IO part, 5 common changeover switch part,
6 First device, 7 Second device, 8 Third device, 9 N device, 21 Logic / calculation unit, 23 Abnormality determination unit, 24 Storage unit, 25 Switching unit, 41 Calculation unit, 42 Abnormality detection unit,
100 Monitoring and control device for plant equipment.

Claims (4)

プラント機器の監視制御装置であって、
中央監視制御部につながる主ＩＯ部には、待機系ＩＯ部と複数の機器ＩＯ部と、
前記複数の機器ＩＯ部に共通して接続された共通切替スイッチ部を介して複数のプラント機器が設けられ、前記複数の機器ＩＯ部はそれぞれに対応した前記プラント機器を監視制御し、
前記主ＩＯ部が出力するポーリングを、順番に実施するためのポーリング信号を入力する前記機器ＩＯ部は、前記プラント機器の運転データを演算した応答データを前記主ＩＯ部に出力し、
前記主ＩＯ部は、前記応答データが正常であると判定した場合、次の順番の機器ＩＯ部に応答データの提出を要求するとともに、前記応答データが異常であると判定した場合、または前記機器ＩＯ部の自己診断による異常発生信号を入力した場合に、切替信号を前記待機系ＩＯ部に出力して前記異常発生に該当する機器ＩＯ部を前記待機系ＩＯ部に切り替え、
前記待機系ＩＯ部によって、前記異常発生の前記機器ＩＯ部に対応する前記プラント機器を監視制御するプラント機器の監視制御装置。 A monitoring control device for plant equipment,
The main IO unit connected to the central monitoring control unit includes a standby system IO unit and a plurality of device IO units,
A plurality of plant devices are provided via a common changeover switch unit commonly connected to the plurality of device IO units, and the plurality of device IO units monitor and control the corresponding plant devices,
The device IO unit that inputs a polling signal for sequentially performing polling output by the main IO unit outputs response data obtained by calculating operation data of the plant device to the main IO unit,
When the main IO unit determines that the response data is normal, the main IO unit requests the next order device IO unit to submit response data, and determines that the response data is abnormal, or the device When an abnormality occurrence signal due to self-diagnosis of the IO unit is input, a switching signal is output to the standby system IO unit to switch the device IO unit corresponding to the abnormality occurrence to the standby system IO unit,
A monitoring control device for plant equipment, wherein the standby system IO section monitors and controls the plant equipment corresponding to the equipment IO section in which the abnormality has occurred. 前記主ＩＯ部は、前記応答データが異常であると判定した場合、または前記機器ＩＯ部の自己診断による異常発生信号を入力した場合に、切替信号を前記共通切替スイッチ部に出力して、前記異常発生に該当する機器ＩＯ部を前記待機系ＩＯ部に切り替える請求項１に記載のプラント機器の監視制御装置。 When the main IO unit determines that the response data is abnormal or when an abnormality occurrence signal is input by self-diagnosis of the device IO unit, the main IO unit outputs a switching signal to the common changeover switch unit, The monitoring control apparatus of the plant equipment of Claim 1 which switches the apparatus IO part applicable to abnormality generation to the said stand-by system IO part. 前記ポーリング信号は非同期であるとともに、前記ポーリング実施の順番は、前記主ＩＯ部の記憶部に格納されている請求項１または請求項２に記載のプラント機器の監視制御装置。 The monitoring control apparatus for a plant device according to claim 1 or 2, wherein the polling signal is asynchronous and the polling order is stored in a storage unit of the main IO unit. 前記待機系ＩＯ部に切り替えられた後の、前記待機系ＩＯ部の監視制御する対応の前記プラント機器名は、前記主ＩＯ部の記憶部に格納される請求項１から請求項３のいずれか１項に記載のプラント機器の監視制御装置。 4. The name of the corresponding plant device that is monitored and controlled by the standby IO unit after being switched to the standby IO unit is stored in the storage unit of the main IO unit. 5. The monitoring control apparatus for plant equipment according to item 1.
JP2017041678A 2017-03-06 2017-03-06 Monitoring controller for plant apparatus Pending JP2018147222A (en)

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JP2021180958A (en) * 2019-03-27 2021-11-25 株式会社大一商会 Game machine

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JPS6011901A (en) * 1983-06-30 1985-01-22 Toshiba Corp Back-up device of decentralized controller
JP2013258564A (en) * 2012-06-13 2013-12-26 Mitsubishi Electric Corp Data polling method and digital instrumentation control system of nuclear power plant using that method

Patent Citations (2)

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JPS6011901A (en) * 1983-06-30 1985-01-22 Toshiba Corp Back-up device of decentralized controller
JP2013258564A (en) * 2012-06-13 2013-12-26 Mitsubishi Electric Corp Data polling method and digital instrumentation control system of nuclear power plant using that method

Cited By (1)

* Cited by examiner, † Cited by third party
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JP2021180958A (en) * 2019-03-27 2021-11-25 株式会社大一商会 Game machine

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