JP2007286798A - Process control device and process control method - Google Patents

Process control device and process control method Download PDF

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JP2007286798A
JP2007286798A JP2006111844A JP2006111844A JP2007286798A JP 2007286798 A JP2007286798 A JP 2007286798A JP 2006111844 A JP2006111844 A JP 2006111844A JP 2006111844 A JP2006111844 A JP 2006111844A JP 2007286798 A JP2007286798 A JP 2007286798A
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hmi
devices
mobile terminal
terminal type
control
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Hiroyuki Suzuki
洋之 鈴木
Atsushi Nishioka
淳 西岡
Yoshio Maruyama
良雄 丸山
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Hitachi Ltd
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Hitachi Ltd
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<P>PROBLEM TO BE SOLVED: To enable CRT operation in a field with a central control room by using a mobile terminal type HMI (human-machine interface) device. <P>SOLUTION: Communication between a MHI (human-machine interface) device 5 and the mobile terminal type MHI device 6 is made wireless by providing radio communication devices 7 thereon, respectively. In a configuration including a plurality of HMI devices 5, when data is transferred to the mobile terminal type MHI device 6, operation contention among the HMI devices 5 is determined, and the HMI device of high priority becomes a transfer master. When an operation request is transferred from the device 6, operation contention among the HMI devices 5 is determined, and the HMI device 5 of high priority becomes a transfer master to a control device 3. Accordingly, a field operation of an existing facility can be made to CRT operation by preventing the operation contention. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、プロセス制御装置及びプロセス制御方法に関する。   The present invention relates to a process control apparatus and a process control method.

従来のプロセス監視・制御装置は、特許文献１に記載されているように、プロセスのデータのサンプリング装置や制御演算を行うプロセス制御装置と計算機を伝送路で結合し、集中型の監視・制御盤でプロセス状態の監視やプロセス操作を行っている。中央制御室ではプラント全体の状態とともに、個々の装置の状態まで監視・制御ができるようになっている。   As described in Patent Document 1, a conventional process monitoring / control device is a centralized monitoring / control panel in which a process data sampling device and a process control device that performs control calculation and a computer are coupled via a transmission line. The process status is monitored and the process is being operated. In the central control room, it is possible to monitor and control the status of individual devices as well as the status of the entire plant.

また、特許文献２に記載されているように、システム内の装置間のネットワークが無線の構成となっているものもある。   In addition, as described in Patent Document 2, there is a wireless network configuration between devices in the system.

特開平０２−１５５３９７号公報Japanese Patent Laid-Open No. 02-155397 特開２００４−３０４９６号公報Japanese Patent Application Laid-Open No. 2004-30696

新たにプラントを建設するときは全ての装置を無線化することが可能であるが、既設のプラント監視・制御システムでは、監視・制御用のネットワークが有線の専用ネットワークで構成されている。   When a new plant is constructed, all the devices can be made wireless. However, in the existing plant monitoring / control system, the monitoring / control network is constituted by a wired dedicated network.

無線通信を利用して、プラントのプロセスデータを監視・制御する移動端末型ＨＭＩ装置を追加しようとすると、制御装置と有線ネットワークに接続されている複数のＨＭＩ装置と移動端末型ＨＭＩ装置間でネットワーク構成が多段となり、排他制御を行えなくなる問題があった。   When an attempt is made to add a mobile terminal type HMI device that monitors and controls plant process data using wireless communication, a network is formed between the control device and a plurality of HMI devices connected to the wired network and the mobile terminal type HMI device. There is a problem that the configuration becomes multistage and exclusive control cannot be performed.

本発明の目的は、上記従来技術の問題点を克服し、既設のプラント監視制御システムに移動型端末ＭＨＩ装置を追加しても排他制御が可能となる、柔軟かつ信頼性の向上できるプロセス制御装置及び方法を提供することにある。   The object of the present invention is to overcome the above-mentioned problems of the prior art and to enable exclusive control even when a mobile terminal MHI device is added to an existing plant monitoring and control system. And providing a method.

上記目的を解決するために、本発明は、制御装置と有線の制御用ネットワークを介してプロセスデータを表示する複数のＨＭＩ装置を備えるシステムで、前記ＨＭＩ装置と移動可能なＨＭＩ装置の間を無線通信により監視・制御データを送受信可能とする構成を特徴とする。   In order to solve the above object, the present invention provides a system including a control device and a plurality of HMI devices that display process data via a wired control network, and wirelessly communicates between the HMI device and a movable HMI device. It is characterized by a configuration that enables monitoring and control data to be transmitted and received by communication.

移動端末型ＨＭＩ装置にプロセスデータを表示させるために、ＨＭＩ装置から無線通信により移動端末型ＨＭＩ装置に無線通信する際は、ＨＭＩ装置が互いに他のＨＭＩ装置を監視し、正常に動作しているＨＭＩ装置の中から１台が移動端末型ＨＭＩ装置と通信するように排他制御し、データの不整合が発生しないようにする。   In order to display process data on a mobile terminal type HMI device, when the HMI device wirelessly communicates with the mobile terminal type HMI device by wireless communication, the HMI devices monitor each other and operate normally. Exclusive control is performed so that one of the HMI devices communicates with the mobile terminal type HMI device, so that data mismatch does not occur.

また、移動端末型ＨＭＩ装置でプラント機器を制御するために、移動端末型ＨＭＩ装置からＨＭＩ装置へ無線通信する際は、複数の移動端末型ＨＭＩ装置間やＨＭＩ装置間で同時操作を受け付けないようにする。このために、正常に動作しているＨＭＩ装置の中から１台が移動端末型ＨＭＩ装置と通信するように排他制御する。これにより、移動端末型ＨＭＩ装置でもプラント監視・制御が可能になる。   In order to control plant equipment with a mobile terminal type HMI device, when performing wireless communication from the mobile terminal type HMI device to the HMI device, simultaneous operation between a plurality of mobile terminal type HMI devices or between HMI devices should not be accepted. To. Therefore, exclusive control is performed so that one of the normally operating HMI devices communicates with the mobile terminal type HMI device. As a result, plant monitoring / control is possible even with a mobile terminal type HMI device.

本発明によれば、プラント制御システムの構成に柔軟性を持たせることができ、また、プラント制御システムにおける通信の信頼性を向上することができる。   According to the present invention, the configuration of the plant control system can be given flexibility, and the communication reliability in the plant control system can be improved.

以下、本発明の一実施形態について図面を用いて具体的に説明する。図１は一実施例によるプラント監視制御システムの構成図を示す。プラント設備現場に設置されている監視・制御対象である機器に設けているセンサやアクチュエータの一例で、プラント監視のための熱電対１やプラント制御のための弁・コントロールドライブ２と、これらの信号を入出力する制御装置３がハードワイヤで接続されている。制御装置３とプラント情報を表示するためのＨＭＩ装置５は伝送路４を介して接続されている。上記、１〜５までは、通常、既に建設されているプラント監視・制御システムには備えられた機器である。   Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 shows a configuration diagram of a plant monitoring control system according to an embodiment. Examples of sensors and actuators installed in equipment to be monitored and controlled installed at the plant facility site, such as thermocouple 1 for plant monitoring, valve / control drive 2 for plant control, and these signals Is connected by hard wires. A control device 3 and an HMI device 5 for displaying plant information are connected via a transmission line 4. The above-mentioned 1-5 are equipments usually provided in a plant monitoring / control system that has already been constructed.

ＨＭＩ装置５に無線通信のための通信機器７−５を接続する。また、持ち運び自由な移動端末型ＨＭＩ装置６は無線通信のための通信機器７−６を接続する。ＨＭＩ装置５と移動端末型ＨＭＩ装置６はそれぞれの通信機器７−５、７−６を介して無線通信ネットワーク８により伝送される。   A communication device 7-5 for wireless communication is connected to the HMI device 5. In addition, the mobile terminal type HMI device 6 that is portable is connected to a communication device 7-6 for wireless communication. The HMI device 5 and the mobile terminal type HMI device 6 are transmitted by the wireless communication network 8 via respective communication devices 7-5 and 7-6.

図２はプロセスデータを移動端末型ＨＭＩ装置６で表示するときのデータの流れを示す。プラント設備を監視するために設置されている熱電対などのセンサによって計測されたプロセスデータ１０１は制御装置３によって工学値変換され（１０２）、得られた工学値１０２を伝送データとし、常時あるいは定期的に送信される（１０３）。ＨＭＩ装置５でそれらのデータが受信され、監視に使用される（１０４）。   FIG. 2 shows a data flow when the process data is displayed on the mobile terminal type HMI device 6. The process data 101 measured by a sensor such as a thermocouple installed to monitor the plant equipment is converted into engineering values by the control device 3 (102), and the obtained engineering values 102 are used as transmission data, either constantly or periodically. (103). Those data are received by the HMI device 5 and used for monitoring (104).

また、移動端末型ＨＭＩ装置６に無線通信でデータ送信をするために、複数のＨＭＩ装置５では無線送信のマスタとなる優先順位を設定しておく。正常に動作しているＨＭＩ装置５は生存信号を伝送路４を通して送受信し、互いに他のＨＭＩ装置５の動作状態を取得する。正常に動作しているＨＭＩ装置５の中から優先順位の高い１台のみがデータ送信することとする（１０５）。本内容については後述の図４でも説明する。１台のマスタＨＭＩ装置５のみが通信を行うように制約することで、他のＨＭＩ装置５のＣＰＵ負荷低減と無線ネットワークの伝送負荷低減を図ることが可能になる。   Further, in order to transmit data to the mobile terminal type HMI device 6 by wireless communication, a plurality of HMI devices 5 are set with a priority order to become a wireless transmission master. The normally operating HMI devices 5 transmit and receive a survival signal through the transmission path 4 and acquire the operating states of the other HMI devices 5 from each other. It is assumed that only one of the HMI devices 5 operating normally has a high priority and transmits data (105). This content will also be described in FIG. By restricting only one master HMI device 5 to perform communication, it becomes possible to reduce the CPU load of other HMI devices 5 and the transmission load of the wireless network.

１台のマスタＨＭＩ装置５は接続された無線装置７−５を通じて１０３のデータ伝送と同じ、あるいは加工されたデータを送信する（１０６）。移動端末型ＨＭＩ装置６は接続された無線装置７−６を通じてそれらのデータを受信し、データは監視に使用される（１０７）。   One master HMI device 5 transmits the same or processed data as the data transmission 103 through the connected wireless device 7-5 (106). The mobile terminal type HMI device 6 receives the data through the connected wireless device 7-6, and the data is used for monitoring (107).

これにより、オペレータは制御対象のある現場においてプラント機器状態の監視が可能になる。また、ＨＭＩ装置５においては従来通りの監視が可能であり、仮に外部からの電波障害等で無線が使用できなくなった場合でも継続してプラントの監視が行うことができる。   As a result, the operator can monitor the state of the plant equipment at the site where the control is to be performed. Further, the HMI device 5 can perform conventional monitoring, and can continuously monitor the plant even if the radio becomes unusable due to external radio interference or the like.

図３は移動端末型ＨＭＩ装置６からプラント機器を操作するときのデータの流れを示す。ＨＭＩ装置５や移動端末型ＨＭＩ装置６によりプラント機器の状態を監視しながら、入力された操作要求１１１をデータ伝送する（１１２）。あるいは移動端末型ＨＭＩ装置６により制御対象機器の近傍などで機器を見ることができる運転員により機器を観察しながら、運転員に入力された操作要求１１１は無線装置７−６、７−５によりＨＭＩ装置５にデータ伝送する（１１２）。   FIG. 3 shows a data flow when operating the plant equipment from the mobile terminal type HMI device 6. While monitoring the state of the plant equipment by the HMI device 5 or the mobile terminal type HMI device 6, the input operation request 111 is transmitted as data (112). Alternatively, the operation request 111 input to the operator is received by the wireless devices 7-6 and 7-5 while observing the device by an operator who can see the device in the vicinity of the device to be controlled by the mobile terminal type HMI device 6. Data is transmitted to the HMI device 5 (112).

この際、無線通信の受信側になるＨＭＩ装置５は複数存在するが、移動端末型ＨＭＩ装置６からのデータを処理して伝送路４に送信される操作指令が重複することを防ぐため、操作指令データを伝送路４に送出するＨＭＩ装置５は１台とする必要がある。このため、複数のＨＭＩ装置５では無線送信のマスタとなる優先順位を設定しておく。正常に動作しているＨＭＩ装置５は生存信号を伝送路４を通して送受信し、互いに他のＨＭＩ装置５の動作状態を取得する。正常に動作しているＨＭＩ装置５の中から優先順位の高い１台のみがデータ受信し、データ処理した上で（１１３）、伝送路４に操作指令データを送出する（１１４）。本内容については図５でも説明する。   At this time, there are a plurality of HMI devices 5 on the wireless communication receiving side. However, in order to prevent duplication of operation commands transmitted to the transmission path 4 by processing data from the mobile terminal type HMI device 6, The number of HMI devices 5 that send command data to the transmission line 4 needs to be one. For this reason, a plurality of HMI devices 5 are set with a priority order to become a master for wireless transmission. The normally operating HMI devices 5 transmit and receive a survival signal through the transmission path 4 and acquire the operating states of the other HMI devices 5 from each other. Only one of the HMI devices 5 operating normally is receiving data, processing the data (113), and sending operation command data to the transmission line 4 (114). This content will also be described in FIG.

また、一つの操作対象機器に対して同時に移動端末型ＨＭＩ装置や他のＨＭＩ装置により操作されることを防止するため、操作指令のマスタＨＭＩ装置５で受信し、他の装置で操作要求中であるか否かを表すフラグによってチェックされる（１１５）。操作競合の判定の結果、操作可能であれば、操作指令のマスタＨＭＩ装置５により最終的に制御装置３へデータ伝送される（１１６）。   Also, in order to prevent a single operation target device from being simultaneously operated by a mobile terminal type HMI device or another HMI device, an operation command is received by the master HMI device 5 and an operation request is being made by another device. It is checked by a flag indicating whether or not there is (115). As a result of the determination of the operation conflict, if the operation is possible, the data is finally transmitted to the control device 3 by the master HMI device 5 of the operation command (116).

次に、制御装置３で演算することにより制御信号に変換されて（１１７）アクチュエータなどの操作端２に出力される（１１８）。このとき、無線通信のマスタのＨＭＩ装置５と操作指令のマスタＨＭＩ装置５は同一であっても良い。また、ＨＭＩ装置５においては従来通りの操作が可能であり、仮に外部からの電波等で無線が使用できなくなった場合でも継続してプラントの操作が行うことができる。   Next, it is converted into a control signal by calculation in the control device 3 (117) and output to the operation end 2 such as an actuator (118). At this time, the wireless communication master HMI device 5 and the operation command master HMI device 5 may be the same. In addition, the HMI device 5 can be operated in the conventional manner, and the plant can be operated continuously even when the radio cannot be used due to external radio waves or the like.

図４はＨＭＩ装置５から移動端末型ＨＭＩ装置６へ監視データを伝送する際の処理フローを示す。ＨＭＩ装置５が図示のように複数台設置されている時、それらの装置は同等の機能を持っていることが多い。つまり、移動端末型ＨＭＩ装置６との無線通信を行うことが可能な装置が複数存在することになる。すべてのＭＨＩ装置５が無線通信をすると監視データの不一致を生じるだけでなく伝送負荷を増加させるため、正常動作しているＨＭＩ装置５の間で無線送信する機能のマスタを遷移させる必要がある。そのために、正常動作しているＨＭＩ装置５は定周期で生存信号を送出し、他のＨＭＩ装置５からの生存信号を受信する。現時点の生存しているＨＭＩ装置５の中で優先度の最も高い装置がマスタとなる。マスタの装置が停止した場合は次に優先度の高いＨＭＩ装置５が処理を継続する。   FIG. 4 shows a processing flow when transmitting monitoring data from the HMI device 5 to the mobile terminal type HMI device 6. When a plurality of HMI devices 5 are installed as shown in the figure, these devices often have equivalent functions. That is, there are a plurality of devices capable of performing wireless communication with the mobile terminal type HMI device 6. When all the MHI devices 5 perform wireless communication, not only does the monitoring data not match, but also increases the transmission load, it is necessary to change the master of the function of wireless transmission between the normally operating HMI devices 5. For this purpose, the normally operating HMI device 5 transmits a survival signal at a fixed period and receives a survival signal from another HMI device 5. Among the HMI devices 5 that are currently alive, the device with the highest priority becomes the master. When the master device stops, the HMI device 5 with the next highest priority continues processing.

図５は移動端末型ＨＭＩ装置６で行った現場機器に対する操作をＨＭＩ装置５を通じて制御装置へ伝送するための処理フローを示す。ＨＭＩ装置５が複数台設置されている時、多くの場合、それらの装置は同じ操作対象機器に対して別々のＨＭＩ装置から同時に操作することを抑止するための排他処理を行っている。   FIG. 5 shows a processing flow for transmitting an operation on the field device performed by the mobile terminal type HMI device 6 to the control device through the HMI device 5. When a plurality of HMI devices 5 are installed, in many cases, these devices perform exclusive processing to prevent simultaneous operation from different HMI devices with respect to the same operation target device.

移動端末型ＨＭＩ装置６では直接制御装置とネットワークで接続されていないが、操作のための信号を送信したとき、その操作指令を受信したＨＭＩ装置５では、自身がその情報を伝送路４へ送信する権利を保有しているかを判定する。権利を保有しているか否かは図４の処理と同様にマスタ判定処理により決定される。権利を保有していない装置は伝送路４へデータを送出しない。   The mobile terminal type HMI device 6 is not directly connected to the control device via the network, but when the operation signal is transmitted, the HMI device 5 that has received the operation command transmits the information to the transmission line 4 itself. Determine if you have the right to do so. Whether the right is possessed or not is determined by the master determination process as in the process of FIG. A device that does not have the right does not send data to the transmission path 4.

上記のように、無線通信の可能な移動端末型ヒューマンインターフェース装置を追加することで、必要なときに運転員がプラント機器の近傍でプラント機器を直接観察しながらタイムロスなしに操作可能となる。これにより、ＣＲＴオペレーション操作の操作性を向上させることができる。また、中央操作室要員と現場パトロール要員の兼任が可能となるため、運転員を削減できる効果がある。また、プラント機器を観察している運転員が直接、制御要求の抑止操作が可能となるため、安全性能向上の効果もある。   As described above, by adding a mobile terminal type human interface device capable of wireless communication, an operator can operate without time loss while directly observing the plant equipment in the vicinity of the plant equipment when necessary. Thereby, the operability of the CRT operation can be improved. In addition, since the central operation room personnel and the on-site patrol personnel can be combined, there is an effect that the number of operators can be reduced. In addition, since the operator observing the plant equipment can directly control the control request, the safety performance can be improved.

本発明の一実施例である無線通信監視・制御システムの全体構成図。1 is an overall configuration diagram of a wireless communication monitoring / control system according to an embodiment of the present invention. 本発明の一実施例における監視用プロセスデータの流れを示す説明図。Explanatory drawing which shows the flow of the process data for monitoring in one Example of this invention. 本発明の一実施例における制御用データの流れを示す説明図。Explanatory drawing which shows the flow of the data for control in one Example of this invention. 本発明の一実施例における監視用プロセスデータ処理の説明図。Explanatory drawing of the process data for monitoring in one Example of this invention. 本発明の一実施例における制御用データ処理の説明図。Explanatory drawing of the data processing for control in one Example of this invention.

符号の説明Explanation of symbols

１…熱電対、２…弁・コントロールドライブ、３…制御装置、４…監視・制御用伝送路、５…ＨＭＩ（ヒューマンマシンインターフェース）装置、６…移動端末型ＨＭＩ装置装置、７…無線通信装置、８…無線通信路、１０１…計測データ、１０２…工学値データ、１０３…有線通信、１０４…プラント状態監視、１０５…伝送ＨＭＩ装置の選択、１０６…無線通信、１０７…プラント状態監視、１１１…ＣＲＴオペレーション操作、１１２…無線通信、１１３…伝送マスタによるデータ処理、１１４…有線通信、１１５…操作競合判定、１１６…有線通信、１１７…制御演算、１１８…機器動作。   DESCRIPTION OF SYMBOLS 1 ... Thermocouple, 2 ... Valve, control drive, 3 ... Control apparatus, 4 ... Monitoring / control transmission line, 5 ... HMI (human machine interface) apparatus, 6 ... Mobile terminal type HMI apparatus apparatus, 7 ... Wireless communication apparatus , 8 ... Wireless communication path, 101 ... Measurement data, 102 ... Engineering value data, 103 ... Wired communication, 104 ... Plant status monitoring, 105 ... Selection of transmission HMI device, 106 ... Wireless communication, 107 ... Plant status monitoring, 111 ... CRT operation operation, 112 ... wireless communication, 113 ... data processing by transmission master, 114 ... wired communication, 115 ... operation conflict determination, 116 ... wired communication, 117 ... control calculation, 118 ... device operation.

Claims (6)

センサが検出したプロセスデータを工学値に変換する制御装置と、プロセスデータを編集して画面表示する複数のヒューマンマシンインターフェース（以下、ＨＭＩと呼ぶ）装置を有線ＬＡＮで結ぶプロセス制御装置であって、
前記ＨＭＩ装置に設けた無線通信装置と複数の移動端末型ＨＭＩ装置を無線ＬＡＮで結び、複数の前記ＨＭＩ装置から選択された１つのＨＭＩ装置により、前記移動端末型ＨＭＩ装置にプロセスデータを伝送し、監視する構成としたことを特徴とするプロセス制御装置。 A process control device that connects a control device that converts process data detected by a sensor into an engineering value and a plurality of human machine interface (hereinafter referred to as HMI) devices that edit the process data and display it on a wired LAN.
A wireless communication device provided in the HMI device and a plurality of mobile terminal type HMI devices are connected by a wireless LAN, and process data is transmitted to the mobile terminal type HMI device by one HMI device selected from the plurality of HMI devices. A process control device characterized by having a configuration for monitoring. 請求項１において、前記ＨＭＩ装置の選択は、複数のＨＭＩ装置からその１つを優先する排他制御により決定したＨＭＩ装置により、複数の移動端末型ＨＭＩ装置と通信して画面表示することを特徴とするプロセス制御装置。   The selection of the HMI device according to claim 1, wherein the HMI device selected by the exclusive control that gives priority to one of the plurality of HMI devices communicates with the plurality of mobile terminal type HMI devices and displays the screen. Process control device. センサが検出したプロセスデータを受けて制御データを演算する制御装置と、プロセスデータを編集して画面表示する複数のＨＭＩ装置を有線ＬＡＮで結ぶプロセス制御装置であって、
前記ＨＭＩ装置に設けた無線通信装置と複数の移動端末型ＨＭＩ装置を無線ＬＡＮで結び、複数の前記ＨＭＩ装置から選択された１つのＨＭＩ装置に対し、前記移動端末型ＨＭＩ装置から制御要求を発行する構成としたことを特徴とするプロセス制御装置。 A process control device that connects a plurality of HMI devices that edit process data and display a screen on a wired LAN by receiving process data detected by a sensor and calculating control data;
A wireless communication device provided in the HMI device and a plurality of mobile terminal type HMI devices are connected by a wireless LAN, and a control request is issued from the mobile terminal type HMI device to one HMI device selected from the plurality of HMI devices. A process control device characterized in that it is configured to 請求項１−３のいずれかにおいて、前記ＨＭＩ装置の選択は、互いに有線ＬＡＮの排他制御を行うと共に、無線ＬＡＮの排他制御を行うことを特徴とするプロセス制御装置。   4. The process control device according to claim 1, wherein the selection of the HMI device performs exclusive control of a wired LAN and exclusive control of a wireless LAN. センサが検出したプロセスデータを工学値に変換する制御装置と、プロセスデータを編集し、画面表示する複数のヒューマンマシンインターフェース（以下、ＨＭＩと呼ぶ）装置を有線ＬＡＮで結ぶプロセス制御装置の制御方法であって、
前記ＨＭＩ装置に設けた無線通信装置と複数の移動端末型ＨＭＩ装置を無線ＬＡＮで結び、複数の前記ＨＭＩ装置から選択された最も優先順位の高いＨＭＩ装置により、前記移動端末型ＨＭＩ装置にプロセスデータを伝送し、監視することを特徴とするプロセス制御方法。 A control method of a process control device that connects a control device that converts process data detected by a sensor into an engineering value and a plurality of human machine interface (hereinafter referred to as HMI) devices that edit the process data and display it on a wired LAN. There,
A wireless communication device provided in the HMI device and a plurality of mobile terminal type HMI devices are connected by a wireless LAN, and process data is transmitted to the mobile terminal type HMI device by the HMI device having the highest priority selected from the plurality of HMI devices. A process control method characterized by transmitting and monitoring a process. センサが検出したプロセスデータを工学値に変換する制御装置と、プロセスデータを編集し、画面表示する複数のヒューマンマシンインターフェース（以下、ＨＭＩと呼ぶ）装置を有線ＬＡＮで結ぶプロセス制御装置の制御方法であって、
前記ＨＭＩ装置に設けた無線通信装置と複数の移動端末型ＨＭＩ装置を無線ＬＡＮで結び、複数の前記ＨＭＩ装置から選択された最も優先順位の高いＨＭＩ装置に対し、前記移動端末型ＨＭＩ装置から制御要求を発行することを特徴とするプロセス制御方法。 A control method of a process control device that connects a control device that converts process data detected by a sensor into an engineering value and a plurality of human machine interface (hereinafter referred to as HMI) devices that edit the process data and display it on a wired LAN. There,
A wireless communication device provided in the HMI device and a plurality of mobile terminal type HMI devices are connected by a wireless LAN, and the HMI device having the highest priority selected from the plurality of HMI devices is controlled from the mobile terminal type HMI device. A process control method characterized by issuing a request.
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