Hitachi, Ltd.

Yoshio Maruyama

Satoru Shimizu

Tooru Kimura

Takahiro Yamada

Masahiro Yoshida

Tohru Akatsu

Katsuhito Shimizu

Yoshiharu Hayashi

Yasushi Hayasaka

Hidekazu Fujimura

Masao Furukawa

Shoei Takahashi

Kazuyasu Asakura

Kazuhiko Miura

Yukiko Mori

Yukiko Mouri

Hideki Hanami

Yasuhiro Nakashima

Sunao Masunaga

A monitoring apparatus has: an abnormality detecting unit which can detect an abnormality of a self apparatus; a second communication unit for receiving state information through a second communication network; a plant information forming unit for forming plant information as information regarding the whole plant equipment based on a plurality of state information; a first communication unit for transmitting the plant information to a maintenance tool through a first communication network; and an abnormal-case control unit constructed in such a manner that when the abnormality detecting unit detects the abnormality, a substituting request is transmitted to the other control unit, when a response to the substituting request is affirmative, an operation of the self apparatus is stopped, and when the response to the substituting request is negative or when the response to the substituting request is not received, the state information is transferred to the maintenance tool.

Plant monitoring and control system and plant monitoring and control method

This invention includes a control device and a maintenance support device. The maintenance support device included in the plant monitor and control device selects temporary setting target logic element among logic elements contained in a control logic data, generates a temporary setting target logic element data, and generates a temporary setting logic element parameter data in accordance with a value of logic element parameter inputted by an operator. The control device memorizes the temporary setting target logic element data sent from the maintenance support device as the temporary setting target logic element data, and also the logic element parameter data before the temporary setting corresponding to the logic element designated by the temporary setting target logic element data among the logic element parameter data. Then, the control device renews the logic element parameter data located in the saving area with use of the temporary setting logic element parameter data sent from the maintenance support device.

Plant monitor and control device and a maintenance support method thereof

A control apparatus for a plant system has data input/output units for inputting measured data obtained from a plant and a control command for the plant, a data transmission unit for transmission of data between a control unit and a plant monitor unit which are coupled to each other through a network, and a stimulated data mass setting and cancelling unit for performing mass setting of data handled by the data input/output unit and/or data handled by the data transmission unit to simulated data managed in the form of a list table by means of a maintenance tool and performing mass cancelling of the stimulated data set in the list table.

Control apparatus for a system of monitoring and controlling a plant including simulated data mass setting and cancelling means

This invention provides a process control simulator configured to efficiently debug a plant control system. A computer stores simulated data generated by a model executing part to a time-series memory area. A programmable controller stops input from the input-device interface when there is a virtual input/output request received. A virtual input/output processor sets simulated data from a time-series memory area of the computer to a time-series memory area of the programmable controller. A program executing part sets simulated data from the time-series memory area to a memory area at the same resolution as an arithmetic operation period of program execution and executes the program. Control output as a result of the execution is fed back to the model executing part of the computer, and the computer calculates simulated data as process value at this timing, and stores the data to its time-series memory area.

Process control simulator and process control simulating method

An objective is to quickly provide appropriate maintenance services at low costs during routine inspection procedures and/or upon occurrence of abnormal events at thermal power plants or stations. In a thermal power plant maintenance system comprising a control devicefor control of operation conditions and process amounts of plant equipment and a maintenance tooloperatively linked to the control devicevia a networkfor performing maintenance of a controlling controlleras built in the control device, the system further comprises a remote maintenance devicethat executes similar functions to those offered by the maintenance toolfor bidirectionally transferring plant data along with data concerning the controlling controller's status via a communications linebetween the maintenance tooland the remote maintenance deviceto thereby provide maintenance services of the thermal power plant of interest.

Method for providing power plant maintenance services

A multiplexing control system has a common process input/output unit for distributing process signals from sensors for measuring the same state variable of a process to digital controllers. One process input/output unit for inputting/outputting a process signal between the multiplexing control system and plant is provided for each process signal. The process input/output unit for the process signal of high importance is triplexed. A process controller having an operating function is provided to each of the triplexed process input/output units. A process input/output unit for the process signal of intermediate importance is diplexed. A process input/output unit for the process signal of low importance is monoplexed. The process signals of the diplexed process input/output units and the monoplexed process input/output unit are controlled by a controller having a master right among the process controllers.

Multiplexing control system and multiplexing method therefor

Documents used for process control can be managed and maintained from a document server and a terminal. In order to update the documents quickly so that an operated process is always kept in the most preferable state of operation, the document server stores and manages production documents used for actually controlling and monitoring a control system plant, whereas the terminal system is used to refer and edit plant documents. The terminal can synchronize contents of the plant documents in the document server with those in the control system before storing the synchronized plant documents in the terminal.

System and method for document management and synchronization

Document management system and method

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Mito, Japan

Yoshio Maruyama