Yokogawa Electric Corporation

Kazushi Sakamoto

Yoshinori Kobayashi

Hiroaki Nakajima

Hiroyuki Takizawa

Satoshi Kitamura

Kuniharu Akabane

Hideharu Yajima

Kenji Habaguchi

Senji Watanabe

Kiyotaka Kozakai

Masafumi Kisa

Mitsuhiro Kurono

Ikutomo Watanabe

Takeshi Hongo

Atsushi Terayama

Yoshie Morita

Itsuki Handa

A control apparatus characterized by including: a storage unit that stores operation management information; an application executing unit that transmits a signal for turning off the power source of a field instrument; a resetting unit that, based on the signal, instructs to suspend the power supply from the input/output modules; and an activating unit that instructs to resume the power supply from the input/output modules, based on an elapse of preset time during which the power supply from the input/output modules should be suspended.

Control apparatus, control method, and program

An I/O module according to one embodiment of the present invention includes a receiver electrically connectable to a field device and configured to receive first information autonomously transmitted from the field device, a storage storing the first information received by the receiver, and a comparator configured to compare the first information stored in the storage and second information newly received by the receiver and to rewrite the first information stored in the storage with the second information newly received by the receiver when the first information stored in the storage is different from the second information newly received by the receiver.

I/O module and process control system

There is provided a distributed control system including a plurality of field controllers which are connected through a control network. Each of the field controllers includes: a control clock that defines a control timing of the field controller; and an adjustment unit that adjusts a control time of the control clock depending on a network time obtained through the control network.

Distributed control system

The field control system includes: a field device; a field controller which is connected to a control network and which executes a computation processing for controlling the field device according to a given control cycle while executing a data communication between the field controller and the field device, the field controller including a communication unit configured to execute the data communication with the field device, and a control computation unit configured to execute the computation processing independently from the communication unit; and an operation monitor which is connected to the control network and which operates and monitors the field device, the operation monitor including a network clock which provides a common network time to the control network. The control computation unit and the communication unit execute the computation processing and the data communication in synchronism with each other in accordance with a timer clock based on the network time.

Field control system

There is provided a duplexed field controller. The duplexed field controller includes: first and second control units between which a control authority is switchable; a first application clock that is updated based on a reference clock so as to define a timing of an application operation of the first control unit; a second application clock that is updated based on the reference clock so as to define a timing of an application operation of the second control unit; and an update control unit that bypasses the first update of the second application clock after switching of the control authority, if the first application clock is ahead of the second application clock when the control authority is switched from the first control unit to the second control unit.

Duplexed field controller

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Tokyo, Japan

Kazushi Sakamoto