Yokogawa Electric Corporation

Takeshi Hongo

Kuniharu Akabane

Kenji Habaguchi

Takeshi Nakajima

Masayuki Murakami

Masanobu Tsuchiya

Toshiyuki Emori

Toyoaki Yokoi

Koji Demachi

Hiromichi Ebashi

Hiroya Enomoto

Yoshinori Kobayashi

Hiroaki Nakajima

Hiroyuki Takizawa

Satoshi Kitamura

Hideharu Yajima

Kazushi Sakamoto

Senji Watanabe

Kiyotaka Kozakai

Masafumi Kisa

Mitsuhiro Kurono

Akinori Ishii

Sadatoshi Sogo

A process control system includes a PC that is to be connected to a redundant network. The PC comprises a virtualization unit, and a real-time communication unit configured to operate as a separate process independent of the virtualization unit.

Process control system

A redundant PC system includes a plurality of redundant PCs which is to be connected through a network. Each of the redundant PCs includes hardware on which an interface for connection to the network is mounted and a host OS configured to operate on the hardware. The host OS is provided with a virtualization unit, and a redundant unit and a real-time communication unit, the redundant unit and the real-time communication unit being configured to operate as separate processes independent of the virtualization unit. The redundant unit is configured to perform a control monitoring for making a PC redundant via a universal interface.

Redundant PC 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

A communication control system is provided that performs communications satisfying a request for industrial applications and a request for open protocol communications at the same time. To this end, in the invention, a high-priority communication section performing critical communications to provide real time property and reliability, and a low-priority communication section performing communications based on an open standard protocol coexist in a same communication station.

Communication control system

A communication control system is provided that satisfies the needs of industrial applications in terms of real time properties, scalability and flexibility. For this purpose, the invention causes a communication station performing communications in accordance with a standard protocol to perform multiplex communications based on time division of a communication band. Communication is performed by dividing a communication cycle into time slots, and assigning a set of communication stations and a type of a communication section to each of the time slots.

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Tokyo, Japan

Takeshi Hongo