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FUJI ELECTRIC JOURNAL 1998 Vol.71-No.10
Trends of Fieldbus Systems and Fuji Electric's Activities for the Optical Fieldbus
Shigeo Kuroiwa
The feildbus is expected to be a common infrastructure for
next-generation plant control and information systems. Fuji Electric
has made a large contribution to the international standardization of
the optical fieldbus based on the experiences of its fiber-optic field
instrumentation system (FFI) and is now developing optical fieldbus
devices and systems in accordance with the international standard. This
paper describes recent trends of fieldbus systems and Fuji
Electric's activities for the optical fieldbus.
An Overview of the Optical Fieldbus
Takeo Matsudaira
The fieldbus in accordance with the international standard has come in
the stages of practical use, and Fuji Electric will soon start to sell
optical fieldbus systems. This paper describes an overview of the whole
optical fieldbus, such as Fuji Electric's activities, system
components, features, and the economical effects of optical fieldbus application.
Major Components of the Optical Fieldbus
Nobuhiko Tsuji, Noboru Kanzaki, Yutaka Yoshida
To put the optical fieldbus to practical use, low-loss optical star
couplers, elements incorporating an efficient light-emitting diode and a
photodiode, optical transceiver circuits, and large scale integrated
circuits for transmission control with low power consumption are
required. Fuji Electric developed these major components to positively
promote international standardization of the optical fieldbus and
popularization through product marketing. This paper describes the
technologies and features of these major components.
Field Devices in Optical Fieldbus Systems
Etsuro Ito, Yuji Imi, Takumi Gunji
Optical fieldbus systems include field devices, such as pressure/differential
pressure and temperature transmitters for analog input and
optical/pneumatic converter for analog output, mostly of an
independent, distributed construction using a built-in battery for power
supply. The pressure/differential pressure transmitters realize high
precision using the same detector as the electric transmitter FCX-A.
The optical/pneumatic converter equipped with an analog output function
block outputs pneumatic pressure converted from set input. Single-point
temperature transmitters and a multipoint temperature converter with the
maximum of eight inputs are provided for temperature measurement.
Distributed Control Systems with Optical Fiedlbus
Kisaburo Sasano, Toru Ito
This paper gives an outline of the FOCUS (Fuji Open Control Universal
System) which supports optical fieldbus systems. The FOCUS is an open
integrated control system using personal computers as operator stations.
It is applicable even to small plants and can flexibly structure a
fieldbus system that meets a plant scale and use. The FOCUS is
compatible with both optical and electrical fieldbuses as well as can
support the redundancy of controllers and optical fieldbus trunk lines,
so that it can provide highly reliable control systems.
Construction and Testing of Optical Fieldbus Systems
Yoshimi Watanabe
The optical fieldbus, which uses optical fibers as the transmission line
of fieldbus signals, makes the best use of the superior transmission
characteristics of optical signals, such as noise immunity and safety.
Fuji Electric has supply records over ten years and ample experiences in
optical transmission technology for field instrumentation. This paper
outlines the fieldbus construction from design, installation to testing
based on these experiences.
International Standardization of the Optical Fieldbus
Ken Kakizakai, Takashi Ikeda
This paper gives an outline of the fiber-optic physical layer profile
developed by Fieldbus Foundation. The specification of the optical
fieldbus was approved as IEC1158-2 Amendment-1 in November 1995. After
that, the optical fieldbus working group of Fieldbus Foundation promoted
specification development and formally distributed the fiber-optic
physical layer profile in May 1998.
Examples of Fiber-Optic Field Instrumentation Systems (1)
Application to LPG/Crude Oil Storage Terminals
Naomi Azuma
The fiber-optic field instrumentation system (FFI) satisfies the
requirements of petroleum product storage terminals that handle
dangerous articles in a wide area and is rated high by users, resulting
in many supply records. This paper describes examples of systems
supplied to LPG/crude oil storage terminals. These terminals wholly use
the FFI for field instruments and realize intrinsic safety using light
and rationality in construction and management.
Examples of Fiber-Optic Field Instrumentation Systems (2)
Application to Aviation Refueling Systems
Naoki Shobayashi
To meet increasing air traffic demands, international airports have been
improved. Large projects such as the expansion of New Tokyo
International Airport (the second passenger terminal building and
increase in the pipeline capacity) and the opening of Kansai
International Airport have been completed. Fuji Electric supplied
fiber-optic field instrumentation systems (FFI) for the instrumentation
and control systems of aviation refueling systems in these airports.
The field devices are required to have an explosionproof construction
and be not influenced by radio noise and lightning surge, and therefore,
the FFI is most suitable for these cases.
Examples of Fiber-Optic Field Instrumentation Systems (3)
Application to Oil Refineries
Kozo Ishida, Masuyuki Kobayashi
The fiber-optic field instrumentation system (FFI) attracts attention
because it can meet immunity to noise and lightning surge,
explosionproofness, and reduction in wiring. There are many examples
which make the best use of these features. This paper describes
examples of FFI applications to (1) oil tank yards and (2) oil refinery
off-site facilities.
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