EDS25-1A Datasheet, PDF (1/34 Pages) Fuji Electric – Optical Fieldbus System System Composition Devices

Optical Fieldbus System System Composition Devices
DATA SHEET
Fieldbus is used for digital transmission of the next generation, which takes over the conventional 4 to 20mA analog current
transmission. The optical fieldbus using optical fiber as a fieldbus signal transmission line, has features of optical transmission
such as noise-resistance and thunder-resistance, in additions to the features of fieldbus.
The optical fieldbus system is composed of field devices, such as a pressure transmitter, a differential pressure transmitter,
temperature transmitter, and optical star coupler for blanching optical signals, and a host control system.
Example of system configuration
(single system)
Fieldbus configuration tool
FOCUS system
(or another manufacture's system)
FOCUS
operator station
Control LAN (Ethernet)
Controller ICS-2000
Electrical fieldbus
Control room
Fieldbus connecting unit
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Field
Optical cable
(optical fieldbus)
Optical star
coupler
Wiring cable
(electrical fieldbus)
Optical fieldbus
Transmission
distance; max.
1.2km
Electrical fieldbus
Optical fieldbus devices
Devices of this data sheet
Electrical fieldbus devices
FEATURES
Common specifications for system
1. Noise-resistance, thunder-resistance
Optical signals are free from effects of external noise and
inductive thunder, providing highly reliable transmission.
The use of non-metallic cables eliminates the propagation
of inductive thunder, ensuring excellent thunder-proof
transmission.
2. Reliability with redundancy
Duplex host devices are available by using 2 optical cables
(between star coupler and control room) to improve the
system reliability.
3. Intrinsic safety explosion-proof
Built-in power (battery) devices can be designed for intrin-
sic safety explosion-proof (intrinsic safety barrier is not re-
quired).
Restriction of current flowing into the signal bus need not
be taken into account, so any number of devices can be
connected to one bus.
Regulations: Specifications of Fieldbus Foundation
Transmission speed:
31.25kbps
Transmission cycle (macro-cycle):
Standard; 1sec (400ms, min.)
Optical cable: Composite cord, non-metallic cable
Silica fiber... Core/cladding dia. 100/
140µm or PCF fiber ... Core/cladding dia.
200/230µm
Optical connector:
FC connector or ST connector
Transmission distance:
Silica; 1.2 km (at transmission loss of opti-
cal cable, 4dB/km)
PCF; 0.7km (at transmission loss of optical
cable, 6dB/km)
Ambient temperature:
Silica; -30 to +70˚C, PCF: -20 to +60˚C, as
noted in specifications for each devices
Number of units connected:
Up to 16 units including host and field de-
vices (for 1 unit of star coupler)
EDS25-1a
Date Nov. 24, 1999