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1.0
F
OUNDATION
1.1
Description
F
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that serially interconnects devices in the field. A Fieldbus
system is similar to a Distributed Control System (DCS)
with two exceptions:
• Although a F
physical wiring as an existing 4–20 mA device, Fieldbus
devices are not connected point to point, but rather are
multidropped and wired in parallel on a single pair of wires
(referred to as a segment).
• F
OUNDATION
distribute control across a network. Fieldbus devices are
smart and actually maintain control over the system.
PC
Power
Conditioner
Terminator
Power Supply
Control Room
Typical Fieldbus Installation
Unlike 4–20 mA analog installations in which the two wires
carry a single variable (the varying 4–20 mA current), a dig-
ital communications scheme such as F
considers the two wires as a network. The network can carry
many process variables as well as other information. The
Enhanced Jupiter transmitter is a F
registered device that communicates with the H1
F
OUNDATION
kbits/sec. The H1 physical layer is an approved IEC 61158
standard.
An IEC61158 shielded twisted pair wire segment can be as
long as 6234 feet (1900 meters) without a repeater. Up to
4 repeaters per segment can be used to extend the distance.
The maximum number of devices allowed on a Fieldbus
segment is 32 although this depends on the current draw
of the devices on any given segment.
Fieldbus
™
fieldbus
is a digital communications system
™
fieldbus
OUNDATION
fieldbus
is a system that allows the user to
™
6234 feet (1900 meters) maximum
fieldbus
protocol operating at 31.25
™
46-649 Jupiter Magnetostrictive Transmitter - F
Overview
™
system can use the same
Terminator
fieldbus
OUNDATION
fieldbus
™
OUNDATION
fieldbus™
OUNDATION
™
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