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57-649 Jupiter Magnetostrictive Transmitter - FOUNDATION fieldbus™

1.0 FOUNDATION fieldbus

™

Overview

1.1 Description

OUNDATION fieldbus

™

is a digital communications system

that serially interconnects devices in the field. A Fieldbus

system is similar to a Distributed Control System (DCS)

with two exceptions:

• Although a F

OUNDATION fieldbus

™

system can use the same

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 fieldbus

™

is a system that allows the user to

distribute control across a network. Fieldbus devices are

smart and actually maintain control over the system.

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

OUNDATION fieldbus

™

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

OUNDATION fieldbus

™

registered device that communicates with the H1

OUNDATION fieldbus

™

protocol operating at 31.25

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.

Control Room

Power Supply

Terminator

6234 feet (1900 meters) maximum

Terminator

Power

Conditioner

Typical Fieldbus Installation

1 2 3 4 5 6 7 8 9 ... 31 32

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