Profibus Pa Overview; Description - Magnetrol Pulsar R86 Operating Manual

4
1.0 PROFIBUS P
1.1

Description

PROFIBUS PA
serially interconnects devices in the field. A fieldbus system
is similar to a Distributed Control System (DCS) with two
exceptions:
• PROFIBUS PA
distribute control across a network. Fieldbus devices are
smart and actually maintain control over the system.
PC
Power
Conditioner
Power Supply
Control Room
Typical PROFIBUS 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 PROFIBUS PA
siders the two wires as a network. The network can carry
many process variables as well as other information. The
Model R86PA transmitter is a PROFIBUS PA
device that communicates with the DPV1 protocol operat-
ing at 31.25 kbits/sec. The MBP 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 seg-
ment is 32 although this depends on the current draw
of the devices on any given segment.
Details regarding cable specifications, grounding, termination,
and other network information can be found in IEC 61158
or the technical guideline "PROFIBUS PA
Installation Guideline" at www.profibus.com.
58-645 Pulsar® Model R86 Non-Contact Radar Transmitter – PROFIBUS PA Output
™ Overview
is a digital communications system that
™
is a system that allows the user to
™
6234 feet (1900 meters) maximum
Terminator Terminator
con-
™
™ certified
User and
™