New PROFIBUS cables now available in a stranded design for additional flexibility
as well as a continuously corrugated aluminum armor product for additional protection
in very harsh environments.

About PROFIBUS

PROFIBUS is one of the largest open industrial
fieldbusses in the world. As with most fieldbus
systems, PROFIBUS can reduce operating costs,
increase productivity, decrease time to market for
new products, and improve product quality. And
unlike standard 4-20mA controls, PROFIBUS can
support up to 32 devices per segment — up to
a total of 126 devices, depending on total
system current.

PROFIBUS Features

Using shielded twisted pair cable, the PROFIBUS
topologies utilized in the industrial environment
include the following configurations: line, tree
and star (and combinations of these topologies).
The network can support up to126 nodes by using
repeaters, but the number of repeaters is limited to
nine. Standard connections are made through use
of a 9-pin D-Subminiature connector. Transmission
speeds are selectable starting at 9.6kbs.
　

PROFIBUS has been developed on the International
Standards Organization OSI (Open Systems
Interconnect) seven-layer model. Access to the bus
is defined in the second layer of the OSI model,
allowing PROFIBUS the option of multiple masters
on a single twisted pair cable.
　

PROFIBUS Applications

The PROFIBUS protocol applies to all applications,
but it may be combined with industry-specific
application profiles and relevant transmission
technology to meet differing factory
floor requirements.
Application-specific profiles include the following:
• PROFIBUS DP — optimized for factory automation
• PROFIBUS PA — optimized for process automation
• PROFIsafe — PROFIBUS for safety-related systems
• PROFIdrive — PROFIBUS for motion control
　

Belden DataBus Cables for PROFIBUS

Belden has developed three DataBus cables for
PROFIBUS DP that are in accordance with the
PROFIBUS specifications. Product No. 3079A is a
150-ohm twinax (twisted pair) cable that matches
the impedance of the factory automation system,
allowing for maximum signal transmission. The
cable incorporates an overall Beldfoil® shield plus a
65% tinned copper braid for maximum shielding
effectiveness. It also carries a UL NEC Type PLTC
listing to achieve maximum installation versatility.
New 3079E is a stranded cable that provides
additional flexibility during installation and in
use. And 183079A is a continuously corrugated
aluminum armored product designed to withstand
very harsh environments.
　

Belden also offers Product No. 3076F, a cable made
to the ISA/SP-50 Type A fieldbus specifications
for PROFIBUS PA application. It is an 18 AWG
stranded, foil shielded, twisted pair cable with
an intrinsically safe, blue PVC jacket.
　

As always with Belden industrial cables, there are
special jacket compounds, coloring, and armoring
options to fit your exact application requirements.