cpp – Process technology for the chemical industry 01.2019

These pluggable modules offer segments a choice of simplex
or redundant power, providing an on-board indication
as well as data access via the Profinet link
All Profinet redundancy structures (S2, R1 & R2) are possible
using two bus couplers; the modular design results in
a very small footprint depending on the application
in IEC 61158, allowing customers to use
the same twisted-pair wiring as when
4…20 mA signals are transferred from the
field layer to the control level. Fieldbus
topology will ultimately enable up to
32 field devices to be powered using the
existing wiring of one 4…20 mA device
and 28 V DC (instead of 24 V DC) in a
15 W power trunk. Depending on the field
devices – from simple temperature to
complex flow or valve control – it will
then be possible to transmit far more data
between the controller and the field layer.
Owing to the additional digital data,
plants can quickly identify anomalies and
respond with predictive maintenance
methods to ensure maximum system uptime,
increased plant availability and improved
efficiency. Ultimately, all plant assets
can be used with optimum effectiveness
and profitability.
Profibus-PA has been deployed in plant
across the globe for the past 25 years. Over
eleven million Profibus-PA field devices are
now installed worldwide, yet a linking device
that converts Profibus-PA into Profibus-
DP has always been required to connect
them to a PLC (programmable logic controller)
or DCS (distributed control system).
Based on a regular office and consumer environment,
but without the ruggedness and
high temperature capability needed on the
factory floor or outdoors, industrial-grade
Ethernet only became possible with the invention
of Profinet, which in the last two
decades has become the global standard in
factory automation.
In 2015, standardisation efforts resulted in
the gradual elimination of the intermediate
Profibus-DP step, facilitating a direct connection
between Profinet and Profibus-PA (as
well as all field devices).
Proxy for eight Profibus-PA segments
At last year’s Achema exhibition, Phoenix
Contact provided a sneak preview of a
modular system that connects the existing
and installed world of Profibus-PA segments
directly to the Profinet protocol. Each Profibus-PA
segment receives power in either
simplex or redundant mode and outputs
14 W to a PA segment featuring a highpower
trunk and being just 35 mm wide. A
fully expanded proxy can be connected to a
maximum of eight Profibus-PA segments
and has a Profinet coupler with eight parallel
connections that convert to Profinet at
10/100 Ethernet speeds.
The Profinet coupler – only 45 mm wide –
can either have a simple S1 connection or
be connected to two Profinet controllers via
an S2 redundant mode. Furthermore, an R1
or R2 redundant system can be configured
using a second Profinet coupler.
To enable easier installation and commissioning
of the proxy, Phoenix Contact
engineers also developed a GSDML
composer that creates the GSD (general
station description) in XML file format; this
is needed by the Profinet controller to address
the Profibus-PA segments connected
to the proxy. The system can be modified
when needed, with resulting edits of the
GSDML file.
Profinet switches with gigabit option
Over the years, Phoenix Contact has developed
a comprehensive range of products for
the process industry including power
supplies, cyber security, overvoltage protection
and the well-known terminal blocks.
The company also offers numerous media
methods for Profibus-DP as well as other
process automation (PA) infrastructure
products such as modular and block field
couplers for installation in zones 1 and 2.
Only recently, Phoenix Contact launched a
series of Conformance Class B Profinet
switches with both 10/100 and gigabit options
in its new 2200 and 2300 series of
Ethernet switches. A plethora of products
with IECEx, Atex and North American Hazloc
certification are available in the extensive
portfolio.
In summary, the digitalisation of the process
industry is well under way and in the next
few years many more new and exciting announcements
will further underline Phoenix
Contact’s commitment to industry needs
regarding process automation.
www.cpp-net.com
Online search: cpp0119phoenixcontact
Hall 9, Booth F40
AUTHOR:
ARNOLD OFFNER
Strategic Marketing Manager
Process Infrastructure,
Phoenix Contact
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