DEBUNKING THE MYTHS
ASSEMBLY IN TWO WEEKS
|WHY USE A FIELDBUS?
PASSES 20 MILLION
OF HART AND PROFINET
NEWS: CHINA, POLAND, JAPAN, BRAZIL
|NEW PRODUCTS: HAZARDOUS
AREA SWITCHES; SERVER TO PROFIBUS DP
SLAVE; DTM FOR PROFIBUS DP-V1; EASY
BUS DIAGNOSIS; PROCESS PARAMETERIZATION;
FREQUENCY CONVERTERS HAVE PROFINET
DEBUNKING THE MYTHS
busy month, proving that misunderstandings still abound!
We found these points in an FF
newsletter that deserve deeper analysis.
Myth 1: FF has better diagnostics
Response 1: Both FF
and PROFIBUS provide two-way communications which enables
instrument manufacturers to develop advanced diagnostics.
Therefore it is up to the manufacturer. , Typically they
are same. If they are not the same, then it is the manufacture
who has decided not to include the feature - it is not
related to the communication system.
Myth 2: Because FF is a
publisher-subscriber it can alert the user to problems
unlike a Master-Slave protocol (e.g. like PROFIBUS).
Response 2: In a publisher-subscriber
protocol, you still need a 'traffic cop' to direct who
can talk when - in the case of FF it is the so-called
Active Link Scheduler. In PROFIBUS, the traffic cop is
the master. The real difference between master-slave and
publisher-subscriber is hidden in protocol design theory
and really does not affect the end user very much. As
far as alerts go, when a slave wants to alert a PROFIBUS
master it sets a bit in the return message in data exchange,
then the master knows to issue a 'diagnostic request'
during the next cycle. In a typical system, this would
take no more than 200ms - plenty fast enough for any end
Myth 3: PROFIBUS PA is
a master-slave system, but it has no formal user layer
like FOUNDATION Fieldbus, so host system control schemes
may not be equal in how the diagnostic information is
Response 3: In communication
theory, what belongs in the 'application layer' and what
belongs in the 'user layer' is open to interpretation.
PROFIBUS tends to lump everything into the application
layer, whereas FF puts it in the user layer. In reality
they are dealing with the same stuff. As far as diagnostic
information goes, as long as the master conforms to the
PROFIBUS profile specification, it will always handle
the diagnostics the same way. FF exhibits variations between
masters on how they handle communications and diagnostics,
which leads to each FF host having a 'preferred vendors'
list. PROFIBUS does not require a 'preferred vendors'
list and therefore its devices are always truly 'open'.
Elsewhere, Walt Boyes complains
in his blog
about fieldbus numbers: "Why don't you all want
to include HART in the numbers game?" he pleads.
" ... there are roughly 22 million installed HART
devices in process automation. This is a number that
absolutely dwarfs PROFIBUS PA and Foundation Fieldbus,
both of whom have roughly a half million ... "
Whoa, slow down Walt! No-one
questions the massive success of HART. PROFIBUS and
PROFINET can both easily
embrace HART devices - what more do you want by
way of recognition? But the fact is that HART depends
on good old-fashioned 4 - 20mA and connects but one
device per cable. It's not a bus, never has been and
never will be (although it had a digital multi-drop
spec in its early days that mysteriously disappeared!).
Fieldbuses typically connect 10 devices per cable (it
can be more) and can transmit far more data. That puts
HART in a different context. Yes, with wireless added,
it moves towards the networking world, but it reigns
supreme in its own marketplace otherwise.
Finally, Polly's fame is
spreading. We hear - on jungle drums of course - that
she will make a PROFIBUS PA (personal appearance) at
the PTO's General Assembly Meeting in
August. If you're a PTO member this is a meeting
NOT to miss. Register
Have you any PROFIBUS
or PROFINET myths to report. If so, let
Polly's pdf to read more PROFINET myths, especially
about SUE ... and learn the facts before you become a
TRAINING: The 2007 series of
FREE one-day training classes centering on PROFIBUS, PROFIBUS
in the process industry and PROFINET are now well under way.
Keep monitoring the Schedule
here to find a course near you. For updates please visit
page. All attendees receive a certificate for 5.5 PDH
(Professional Development Hours). Attendees of PROFIBUS and
PROFINET one-day training events participate in a raffle for
a free seat in a Certified Network Engineer class (=
$2,695 value). Certified Network Engineer status is
highly valued by employers and relevant 5-day courses are
held regularly in Johnson City - more
ASSEMBLY MEETING IN TWO WEEKS: Meet PROFIman, one of
the stars of the PTOís 13th Annual General Assembly Meeting
taking place on August 1st and 2nd. The GAM actually begins
on Tuesday evening, July 31, 2007, with a Welcome Reception.
Wednesday and Thursday will then be filled with presentations
and meetings to provide vendor and user members with updates,
news and networking possibilities. Visiting experts and magazine
editors will also attend. (STOP
PRESS: We also hear that Pretty
Polly, that famous myth-perpetrator featured above,
will be making an appearance!)
Immediately preceding the General
Assembly Meeting are two free training classes. The first
is a PROFINET IRT class on Monday afternoon July 30. All-day
Tuesday, the west coast PROFINET Developer Workshop will be
conducted. You donít have to be attending the General Assembly
Meeting to participate in these free classes. You can
register for the PROFINET Developer Workshop here.
The workshop is targeted at device manufacturers to assist
them in speedy development of PROFINET products.
USE A FIELDBUS?: We've just published an AUDIO White
Paper in MP3 on this topic. Find
it here. It's real simple to listen to, and it's a great
way to learn in a spare 5 minutes. Tell
us what you think. If there's positive feedback we'll find
some more topics to audio-ize in due course.
WEBINARS: PTO's webinar program
has proved highly successful so we've planned some more. Our
earlier webinars dealt mainly with Industrial Ethernet in
general, including Ethernet basics, and were a great way to
prepare for more detailed training. We just completed
our fourth webinar a PROFINET Overview. Comments ranged
from: The information provided was great and presented
in a very professional manner, to Considering
the breadth of the subject, the Webinar covered it well during
the short session. There were some good suggestions
for future topics; let us know if you have any yourself. Our
next webinar is timed for Aug 28, 2007 (2:00pm ET) and will
cover Industrial Wireless Networking. Keep in touch with upcoming
webinars here. Revisit earlier
DEVELOPER WORKSHOPS: Like to win an iPod? Two PROFINET
Developer Workshops, designed for device developers, development
managers and product marketers, are upcoming and there's an
iPod to be won at both. Workshops are the perfect opportunity
to meet major suppliers of PROFINET development tools in one
room. At each event, ARC Advisory Group first provides a market
overview. The PTO then gives an overview on PROFINET and the
PROFI Interface Center provides a high-level look at various
tools and applications. Our most recent workshop was in Detroit
in May and was rated as 'highly successful' by attendees; "It
was good info," was a typical comment, "and just the
right length," though one person wanted a lot more! Ah
well ...! Exhibitors included: Comtrol Corporation, Hilscher
North America, Inc., HMS Industrial Networks, Inc., IXXAT, Inc.,
Real Time Automation, Siemens Energy & Automation, and Softing
North America. These workshops are entirely free of cost or
obligation and we've learned that attendees actually need more
one-on-one opportunities with exhibitors, which we will fix
at forthcoming events. We'll also be raffling an iPod at every
workshop! Coffee, a light breakfast, lunch and a hosted bar
are provided. Workshops are scheduled for Scottsdale
(July 31), and Boston
in October. To register visit the relevant link or call 480-483-2456.
PASSES 20 MILLION: PROFIBUS, the worlds most
popular fieldbus, continues to grow! Not content with sales
of 3.4 million in 2006 alone (that's more then most of the
others have won in 15 years!), it passed the 20 million mark
in April this year to confirm its position as the most successful
fieldbus in history!
While PROFINET ramps up sales in the background PROFIBUS
sales show no sign of slowing down. It seems that end users
want to continue using well-proven PROFIBUS technology at
the same time as they deploy PROFINET Industrial Ethernet
solutions. Since PROFINET can integrate PROFIBUS easily, this
PROFIBUS is now the most successful fieldbus in history,
says PTO Executive Director Mike Bryant (pictured above).
It leads the world, while at the same time PROFINET
is delivering a compatible future. PROFINET was designed to
be tightly coupled with PROFIBUS and will fully support the
markets huge existing commitment to PROFIBUS. PROFINET
is also able to easily integrate other popular networks too,
including Interbus, FF, HART, DeviceNet and AS-Interface.
In short, existing systems can be retained when you use PROFINET!"
Profiles such as PROFIsafe and PROFIdrive operate consistently
on both platforms too, Mike pointed out, so moving between
them is simple. This synergy means legacy investments
in skills and equipment are fully protected. Frankly, we are
sure that PROFINET will rapidly follow the example of PROFIBUS,
to become the automation worlds most successful Industrial
AUTOMATION: Carl Henning's blog on behalf of the PTO
continues to create waves in automation. Recent blogs include
topics such as the OPC Foundation Devcon, where the latest
Unified Architecture developments were presented to a global
here if you want to tune in, or log in using web feeds
via IE7 (which makes things real easy for you). Not using
IE7? Then download one of the many specialist RSS readers
OF HART AND PROFINET: The international
Fieldbus Integration working group of PI has just
released the draft specification for the integration of HART
with PROFINET. Close collaboration with the HART Communication
Foundation (HCF) was evidenced by the active role a representative
of HCF Europe played in the working group. The integration of
HART into PROFINET is a natural development from the existing
HART on PROFIBUS profile and the communication services
already defined are retained. The main task lay in adapting
these to PROFINET communication objects. The integration of
HART into PROFINET supports HART Revision 6. As with PROFIBUS,
all HART commands can be transferred over the PROFINET system
with total transparency. This means that existing HART engineering
systems can now offer, via PROFINET, all the performance features
which have already been established for PROFIBUS, including
PROFIsafe GOES WIRELESS:
PROFIsafe has been specified for wireless networks! The new
version of the PROFIsafe profile (Version 2.4) describes the
conditions for the functionally safe transmission of data
via WLAN and Bluetooth. The concept has been approved by the
BGIA and TÜV. The publication of the specification of
PROFIsafe on PROFINET IO and thus on Ethernet - confirmed
the compatibility, in principle, of PROFIsafe for wireless
networks. It was then simply a case of defining the details
in respect of security. First applications are now being deployed.
PI members can download the profile for free from the PI website
must pay a fee of 150 euros.
ADVERTISING CAMPAIGN: PTO's
series of display advertisements for PROFINET has continued
with one focusing on the high Return on Investment (ROI) potential.
Total Life Cycle Costs (LCC) can be lowered dramatically says
the ad. which is themed on acronyms and headlined 'Greater
ROI or Eventual DOA: the Choice is Yours'. Click the image
to read the ad. Also, a special microsite has been set up
to support the ad. - read
that here. Previous ads covered the potential of PROFINET
for integrating other networks (We
Don't Eliminate the Competition, We Integrate Them), and
its powerful diagnostics capabilities (Turn
In March, 10 PROFIBUS engineers from seven Chinese companies
attended a Certified PROFIBUS Engineer Training course which
took place in Beijing. Demonstrating the level of international
cooperation that exists in the PI world, the training was
run jointly by PROCENTEC from the Netherlands and CAMETA (China
Association for Mechatronics Technology & Application).
Mr. Dennis van Booma, the manager of PROCENTEC, helped. The
China PROFIBUS Products Testing Laboratory (CPPTL) has upgraded
its testing level from PROFIBUS DPV0 to DP-V1 following an
audit by Dr. Patz, the Manager of PROFIBUS Products Testing
Working Group TC1. CPPTL will cooperate with the International
PROFIBUS Products Testing Working Group TC1 in the future.
INTEX - the Polish PICC (PI Competence Center) - organized
a one day workshop for manufacturers of automation equipment
on June 12th 2007 in Gliwice. JAPAN:
JPO, The Japanese PROFIBUS Organization, held seminars and
demonstration days called PROFIBUS Day 2007 in
June. This was also the 10th anniversary of JPO. BRAZIL:
During FIEE, the International Fair for Electric, Energy and
Automation Industry, in April in Brazil, the Latin America
RPA (Regional PI Association) organized another Case Study
Seminar to show successful applications of PROFIBUS.
AREA SWITCHES: BradCommunications
Direct-Link Industrial Ethernet switches now have Class 1,
Division 2 certification, making them 'UL approved' for use
in hazardous environments where volatile flammable liquids,
gases or vapors exist. All Direct-Link Industrial Ethernet
switches (the DRL-200 and DRL-300 series) and media converters
(DRL-100 series) are now being shipped with this certification.
Managed and unmanaged switches are available in 5-, 8- and
9-port configurations supporting both copper and fiber. Direct-Link
unmanaged switches provide a plug-and-play feature requiring
no configuration while the managed version comes with additional
tools for network management and diagnostics. Woodhead
TO PROFIBUS DP SLAVE: Create a powerful connection
between devices on an IEC60870-5-104 network and a PROFIBUS
master device using the ProLinx IEC60870-5-104 Server to PROFIBUS
DP Slave communications module. The module is a stand-alone
DIN-rail mounted protocol gateway that provides one Ethernet
port and one PROFIBUS DP Slave configurable DB9F port. The
104S module accepts commands from an attached master unit
on the network and generates messages. Prosoft
FOR PROFIBUS DP-V1: The
BradCommunications PROFIBUS DP-V1 CommDTM driver has successfully
passed FDT certification testing. CommDTM enables the SST
PROFIBUS USB interface (SST-PFB-USB-DTM) and the SST PROFIBUS
scanner for the Allen-Bradley ControlLogix (SST-PFB-CLX-DTM)
to configure and diagnose user-friendly DTM field devices
using FDT engineering tools like Fieldcare, PACTware or FieldMate.
Both products support PROFIBUS DP-V1 at all baud rates making
them ideally suited for use in PROFIBUS PA networks through
a PROFIBUS PA segment coupler. Other features include diagnostic
tools addresses assignment, logging of data and errors and
advanced PROFIBUS parameters for customized access to HART
BUS DIAGNOSIS: With the new BC-450-PB, both PROFIBUS
DP and PROFIBUS PA networks can be analyzed simultaneously.
This is made possible by two interfaces: RS485 for PROFIBUS
DP and MBP (Manchester-encoded and Bus Powered) for PROFIBUS
PA. Results are displayed in a single interface on a PC. Easy
comparison of the signals is possible. Even users without
detailed knowledge of the protocol can see at a glance whether
PROFIBUS is running smoothly or whether there are problems.
North America: +1 978 499 9650 or Ken.Hoover@softing.com.
PARAMETERIZATION: ProfibusView is a powerful engineering
tool for PROFIBUS PA field devices, for configuration, parameterization,
commissioning, operation, diagnostics and maintenance. A single
function block interface is involved and theres no need
for previous PROFIBUS skills. On-line monitoring of process
variables, alarms, status and diagnostics is also possible.
Features include: live list; data reconciliation; on-line
and off-line configuration; change address function; universal
reading and write commands. ProfibusView can be integrated
in System302 or be used stand alone. It also works with the
DF73 PROFIBUS DP-V1 master. Smar
CONVERTERS HAVE PROFINET: A PROFINET interface has
been added to the Sinamics G120 series of frequency converters.
This means Sinamics G120 converters can now be used in complex
automation architectures requiring real-time Ethernet. Power
ranges have been increased too, so the PROFINET link can be
available for complex systems including integrated communications
from the office to the field. Siemens
the home of PROFIBUS and PROFINET in North America