Distributed Safety Arrives

70 Pages·2011·22.54 MB·English

Distributed
Safety Arrives
Jtous at lpikreo cdeisstsr ipbluatnetd n ceoanr tyroolu, ,d misatryibbuet eyodu sra ofewtyn .is coming soon
IEC 61131-3 BY THE NUMBERS
MEDITATING ON DISTURBANCE DYNAMICS
WHAT WENT WRONG AT FUKUSHIMA
1
1
0 EXCLUSIVE TO THE WEB
2
Y NEWS FROM EUROPE AND THE REST
A
M OF THE WORLD
WALT BOYES GOES NUCLEAR
MOTOR AND DRIVES GRAB BAG
CT1105_01_CVR.indd 3 4/25/11 4:17 PM
CONTRL_IFC_0511_Control Design 4/25/11 9:42 AM Page 1
CONTRL_FRHP_0511_Control Design 4/12/11 9:10 AM Page 1
Where Do I Go forPressure, Strain and Force Products?
Where Do I Go forTemperature Products?
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1⁄16DIN Temperature, Process All Stainless Steel Transducers
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Rube Goldberg 2011 Machine Contest For Sales and Service, Call TOLL FREE Rube Goldberg 2011 Machine Contest
Hosted by Discovery Museum, Bridgeport, CT Hosted by Discovery Museum, Bridgeport, CT
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Cover Art: Based on an Original Norman Rockwell illustration
© The Curtis Publishing Company *PATENTED
Dilbert © United Feature Syndicate, Inc. © COPYRIGHT 2011 OMEGA ENGINEERING, INC. ALL RIGHTS RESERVED Dilbert © United Feature Syndicate, Inc. © COPYRIGHT 2011 OMEGA ENGINEERING, INC. ALL RIGHTS RESERVED
CT1105_full page ads.indd 2 4/26/11 11:10 AM
CONTRL_IFC_0511_Control Design 4/25/11 9:42 AM Page 1
CONTRL_FRHP_0511_Control Design 4/12/11 9:10 AM Page 1
Where Do I Go forPressure, Strain and Force Products?
Where Do I Go forTemperature Products?
omega.com,
omega.com,
of Course! of Course!
Your single source for process measurement and control products!
Your single source for process measurement and control products!
Pressure Transducers for Compressor Control
Ideal for Food, Dairy, Beverage and Biopharm Industries
High Accuracy Pressure Transducers
mini DIN Cable
Now with 0.05% Accuracy and 0.03%
style style SanitaryRTD Probes
Linearity Options
Standard Duty with Integral Cable
Twist-lock
PX409 Series
style
Starts at
$475 PRS-3-100-CB
$120
MADE IN
(cid:31) 316L SS Wetted USA
Surfaces 32 pin or
Better Finish
(cid:31) 4-Wire Pt100
MADE IN Now available Class A Element
with M12
Standard
Connector!
USA
Order Model
Visit (cid:31) -50 to 200°C (-58 to
PX459
omega.com/px409_series
© Damianpalus / Dreamstime.com 392°F) Temperature
Range
AMHliulg lhSt-timPaieenrdlfeioasr smC Saotnmecpeeal StTiirblaiicnliostydnucer misntyi lDeIN Twisstty-lleock MCWoiinmthipa Trteuhsrreos iuIognndh uL-Bosotarddiay Cl ell PPArapetpctleiicsrniao tfnioo rSn tsSrtaaitni cG aagned LDiynneaamric
TechnPoXlSo3tg0a$y19r7t Ss5e arties Csatybllee Mounting Holes LC$G5B2-55K SPSGktDag$ r 4Sot5esf r a1i et 0 s CIPF Paornro dUc seSesa snienits ary
MADE IN MADE IN 32 pin Finish
USA
Visit Visit
omega.com/px309 Visit omega.com/lcgb USA omega.com/sgd_linear1-axis Visit
omega.com/prs-3-100-cb
© Nadejda Degtyareva / Dreamstime.com
Advanced Digital Very High Accuracy Digital Miniature Universal Load
Force Gauges Pressure Gauge, Cells Standardand Metric
WirelessTransmitter The “All-in-One” High-Performance Molten Metal
DFG55 LC202/LCM202 Series Surface Thermocouple InfraredThermometer Ceramic Sheath
SSta$e9rr9tise5 sat SDStPa$e6Grr9ti4se50 sa9t Sta$5r6ts0 at SStaA$r81t0sX Lat *OS-D$2T789855WTM TherNmE$8oP7c-5ToXuple
MADE IN 5-Pack
MADE IN
FREE!
FREE! USA USA MADE IN
Visit Visit Visit Visit
HaHnadrbdobooku nadnd omega.com/dfg55 omega.com/dpg409 omega.com/lc202 USA HPORT OEFSF STH!E Vomiseitg a.com/sa1xl ooms-edgt8a8.c5o5mw/ Vomiseitg a.com/nep-tx
Encyclopedia
1⁄16DIN Temperature, Process All Stainless Steel Transducers
and Strain Meters and PID High-Performance Silicon
Controllers Technology
CNi16 Series PX309-100MV
Find thousands Visit omega.com Sta$2r2ts5 at $175 SPtaXr4ts3 9a t
of pressure, strain and to order your FREEcopy of
Submersible $579
force products in one place! DilbertTMCONTROLCATTMNew Horizons® Water Level
Visit omega.comto order your FREEcopy in Temperature, Pressure, Flow and Transmitters
of The OMEGA®Pressure, Strain and Force
Measurement Handbook and Encyclopedia More! Version No. 28 Featuring Visit Visit meter sold
105 DILBERT Cartoons! Visit omega.com/cni16_series omega.com/px309 omega.com/px437 separately
Shop Online at
For Sales and Service, Call TOLL FREE Omega Engineering is a Proud Sponsor of the Omega Engineering is a Proud Sponsor of the Shop Online at
Rube Goldberg 2011 Machine Contest For Sales and Service, Call TOLL FREE Rube Goldberg 2011 Machine Contest
Hosted by Discovery Museum, Bridgeport, CT Hosted by Discovery Museum, Bridgeport, CT
to be held on May 21, 2011 to be held on May 21, 2011
www.discoverymuseum.org/rubegoldberg2011 www.discoverymuseum.org/rubegoldberg2011
Cover Art: Based on an Original Norman Rockwell illustration
© The Curtis Publishing Company *PATENTED
Dilbert © United Feature Syndicate, Inc. © COPYRIGHT 2011 OMEGA ENGINEERING, INC. ALL RIGHTS RESERVED Dilbert © United Feature Syndicate, Inc. © COPYRIGHT 2011 OMEGA ENGINEERING, INC. ALL RIGHTS RESERVED
CT1105_full page ads.indd 3 4/26/11 11:10 AM
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May 2011 • Volume XXIV • Number 5
f e at u r e s
C o n t r o l S y S t e M S
45 / IeC 61131-3 by the numbers
The IEC 61131-3 standard for controllers; what it is, what
it is not, and its benefits. by Jeremy Pollard.
a D v a n C e D p r o C e S S
C o n t r o l
51 / Meditating on Disturbance
Dynamics
Managing control loops requires a deep understanding
of setpoint, load path and noise. by F. Greg Shinskey
Cover Story
W e B e X C L u s I V e s
30 / Distributed Safety arrives
The Nuclear Mess. by Walt Boyes Just like distributed control, distributed safety is soon com-
www.controlglobal.com/Nuclear_1105/html. ing to a process plant near you, maybe your own. by Dan
Hebert, PE.
Motor and Drives Grab Bag. by Jim Montague
www.controlglobal.com/MotorsDrives_1105.html
Process Control News from across the Atlantic. by Nick
Denbow
www.controlglobal.com/IAI
CONTROL (ISSN 1049-5541) is published monthly by PUTMAN Media COMPANY (also publishers of CONTROL DESIGN, CHEMICAL PROCESSING, FOOD PROCESSING, INDUSTRIAL NETwORkING,
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May/2011 www.controlglobal.com 5
CT1105_05_07_TOC.indd 5 4/25/11 4:18 PM
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CT1105_full page ads.indd 6 4/26/11 11:14 AM
May 2011 • Volume XXIV • Number 5
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CT1105_full page ads.indd 8 4/25/11 3:57 PM
EDITOR’S PAGE
A headline You Will never See
“Good Engineering Saves Millions of Lives After Earthquake, Tsunami” is a headline
you will never see in the mainstream press or even in much of the technical media. But it
should be trumpeted far and wide. That’s because it’s true. But why isn’t this being dis- Walt boyes
Editor in chiEf
cussed? You have to ask yourself why. [email protected]
In 1923, Japan suffered what has been called Almost certainly, the press can get away with
the Great Kant Quake—a triple blow with a this abysmal level of reporting because the sci-
typhoon, a large earthquake and a tsunami oc- entific literacy of the population is so low—and
curring simultaneously. More than 100,000 so is that of most reporters.
people died, and another 42,000 went missing, Even the NRC, the Japanese power com-
mostly from earthquake-caused fires in Tokyo pany TEPCO and the Nuclear Energy Insti-
and from the 10-meter-tall tsunami waves. One tute don’t attempt to put responsible perspec-
of the few buildings in Tokyo barely damaged tive into their reports. They will, for example,
by the quake was the Imperial Hotel, designed say that the levels of radioactive iodine are
by Frank Lloyd Wright to be earthquake-resis- “high,” but they don’t explain what that means,
tant according to the best standards of the time, nor do they explain why they then say, “There’s
and which remained in use until 1968. no immediate danger to the population.” Any-
So far, in the aftermath of the 2011 earth- body raised since Three Mile Island has had it
quake and tsunami, there are far fewer deaths drummed into their heads that the phrase “no
and much less destruction, even though the immediate danger” must mean its opposite.
magnitude of the quake appears to have been This is not an attempt to whitewash TEPCO
far greater. Again, you have to ask yourself why. or the Fukushima Daiichi plant staff and res-
And then there is the continuing drama of cue workers. They’ve clearly made some inter-
Fukushima Daiichi. Based on the news reports esting and possibly quite poor decisions since
at this writing, the reactors have variously sur- the tsunami and quake, and they have a history
vived, melted down, had partial meltdowns, ex- of falsifying reports that goes quite a way back.
ploded, produced clouds of radioactive smoke What the reporting since the earthquake
or are raging out of control. In other words, the shows is that the public conception of engineer-
media community has no blinkin’ idea what is ing and its value is nearly nonexistent. Other-
going on. Once more, you have to ask why. wise, all the engineering man-centuries that
Certainly, the media can turn to experts, but went into earthquake proofing Japan’s struc-
unfortunately, the progression of experts has tures, and all the engineering man-hours going
moved from the more knowledgeable to the into keeping Fukushima Daiichi from becom- The press can get
more sensational. Why is that? ing a real disaster instead of an imagined one
Part of the reason is sensationalism itself. A would be getting coverage on page one. away with abysmal
world-ending nuclear-meltdown crisis is much But none of the large media outlets are even
more exciting than a story about very dedicated trying to focus on the fact that the death toll reporting because
engineers and technicians risking their lives to from this quake and tsunami is going to be less
get the reactors cooled down, so they can be than half that of the 1923 quake, even with a the scientific
repaired. It is much more exciting to report on significantly higher population. Why? Because
a collapsed building than on the several nearby of engineering. Good engineering. literacy of the
that did not, and why they didn’t.
But you have to ask yourself why the news population is so
media think they can get away with this kind
of terrible, non-factual (sometimes clearly even low.
fictional) reporting.
May/2011 www.controlglobal.com 9
CT1105_09_Edit.indd 9 4/25/11 4:19 PM
Name
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LabVIEW Architect
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©2011 National Instruments. All rights reserved. LabVIEW, National Instruments, NI, and ni.com are trademarks of National Instruments.
Other product and company names listed are trademarks or trade names of their respective companies. 01197
Hector_107H.indd 1 4/6/11 3:11:59 PM
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