HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Blog

Fully Integrated Automation Lives in the PLC

NO RATINGS
View Comments: Newest First|Oldest First|Threaded View
<<  <  Page 2/2
William K.
User Rank
Platinum
Re: But are the functions really separate?
William K.   1/24/2014 3:00:46 PM
NO RATINGS
I know that they are saying that, but I have not heard any explanation of facts that would validate the claim. It is one thing to make an assertion and a somewhat different thing to be able to explain in detailwhy it is true. My feeling is that they have not covered all of the failure modes that I have seen. So if they would like to place a really detailed article in Design News about the actual mechanism of why their combined system is safer I would certainly be happy to read it.

Rob Spiegel
User Rank
Blogger
Re: But are the functions really separate?
Rob Spiegel   1/24/2014 10:21:35 AM
NO RATINGS
You're not alone with this skepticism, William K. Certainly for years it was unheard of to combine both functions on the same network. But the safety folks are saying these combined networks are safer than the old single-duty safety networks.

William K.
User Rank
Platinum
But are the functions really separate?
William K.   1/24/2014 9:46:45 AM
NO RATINGS
I keep seeing the claims that somehow safety functions and control functions all using the same processor can offer complete separation and 100% reliability. Of course there are a few hardware parts that are common to both of them and it is a challenge to imagine that if excessive enclosure temperature causes one part of the processor to lock up that the other part will continue to function as it should. And a power supply failure would probably shut the whole package down, as well. So while automation has become simpler and less expensive it does not make sense to go to those extremes of combining everything, even if it does reduce the initial prices.

<<  <  Page 2/2
Partner Zone
More Blogs
During a teardown of the iPad Air and Microsoft Surface Pro 3 at the Medical Design & Manufacturing Show in Schaumburg, Ill., an engineer showed this "inflammatory" video about the dangers of maliciously mishandling lithium-ion batteries.
It's been two years since the Mac Mini's last appearance on iFixit's teardown table, but a newly revised version joins Apple's lineup this week.
Science fiction author Isaac Asimov may have the best rules for effective brainstorming and creativity. His never-before-published essay, "On Creativity," recently made it to the Web pages of MIT Technology Review.
Much has been made over the potentially dangerous flammability of lithium-ion batteries after major companies like Boeing, Sony, and Tesla have grappled with well-publicized battery fires. Researchers at Stanford University may have come up with a solution to this problem with a smart sensor for lithium-ion batteries that provides a warning if the battery is about to overheat or catch fire.
In this new Design News feature, "How it Works," we’re starting off by examining the inner workings of the electronic cigarette. While e-cigarettes seemed like a gimmick just two or three years ago, they’re catching fire -- so to speak. Sales topped $1 billion last year and are set to hit $10 billion by 2017. Cigarette companies are fighting back by buying up e-cigarette manufacturers.
Design News Webinar Series
10/7/2014 8:00 a.m. California / 11:00 a.m. New York
9/25/2014 11:00 a.m. California / 2:00 p.m. New York
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Nov 3 - 7, Engineering Principles behind Advanced User Interface Technologies
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: 10/28-10/30 11:00 AM
Sponsored by Stratasys
Next Class: 10/28-10/30 2:00 PM
Sponsored by Gates Corporation
Next Class: 11/11-11/13 2:00 PM
Sponsored by Littelfuse
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service