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

Buying the Logic of Safety

NO RATINGS
< Previous Page 2 / 3 Next >
View Comments: Newest First|Oldest First|Threaded View
<<  <  Page 2/2
TJ McDermott
User Rank
Blogger
Re: Future Pricing Trends
TJ McDermott   2/6/2012 9:05:48 AM
NO RATINGS
The purchase price is declining, and safety PLC options are even more attractive at installation because the long cable home runs get decreased.  Instead of having all safety device cables return to the central location where the safety relays reside, the devices can land locally at distributed Ethernet IO locations which communicate via regular Ethernet cable.  The Ethernet IO cable already must be pulled back to the central PLC; this gives a significant cost savings for cabling and installation time.

The drawback to SafetyPLC option is the complexity for post-acceptance troubleshooting.  The skill level required to maintain and troubleshoot such a system is much higher.  Trouble-shooting a system using regular safety relays can be much simpler.

apresher
User Rank
Blogger
Future Pricing Trends
apresher   2/6/2012 8:56:46 AM
NO RATINGS
Interesting piece, TJ.  With safety becoming more an integral part of the integrated architecture/product line-ups for many automation control vendors, it will be interesting to see how the pricing trends play out over the next few years. Would expect that the premium will be heading downward but it's impossible to know how fast.

TJ McDermott
User Rank
Blogger
Re: Hands-on engineering
TJ McDermott   2/6/2012 8:46:53 AM
NO RATINGS
Beth, I have to write a correction here.  I realize I neglected to SUBTRACT the cost of the standard PLC from my safety PLC figure (the safety PLC performs both the safety function and the regular PLC function in one unit and thus replaces the standard PLC).

This would adjust the total safety PLC cost down to around $7000.  The safety PLC decision becomes even more attractive for the next system.

Beth Stackpole
User Rank
Blogger
Hands-on engineering
Beth Stackpole   2/6/2012 7:15:13 AM
NO RATINGS
I love this real-world example of how one simple design decision and component change can have real impact on the cost of the BOM and the ultimate performance of the product. This is a classic example of what happens every day in design iteration. It really shines a spotlight on how a more holistic view and big-picture thinking can really have impact on design results not to mention, costs. Thanks for sharing, TJ.

<<  <  Page 2/2
Partner Zone
More Blogs from Guest Blogs
We Have FPGAs with On-chip MCUs, but How About MCUs with On-chip FPGAs?
Programmable logic has come a long way from the simple devices we started out with. Remember Programmable Array Logic, or PALs? But where will we be in the next five to 10 years?
As industrial applications increasingly use process control systems utilizing sensor feedbacks to monitor various operating parameters, energy sources and consumption are becoming major factors of a system.
By asking more in-depth questions and providing customers with richer design data, distribution salespeople can quickly build credibility and help customers to avoid potential problems when they specify high-performance plastics.
Recent enhancements in rechargeable and primary (non-rechargeable) battery technologies enable industrial devices to perform beyond the limitations of legacy consumer batteries.
Design News Webinar Series
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
12/10/2014 8:00 a.m. California / 11:00 a.m. New York
11/19/2014 11:00 a.m. California / 2:00 p.m. New York
11/6/2014 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.
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  67


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.
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