8/25/2011
Networker
Capitalism is a great positive force that could improve trade and increase economic benefit and mutual well-being of all: that is, until a few million bad apples begin to cut. Unfortunately too short-sighted and selfish business interests and their puppets legislative promise honest promises its customers and fellow citizens, but then they break for a one-sided personal gain and coat their crimes in another round of conservative financial policy. These are tumors, the invisible hand of Adam Smith should be able to clean themselves.
But combining the flypaper of false promises, advertising, spin and other trick-of-hand with a semi-conscious consumers, voters and other shellfish to purge these lesions to become resistant. Therefore, the old invisible hand can not seem to shake off the parasites, the patriotic singing her praises, and then do everything to undermine it. No wonder that vampires are so popular these days.
Of course, process control and automation sector is far from immune to this disease. Technical misinformation, dishonest marketing and products that do more to suppliers market shares, as a service to protect the customer “has his years of characteristics of the production. More than 10 years old, I thought it would be good to compare an article PLCs (SPS) and other devices to write head-to-head, if only to get a better idea of how this may have a particular application better than the other brand. What a rookie. Not only do I not have the technical means to do it, but I found it almost impossible to direct comparisons between the control and regulation technology components as a consequence of the small but significant and seemingly inexplicable differences in their specifications and operating parameters of research. Resources told the time to me that many of these differences redundant and seemed to exist only in order to avoid comparison with competing products. How beautiful.
And do not even get me started on the long struggle fieldbus and the subsequent eight-member non-standard IEC 61158 standard. It was as one would a bunch of clowns came through on a railway line argument for the Ethernet Express and mowed them down all. Of course some of the more nimble acrobats survived by jumping on a moving train with their versions of its Ethernet, they used to dilute, I mean, make Ethernet robust enough for the manufacturing sector since.
“I weep for you,” said the Walrus. “I am deeply sorry.” With sobs and tears he from which the biggest, sorted with his handkerchief to his eyes streaming. -Lewis Carroll, Through the Looking-Glass and what Alice found there, 1872. ”
One of the most unfortunate examples of this misleading and useless arguments that further development of the IEC 61131-3 standard for programming PLCs. Introduced in 1993 and revised in 2003, including the five sections of software rules for ladder logic diagrams, block diagram, structured text, sequential lessons and lists.
But for many programmers, developers and users believe it is another non-standard, since many of the rules are so general, and because it can be so many exceptions and proprietary software enhancements, that their original definitions and original promise of portability of software between the devices is open.
“I have already maintained by that I do not believe that a standard as much as a guide for the vendor product,” says Jeremy Pollard. Our many years of “Embedded Intelligence columnist in Control Design and staff, has detailed offer about the problems with 61131-3 and the benefits they can still use. You can read all about it on www.controldesign.com/articles/2008/107.html.
Unfortunately, reminds a lot about the development of standards 61131-3 and other efforts to undermine me about Captain Barbossa in Pirates of the Caribbean. When talking about the pirates’ code of brotherhood, “he rolled his eyes and says,” Well, they tend guidelines. ”
Refer from By Jim Montague
Posted in: Automation,PLC,PLC programming
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