HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comment
Digital_Angel_316@yahoo.com
User Rank
Iron
Re: Part IV: Applications of PLCs & PACs
Digital_Angel_316@yahoo.com   4/1/2012 6:59:35 PM
NO RATINGS
The P.I.D. algorithm question's answer should note that PID filers are or should be made to be 'tunable'.  It comes back to the issues of accuracy and precision (how close to the exact set point do you need to get and stay without oscillation for example).  The startup problem like also 'special cases' is usually also addressed in all PID algorithms.  Choosing a 'P' - proportional setting such as 50% which is halfway between the starting point (first measurement) and desired point (temperature, fill position etc.) implements a sort of 'binary search' to move closer to the set point.  In seeking the set point, now the parameters for 'I' Integral which is a sort of running average, and 'D' Derivative which is the slope or rate of change can be determined.  In addition, prior knowledge of the controllers and sensors and other elements in the control system help to determine values for PID set points.  There are many good tutorials on PID and PID tuning online - enjoy!



Partner Zone
Latest Analysis
On Memorial Day, Americans remember the sacrifices the US armed forces have made, and continue to make, in service to the country. All of us should also consider the developments in technological capabilities and equipment over the years that contribute to the success of our military operations.
Imagine if you could train it from San Francisco to New York faster than flying?
In order to keep in line with safety protocols, industrial networks need to be filtered in a semantic way so that only information related to diagnostics is flowing back to the vendor and that any communications that could be used for remote machine operations are suppressed.
Siemens PLM has launched an online store to help customers search for, compare, and purchase partner-developed apps for its Solid Edge software.
Advanced visualization can depict an entire plant in motion, while also detailing an individual workstation. Individual products can be rendered different for each discipline involved — marketing, engineering, or suppliers.
More:Blogs|News
Design News Webinar Series
5/21/2015 11:00 a.m. California / 2:00 p.m. New York
5/7/2015 11:00 a.m. California / 2:00 p.m. New York
3/31/2015 11:00 a.m. California / 2:00 p.m. New York
6/11/2015 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.
Jun 8 - 12, Everything You Ever Wanted to Know about Filters
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


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 Course June 2nd-4th:
Sponsored by Proto Labs
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service