Programmable Automation Controllers Find Their Niche…Everywhere! by Advantech

In the beginning there was the relay and the timer. And in the process industries, there was the hardwired controller. A generation ago, digital electronics made the hardwired relay and controller obsolete in favor of the PLC, the programmable logic controller. Made to be fully deterministic and have limited control functions,

06/11/2007


In the beginning there was the relay and the timer. And in the process industries, there was the hardwired controller. A generation ago, digital electronics made the hardwired relay and controller obsolete in favor of the PLC, the programmable logic controller. Made to be fully deterministic and have limited control functions, PLCs were able to sweep hardwiring into the dustbin because they were easy to program in the 'ladder' style of electrical wiring diagrams, and they were easily re-programmable so that they could accommodate changes on assembly lines and in batch processes.

But PLCs are limited. Ladder-logic programming cannot be used for complex mathematical formula, such as the basic PID algorithm found in every single loop controller in a process plant, for example. Then, along came the PC. Inexpensive computing power became ubiquitous and easily affordable. PCs were tried early on in industrial control, but early operating systems and hardware were not up to the stresses and standards of the industrial workplace.

Programmable Automation Controllers Find Their Niche…Everywhere! by Advantech (4 page pdf)





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
Each year, a panel of Control Engineering editors and industry expert judges select the System Integrator of the Year Award winners.
Control Engineering Leaders Under 40 identifies and gives recognition to young engineers who...
Learn more about methods used to ensure that the integration between the safety system and the process control...
Adding industrial toughness and reliability to Ethernet eGuide
Technological advances like multiple-in-multiple-out (MIMO) transmitting and receiving
Virtualization advice: 4 ways splitting servers can help manufacturing; Efficient motion controls; Fill the brain drain; Learn from the HART Plant of the Year
Two sides to process safety: Combining human and technical factors in your program; Preparing HMI graphics for migrations; Mechatronics and safety; Engineers' Choice Awards
Detecting security breaches: Forensic invenstigations depend on knowing your networks inside and out; Wireless workers; Opening robotic control; Product exclusive: Robust encoders
The Ask Control Engineering blog covers all aspects of automation, including motors, drives, sensors, motion control, machine control, and embedded systems.
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
News and comments from Control Engineering process industries editor, Peter Welander.
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
This is a blog from the trenches – written by engineers who are implementing and upgrading control systems every day across every industry.
Anthony Baker is a fictitious aggregation of experts from Callisto Integration, providing manufacturing consulting and systems integration.
Integrator Guide

Integrator Guide

Search the online Automation Integrator Guide
 

Create New Listing

Visit the System Integrators page to view past winners of Control Engineering's System Integrator of the Year Award and learn how to enter the competition. You will also find more information on system integrators and Control System Integrators Association.

Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.