Voices: Feedback

Reader Feedback: Not Exactly PC-Based

PLCs and PACs Are More Robust and Include More Control Capabilities Than Those Offered Through PC-Based Control

By Dan Malyszko

I worked with Noosa Yoghurt to implement the process control solution discussed in the June article, "Process Automation, Controls Boost Production at Yogurt Plant ." While most of the details on the application are accurately described within the article, this particular application does not use PC-based control. Noosa uses a Rockwell Automation PlantPAx process control system built on a server and thin-client architecture. The actual control resides within a programmable automation controller (not a PC), despite how it's referenced in the article.

In my experience, PC-based control takes the control functions found on a programmable controller, encapsulates them in software and executes program tasks and I/O communications on the PC's processor along with other overhead related to the host operating system.

PLCs and PACs, on the other hand, are more robust and include more control capabilities than those offered through PC-based control. These could include motion control, integrated safety and advanced PID process control. At Noosa, the PAC-based PlantPAx platform provides the ability to add additional I/O, controllers and servers without adversely affecting the base characterized architecture of the system. This flexibility would not be possible within a PC-based system.

Dan Malyszko
Director of Operations, Malisko Engineering Inc.
dmalyszko@malisko.com

More from this voice

Title

Answer to Our Question of the Month

Would You Pay for Outside Help to Address Cybersecurity Issues?

11/03/2011

Basics of Analyzer Systems Busted!

You're Right. Here's the Correct Wording

11/03/2011

A Cybersecurity Wiki?

There Should Certainly Be a Wikipedia-Like Site for Security Professionals to Turn To for Proven, Tested Remedies and Suggestions

09/01/2011

Summer and Stuxnet

Talking Plant Cybersecurity in the Light of Stuxnet. With No Certifications for Control System Cybersecurity, Anyone Can Be an Expert. Who Does an End User Believe?

08/02/2011

Readers Respond to Cybersecurity and Temperature Measurement Compensation

Readers Agree With Our Cybersecurity Coverage and Ask Why the Methods of Compensation Were Not Addressed by Our Industry Experts

07/05/2011

Automation Apps, Gaming Systems and Thermodynamic Steam Quality

Readers Ask for Clarification on Some of Our Latest Articles

06/07/2011

Reader Feedback: Process Automation, Control Valves vs. VFDs and More

Readers Agree, Disagree and Respond to Some of Our Latest Articles. See What They Have to Say

05/02/2011

Fieldbus Errors; Tweet This, Not That

Factual Errors Connected With Profibus and Foundation Fieldbus and What the Tweet!!?

04/04/2011

Control Readers Speak Up

International Readers Lets Us Know About Automation Training Opportunities Abroad and One of Our Readers Challenges Our Contributing Editor, Bela Liptak

03/08/2011

Where to Go for Training

Process Automation Engineers Look for Online Training. Do You Know of Any Programs?

02/10/2011

Your Skills; Security Requirements for Vendors

Getting the Message Across. WIB's Security Requirements for Vendors is a Good Start

01/10/2011

Hoist by our own petard

Reader Feedback from the February issue says that when the game leaves town, people are left twiddling their thumbs, and that the passivity of engineers is the true enemy, not the Chinese.

02/15/2005