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

Your Skills; Security Requirements for Vendors

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

01/10/2011

Wireless a Matter of Choice

End Users Get to Choose Which Protocol Meets Their Needs the Best

08/27/2012

Where to Go for Training

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

02/10/2011

When to Trust the Operators

Not Every Abnormal Situation Can Be Foreseen, so the Question Becomes Where Do You Draw the Line?

11/13/2013

What's Wrong with VFDs?

Why Is There Limited Adoption of VFDs in the Process Industry?

07/04/2012

What's the Best PID Execution Time?

We Still Should Remember the Nyquist Sampling Theorem

04/03/2012

What Happened to the E and T in STEM?

Schools Today Keep Emphasizing the S and the M, but Hardly Concentrate on Teaching Engineering and Technology Areas of Manufacturing, Construction, Communications and Transportation

04/03/2012

Twitter Time Well-Spent

Using Twitter to Listen and Discover New Things Is Time Well Spent

10/02/2012

Thoughts on Without Wires

Wireless Is Used Instead of Doing Nothing at All or Doing It Manually

01/30/2013

The Future of Manufacturing?

Here Is A Reader's Point of View on What Manufacturing in America Actually Would Look Like

03/05/2012

The Case Against Lambda Tuning

Understand the Framework of Using Internal Model-Based Control (IMC) to Come Up With PID Parameters

07/31/2012

Thanks for the Thought

Seeing Things in a Different Way. It Takes a Little More Than Just Turning On the Faucet to Get a Drink

06/05/2012

Technology: Keep the Print

Don't ever Kill the Magazine

08/27/2012

Taking on Industrial Control Security Issues

What's It Going to Take Before We Start Getting Real about Industrial Control Security Issues

04/03/2012

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

STEM: Competent People Reply

Lets Help Our STEM Students While They're Still Students

06/04/2012

Securing Control Systems in Cyberspace

One of Our Readers Says That Even the ISA99 Memeber Will Say It Is Hard to Quantify Security From Their Security Access Level (SAL) Work

10/02/2012

Safety First?

The Wind Power Industry Is Experiencing a Learning Curve in Safety and Accident Prevention

01/05/2012

Really? A Political Diatribe?

Reader Disagrees with Editor in Chief Walt Boyes's View on External Cyber Attacks Dangers and U.S. Cybersecurity Policies

02/06/2012

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