Cascade Control: Improving Disturbance Rejection Through Advanced PID Control

There’s a common misconception in various corners of the process industries related to advanced
process control (APC). When the topic of APC is raised it’s not uncommon for practitioners to
immediately think of complex fuzzy logic and model predictive solutions. But a broader view of APC also includes advanced applications of the Proportional Integral Derivative (PID) controller. Chief among those APC solutions both used in industry and based on the PID is Cascade Control.

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REJECTED: Top 3 Misconceptions of Manual PID Controller Tuning

When the PID controller was first introduced manual tuning was the only game in town. As tuning
software entered the market it consistently failed to address common challenges associated with industrial control. Those lapses provided the rational for a generation of practitioners to continue tuning PID loops by manual methods. Recent innovations now make software the clear and superior
option. But benefitting from tuning software requires practitioners to move beyond those historical misconceptions.

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Process Control 101: Put Your Knowledge to the Test

Think You Know Something About Process Control? As a leader in process control solutions,
Control Station knows that effective control depends on sound knowledge and application of proven best-practices. And as common and essential as PID control is to today’s production
facilities, there is a clear knowledge gap. Take our simple quiz – the results might surprise you.

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Where Can I Get Control Station 3.7? What Happened to Control Station v3.7?

While not all things get better with time some things do actually improve as they age. Anyone over 40 might argue with that statement, and they might have every reason to do so from a personal and physical standpoint. Even so, just a casual glance around – whether in an academic or an industrial setting – offers signs of progress nearly everywhere. To be sure there’s been plenty of progress here at Control Station.

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The Benefits of Feed Forward Control

By nature most people are reactive when it comes to dealing with life’s big expenditures. Think of happy occasions such as graduations and weddings. Then consider more somber milestones like retirement. By most accounts the average worker is wholly unprepared to absorb the costs linked to these and other of life’s events. Even though the timing and amount of those costs can be forecasted, the typical approach to saving for the future isn’t up to the task. Face it: As a species we’re wired to be reactive!

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What is Feed Forward Control?

To no practitioner’s surprise, process control exists as a discipline because manufacturing is complex. It’s erratic and occasionally unpredictable. At many facilities it is highly hazardous. Variability – whether localized to a single process or reverberated throughout a plant – can transform production from a well-managed operation to a highly turbulent task. Variability is a key reason why manufacturing is difficult. So it’s no wonder that process engineers focus their efforts on controlling disturbances – those unplanned upsets which drive variability from one process to the next.

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