Proportional-Integral-Derivative (PID) control is the workhorse control algorithm for process manufacturers. When tuned properly, it seeks to move a loop’s process variable (PV) to the setpoint (SP) as quickly as possible without overshoot or instability. But, in some cases, even proper tuning is not enough. External factors such as equipment failures, mechanical performance, or incorrect […]
I wanted to share this question and answer on setpoint lead-lag, from the Mentoring Engineers discussion group in the Emerson Exchange 365 community. The question: …one of the options you recommend for eliminating overshoot at setpoint changes is using a setpoint lead-lag setup. I cannot visualize the concept in my mind. In a Two Degrees […]
We continue our series on Cloud I/O from Emerson’s Anand Iyer. Today’s post is a primer on intuitive control. When we have an I/O cloud or bubbles of IO information with very less binding of the IO and a more free choice (within certain boundaries), there is an increasing possibility of intuitive processing. Intuitive processing […]
I received an interesting story from Emerson’s James Beall about a process manufacturer with a process filled with many fermentors. They were being converted over from Provox control systems to DeltaV systems. pH control was a key part of the plant’s fermentation process. The first two fermentors were converted over but were now cycling. The […]
Emerson’s Anand Iyer continues his series on Cloud I/O with his vision for what the future might hold for process automation systems. Let us look at what effect the cloud IO concept would have on the distributed control system (DCS) as we know today: The IO cloud forms the central part of the control system […]
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