Feedback loops control discrete, continuous processes
Arguably, the most basic tool of the control engineering profession is the feedback loop, shown below. It consists of five fundamental elements: This measure-decide-actuate sequence repeats as often as necessary until the desired process condition is achieved. For a continuous process, a feedback loop attempts to maintain a process variable (or manipulated variable) at a desired value known as ... Control Engineering
What is a smart sensor?
One of the biggest advances in automation has been the development and spread of smart sensors. But what exactly is a "smart" sensor? Experts from six sensor manufacturers define this term. A good working "smart sensor" definition comes from Tom Griffiths, product manager, Honeywell Industrial Measurement and Control. Control Engineering
Input/output systems
Today's I/O systems can add intelligence, broader communications, and flexibility across multiple logic platforms, central or distributed. I/O modules, installation, retrofits, and associated labor can account for half of an automation project's total cost. "Designers can now mix-and-match some I/O modules across PLC, DCS, and PC control vendor product lines," explains Connie Chick, business ma... Control Engineering