Despite the appearance of digital fieldbus technology in plants, well-proven HART technology still has a viable long-term role, notes Ed Ladd of the HART Communication Foundation. He adds that industry consultants predict that HART easily will be supported and remain a significant communications technology for the next 20+ years.
Author: Ed T. Ladd, Jr., HART Communication Foundation, Austin, Texas
The constant-speed approach to AC motors made a lot of sense when energy was cheap and drives technology was in its infancy. With their latest advances, adjustable speed drives can provide one of the best energy efficiency options for a plant.
Companies, already having outsourced a lot of back office functions such as information technology (IT) and human resources management, now are targeting more central business functions, such as accounting and even R&D.
This contribution from ControlGlobal.com compares mechanical, analog and digital recorders for data acquisition and concludes that local data logging can be the easiest way to satisfy regulatory requirements.