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Control Global features news and analysis of process control and automation technology to help managers and engineers maintain and optimize systems for today's process industries.
Understanding switch configurations - Control Global
Nov 25, 2019 · A: NO and NC are the fundamental blocks of understanding any logic, be it soft or hardware. Normal condition is defined as energized condition and when plant/equipment/machine is running in normal condition, logic is true. NC means normally-closed contact. NO means normally-open contact.
Top 50 Automation Companies of 2021: Green Muscles In
Nov. 8, 2022. The Top 50 global and North American automation suppliers fend off recession with sustainability and digitalization. Larry O'Brien, Chantal Polsonetti, Mike Guilfoyle. The automation marketplace proved its resilience again in 2021 and returned to pre-pandemic levels. Despite advances in project engineering that reduced cycle times ...
How valve failure modes interact with controller actions and …
Dec 9, 2021 · The controller action is selected for the total loop (Figure 1) to always have negative feedback (RA). Each RA (180° phase shift) in the loop causes a sign reversal, while each DA results in no phase shift. In terms of the total loop, this means that if both the valve and the process are DA (phase shift = 0) or if both are RA (phase shift -180 ...
Signal filtering: Why and how - Control Global
Jul 24, 2019 · Greg McMillan. Filtering is the modification of a measured or calculated signal—using an algorithm and/or logic—to remove undesirable aspects of the signal before it is used in a calculation or a controller. Examples in control are the feedback (or controlled) variable to a PID or APC controller, or the input to a feedforward controller.
Final Control Elements: Smarter, More Efficient
Oct 12, 2008 · The three pillars of loop control for process automation are the field transmitter that measures and reports the significant variable, the field controller that takes that signal and turns it into a control signal, and the final control element, most often a control valve.
Automatic tank gauging 101 - Control Global
Mar 15, 2021 · Automatic tank gauging 101. March 15, 2021. From measurement accuracy to lifecycle costs, the key considerations to keep top of mind. Keith Larson. The purpose of tank gauging is to measure the contents of tanks and vessels for inventory control and custody transfer. Most process plants have tanks that hold feedstock or finished products, and ...
Top 50 Automation Companies of 2020: Rising to recover
Oct 27, 2021 · Coming out of the COVID-19 recession. The worldwide and North American automation markets almost universally declined in 2020 due to COVID-19. By April 2020, more than 80% of flights were restricted, cargo capacity was down, airlines and rental car companies reduced their fleets, and West Texas Intermediate Crude hit less than $37 per barrel.
The benefits and challenges of cascade control
May 24, 2023 · The benefits and challenges of cascade control. May 24, 2023. Cascade control can be understood best by using values and units of process variables. R. Russell Rhinehart. There are several techniques that enhance PID, termed advanced regulatory control. These were developed in the 1930s-40s and include reset feedback to prevent windup, override ...
Opportunity, Upheaval Ahead in Technology-Driven Future
Nov 17, 2014 · Jim Montague is the Executive Editor at Control, Control Design and Industrial Networking magazines. Jim has spent the last 13 years as an editor and brings a wealth of automation and controls knowledge to the position. For the past eight years, Jim worked at Reed Business Information as News Editor for Control Engineering magazine.