PID, APC

Figure 3: Here the block diagram from figure 2 has been rearranged into a more familiar configuration that is functionally identical to a traditional feedback controller (blue) equipped with a setpoint filter (green) and a feedforward path (red). Most commercial feedback controllers include setpoint filtering and feedforward as standard options, making this version of model-following control simpler than the original version, and much easier to implement. Source: Control Engineering
PID, APC August 30, 2019

The basics of model-following control

Two proportional-integral-derivative (PID) controllers can be better than one. Model-following control may be the best choice if it's important to get the process variable to the setpoint without hunting or overshoot.

By Control Engineering
Figure 2: Next-generation APC consists of many software modules working together to deliver improved plant performance. Courtesy: Yokogawa Corp.
PID, APC August 7, 2019

Advanced process control improves refinery, chemical plant operations

Next-generation advanced process control (APC) shatters processing barriers for process facilities.

By Hiroshi Wakasugi and Sanjay Venugopal
Figure 1: In OOIP, the control design is built from objects that match those in the physical plant or equipment design. Courtesy: Coherent Technologies Inc.
PID, APC August 4, 2019

Leveraging OOIP, Part 2: Abstraction, nesting and interfaces

Part 2: Plants and equipment are assembled from objects, and controls architecture should be too. Industrial programmers can realize the productivity of object-oriented programming (OOP) without the complexity by using object-oriented industrial programming (OOIP). See nine ways to determine if a development system supports OOIP.

By Gary L. Pratt, P.E.
PID, APC May 13, 2019

Top 5 Control Engineering articles May 6-12

Articles about multivariable control benefits, control network standards, human-robot interaction, data historians, and IIoT benefits for manufacturers were Control Engineering’s five most clicked articles from May 6-12. Miss something? You can catch up here.

By Chris Vavra
PID, APC November 12, 2018

Top 5 Control Engineering articles November 5-11

Articles about tuning tips, Engineers' Choice finalists, pharmaceutical manufacturers, machine metrics, and functional safety were Control Engineering’s five most clicked articles from November 5-11, 2018. Miss something? You can catch up here.

By Chris Vavra
PID, APC August 30, 2018

Pros and cons of autotuning—the big story

The historic challenges of single-loop tuning, the limited success of autotuning, and the modern difficulties of model-based control share the same root cause.

By Allan Kern, APC Performance LLC
PID, APC August 2, 2018

Pros and cons of autotuning control: Part 2

Proportional-integral-derivative (PID) controllers that can automatically select their own tuning parameters sound good, but face challenges.

By Control Engineering
PID, APC July 3, 2018

Ladder logic’s future role in automation

Nine considerations when selecting a programming language. Ladder logic is favored by manufacturers in discrete industries, but as technology and automation evolve, its usefulness compared to other IEC 61131-3 programming languages and PC programming depends on application complexity and other factors.

By Jon Breen, Breen Machine Automation Services
PID, APC June 1, 2018

Pros and cons of autotuning control: Part 1

Proportional-integral-derivative (PID) controllers that can automatically select their own tuning parameters sound good but face challenges.

By Control Engineering
PID, APC January 9, 2018

Eight examples of a properly working closed-loop quality system

Closed-loop quality systems should provide production, quality, traceability, and transparency throughout the production process.

By Valérie Goulévitch