Q: What is Profit®  Loop?
A: Profit Loop is Honeywell’s patented algorithm that represents a single input/single output (SISO) model predictive controller specifically designed with the operating simplicity and computational efficiency of a standard PID controller. Profit Loop provides tight, robust control—increasing process stability by up to 30 percent.

Q: What is the difference between Profit Loop and PID?
A: The major difference is that the Profit Loop model predictive control can anticipate future changes so that it knows exactly how much to move the process to meet desired control objectives. The process can be controlled based on where it is, where it has been, and where it is going. Therefore, Profit Loop controllers do not overcorrect the process like typical PID controllers. This behavior leads to improved control, increased robustness, and less oscillatory control. PID use may actually increase process variability, decrease production and product quality, and ultimately increase operating and maintenance costs.

Q: What does Profit Loop offer compared with PID?
A:It offers the following advantages:

• More powerful algorithm, but similar CPU requirement
• Greater tolerance to process dynamics changes
• Less sensitivity to measurement noise
• Simpler tuning: single handle (faster-slower)
• Options of range control and setpoint control
• Feedforward control and state estimator.

Q: How does Profit Loop handle process delays?
A: Profit Loop is an ideal solution for applications where long process delays are inherent in the process dynamics. With Profit Loop, these delays are explicitly handled in the model-based algorithm, resulting in better control performance.

Q: For what types of applications is Profit Loop suitable?
A: Profit Loop can be applied to a wide variety of problems across industries. Profit Loop is a model-based controller, Smith Predictor, gap controller, and optimizer—all in one. Use it to control discrete analyzers, tank levels (surge), long delay processes and more.