Tool2Tune vs PIDTune

Fine-tune your PID controllers and master your industrial processes. A powerful simulator allows you to model your processes and visualize the impact of changes to your PID controller on the performance of your control loop. Compare the results with you real data. Identify processes that could benefit from control optimization. Features: • graphical touch interface • visual and interactive parameter feedback • define both stable and integrating processes • several controller schemes • organize your collections of processes and PID settings • advanced modeling (noise, filter, units) • universal application for iPhone and iPad This LITE version allows you to discover the software. This version is also appropriate for students and non-professional users. Additional features of the PRO version of Tool2Tune-PID include: • import and visualization of real process data (CSV) More information is available at www.T2T-PID.com. We welcome your questions and suggestions at feedback@t2t-pid.com T2T-PID was developed in collaboration with SPC Consultants, experts with more than 20 years' experience in automation and system integration. This is a simulator. Its purpose is to allow you to appreciate the effect of different settings on the behavior of industrial processes.

PID Tuner uses the IMC (Internal Model Control) method to calculate PID tuning parameters. I’ve tried a lot of tuning methods over the years and have found this one to be the best. The app is written for the iPad to show all the information on one page. The program calculates: PID Parameters: Controller Gain (Kc) Integral Time (Ti) Derivative Time (Td) For process types First Order with Dead Time (FO) Second Order with Dead Time (SO) Integrating or Long Time Constant with Dead Time (I) For controller types Parallel (non-interacting) c(s) = Kc (1 + 1/(Ti s) + Td s) Series (interacting) c(s) = Kc (Ti s + 1)/(Ti s)(Td s + 1) For controller modes PID PI You can either enter the process gain (Kp) directly or enter the changes in the controlled virable (CV) and manipulated variable (MV). Tuning aggression is adjusted using the slider to set the closed loop time constant to the process time constant ratio (λ/Ƭ). The closed loop time constant (λ) is the time the controller is expected to reach set point (plus the dead time (ϴ)). Setting the closed loop time constant to process time constant ratio (λ/Ƭ) to 1.0 will make the MV change to its final value and allow the process to settle out to the setpoint. Setting (λ/Ƭ) greater than 1.0 will give a slower responce. Setting (λ/Ƭ) less than 1.0 will cause the MV to make a larger change and then reduce to its final value. Tight tuning would be to set the close loop time constant to the dead time. Use the Integrating Process type (Ƭ = ∞) for both integrating processes or processes with long time constants. These processes use the maximum slope as the process gain. Tuning aggression for these processes is determined by setting the closed loop time constant to the dead time ratio (λ/ϴ). Once again, setting the closed loop time constat to the dead time gives tight control. References: “Probably the test simple PID tuning rules in the World,” Sigurd Skogestad, Jounal of Process Control, July 3, 2001 “Consider the generalized IMC-PID method for PID controller tuning of time-delay processes,” Y. Lee, S. Park, M. Lee, Hydrocarbon Processing, January 2006