Good afternoon all!
I was wondering if anyone could explain more clearly to me the tuning parameters of a PID instruction on a 1769 AB Compactlogix.
I currently trying to output a Hertz speed reference based of the tracking of a Dissolved Oxygen meter (PV 0-10 ppm) and an operator input setpoint (SP 0-10 ppm)
The PID is currently tracking but overshooting both ways by .3-.10 on average. I've been playing with the Pk Pi and Integral Time but can't seem to make any sense or get it to tune one way or another. I also tried deadband but saw how that wouldn't work either. Tried manipulating the loop execution time too and could notice results, just not the desired ones. I have been and will continue to search the web for clarification on the tuning parameters but thought I would run it by the experts here as well. Any input when you have time would be greatly appreciated.
I've attached screenshots of my PID parameters screens and logic rung.
Thanks a lot!
Ben
I was wondering if anyone could explain more clearly to me the tuning parameters of a PID instruction on a 1769 AB Compactlogix.
I currently trying to output a Hertz speed reference based of the tracking of a Dissolved Oxygen meter (PV 0-10 ppm) and an operator input setpoint (SP 0-10 ppm)
The PID is currently tracking but overshooting both ways by .3-.10 on average. I've been playing with the Pk Pi and Integral Time but can't seem to make any sense or get it to tune one way or another. I also tried deadband but saw how that wouldn't work either. Tried manipulating the loop execution time too and could notice results, just not the desired ones. I have been and will continue to search the web for clarification on the tuning parameters but thought I would run it by the experts here as well. Any input when you have time would be greatly appreciated.
I've attached screenshots of my PID parameters screens and logic rung.
Thanks a lot!
Ben