sparkytex
Lifetime Supporting Member
So were commissioning all the PID loops I had programmed to work with the new wonderware HMI system that was installed. Got all but 1 tuned pretty damn good. This last one is a FIC-7012 which is a flow transmitter ranged 0-150" (DP cell) which is square rooted inside the instrument then sends the 4-20 mA signal to the PLC 5 processor. This damn flow transmitter is bouncing quite a bit at the low end and is causing the PID to chase a lot, and due to the fact the PID runs at the lower end it makes this difficult. I know there's a way I can smooth out the signal so its more of an average value so the PID can handle it easier. How do I got about averaging this value, its scaled 0-4095 raw data in I/O config (N22:9)
2.) I need to change the PID enable scan time to .250 seconds, I know I can use a timer on the .01 time base and a pre-set of 25. But how do I change it in the PID update time, do I just type in .250, I've faulted processors in the past typing in wrong update times for the PID control so I'm double checking?
this flow control is the only thing slowing preventing us to run as of now and I'd like to get this smoothing figured out as well as the PID update time. Any help is much appreciated right now!!
cheers, Tex
2.) I need to change the PID enable scan time to .250 seconds, I know I can use a timer on the .01 time base and a pre-set of 25. But how do I change it in the PID update time, do I just type in .250, I've faulted processors in the past typing in wrong update times for the PID control so I'm double checking?
this flow control is the only thing slowing preventing us to run as of now and I'd like to get this smoothing figured out as well as the PID update time. Any help is much appreciated right now!!
cheers, Tex