(thats why) Your going to have to work out the logic for this transition depending on your application, which you didn't state, but sometimes ![]() Put the inactive loop in manual and zero (or full range) it's output when it is not in control so that when PV crosses SP and the loop switches back on you don't get a bump in the output. Then scale the output of one to 50-100% and the other 0-50% of your CV, then use a LIM (limit test) to apply one or the other to your analog output address. Let both PIDs function in their full output range 0-16383 (you'll see why in a minute). Here are two approaches you might take.ġ) You will have to use two pid loops. The AB PID only supports forward (E=PV-SP) or reverse (E=SP-PV) acting but not both simultaneously. Regardless of the application, this can be done. ![]() I suspect you either have a hydraulic servo valve spool position control, heat/cool application, anĪccelerate/brake application, or a drag-up system. I think everyone so far missed your question.
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