rupeje Posted February 2, 2016 Report Share Posted February 2, 2016 Has anyone had any luck implementing a deadband for their PIDs? I don't see a built-in option for that, and I'm wondering how to go about it. Can you do it by disabling the PID net when the process variable is within the deadband (after zero-crossing or other scheme), and then re-enable the net when the process variable goes outside of the deadband, or would that cause issues with the integral calculation? Quote Link to comment Share on other sites More sharing options...
Walkerok Posted February 5, 2016 Report Share Posted February 5, 2016 There is nothing pre-built into the PID function block to give you this ability but you can write it for yourself easy enough. You decide when you want to run a PID loop in your ladder. You can suspend a PID whenever your current value is within a dead band you hardcode in the ladder around a set point, or make it settable on a screen. (there is a pause I and D calculations block that will stop calculations for as long as you say. You can stop the entire PID loop when you are within the dead band for a period of time. Your choices as a programmer. Good Luck Keith Quote Link to comment Share on other sites More sharing options...
rupeje Posted February 6, 2016 Author Report Share Posted February 6, 2016 Thanks for the help! I've written some code for zero crossing, I'll give it a test when I get a chance. Quote Link to comment Share on other sites More sharing options...
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