I am having issues with a PID block going to manual when the input PV status goes “BAD”, the block stays in manual until the PV status goes good then switches back to Auto.
I am trying to figure out a way to have it remain in Auto when the status goes bad but have not gotten anything to work yet. I have tried doing this which is from BOL:
“When the Uncertain if Limited option is selected, then as long as the input status is limited, the PV status will be set to Uncertain (even when the input status is Bad). Selecting this option and the Use Uncertain as Good option disables the mode from changing to Man under these condition when the target mode is Auto.”
But even with the above implemented it still switches to manual when the PV status goes bad.
The status is going bad as a flow meter gets over ranged 1-2 times a week as we are currently running right at the top end of the meter, we are working on upsizing the meter but until then I was wondering if there was anything I could do with the PID loop?
In reply to dmitriy sagadiev:
In reply to Matt Forbis:
Andre Dicaire