s7-1200 pid stop
- Thread starter necyil
- Start date
Hello,
While I do not have a solution for you, in the olden days
we called this controller wind up/down. Back when PID was pneumatic/electro/mechanical.
The controller would go past a point where the change of inputs could never be great enough to 'un-wind'.
It was solved with hi/lo limits. Then the controller could never exceed X point, the point of no return.
The quick solution, until the system could be altered, was to switch from automatic to manual and back to automatic. Because the PID loop had output tracking, when in manual, to prevent bumps when switching modes, the loop could then unwind.
This is all assuming that the programming is all correct. Meaning not an error in coding. The error is in design.
I could be wrong.
While I do not have a solution for you, in the olden days
we called this controller wind up/down. Back when PID was pneumatic/electro/mechanical.The controller would go past a point where the change of inputs could never be great enough to 'un-wind'.
It was solved with hi/lo limits. Then the controller could never exceed X point, the point of no return.
The quick solution, until the system could be altered, was to switch from automatic to manual and back to automatic. Because the PID loop had output tracking, when in manual, to prevent bumps when switching modes, the loop could then unwind.
This is all assuming that the programming is all correct. Meaning not an error in coding. The error is in design.
I could be wrong.
KalleOlsen
Member
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