Re: [foxboro] PIDA parameters
- From: James D Murphy <MURPHY_JAMES_D@xxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Mon, 26 Sep 2005 08:57:10 -0500
Here are three pages that depict the difference.
www.controlviews.com/question12-12-03.html
www.expertune.com/PIDspec.htm
www.20sim.com/webhelp4/library/signal/Control/PID_Control/PIDControllerTypes.htm
Quote from www.reference.com/browse/wiki/PID_controller follows:
There are three different forms of the PID controller. They are the
standard or "non-interacting" form, the series or "interacting" form and
the parallel form. The standard form is the ideal form where the terms are
noninteracting in the time domain. The series or "interacting" algorithm
applies the gain term to both integral and derivative terms (think of a PD
and PI controller in series); this is effectively how older pneumatic and
some analog controllers worked. It is the most restricted form of the
three. The parallel form is the most general, "mathematician's" form and
is the most flexible of the three. However, it is also the form where the
parameters have little physical interpretation. It is mostly used when
tuning the PID algorithm mathematically.
Jim Murphy
Ashley Davey <Ashley.Davey@xxxxxxxxxxxx>
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09/26/2005 03:24 AM
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[foxboro] PIDA parameters
Hi List
I have several PIDA control block configured with the "MODOPT" parameter
set to 6.
In the FoxDoc (B0193AX - Rev N) I have found that this means that
"non-interacting PID - sum of terms" has been selected.
Can somebody please explain (very briefly if possible), the difference
between "non-interacting PID" and "PID - product of factors"?
Thank you.
Ashley Davey
Systems Engineer
African Products (Pty) Ltd
Gauteng
Republic of South Africa
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