Re: [foxboro] PIDA parameters

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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Subject
[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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Tel : +27 11 458 5342
Fax : +27 11 458 5343
Mobile: +27 83 4535169
 
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      ~ Aristotle
 

 
 
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