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<== Date ==> <== Thread ==>

Subject: Re: PID Record
From: "Leonard J. Reder" <[email protected]>
To: Mark Rivers <[email protected]>
Cc: EPICS Tech-Talk <[email protected]>
Date: Thu, 01 Jun 2000 14:22:55 -0700
Hello Mark,

Thanks very much for the reply on the PID record.  I checked the
PID code and found that what you say is true.  The code for the
i term is:

i = kp*e*dt*ki;

so you are correct and this is why when the KP term is zero the
PID filter does not work.

As for your EPID record I would be interested in giving it a try.
Do you have a URL where I can get it.  Does it have documentation?
Do you have a Capfast symbol for it or do I have to creat one myself.

Thanks you very very much for the reply and look forward to
evaluating your EPID record.

Len


Mark Rivers wrote:
> 
> The integral term in the PID record uses KI*KP to control the integral gain.
> 
> I have written a new record, the EPID record which has a lot of features
> improve the PID record.  In particular it has sanity checks on the magnitude
> of the integral term, and it limits the output magnitude.  I can you
> (send) you information if you are interested.
> 
> Mark Tivers
> Sorry, bad typing, Mark Rivers

-- 
____________________________________________________
Leonard J. Reder
Jet Propulsion Laboratory
Interferometry Systems and Technology Section 383
Email: [email protected]
Phone (Voice): 818-354-3639
____________________________________________________


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