We had to create it once as the Fox help desk was, well, no help.
We used Foxboro's original 1970-something document on PID equations (ancient
thing) that the IA stuff was based on. I will try to dig up what we got.
It's a coupled equation, which is a big bother from a control theory side, but
was apparently the thing to do with the original pneumatic controllers. Also,
you have to work in the time domain to get the full effect of what the thing is
doing (again, not too elegant).
Kirk
Kirk Carver
ExxonMobil
BPEP
(409) 860-1314
email: [EMAIL PROTECTED]
Eudilson Núñez Cossio <[EMAIL PROTECTED]> on 03/20/2001 08:40:05
AM
Please respond to "Foxboro DCS Mail List"
<[EMAIL PROTECTED]>
To: "'Foxboro DCS Mail List'" <[EMAIL PROTECTED]>
cc: (bcc: Kirk D Carver/Beaumont/Mobil-Notes)
Subject: RE: PID equations
Ben,
What I need is the exact equation.
The section that you mention is only philosophical, I think.
Thanks.
-----Mensaje original-----
De: Mansfield, Ben [mailto:[EMAIL PROTECTED]]
Enviado el: Martes 20 de Marzo de 2001 7:51 AM
Para: 'Foxboro DCS Mail List'
Asunto: RE: PID equations
I believe you'll find what you're looking for in the Foxboro document
B0193AX, "Integrated Control Block Descriptions" in the PID, PIDA, etc.
chapter. There is a section towards the end called "Detailed Operation"
that describes how the output is computed based on the controller mode
(MODOPT).
Ben
-----Original Message-----
From: Eudilson Núñez Cossio [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 20, 2001 11:57 AM
To: 'Foxboro DCS Mail List'
Subject: PID equations
Hi list,
I looking the equation for PID controllers that exist on I/A Foxboro.
Someone can send me this information?
Thanks in advanced.
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