Re: [foxboro] Windup in cascade configuration

Yes,
please check also the LIMOPT parameter; this parameter specifies the
unti-windup strategy.
Hope this will help.

Omar Hafez
Senior Lead Engineer
Invensys Engineering & Services-Egypt
T + 20 2 754 9280
F +20 2 516 8855
M +20 10 1833386
E-mail: omar.hafez@xxxxxxxxxxxxxxxx


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx =
[mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of IQUEIROLOO@xxxxxxxxxxxxx
Sent: Wednesday, February 23, 2005 12:31 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Windup in cascade configuration

Hi folks,
=20

I have some questions about the cascade configuration of two PID =
blocks. In
case of clamping in the secondary block, what happens with the output =
of the
primary block?

For example, if the secondary block clamps at 50% output, I think that =
the
primary block should not keep integrating because in this a windup can =
occur
at its output.

If I am right, the anti-windup works when the BCALCO of the secondary =
block
goes to the FBK and BCALCI of the primary block. Do I need anything =
else to
prevent windup?

=20

Thanks in advance,

=20

Ignacio Queirolo Olivera

Control Avanzado

Complejo Industrial Ensenada

Repsol YPF - Qu=EDmica

Tel.: 54 221 429-8400 ext. 26481

Fax: 54 221 429-8400 ext. 26209

iqueiroloo@xxxxxxxxxxxxx <mailto:iqueiroloo@xxxxxxxxxxxxx>=20

=20



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