If configured properly, while in the track mode, the output of the = primary controller tracks the measurement of the secondary controller. = Therefore, the transition from manual or track, back to auto, will be bumpless (secondary controller measurement will equal its set point from the = primary controller). Joseph M. Riccardi DCS Services - Industrial Process Control Joe@xxxxxxxxxxxxx "To give real service you must add something that cannot be bought or measured with money; and that is sincerity and integrity." - Donald A. = Adams -----Original Message----- From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] = On Behalf Of IQUEIROLOO@xxxxxxxxxxxxx Sent: Wednesday, February 23, 2005 5:31 AM 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 AVISO LEGAL: Esta informaci=F3n es privada y confidencial y est=E1 dirigida = =FAnicamente a su destinatario. Si usted no es el destinatario original de este mensaje y = por este medio pudo acceder a dicha informaci=F3n por favor elimine el = mensaje. La distribuci=F3n o copia de este mensaje est=E1 estrictamente prohibida. = Esta comunicaci=F3n es s=F3lo para prop=F3sitos de informaci=F3n y no debe = ser considerada como propuesta, aceptaci=F3n ni como una declaraci=F3n de = voluntad oficial de REPSOL YPF S.A. y/o subsidiarias y/o afiliadas. La = transmisi=F3n de e-mails no garantiza que el correo electr=F3nico sea seguro o libre de = error. Por consiguiente, no manifestamos que esta informaci=F3n sea completa o precisa. Toda informaci=F3n est=E1 sujeta a alterarse sin previo aviso.=20 This information is private and confidential and intended for the = recipient only. If you are not the intended recipient of this message you are = hereby notified that any review, dissemination, distribution or copying of this message is strictly prohibited. This communication is for information purposes only and shall not be regarded neither as a proposal, = acceptance nor as a statement of will or official statement from REPSOL YPF S.A. = and/or subsidiaries and/or affiliates. Email transmission cannot be guaranteed = to be secure or error-free. Therefore, we do not represent that this information is complete or accurate and it should not be relied upon as such. All information is subject to change without notice. =20 =20 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at = your own risks. Read http://www.thecassandraproject.org/disclaimer.html =20 foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin to unsubscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave =20 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave