Re: [foxboro] CALC block
- From: "Bolting, Brett C." <Brett.Bolting@xxxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 7 Jan 2004 08:18:09 -0600
Well, for my two cents...
Yes, I suppose if your upstream block and/or our process is fast enough =
there could be different values between those two reads..
You could either adjust your period and phasing on the two blocks or =
better yet I think would be to just read the value you now have=20
going to RI01 to a memory location the pull that value into your =
sequence form the memory location with a LAC Mxx command.
Brett Bolting
Process Control Specialist
Equistar Chemicals
(361) 572-2570
(361) 270-8197 beeper
--
"They that would give up essential liberty for temporary safety deserve =
neither liberty nor safety."
-- Benjamin =
Franklin
> -----Original Message-----
> From: IQUEIROLOO@xxxxxxxxxxxxx [SMTP:IQUEIROLOO@xxxxxxxxxxxxx]
> Sent: Wednesday, January 07, 2004 7:47 AM
> To: foxboro@xxxxxxxxxxxxx
> Subject: [foxboro] CALC block
>=20
> Hi list, I have a question about the CALC block. Suppose that we have =
a =3D
> CALC block with this instruction in the first line:
>=20
> Step 1 IN RI01
>=20
> and the same instruction is repeated in the 40th line, as follows:
>=20
> Step 40 IN RI01
>=20
> If the value of RI01 has changed in the time between those two steps =
in =3D
> the same BPC, the values that the block will read will be different?.
>=20
> Suppose that the CALC block and the block where the value of the RI01 =
=3D
> comes from are in the same compound.
>=20
> Thanks,
>=20
> Ignacio Queirolo Olivera
> Repsol YPF
> Tel: +54 221 429-8400 ext. 26481
> Fax: +54 221 429-8400 ext. 26272
> mailto:iqueiroloo@xxxxxxxxxxxxx
>=20
>=20
>=20
> AVISO LEGAL:
> Esta informaci=3DF3n es privada y confidencial y est=3DE1 dirigida =3D
> =3DFAnicamente a su destinatario. Si usted no es el destinatario =
original =3D
> de este mensaje y por este medio pudo acceder a dicha informaci=3DF3n =
por =3D
> favor elimine el mensaje. La distribuci=3DF3n o copia de este mensaje =
=3D
> est=3DE1 estrictamente prohibida. Esta comunicaci=3DF3n es s=3DF3lo =
para =3D
> prop=3DF3sitos de informaci=3DF3n y no debe ser considerada como =
propuesta, =3D
> aceptaci=3DF3n ni como una declaraci=3DF3n de voluntad oficial de =
REPSOL YPF =3D
> S.A. y/o subsidiarias y/o afiliadas. La transmisi=3DF3n de e-mails no =
=3D
> garantiza que el correo electr=3DF3nico sea seguro o libre de error. =
Por =3D
> consiguiente, no manifestamos que esta informaci=3DF3n sea completa o =
=3D
> precisa. Toda informaci=3DF3n est=3DE1 sujeta a alterarse sin previo =
aviso.=3D20
>=20
> This information is private and confidential and intended for the =3D
> recipient only. If you are not the intended recipient of this message =
=3D
> you are hereby notified that any review, dissemination, distribution =
or =3D
> copying of this message is strictly prohibited. This communication is =
=3D
> for information purposes only and shall not be regarded neither as a =
=3D
> proposal, acceptance nor as a statement of will or official statement =
=3D
> from REPSOL YPF S.A. and/or subsidiaries and/or affiliates. Email =3D
> transmission cannot be guaranteed to be secure or error-free. =
Therefore, =3D
> we do not represent that this information is complete or accurate and =
it =3D
> should not be relied upon as such. All information is subject to =
change =3D
> 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
Other related posts:
