Re: [foxboro] PI question
- From: "Schueppen, Martin" <Martin.Schueppen@xxxxxxxxxxxx>
- To: "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 28 Apr 2003 13:43:21 -0400
> The PI-API uses the "secured write" mechanism - it builds lists to =
write
> values.
> With a "secured write" you can write "block input parameters" only.
> Unfortunately
> the VALUE-parameters of the VALUE-Blocks are "output parameters".
> Output-parameters - like VALUE, SPT ... - can be written with =
"unsecured
> writes" -=20
> and under some more special conditions (MA...) - only. BUT !!! =
unsecured
> writes increase
> nodebus traffic significant!!!=20
>=20
>=20
> Martin Sch=FCppen
> Senior IT Specialist/Consultant
>=20
> Invensys Systems GmbH
> Heerdter Lohweg 53 - 55
> 40549 Duesseldorf
> Tel.: +49 (0)211 5966-108
> Fax: +49 (0)211 5966-167
> Mobile: +49 (0)173 7271326
> E-Mail: Martin.Schueppen@xxxxxxxxxxxx
> http://www.invensys-process-systems.de=20
>=20
>=20
> =20
>=20
> -----Original Message-----
> From: MUGARTET@xxxxxxxxxxxxx [SMTP:MUGARTET@xxxxxxxxxxxxx]
> Sent: Montag, 28. April 2003 15:40
> To: foxboro@xxxxxxxxxxxxx
> Subject: Re: [foxboro] PI question
>=20
>=20
>=20
> We use both CALC (RI's) and AIN blocks (these with IOMOPT =3D3D 2). =
We =3D
> tried REAL.VALUE, for the same reasons as you but couldn't get them =
to =3D
> work. We've been able to use them with other applications (Fortran =
code =3D
> running on an AW and with Aspen's DMC) so there must be something on =
the =3D
> PI-API.
>=20
> Mart=3DEDn R. Ugarte
> Control Avanzado y Sistemas
> Refiner=3DEDa La Plata - RepsolYPF
> * +54-221-4298310 ext. 28034
> 7 +54-221-4298310 ext. 28033
> * <mailto:mugartet@xxxxxxxxxxxxx>
>=20
> -----Mensaje original-----
> De: Lowell, Tim: [mailto:Tim.C.Lowell@xxxxxxxxxxxxxxxxxx]
> Enviado el: Viernes, 25 de Abril de 2003 15:38
> Para: foxboro@xxxxxxxxxxxxx
> Asunto: [foxboro] PI question
>=20
>=20
>=20
> Here's a question for all you PI-on-Foxboro gurus out there. I was =
=3D
> trying
> to build my first PI output tag, meaning a tag whose value I can =
change =3D
> from
> a spreadsheet, for example, and have it automatically update on the =
I/A
> system. It took several attempts using trial and error to identify a
> Foxboro "object" that was compatible with this kind of operation. I
> eventually ended up with getting a CALC.RI01 parameter as the
> "InstrumentTag" in PI to work. I tried a REAL.VALUE and a CALC.M01, =
and
> neither one of those worked. =3D20
>=20
> Does anyone have a list of which types of Foxboro objects can be =
written =3D
> to
> by PI? I really wanted to use the REAL.VALUE, because those blocks =
=3D
> don't
> take up any scan time. Are those available to be written to, and I =
just
> didn't do it right? Are AOS objects an even better solution? What =
do =3D
> most
> people use for PI output tags?
>=20
> Tim Lowell
> Control Systems Engineer
> ConocoPhillips, Trainer Refinery
> Phone: 610-364-8362
> Fax: 610-364-8211
> Tim.C.Lowell@xxxxxxxxxxxxxxxxxx
>=20
>=20
> =3D20
> =3D20
> =
_______________________________________________________________________
> 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
> =3D20
> foxboro mailing list: =
//www.freelists.org/list/foxboro
> to subscribe: =3D
> mailto:foxboro-request@xxxxxxxxxxxxx?subject=3D3Djoin
> to unsubscribe: =3D
> mailto:foxboro-request@xxxxxxxxxxxxx?subject=3D3Dleave
> =3D20
> =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:
