Re: [foxboro] Reduce IFL's for FBM
- From: "Marchal, Andre L." <AMarchal@xxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Thu, 12 May 2005 14:04:53 -0600
I wish there were a way to get a cross reference list for all the PLB =
blocks linked to one FBM. The way I do it is to go to FBM/Ladder =
assignment, get the list of PLB blocks, then get the cross reference =
list for each block and make by hand a summary sheet. Is there a better =
way?
Andre
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Johnson, Alex
(Foxboro)
Sent: Thursday, May 12, 2005 12:16 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Reduce IFL's for FBM
A few facts:
* You may have multiple (8, I think) PLB blocks per FBM.
* An FBM has a fixed number of rungs (100 or 150 I think) with a
fixed number of symbols (500, I think).
* The number of PLB blocks DOES NOT increase the number of IFLs,
OFLs, rungs, and symbols.
* The use of multiple PLBs per FBMs is a good way to go crazy -
trust me on this.
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Does this help?
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Regards,
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Alex Johnson
Invensys Process Systems
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (voice)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx
=20
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Douglas G. Lloyd
Sent: Thursday, May 12, 2005 1:13 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Reduce IFL's for FBM
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Before you folks get too carried away, I don't think that you get more =
IFLs
or OFLs by splitting up the PLB into multiple blocks. These resources =
are
maintained in the FBM itself, with supporting logic in the PLB blocks. =
In
fact, when using multiple PLB blocks you need to be very careful about
overlapping resources. If resources ARE overlapped, the last processed
block "wins" and overwrites any previous logic.
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Regards,
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Doug Lloyd
DGL Controls
=20
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Dirk Pauwels
Sent: Thursday, May 12, 2005 11:28 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Reduce IFL's for FBM
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That's interesting, I've never tried it either, the number of cout's is=20
still restricted to the FBM, but more ifl's offer more possible =
interlocks.
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Rgds,
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Dirk
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>From: brad.s.wilson@xxxxxxxxxxxxxx
>Reply-To: foxboro@xxxxxxxxxxxxx
>To: foxboro@xxxxxxxxxxxxx
>Subject: Re: [foxboro] Reduce IFL's for FBM
>Date: Thu, 12 May 2005 10:21:37 -0500
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> >>> Martin Theobald wrote <<<
>Reading the documentation (Volume 3 of B0193AX - Rev N) suggests that =
each
>FBM can support up to eight PLB blocks. This is not a feature I have =
tried
>or seen used.
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>Yes, we have a couple of FBMs with multiple PLBs, although I remember =
that
>there is a limit to the TOTAL number of lines in all PLBs running in an
>FBM. I seem to recall that the number of lines allowed in an FBM is =
the
>constant, regardless of the number of PLBs. But this would certainly =
allow
>for more IFLs & OFLs.
>=20
>Brad Wilson
>ExxonMobil Chemical Co
>Edison Synthetics Plant
>732-321-6115
>732-321-6177 fax
>Brad.S.Wilson@xxxxxxxxxxxxxx
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