Re: [foxboro] Reduce IFL's for FBM
- From: "Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Thu, 12 May 2005 14:16:27 -0400
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.
Does this help?
Regards,
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
-----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
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.
Regards,
Doug Lloyd
DGL Controls
-----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
That's interesting, I've never tried it either, the number of cout's is
still restricted to the FBM, but more ifl's offer more possible interlocks.
Rgds,
Dirk
>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
>
> >>> 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.
>
>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.
>
>Brad Wilson
>ExxonMobil Chemical Co
>Edison Synthetics Plant
>732-321-6115
>732-321-6177 fax
>Brad.S.Wilson@xxxxxxxxxxxxxx
>
>
>
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_______________________________________________________________________
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Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
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