Re: [foxboro] CP60 Sizing
- From: dirk.pauwels@xxxxxxxxxx
- To: foxboro@xxxxxxxxxxxxx
- Date: Thu, 22 Apr 2010 12:23:15 +0200
I used the CP overload and FB/CP load trends to pursuade management to
upgrade to ZCP270's before we started a project involving a lot of I/O's
and extra automation. A simple extrapolation/simulation based on I/O and
IND's etc we added during the last year before the upgrade, showed the
CP/FB load would exceed limitations as desribed by Foxboro. You could
easily see an increase in overloads and load on the simulation.
In our case this ment upgrading to mesh and ZCP270, because we were
strictly unix - CP60 before. For a small site like ours this was a major
investment, but compared to the total price of the project, the upgrade
cost was reasonable (thanks to advantage upgrades)
Upgrading to ZCP270's went smooth, we were never happy with the CP60's
anyhow....
Even if management does not understand anything about I/A, they usually
understand graphs....
Rgds,
Dirk
Ainuddin Ali <ainuddin@xxxxxxxxx>
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22/04/2010 11:41
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Re: [foxboro] CP60 Sizing
Don
i'm on IA 7.1.1 + CP60 too and currently in the midst of justifying CP
upgrade to my management.
pls find sample CP loading sheet for existing CP60 vs upgraded CP270 for
my
plant.
details of the calculation - u have to refer docs mentioned by Alex below.
Regards.
AINUDDIN ALI
PRAI POWER PLANT
PENANG, MALAYSIA
On Thu, Apr 22, 2010 at 2:38 AM, Johnson, Alex P (IOM) <
Alex.Johnson@xxxxxxxxxxxx> wrote:
> There are very detailed sizing guidelines for the controllers.
>
> In particular,
>
> 1) The I/A Series MESH Control Network System Planning and Sizing
> manual B0700AX provides guidelines for loading of all MESH based
> stations including idle time recommendations. See Table 3-9 to start.
> 2) The (non-MESH) I/A Series System Planning and Sizing manual B0193BF
> Provides guidelines for loading of all Nodebus based stations
> including idle time recommendations. See Chapter 2 - Recommended
> Maximum Loading.
>
> Besides the recommendations in that manual, there are controller
specific
> sizing manuals:
>
> 1) The FCP270s sizing document is B0700AV.
> 2) The ZCP270s sizing document is B0700AW.
> 3) The CP60s sizing document is B0400BK.
>
> There are sizing spreadsheets to complement these documents.
>
> I hope that this is of value to you.
>
>
> Regards,
>
> Alex Johnson
> Invensys Operations Management
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