Re: [foxboro] Change CP40 to FCP270

The reason why I posted the question " Change CP40 to FCP270" was because
we have Zcp's in our Kallo site and no FCP's so we have no  experience with
FCP's, but for a US site we're thinking on upgrading to FCP's rather than
ZCP's, cheaper and easier.
I have to keep the FBM problem mentioned by Tom (FCP with old FBM100's) in
mind. That's good to know.

In our Kallo plant we have a mixture of FBM100 and FBM200. The FBM100's are
connected to the ZCP's by one pair of FCM100E's(PO972ZA) and multiple pairs
of FBI's (P0903ZE):

ZCP -->     FCM100E-->  FBI
                  FBI
                  FBI
                  ...

The FBM200's are connected to the ZCP's by FCM100E's

ZCP-->      FCM100E-->  FBM200's
      FCM100E-->  FBM200's
      ...

We have not experienced any problems with them so far, the FBM200's on one
FCM100 are usually less then 32

But it's good to know what Alex mentioned and I'll keep that in mind for
our future expansions also.

Thanks guys,

Dirk Pauwels - DCS/MOC coordinator
Engineering dept.
Hexion Specialty Chemicals
E mail: dirk.pauwels@xxxxxxxxxx
T.  +32.(0)3.570.95.97
F.  +32.(0)3.570.16.09
Mob. +32.(0)497.428.300


                                                                           
             "Johnson, Alex P                                              
             (IPS)"                                                        
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             .invensys.com>            <foxboro@xxxxxxxxxxxxx>             
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                                       Re: [foxboro] Change CP40 to FCP270 
                                                                           
             11/08/2008 01:00                                              
                                                                           
                                                                           
             Please respond to                                             
             foxboro@freelists                                             
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The configuration
ZCP -> FCM -> 30 FBMs

will have poorer (slower) I/O handling than

CP40 -> 30 FBMs

The FCM adds delay. However,

ZCP -> FCM -> 15 FBMs
    -> FCM -> 15 FBMs

will out perform the CP40 because the second FCM chain will be working in
parallel and the CP basically won't have to wait for its readings.


ZCP -> FCM -> 10 FBMs
    -> FCM -> 10 FBMs
    -> FCM -> 10 FBMs

will be even faster.

If the chains aren't balanced, list the short chain first in the ECB
compound. The long chains will run in parallel and generally will complete
by the time they are asked for data or will delay only briefly.


Make sense?

AJ


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx on behalf of William C Ricker
Sent: Sun 8/10/2008 10:20 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Change CP40 to FCP270

We have about 30 FBMs, all in a single IE32, all on a single FCM pair.
Yes, and the FCM  is first in the _ECB compound, and there are no other
FBMs in that ZCP yet, so all are on the same FCM.

We are hoping/expecting that any future expansion of IO will come with
200 series.

I'd be interested in more info on this.

Thanks
William C Ricker
FeedForward, Inc.


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Johnson, Alex P (IPS)
Sent: Saturday, August 09, 2008 7:15 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Change CP40 to FCP270

Chris,
What is the FBM counter per FCM?

The reason that I ask is that a ZCP can be slower than the CP30 for some
applications if the majority of the FBMs are on one FCM and that FCM is
referenced first in the ECB compound.

AJ






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