Re: [foxboro] Change CP40 to FCP270

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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