Re: [foxboro] CP60 and FBM legacy

Troy,

People should use the CP60 loading spreadsheet on the EDOC CD to
perform their "what if" analysis.  I suspect that this spreadsheet will
show Jaime's CP60 fieldbus - overloaded.  Although this thread started
out as a loading question that has been answered by Alex, you now bring
up a side issue that can affect systems.

The best performance comes when FBM's (ECB's) run at the same scan rate =
as the blocks.  For example - FBM04 (mA) at 1.0 sec to AIN at 1.0 sec to =
PID at
1.0 sec to AOUT at 1.0 sec back to FBM04 (could be different l'bug) with =
ECB
at 1 sec.  You can phase the blocks if the basic processing cycle =
(BPC)is
0.5 seconds and as long as you set the PRI correctly, all is OK.

If you run your ECB's at 0.5 seconds in the above example, your 1 s AIN =
will
ignore half the mA input changes. On fast changing signals, this might
get you in trouble.  If the signal is not fast changing, then you could =
be
OK.  You can run all at 0.5 sec but you need to carefully check loading.
In any case, you never want to overload your CP.

Regards,

Terry


-----Message d'origine-----
De=A0: foxboro-bounce@xxxxxxxxxxxxx =
[mailto:foxboro-bounce@xxxxxxxxxxxxx] De la part de Troy L Brazell
Envoy=E9=A0: October 21, 2005 9:32 AM
=C0=A0: foxboro@xxxxxxxxxxxxx
Objet=A0: Re: [foxboro] CP60 and FBM legacy


Question ......... The CP60s should run at .5 BPC ..... correct? The =
only
time that I have setup CPs at anything other than a .5 BPC is when used =
in
Expander Compressor controls. In this case I set the BPC at .1.
Then the period on the blocks in this CP should have a period based on =
the
required process speed. We typically use 1 second for most control
applications, temperatures we run at 30 seconds or greater if used for
indication only.
We have upgraded numerous CP40s to CP60s and have always seen a =
significant
drop in the processor loading.

Troy L. Brazell
Duke Energy Field Services
Sr. Process Control Analyst
ISA CCST
Phone (405) 263 4688 ext. 30
Cell    (806) 898 4340
Okarche Plant
Route 3 Box 95
Okarche, OK. 73762
*****************************
MS Windoze the cure for Insomnia
*****************************


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                                       Re: [foxboro] CP60 and FBM legacy =
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             10/21/2005 08:07                                            =
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Running at 0.5 sec only allow one phase (0).  CP60 can hold a lot more
blocks than the older version.  It does not mean you can run all the =
blocks
in the CP in the same phase.  There is a running limit (Don't recall
exactly but is about the same as older version CP).  Try running other
blocks in a slower scan rate.  You must have a very special application =
to
run all blocks in 0.5 sec.

Picure it as trying to pick up as many fish in a barrel witrh your bare
hands.  Even though the barrel get bigger, it does not mean you can pick =
up
more fish with the same two hands.

Good luck!
"Jaime Claramunt R. (Inforsa)" <jclaramunt@xxxxxxxxxxxxxxx> wrote:
Hey List...

We recently upgraded one of our 10 CP40A-FT to CP60FT. (well, with all =
net
changes required... V7.x, FO switches, etc)
We found a prob here...
CP60 new loads are very high... control loads... running at 0.5s , it's
reaching 112% and 44% (phase 0,1). Worse than our old CP40...
We used one pair of DCM to interfase new CP60 and existent legacy =
fieldbus
(3 remote racks, pair of PIO each)

We are working with our local reps. but not too much clues yet...

Does anybody has some hints ??

Thx. Regards,

Jaime Claramunt
INFORSA Paper Mill
CHILE


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