Re: [foxboro] CP60 and FBM legacy

Jaime

As a general rule of thumb we've been using a pair of DCMs for each 25-30 FBMs.
 More FBMs than that seems to cause significant I/O loading.  Loading varies
depending on the type of FBM.  Digital FBMs running ladder logic seem to cause
higher I/O loading than those running cin/cout.  Intelligent transmitter FBMs
caused such high loading during one upgrade that we replaced them with 4-20
transmitters and FBMs.

We've used the CP60 sizing spreadsheet but have found it too conservative to be
useful - real world loadings have been nowhere near what the spreadsheet
predicts so far.  It needs to be more accurate to be a useful tool.

One other note -- if you're using DCMs with 1x8 racks, bear in mind the PDUs
only provide power on two of their 4 plugs.  All four plugs are powered when
used with IE32 or IE16s.

Regards,

Kevin FitzGerrell
Carter Holt Harvey, Ltd.
+64 27 460 9994

Quoting "Jaime Claramunt R. (Inforsa)" <jclaramunt@xxxxxxxxxxxxxxx>:

> yeah... when I said 0.5s I meant the main cycle of CP... not 0.1s as is
> allowed now with CP60. (sorry)
> sure, we have most of blocks at 1s, so 2 phases to run them...
> by now we are trying to reduce overruns by doing some "phasing" but just
> to
> assure system 'till we found permanent solution.
> 
> about how many fbm for this CP... around 50 , in 3 distributed
> cabinets.
> I/O load increased very much... twice I'ld say...
> This approach (more DCM) is what local rep is aiming for now...
> 
> 
> 
> 
> -----Mensaje original-----
> De: foxboro-bounce@xxxxxxxxxxxxx
> [mailto:foxboro-bounce@xxxxxxxxxxxxx]En
> nombre de joseph wu
> Enviado el: Viernes, 21 de Octubre de 2005 10:08
> Para: foxboro@xxxxxxxxxxxxx
> Asunto: Re: [foxboro] CP60 and FBM legacy
> 
> 
> 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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