Re: [foxboro] FCP's and "remote" I/O

On Tue, Mar 31, 2009 at 12:50:51PM -0400, Johnson, Alex P (IPS) wrote:
> BTW, the PSS for the FCM2Fx is: PSS 21H-2Y3 B3.
> 
> I have a couple of problems with this document:
> 
> 1) The product is misnamed. It should be the FO Extender for Copper
> Fieldbus because it is not an FCM. It's a FO Repeater. It looks like
> wire to the system.
> 2) The picture is too limiting. It shows the FCM2Fx on the baseplate
> with the FBMs. This is the "wrong" way to do it. The FCM2Fx doesn't need
> a "named" baseplate because it's not addressed; it's wire.
> 
> I would suggest that:
> 
> 1) The FCPs sit on a 4 port baseplate
> 2) The FCMs sit on the same 4 port baseplate
> 
> This configuration gives a Cu fieldbus for local FBMs and a FO fieldbus
> for remote FBMs.
> 
> 3) Put the next pair of FCMs on a 2-port baseplate. 
> 4) Connect the 2-port baseplate to the FBM baseplates using Cu.
> 
> CP-+ -(cu)- FBMs
>    |
>    + FCM2Fx - (fo) - FCM2Fx -(cu)- FBMs
> ------------         ------        -----------
> Std 4-port bp       2-port bp      Std 2/4/8 port bp 
> 
> 
> Does this help a little more?     
> 
Indeed, it doe, but I need to ask a followup question. can I do something
like this:

CP-+ -(cu)- FBMs
   |
   + FCM2Fx - (fo) - FCM2Fx - (fo) FCM2Fx - -(cu)- FBMs
------------         ------     -------      -----------
Std 4-port bp       2-port bp    2-port bp   Std 2/4/8 port bp 
                    |
                    | (cu)
                    |
                                        BP



-- 
One of the main causes of the fall of the roman empire was that, lacking
zero, they had no way to indicate successful termination of their C
programs.
 
 
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