[foxboro] FCP vs. ZCP? (forked from: network storm)
- From: Corey R Clingo <corey.clingo@xxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Thu, 12 Feb 2009 12:34:56 -0600
"As a rule of thumb, I recommend FCPs over ZCPs in almost all cases."
Interesting comment. We are evaluating migration options here, and so far
have been assuming ZCP270s. Aside from being able to use existing racks
(which varies in importance from installation to installation, and may be
superseded by other factors), the ZCP has a 100Mbps fieldbus. That's
overkill for sure, but I was worried that the 2Mbps fieldbus of the FCP
might not be enough for the full 60-FBM complement, especially if using
many FDSI or DCI FBMs. The FCP advantages were simplified cabling and
less installation space (since it mounts in an FBM baseplate or something
similar).
But your statement below, that the ZCP lacks some software functionality
that the FCP has, is news to me. Are there plans to add it to the ZCP
image? Is FCP going to be the future direction (and in the process, will
ZCPs get end-of-life'd faster)? Are you going to have to keep them more
environment-controlled than the FBMs (we have already seen by accident
that the FBMs will not meet their stated ~140°F temperature ratings)?
Also, what is TDR/TDA? Those are TLAs I haven't heard yet.
Thanks,
Corey Clingo
BASF Corp.
"Johnson, Alex P (IPS)" <alex.johnson@xxxxxxxxxxxxxxxx>
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02/06/2009 01:52 PM
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Re: [foxboro] network storm
The FCP, ZCP, and FCM are designed to hold up under a storm though
communications to the FCM from a ZCP if both are on the MESH will be
impaired.
Since FCPs do not use FCMs, they will not have an issue in the event of
such a storm. They talk directly to the FBMs over an IEEE 1118 bus.
In general, I prefer to see the FBMs off the MESH. It just seems prudent.
The ZCP supports that mode of operation just as the CP60 did. However, you
do give up the V8 SOE mechanism and the TDR/TDA support under the ZCP
because it lacks those services in its image. The FCP does have them.
As a rule of thumb, I recommend FCPs over ZCPs in almost all cases.
Regards,
Alex Johnson
Invensys Process Systems
10900 Equity Drive
Houston, TX 77041
713 329 8472 (desk)
713 329 1600 (operator)
713 329 1944 (SSC Fax)
713 329 1700 (Central Fax)
alex.johnson@xxxxxxxxxxxxxxxx
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- » [foxboro] FCP vs. ZCP? (forked from: network storm) - Corey R Clingo
