I would assume that your refinery is similar to ours in the sense
that the process units come down at different intervals for turn-around
maintenance. With that in mind, by connecting I/A nodes through the
carrier-band LAN you may run into issues.
1) You may end up with different versions of I/A on the nodes. This could
lead to incompatibility.
2) Depending on the criticality of the control, it could become difficult
to take the node owning the AOUT off-line. Again, effecting
maintenance/upgrades.
3) If your process units are treated as individual units, ownership of the
final element, i.e. valve, will need to be clearly defined.
Anyway......just some rambling thoughts.
________________________________
James J. H. Dykes
Tosco Corporation
Avon Refinery
mailto:[EMAIL PROTECTED]
Phone:(925) 228-1220 Ext. 2930
> -----Original Message-----
> From: Murphy, Daniel J [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, March 30, 2000 2:54 PM
> To: 'Foxboro DCS Mail List'
> Subject: RE: Detection of nodebus-failure
>
> I would be interested to know what the concensus is out there for doing
> regulatory control across the carrier-band LAN. For example, one PID block
> in one node talking to an AOUT block in another node.
>
> Here we don't trust the CB-LAN to do basic regulatory control. We prefer
> to
> hardwire the signal via FBM's. Anyone else do the same?
>
> The same question applies to peer-to-peer communications within a node.
> Anyone hardwire these connections as well?
>
>
> Dan Murphy
> BP Amoco Refinery
> Brisbane Australia
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