[foxboro] 51B and 51B workstations: which policy?

Hi list,

We have started to migrate from IAS 6.3 to IAS 8.x. The new plant from 
our site if fully in IAS 8.x and ATS cards are used to connect nodebuses 
to the new MESH network.
The old plants will still keep their nodebus hosted my some AW51B and 
AW51D. The nodebus system will be kept a few years more.
My question is: which policy to maintain thes workstations? Stock items 
that compose any workstation (hard disk, motherboard, ...)? Get new Sun 
workstation that can keep safe IAS applications (what about the waranty 
from Invensys Foxboro then?)? I'm not interested by the solution P92 + 
DNBT because there is not supervision anymore in theses places 
(centralised supervision, nodebuses are linked by a LAN network).
I hope my question is understandable enough.

Bye.
Stevan
 
 
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