Re: [foxboro] PI Server to I/A
- From: duc.do@xxxxxxxxxxxxxx
- To: foxboro@xxxxxxxxxxxxx
- Date: Fri, 23 Jan 2004 11:22:36 -0500
William,
We also migrated to this automatic fail-over between two PI interfaces a
couple of years ago, but had to abandon it for several reasons.
Our two PI interfaces serve the whole plant, each essentially covers half
the plant, so when one fails and the other has to pick up, it has to double
the data traffic passed to the PI system. The extra load created problems
for our particular set-up. It may work well elsewhere without the same load
we saw.
Another problem is the additional peer-to-peer connection on the CPs for the
back-up interface (even though the data is collected through only one
interface at any given time), and with the proliferation of CP-10s in our
system at the time, we couldn't afford to spare the connection from the
limited number each CP-10 has.
Just a couple of caveats from one who's been there, done that.
Duc
--
Duc M. Do
Dow Corning Corp.
Carrollton Plant
Carrollton, KY, US
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of William C. Ricker
Sent: Friday, January 23, 2004 10:47 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] PI Server to I/A
Also, note that there is a fault tolerant version of the PI
software. It connects the NT PI Server to 2 IA stations.
Switching from the failing IA station to the backup is quick
and automatic. Internally, monitoring involves a block or two
located in a CP.
I was part of a group that started up a very early version in
2002 (maybe the first redundant PI on an IA link). The startup
went quite cleanly, and it has been operating since, as I
understand, quite without problems.
William C. Ricker
FeedForward, Inc.
Marietta, GA, USA
wcricker@xxxxxxxxxxxxxxx
770-426-4422
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of MUGARTET@xxxxxxxxxxxxx
Sent: Friday, January 23, 2004 7:10 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] PI Server to I/A
Jaime,
If you have a second AW on the node you can install de PI interfase on =
it, and keep it off-line. When you shut down the "main" AW (the one with =
the PI-IF running) you start the "spare". The loss of data should be =
minimum. Check with the PI representative for license issues, but I =
think it shouldn't be a problem since you are always using one IF at a =
time.
Regards,
Mart=EDn
-----Mensaje original-----
De: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]En
nombre de Jaime Claramunt R. (Inforsa)
Enviado el: Viernes, 23 de Enero de 2004 09:03
Para: foxboro@xxxxxxxxxxxxx
Asunto: [foxboro] PI Server to I/A
Hi list,
Does anybody have a PI Server connected to Nodebus ? is it possible ?
We have a PI service running inside one AW51, and then connected to our LAN
through 2nd ethernet port.=20
The issue is when this station is down (maintenance or shutdown or reboot)
all our process data (10 processors) is lost. Today is becomming a big issue
because we summarize this data for daily reports...you canimagine the phone
ringing from big boss when there are some "extrange" values ...
Thanks
Jaime Claramunt
INFORSA Paper Mill
CHILE
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
Other related posts:
