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