Re: [foxboro] Daylight savings and OSI PI
- From: "Nadeau, Sylvain" <snadeau@xxxxxxxxxx>
- To: "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 27 Oct 2003 11:44:30 -0500
Below is a posting from last April that describes the TCP TimeSynch
application.
Regards,
Sylvain.
Sylvain Nadeau
Systems Integration & IT
Invensys Process Systems
INVENSYS SYSTEMS CANADA INC.
snadeau@xxxxxxxxxx
514-421-8107
Fax:514-421-8054
-----Original Message-----
From: Nadeau, Sylvain [mailto:snadeau@xxxxxxxxxx]
Sent: April 29, 2003 3:50 PM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: Re: [foxboro] Time Synchro
The TCP Timesynch is a comprehensive package that we have been
providing to I/A customers inside and outside of North America
for a while now. The package is available for both the 51 and the 70 series.
The package allows you to synchronize the IA master time keeper on the IA
node with an external time reference showing the local wall time. Your
external time reference can in turn be synchronized to a GPS or whatever
higher order time reference you may want to use. The package, called
TCPtimesync, will ensure that your IA master time keeper tracks the external
reference and all adjustments to the IA time are made in a smooth way so
that there are no problems with your process or historians.
The only technical requirements for the external time reference are that it
runs the daytime/tcp or time/tcp protocol. If your external reference is a
UNIX box (for example Solaris) then this service is already present, if you
have an NT box, then installing the standard NT "Simple TCP Services" will
do it.
Generally the sites that worry about time synchronization implement a scheme
where there is a local time reference synced to an external source (GPS,
atomic clock, etc) and all the systems on site are synced to this local
reference.
More information is available upon request.
Sylvain.
Sylvain Nadeau
Systems Integration & IT
Invensys Process Systems
INVENSYS SYSTEMS CANADA INC.
snadeau@xxxxxxxxxx
514-421-8107
Fax:514-421-8054
-----Original Message-----
From: brad.s.wilson@xxxxxxxxxxxxxx [mailto:brad.s.wilson@xxxxxxxxxxxxxx]
Sent: October 27, 2003 11:11 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Daylight savings and OSI PI
I hate these 2 times of the year ... daylight saving time changes. Every
time I think I've fixed the problem, it resurfaces 6 months later.
We're running ver 4.3 with one ethernet port to OSI PI ver 3 (NT). The PI
data is showing flatline for the most recent hour and the data is updating
prior to that, so I know that PI & I/A are communicating. But the
timestamps are obviously off. A couple of things I'd like to correct ...
most immediately, to get the PI & I/A back in sync with each other ... the
second, to syncronize the clocks between the PI server and the I/A (and
hopefully our network IS servers, so users don't see a different PI time
from their PCs). The servers lose time relative to each other by about 30
minutes/year. Since I have no control over the network time, I'm probably
forced to use that as the standard.
Any help would be appreciated.
Brad Wilson
ExxonMobil Chemical Co
Edison Synthetics Plant
732-321-6115
732-321-6177 fax
Brad.S.Wilson@xxxxxxxxxxxxxx
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