Hi Jim,
We have a product that 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.
Our 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
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 wary 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.
Regards,
Alex Dumitru
System Integration & IT
[EMAIL PROTECTED]
Tel.: (514) 421-8073
on-net: 796-8073
> -----Original Message-----
> From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, April 24, 2001 9:16 AM
> To: [EMAIL PROTECTED]
> Subject: Daylight Savings and Time Synching
>
>
> Here in Indiana we avoid the issue by never shifting any of our
> clocks. Like Foxboro, corn, beans and livestock are very
> sensitive to shifts in time.
>
> I do have another time question...
>
> Has anyone either modified the xntp daemon for Solaris to serve
> the Foxboro time to PCs? Or, has anyone modified the client ntp
> software to work with a Foxboro/GMT time server? If you simply
> use the server and client software without modification all your
> machines show time as assuming the server is at GMT. If you set
> PCs to GMT it creates problems for email and other software such
> as Aspen Tech client software. Ideally, I'd like to have a
> modified ntp server on an AW51, that would allow me to specify a
> TZ shift to account for Foxboro preference of TZ=0. This would
> allow our processing areas to synchronize PC clocks so that
> events recorded on all protocols can use a consistent timestamp.
> provided by the DCS.
>
> It's also very possible that I simply don't understand all the
> available options, and the ntp software can be configured to
> function the way I desire.
>
> Thanks in advance for any help you can provide.
>
> Jim Murphy
> ==========
> Senior Process Control Engineer
> Eli Lilly and Company
> Phone: (317) 276-6859
> Email: [EMAIL PROTECTED]
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