This probably won't address Joseph's question but I will share some
time-related knowledge.
We have a utility from Invensys Montreal called TCPtimesync aka I/A Timesync. I
am not sure if this is a cousin of NTP Timesync. Features:
- Allows Fox Master Timekeeper to be synced with an external source (eg
"business LAN" time through a firewall)
- Can generate an alarm if Fox time is out of sync with external source
- Designed to effect "small and gradual [time] adjustments to the MTK so as to
prevent the upset of I/A components that are sensitive to timing"
- Optional feature that, when enabled, adjusts to DST by shifting the MTK time
forwards or backward, seconds at a time over a 20-hour timespan. To avoid
one-hour history gaps or overlaps.
We had issues with our Wonderware Historian rejecting history values from our
Fox I/A system because the clocks drifted. This time of year I am happy to be
in Saskatchewan where we don't adjust our clocks.
Brahm
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Landry, Scott
Sent: Friday, November 06, 2015 7:19 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] WinNT V6.4 time change DST
Daylight Savings Time
Both the I/A Series and NTP do not support automatically adjusting for Daylight
Savings Time.
If you wish to use Daylight Savings time, make sure your time source is
adjusted for Daylight Savings. When the time source moves ahead or back 1 hour
the NTP software will stop updating the host because they will be out of sync
by more than 1000 seconds, as described above. To start the NTP TimeSync again,
you must manually set I/A or the PC to be within 1000 seconds of the Daylight
Savings time adjusted time source.
CAUTION: When setting the I/A Series clock back by 1 hour the system may be
unusable for the next hour. Please see the standard I/A Series documentation
for more information on this subject.
________________________________________
From: foxboro-bounce@xxxxxxxxxxxxx [foxboro-bounce@xxxxxxxxxxxxx] On Behalf Of
Joseph M. Riccardi [Joe@xxxxxxxxxxxxx]
Sent: Thursday, November 05, 2015 4:42 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] WinNT V6.4 time change DST
Folks,
I am following an old procedure to change time on this WinNT system and after
"Return - Set" the instructions are:
* Modify the file .\TZOffset to contain the seconds from between the
time local (Pacific Time) time zone maintained on the NTP TimeSynch program.
The file contains 28,800 (UTC -8:00). Why would this change?
* Reboot to reset the NTP TimeSync program. Really? Why if the file
doesn't change?
Not familiar with the NTP TimeSync program sooooooo before I experiment on the
Production System.
Joseph M. Riccardi
386-451-7607 Cell
Joe@xxxxxxxxxxxxx <mailto:Joe@xxxxxxxxxxxxx>
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