To set the time zone on an
historical data source
The time shown for a selected historical data item is based on
the selected time zone. By default, this zone is set to the time
zone of your display (as it is set on the Current Display Settings
dialog box). However, you can configure the time zone by selecting
a different zone from the Time Zone field, such as the time zone of
the server.
By configuring the time zone, it becomes easier to collaborate
with others around the world. For example, if you work in Seattle
(Pacific time zone) and your colleagues work in Atlanta (Eastern
time zone), you can adjust the time zone of your chart to match
theirs.
In addition to these standard time zones, Proficy Portal allows
you to select the following time zones:
Time Zones Properties
|
Property
|
Description
|
|
Client Time Zone
|
The time zone of the local client computer
(not the server machine).
|
|
Display Time Criteria Time Zone
|
Uses the time zone specified in the display
(set on the Current Display Settings dialog box).
|
|
Data Server Time Zone
|
For Historian, this is the server's time
zone. For CIMPLICITY Logger, this is the Proficy Portal server's
time zone.
|
|
Tag Time Zone
|
defines the time zone of a data source item.
This time zone includes a Greenwich Mean Time (GMT) offset (called
a Time Zone Bias in Historian) if one is configured for the data
source item. By default, the GMT offset in Historian is 0.
When a Historian time zone bias does not
correspond to the offset of a known time zone, Proficy Portal uses
a time zone/offset of GMT+00:00. For example, if the time zone bias
for a tag in Historian is set to 450 minutes, when the tag is
plotted in a Time chart, and the iHistorian data source is
configured to use the tag time zone, the chart will use an offset
of GMT+00:00. Short/Long Time Zone legend items (if they are set to
display on the chart) are displayed as `GMT+00:00'.
NOTE: You can also
configure time zones when you create a datalink. Using the Tag time
zone with a datalink requires you to set the Time Zone Bias in
Historian; otherwise, the datalink displays the Greenwich Mean Time
offset as 0.
|
In time and event charts, each pen has its own time zone. In an
XY chart, only the X axis pen has a time zone; Y axis pens use the
time span and time zone of the X axis pen. Consequently, you can
configure only one time zone for the XY chart.
When two or more historical sources are used in expressions, and
the time zone of one or more sources is changed, the time zone will
automatically be changed to the default time zone.
See Also
