Omron NT31 Series, Operation Manuals

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401
Graphs
Section 7-10
The background function allows data to be sampled even while the trend graph
is not displayed.
Usually, with trend graphs, data is only sampled while the graph is displayed and
sampling is stopped when the screen is switched. By using the background
function, sampling can be carried out even while the trend graph is not being dis-
played. The recorded data is displayed by back tracking when the trend graph is
displayed.
The background function can only be used in conjunction with the data logging
function, and the only data recorded is that for the data logging function. Howev-
er, since sampling continues while the background function is being used, the
processing of the NT31/NT31C may be delayed.
Reference: The retention of data by the data logging function remains effective until any of the
following operations is performed.
- The power to the NT31/NT31C is turned OFF.
- The NT31/NT31C is reset.
- All the screen data is transmitted.
- Data is transmitted in screen units.
When operation is stopped, for example by displaying the System Menu, sam-
pling is also stopped even if the background function is being used; it is restarted
when operation is restarted (the data is retained and recording starts from the
data following the last data).
Data is recorded as described below depending on whether or not the data log-
ging function and background function are used.
<When neither the data logging function or background function is used>
Data logging not performed
Trend graph screen
Screen
switching
Other screen
Return
Trend graph screen
(trend graph drawing restarts)
<When the data logging function is used and the background function is not
used>
Data logging
performed
Trend graph screen
Screen
switching
Other screen
Return
Trend graph screen
Data logging
performed
No data logging during this period