Siemens DESIGO PXM20 User Manual page 53

Note The flashing symbol at the beginning of the line in the Online Trend
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The individual parameters have the following meanings:
On / Off
Here, you should define the length of time over which the trend
values are to be logged.
Enter the sampling rate (logging interval) in days, hours, minutes
and seconds.
A logging interval of 0 results in COV logging (Change of Value).
Define here what should happen to the trend logging when the
memory limits are reached.
If you select No, the first values will be overwritten by new values.
With Yes, trend logging will stop.
Number of values that can be stored
Delete all logged values
Number of sampled values in the current trend log
SAVE TREND SETTINGS lets you save your inputs, after which the
PXM20 will start logging these values. The display reverts to the
main dialog box.
dialog box (Figure 10-2) indicates that trend logging is actually in
progress. If Log enable is set to On, but the symbol is not flashing
despite this, you should check your settings (start time, stop time and
referenced data point).
You can display the trend data in three different views, as described
in the next section.
PXM20 / PXM20-E operator unit
Trend function and settings
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CM110754en_02
17 Dec 2009