Emerson Rosemount 3490 Series Reference Manual page 86

Getting started
January 2021
Table 4-5: Data Logging Parameters
Parameter
P590
P591
P592
P593
Related information
Data logging screens
Starting, stopping and resetting the logger
Using the logging wizard for data logging of level measurements
Using the logging wizard for data logging of flow measurements
86
Description
Log Interval The logging interval is the period over which the
parameter-to-be-logged is sampled every five
seconds and then averaged at the end. The averaged
value is then logged.
An interval value of 15 minutes logs the averaged
value at 15-minute intervals, which equates to 50
days elapsed time.
Fast Log (Fast If the parameter-to-be-logged value is higher than a
log mode) user-entered value (P591), the 3493 automatically
moves to a fast log mode.
The parameter-to-be-logged is then logged once
every minute until the logged value is less than P591.
Fast logged values are tagged for easy identification
when examining logged data.
Data Overwrite After the logging memory is full, there is a choice to
continue data logging and overwrite the oldest data
(On) or to stop data logging (Off).
Low Mem Alarm An alarm can be raised to indicate when the unused
memory falls to below a user-defined percentage
(P593). See
indicated by a relay output, driving the output
current to a set level, or both.
When the memory is full, logged data is either
overwritten or the data logging stops, as determined
by parameter P592.
Parameter D846 shows the percentage of free
memory remaining for data logging.
Set-up alarms for selecting if this alarm is
Reference Manual
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Default
15 minutes
0
On
0%
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