Honeywell Centraline FALCON, User Manual, Page: 229 / 276

USER GUIDE FALCON
225 EN2Z-0962GE51 R0715
Based on the default log interval for time-based trending (1 minute)
and the max. no. of trend log objects (125), a maximum of 2 trend
records per second can be created:
125/60 = 2 (limiting factor)
For value-based trending, the default log interval should be estimated
roughly by noting the no. of value changes which occurred within an
appropriate time period.
Any calculations should result in a limiting factor of less than 2 (trend
records per second).
Example:
You have a trend setting of 40 trend log objects with 1 trend record per
minute plus 20 trend log objects with 1 trend record per 2 minutes.
The result is an addition of the values as follows:
40/60 + 20/120 = 0.833 => less than 2
Trending Start / Stop Date and Time
Here you can define the time range (start and stop date/time) of the trending.
To define the time range, do the following:
xx. Click the Start Date checkbox and enter the start date into the fields or
select date by clicking the BROWSE button.
yy. In the Time fields enter the time.
NOTE:
If the checkbox is unchecked, the fields are disabled. This means, that trending
will be performed up to and including the end date.
zz. Click the Stop Date checkbox and enter the end date into the fields or
select date by clicking the BROWSE button.
aaa. In the Time fields enter the time
NOTE:
If the checkbox is unchecked, the fields are disabled. This means, that trending
will be performed from the start date on.
NOTE:
If both fields are disabled, trending will start immediately and continues all the
time.
If clicking the ENABLE LOGGING button enables the trend logging, the trending
starts as soon as the start date/time is reached and ends at stop date/time.
During trending the status is active as indicated as checked Active.
Stop of Trending is done by clicking the DISABLE LOGGING button (Status:
Enabled=unchecked, Active=unchecked).
Trend Buffer Settings
Here you can define the trend buffer settings and clear the buffer.
Under Entries in Buffer , the current number of records is displayed.
Under Buffer Size , the max. buffer size can be set (trend logging must be
disabled).
bbb. Enter buffer size.
NOTE: The internal flash memory (2 MB) is capable of storing a maximum
of 64,000 trend records distributed among a max. of 125 trend log
objects. Each trend record allocates 30 bytes of memory. Based upon
the internal flash storage selection, the default value for the max.
buffer size is 2880 records, distributed among 24 trend log objects
according to the calculation: