User Manual, Firmware rev. 3.0 or LATER Owner's manual

150 Publication 1404-UM001F-EN-P - November 2009
Chapter 7 Data Logging
Parameters per Record Formula
If your application requires a certain number of records or time to
preserve logged information, this formula returns the number of
parameters per record allowed.
Where:
CEIL (x) = the smallest integer greater than x.
Examples
Example 1: You want to log kWh every 15 minutes and you want to
know how many records the log contains and how long a time that
covers. The Trend Log Depth Formula
applies to this example.
Fill and hold mode allows logging the most records. Logging only 1
parameter per record, the formula results in a total of 17,640 records
after rounding down. Logging every 15 minutes, this log configuration
will log 6.1 months of kW data.
EXAMPLE
For example, CEIL (1914.28) = 1915.
Suppose D = 13400 and F = 0, we will get
Suppose D = 13500 and F = 0, we will get
PINT
16384
CEIL
D
7 F–
------------
⎝⎠
⎛⎞
-------------------------------- 5 . 5–
⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎛⎞
=
PINT
16384
CEIL 1914.28()
-------------------------------------- 5 . 5–
⎝⎠
⎛⎞
INT 3.05()3===
PINT
16384
CEIL 1928.57()
-------------------------------------- 5 . 5–
⎝⎠
⎛⎞
INT 2.99()2===