Xl™ series – Xylem XL Series H-522 - Plus User Manual

Page 154

15-10 Logging Options

XL™ Series

This will add up all the values scanned for this column since scanning was enabled and log a the
value at each log interval.

Alwys:
There are a few reasons to use this option. First lets assume the scan rate is set to a rate faster
than the log rate for a specific log column. If the log column is also used as a status screen then
it may be desirable to update more often so the value originally displayed on the status screen is
more recent. Pressing the Enter key will also cause the status screen to update so this may not be
as important.

The second reason to measure every scan even if the value will not be logged every scan is to
provide an updated value for other processes that happen more often. The following Logging
Options segment shows column 3 to be logged every hour but the function Alwys is used so it is
measured each scan. Now look at column 4 that uses a function as a source and is logged every
15 minutes, equal to the scan rate. If the function uses the stage value as part of its calculation
then it will be using a fresh stage value each scan. If column 3 function was set to Now, meaning
scan and log only as needed and in this case once an hour, then the function in column 4 would
use the same stage value measured at the top of the hour for its 15 minute, 30 minute and 45
minute scan.

Logging Options (Esc to Return)

Scan Rate = 00:15:00 Est. Days To Fill Memory: 213

Alwys NOW NOW

U - Stat Scrn| No No Yes Yes Yes

This manual is related to the following products:

XL Series H-522 XL Series H-510XL XL Series H-500XL XL Series H-350XL