Alpha Technologies Cordex Controller Ver.2.0 - Manual (Page 73)

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Log Frequency – determines how often the data is collected. The default time interval is 60
seconds and the range is from ten to 86,400 seconds (24 hours). An interval may also be set
based upon when a selected signal changes by the Delta Level; click on the value to edit.
Figure 64–Log Frequency (web interface) window to enable time interval
Figure 65–Log Frequency (web interface) window to enable signal interval
Start Trigger – enables data collection to be started manually, by event or by time. For
example, select Customize to edit/build an equation from the list of operands (alarms and
signals) and operators (arithmetic and logic):
Figure 66–Alarm Equation web interface window
Stop Trigger – enables data collection to be stopped manually, by event or by time. For
example, to specify a period of time when data collection is allowed, select Duration and click
on the values (Hrs, Min, Sec) to configure.
NOTE: After configuring a Data Log, select Submit Changes to accept (save) the changes.
6.6.3.2 Starting/Stopping Data Logging
To activate the log file, press the “Start” button at the top of the Configure Data Logging page
(next to File Information). A message window will prompt to start logging data for the selected
file. Under Data Log Files, displayed next to the log filename, the number of records will
increase. Under File Information, the status will indicate the log file is running.
To discontinue logging, press the “Stop” button; status will change to stopped.
“Delete” the log file to clear the configuration and data.
Mathematical operators:
+ = Add
- = Subtract
* = Multiply
/ = Divide
Logical operators:
& = AND
| = OR
! = NOT TRUE
= is EQUAL TO (compare for equality)
< is LESS THAN
> is GREATER THAN
( is OPEN PARENTHESIS (used with a
close parenthesis to set apart arguments to
a mathematical function)
) is CLOSE PARENTHESIS (see open
parenthesis; used to clarify the order of
operations)