User's Manual

Page 50
X75 SERIES - Mk3 Controller
INSTALLATION & OPERATING MANUAL
Manual No. x75mk3-11
x75-man-Rev11-0815.indd
administrator password is necessary for this change.
The label on the top right will update to show how long the log will run before
beginning to overwrite the earliest entry.
To display stored data, choose the start date/time of the period of interest using the
date spinner box (upper left in the graph control section). Then select a time span
from the upper right (choices are 1hr, 12 hrs, 24hr, 7 days, 30 days).
Next choose which parameter you would like to examine using the parameter
combo-box.
Finally, to display the data, click the REFRESH button at the bottom. This will also
load the latest data from the controller at this time. If no data is available the graph
will be blank.
The data in the controller is only saved to permanent memory once every hour. This
is because the permanent store is based on ash memory. Saving more often would
shorten the ash memory’s life, particularly for the more frequent logging times.
This means that under some circumstances (e.g. loss of power) recent data can be
lost as it is only in volatile memory. To force a save of the data to the permanent
store, click the FORCE SAVE button.
The controller will take steps to save data if it is aware of a pending power down.
It will also save the data in the permanent store before it opens the LVD, which is
the most common way that the controller will lose power.
A log entry always overwrites the oldest data.
The controller scans the data log at start up to work out the correct place in the log
to start writing.
If desired the data log can be completely erased. This might be useful after
commissioning or testing where the data is no longer needed. This can be
accomplished by clicking the CLEAR HISTORY button.
Log data is stored in 10 les in the le system in the html directory. The les are
named dataLogN.dat where N is a digit from 0 to 9. These les can be retrieved using
FTP. It is not recommended to delete these les using FTP. The le is formatted in
32 byte blocks. The format of each block is as follows: