Super Systems 9205 Series - Manual (Page 22)

Series 9205 Operations Manual Rev A 21
Data Logging using Flash Card
NOTE: See Warnings with respect to removing the Flash Card.
The Advantech TPC-642S/642-SE touch screen Operator Interface utilizing a Compact Flash
Card allows the unit to data log the parameters set up by a qualified SSi technician. Should a
customer not take the data offline in a timely manner, the data will be over-written, the oldest data being
over-written first. Here is how it works:
1. When the Operator Interface detects that there is less than 5% disk space left on the compact flash
card, an alarm will be displayed on the main interface screen stating "x% disk space remaining (overwrite
at 3%)". In the upper right corner, an ALM is indicated, but because it is not a communications alarm or a
9205 device alarm, the background remains green. This alarm will remain active until more than 5% of
disk space is available for writing data log files.
2. If the user does not copy the log data from the disk, it will eventually fall to 2% disk space. At this point,
the touch screen will select the oldest compressed file and delete it. It then checks to see if 3% remains. It
repeats this procedure until 3% disk space remains. At this point the alarm message changes to
"Overwriting data log data!” Because this allows the system to seesaw between 2% and 3%, it will continue
to display "Overwriting data log data!" until somebody offloads the files.
Technical concerns and details:
1. If there are not enough compressed files to bring the free space up to 3%, the system will hunt down and
kill hourly files. This should only happen if compression would not be running for some reason.
2. If all compressed files and hourly files have been removed and there is still not enough disk space
(perhaps a problem with the compact flash card), the data logger will not write to the disk until the
condition is remedied. (Alarms continue to display).
3. The data log data alarm is the lowest priority. The alarm priorities are touch screen communications,
then 9205 controller/programmer, then disk space.
See the Flash Card Management Section for more information.
!