100 MM GRAPHICS RECORDER: USER GUIDE
HA027271
Issue 12 Mar 04
User Guide
Page 46
4.3.2 GROUP CONFIGURATION (Cont.)
RECORDING ENABLE
This tick box allows the logging of this group's data to the Flash memory to be enabled or disabled.
When disabled:
a
The Recording speed/interval fields, described below, do not appear.
b
Display trends are not preserved when changing 'Views'.
Note: If one or more Recording Jobs (
) are set to act on a group, then the group will be recorded
only whilst the job is active, and only if Recording is enabled for the group.
RECORDING SPEED/RECORDING INTERVAL
If Recording is enabled, these fields are as for trend speed/interval but define the rate at which data is saved to Flash
memory. This value also affects how much trace history appears per screen height in trend history mode (
). If recording is not enabled, these fields do not appear.
is enabled, a second Recording Speed /Interval value can be entered. Recording Speed/Interval 'A' is
used during normal operation. Recording Speed/Interval 'B' is switched to by job action, as described in
TREND HISTORY DURATION
Gives an estimated time to fill the group's trend history area of the Flash memory. The calculation is based on the
archive rate, the compression ratio, the flash size and on the exact nature of the data. (Rapidly changing values use
more space than static/slowly changing values.)
For recorders with two groups, changing the contents of one group may affect the Trend History Duration of the other
group. This happens because the recorder attempts to store, as nearly as possible, the same amount of history for both
groups, regardless of how many points there are in each group.
For an 'empty' group, the Trend History Duration is displayed as '0' Days
ARCHIVE TO MEDIA/ARCHIVE VIA FTP
If Recording is enabled, these tick boxes allow the archiving of this group's data to removable mass storage media
(e.g. floppy disk) and to a remote host (FTP) to be enabled or disabled. If recording is not enabled, these tick boxes do
not appear.
Note: For recorders with two groups, it is recommended that only one group be set up for automatic archiv-
ing. This is because history files are typically 400kB in size, and this limits the number of files that can be
saved, to a 1.4MB floppy disk, to three. If more than one group is set up to archive, and if 'Overwrite' strat-
egy is selected, then it is likely that data for one of the groups will be lost. If an attempt is made to set up
more than one group for archiving, the following message appears:
'Not recommended to archive more than 1 group to floppy disk due to limited space - see manual'
ALARM MESSAGE
This box allows the printing of alarm on and off messages on the 'chart' to be enabled (cross) or disabled (no cross) as
required. Alarm messages appear on the trend display and in PC Review in the form HH:MM:SS Alarm ON n/m and
HH:MM:SS Alarm OFF n/m, where 'n' is the relevant channel number and 'm' is the alarm number (1 or 2).