100/180 MM GRAPHICS RECORDER: USER GUIDE
HA261742
Issue 16 Nov 04
User Guide
Page 60
4.3.2 GROUP CONFIGURATION (Cont.)
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.
If
A/B switching
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.) If
A/B switching
is enabled the calculation is based on Recording
Speed/Interval 'A'.
For recorders with more than one group, changing the contents of one group may affect the Trend History Duration of
other groups. This happens because the recorder attempts to store, as nearly as possible, the same amount of history
for all groups, regardless of how many points there are in the groups. For 'empty' groups, 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 disabled, these fields do not appear.
Note: For recorders with Multiple Groups and floppy disk drives only, it is recommended that only one group
be set up for automatic archiving. This is because history files are typically 400kB in size and this limits the
number of files which can be saved to a 1.4MB floppy disk, to three. If more than one group is set up to
archive, and if 'Overwrite' strategy is selected, then it is likely that all the data for one or more of the groups
will be lost. If an attempt is made to setup 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).
ACK MESSAGE
This tick box allows the printing of alarm acknowledgement messages on the 'chart' to be enabled (tick) or disabled
(no tick) as required. Acknowledge messages appear on the trend display and in PC Review in the form HH:MM:SS
ALARM ACKNOWLEDGE
Alarms are acknowledged as described in
.
GROUP CONTENTS
This appears as a number of tick-boxes, to include the ticked items in, or to exclude non-ticked items from, the group,
as required. Each group may contain any or all of the measuring channels, maths channels and totalisers (if fitted),
but only the first 36 will be displayed.
Note: If a configuration has been generated on a recorder version 1.2 or later, and this configuration has been
'restored' into a version 1.1 recorder, a message "Invalid item" appears on entering group configuration unless
an auto-configuration (
) has been carried out since the Restore operation. Operation of the
"OK" key clears the message, and the recorder operates as normal.
