Eurotherm 6100, User Manual

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100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
Page 78 HA029324
Issue 11 Oct 14
4.3.5 ARCHIVE CONFIGURATION (Cont.)
COMPRESSION
Select Normal or High compression. ‘Normal’ compresses the data but still provides an exact copy.
‘High’ compresses more, but channel values are saved only to 1 part in 10
8
resolution. This fi eld does not
appear if ‘CSV’ is selected as fi le format (see below).
Note: Where very high values are involved (e.g. some totaliser values) ‘High’ compression may
cause the value displayed by the recorder, and held in the history fi le, to be incorrect. This prob-
lem may be solved by moving the relevant point to a group using ‘Normal’ compression, or by
re-scaling the totaliser to read (for example) TeraWatt hours instead of Megawatt hours.
FLASH SIZE
Allows the size of the internal fl ash memory to be viewed by the user.
SHORTEST TREND HISTORY / DURATION
This shows which group has the shortest amount of Flash memory allocated to its history record. Provid-
ing the archive period is less than the value displayed in the Duration window, no data will be lost from
any group. If the archive period is greater than this value, then some of the data in one or more groups
will have been overwritten and therefore lost.
If there is more than one group with the same Shortest Trend History Duration, the group with the lowest
number is displayed. (E.G. If groups two and four both have the same duration, ‘Group 2’ will appear in
this window.)
Note: Trend history duration depends on many factors, as described in Group Confi guration ( sec-
tion 4.3.2 ) above.
CSV CHECK BOXES, DATE/TIME FORMAT
These appear only if the ‘Media File Format’ or ‘FTP fi le format’ are set to either ‘CSV’ or ‘Binary and CSV’.
Refer to ‘
CSV Files ’ at the end of this subsection (4.3.5).
SHOW
This allows the fi elds which are to appear below ‘Show’ to be applicable to the local memory device (Lo-
cal Settings), or to the setting up of a remote host path for archiving purposes (Remote settings). The
following descriptions contain all the fi elds which may appear in either menu.
MEDIA
For ‘Local’ setting only
For standard recorders, this allows ‘mediacard or ‘usbfront’’ to be selected as the local archive destina-
tion. The USB port supports fl oppy disk drives and ‘memory sticks’.
ARCHIVE TO MEDIA
For ‘Local’ setting only:
None
Archive must be initiated by the operator ( section 4.1 )
Hourly Archive occurs on the hour every hour
Daily Archive occurs at 00:00* hrs each day
Weekly Archive occurs at 00:00* hrs every Monday
Monthly Archive occurs at 00:00* hrs on the 1st of each month
Automatic The recorder selects the least frequent archive period (Hourly, Daily, Weekly, Monthly),
which is guaranteed not to lose data as a result of either the internal Flash, or the local
memory device, running out of space (calculated assuming that the memory device is
initially ‘empty’). When Automatic is selected, a further, non-editable menu item ap-
pears, showing which of the archive frequencies has been selected.
*Note: Archive times are not adjusted for Daylight Saving hour changes. Thus if the archive is set
to ‘daily’, ‘weekly’ or ‘ monthly’ then, during ‘Summer Time’, the archive will occur an hour late (i.e.
at 01:00 hrs. instead of midnight).
If the recorder has been powered
down prior to archive time, the ar-
chive takes place the next time the
unit is powered up.