Carbolite nanodac - Manual (Page 61)

nanodac™
59
MC27 –EN–1.04
5.2.2 Group Recording configuration
Similar to Trend configuration, above, but for saving the data to Flash memory history files. Each point
can individually be enabled or disabled for recording, or recording can be disabled for the whole group.
Figure 2.3.2 shows a typical page.
Figure 2.3.2 Group trend recording configuration
Flash Size Read only. Shows the size of the Flash memory fitted in MB.
Flash Duration Read only. Shows the time it will take to fill the Flash memory if the recorder
configuration remains unchanged.
Enable ‘Yes’ enables group recording so that all points set to ‘Yes’ are stored in the
recorder’s flash memory. ‘No’ disables group recording.
Interval Defines the rate at which data is saved to the recorder’s Flash memory. The value
affects how much trace history appears on the screen in trend history mode.
UHH Compression Select ‘Normal’ or ‘High’. ‘Normal’ compresses the data, but still provides an exact
copy. ‘High’ compresses more, but values are saved only to 1 part in 10
8
resolution.
See also note 1, below.
Channel 1 to VirtualChan 30 (see note 2, below)
Read only (greyed ‘yes’) for points being trended, (these are automatically
recorded). For non-trending points the user may enable or disable each point
individually.
Suspend Ignored unless the user has wired to this field. If wired then when set to 'No'
recording is active, when set to 'Yes' recording is paused.
Notes:
1. Where very high values are involved, such as in some totaliser values, ‘High’ compression may
cause the value displayed at the recorder, and held in the history file, to be incorrect. The
problem may be resolved by changing to ‘Normal’ compression, or, in the case of a totaliser,
by re-scaling it (for example from MegaWatt hours to TeraWatt hours).
2. Virtual channels 1 to 15 are included in the standard build. Channels 16 to 30 are included only
if the Modbus Master and / or EtherNet/IP option is fitted.
Flash Size
Flash Duration
Enable
Interval
UHH Compression
Channel 1
Channel 2
Group.Recording
50.00 MB
17.06
Days
Yes
1 sec
Normal
Yes
Yes
Channel 3
Channel 4
VirtualChan 1
VirtualChan 2
Yes
Yes
Yes
No
VirtualChan 30
Suspend
No
No