VEGA RS232_Ethernet connection - Manual (Page 59)

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12 Device trend/Data logger (only VEGAMET/VEGASCAN)
RS232/Ethernet connection • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62
30325-EN-130701
12 Device trend/Data logger (only VEGAMET/
VEGASCAN)
12.1 General information
With the device recording the measured values of a VEGA instrument
can be monitored. There are two options for trend recording:
The data are saved over a certain period in the VEGA instrument
and can be read out again later on. Via PACTware and DTM different
recording conditions can be set and the process can be started or
stopped. The max. recording period is limited by the memory of the
signal conditioning instrument. The max. recording period differs de-
pending on the recording type (interval or measured value difference).
When recording with interval, a maximum of 200 000 measured val-
ues can be recorded, when recording with measured value difference,
the maximum is reduced to 140 000. If a measured value is saved
every minute, a period of e.g. 138 days results (with measured value
difference). If more than one curve is recorded, this period is reduced
accordingly.
Note:
The recorded data are written in a period of two to five minutes from
the internal RAM to a flash disk. In case of voltage failure, recordings
of the last minutes can get lost.
The data are only saved on the PC during an online connection with
PACTware and DTM. The max. recording period is limited only by the
storage space on the hard disc.
12.2 Setting of the device trend
The settings are carried out in the DTM under the menu item "Diag-
nostics - Device trend - Settings". Depending on the device, up to 15
curves are available (3x with VEGAMET or 15x with VEGASCAN). If
required, these curves are activated or deactivated/deleted on this
side. By pushing the button "Add", an installation assistant for creating
the selected curve is started. The following settings are carried out
step-by-step:
In the first step you have to select the requested measurement loop
and the measured value.
Here you set the requested recording interval. The following options
are possible:
•
"In time interval": Recording is carried out in certain adjustable
time intervals
•
"With measured value difference": Recording is carried out meas-
ured value dependent with adjustable measured value difference
A combination of the two recording modes is also possible.
Device trend
DTM trend
Measurement loop/Meas-
ured value
Recording mode