GE DigitalFlow DF868, Руководство по программированию

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Foundation Fieldbus Communications D-1
March 2008
Optional Measurements
Foundation Fieldbus provides a means of communicating with the
flowmeter. The patent numbers which apply are 5,909,363 and
6,424,872.
This Foundation Fieldbus device supports 2 Analog Input (AI)
blocks, which can be configured to supply the following
measurements on the network (see Table D-1 below)..
Table D-1: Available Measurements for the DF868
Channel 1 Units Channel 2 Units Average Units
Ch1 Velocity ft/s or m/s* Ch2 Velocity ft/s or m/s* Avg Velocity ft/s or m/s*
Ch1 Act Volumetric VOL_U Ch2 Act Volumetric VOL_U Avg Act Volumetric VOL_U
Ch1 Std Volumetric VOL_U Ch2 Std Volumetric VOL_U Avg Std Volumetric VOL_U
Ch1 Fwd Totals TOT_U Ch2 Fwd Totals TOT_U Avg Fwd Totals TOT_U
Ch1 Rev Totals TOT_U Ch2 Rev Totals TOT_U Avg Rev Totals TOT_U
Ch1 #Tot Digits** none Ch2 #Tot Digits** none Avg #Tot Digits none
Ch1 Mass Flow MASS_U Ch2 Mass Flow MASS_U Avg Mass Flow MASS_U
Ch1 Fwd Mass Totals
MTOT_U
Ch2 Fwd Mass Totals
MTOT_U Avg Fwd Mass Totals MTOT_U
Ch1 Rev Mass Totals MTOT_U Ch2 Rev Mass Totals MTOT_U Avg Rev Mass Totals MTOT_U
Ch1 #Mass Tot Digits
none
Ch2 #Mass Tot Digits
none Avg #Mass Tot Digits none
Ch1 Timer sec Ch2 Timer sec Avg Timer sec
Ch1 Error Code none Ch2 Error Code none Avg Error Code none
Ch1 SSUP none Ch2 SSUP none Avg SSUP none
Ch1 SSDN none Ch2 SSDN none Avg SSDN none
Ch1 Sound Speed ft/s or m/s* Ch2 Sound Speed ft/s or m/s* Avg Sound Speed ft/s or m/s*
Ch1 Density*** see note Ch2 Density*** see note
Ch1 Temperature Deg F or C* Ch2 Temperature Deg F or C*
Ch1 Pressure PRESS_U Ch2 Pressure PRESS_U
*Metric or English units are determined by the setup of the flowmeter.
**Totalizer digits are available for informational purposes only. Respective totals are automatically scaled
by the Tot Digits value selected in the flowmeter setup.
***If the meter is outputting Mole Weight, the unit is “mw”, otherwise it is the programmed pressure unit.
VOL_U, TOT_U, MASS_U, MTOT_U and PRESS_U are determined by the units chosen for these measure-
ments in the flowmeter setup. See the instrument User's Manual for the setup of these parameters.