Appendix E. Foundation Fieldbus Communications; Introduction - GE DigitalFlow XGS868i Programming Manual

Appendix E. Foundation Fieldbus Communications

E.1 Introduction
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 6 Analog Input (AI) blocks, which can be configured to supply the following
measurements on the network (see Table 32).
Channel 1
Ch1 Velocity
Ch1 Act Volumetric
Ch1 Std Volumetric
Ch1 Fwd Totals
Ch1 Rev Totals
Ch1 #Tot Digits**
Ch1 Mass Flow
Ch1 Fwd Mass Totals
Ch1 Rev Mass Totals
Ch1 #Mass Tot Digits
Ch1 Timer
Ch1 Error Code
Ch1 SSUP
Ch1 SSDN
Ch1 Sound Speed
Ch1 Density***
Ch1 Temperature
Ch1 Pressure
*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.
DigitalFlow™ XGS868i Programming Manual
Table 32: Available Measurements for the XGS868i
Units Channel 2
ft/s or m/s* Ch2 Velocity
VOL_U Ch2 Act Volumetric
VOL_U Ch2 Std Volumetric
TOT_U Ch2 Fwd Totals
TOT_U Ch2 Rev Totals
none Ch2 #Tot Digits**
MASS_U Ch2 Mass Flow
MTOT_U
Ch2 Fwd Mass Totals
MTOT_U
Ch2 Rev Mass Totals
none
Ch2 #Mass Tot Digits
sec Ch2 Timer
none Ch2 Error Code
none Ch2 SSUP
none Ch2 SSDN
ft/s or m/s* Ch2 Sound Speed
see note Ch2 Density***
Deg F or C* Ch2 Temperature
PRESS_U Ch2 Pressure
Appendix E. Foundation Fieldbus Communications
Units Average
ft/s or m/s* Avg Velocity
VOL_U Avg Act Volumetric
VOL_U Avg Std Volumetric
TOT_U Avg Fwd Totals
TOT_U Avg Rev Totals
none Avg #Tot Digits
MASS_U Avg Mass Flow
MTOT_U
Avg Fwd Mass Totals
MTOT_U
Avg Rev Mass Totals
none
Avg #Mass Tot Digits
sec Avg Timer
none Avg Error Code
none Avg SSUP
none Avg SSDN
ft/s or m/s* Avg Sound Speed
see note
Deg F or C*
PRESS_U
Units
ft/s or m/s*
VOL_U
VOL_U
TOT_U
TOT_U
none
MASS_U
MTOT_U
MTOT_U
none
sec
none
none
none
ft/s or m/s*
143