Emerson Rosemount 3051S Series - Engineering Assistant installation; System requirements; Install Rosemount 3051 SMV Engineering Assistant

19
Manual Supplement
00809-0200-4853, Rev AB
Rosemount 3051S Series Pressure Transmitter
November 2017
Rosemount 3051S Series Pressure Transmitter
Figure 9. Example AI Function Block for Trending Standard Deviation in DeltaV
Set the units and scaling for the function block as desired:
XD_SCALE = 0 to 1 in H
2
O (68 °F)
OUT_SCALE = 0 to 1 in H
2
O (68 °F)
L_TYPE = Indirect
Note that the range set in the OUT_SCALE parameter will be the range shown by default when the
variable is trended in the DeltaV Process History View. Standard deviation typically has a range much
narrower than the process measurement, so the scaling should be set accordingly. Also note that the
units for XD_SCALE must be set to in H
2
O (68 °F), but the units for OUT_SCALE can be set to any desired
engineering unit.
If the standard deviation is to be logged to DeltaV Continuous Historian, the appropriate parameter
must be added to the historian. Right click on the OUT parameter of the AI Block, and select Add History
Recorder … (Figure 10).
Figure 10. Adding History Recorder from DeltaV Control Studio
Follow through the Add History Collection dialog (Figure 11), to add the parameter to the DeltaV Historian
with the desired sampling period, compression, etc. By default the sampling period is 60 seconds, as
shown in Figure 11. However, there are many diagnostics applications where one may want to look at
changes in the standard deviation much faster than this. In that case, you will want to set the sampling
period to a shorter duration.