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System-10-LON Network Interface Installation Guide 07/13 - 0654-4 / 16751 Page A-4
In order to prevent the loss of data nvoMegaBTU1i and/or nvoMegaBTU2i must be reset before the
accumulated value exceeds 65,535 MBtu.
A second variable is available for energy totals. It is kBtu. This variable will roll over to zero whenever
the accumulated value exceeds 65,535 kBtu. This variable has been provided to accommodate small pipe
applications where MBtu is not appropriate. The two energy variables (MBtu and KBtu) can be combined
to produce a total with resolution to 1000 Btu (1kBtu). Programming for this calculation is given below.
Integer Output Network Variables
Description Variable Name SNVT Name Engineering Units Valid Range
* Flow (volume) total -1 nvoVol1Li SNVT_vol Liters 0 to 65535
Flow (volume) total -1 nvoVol1KLi SNVT_vol KLiters 0 to 6553.5
* Flow (volume) total -2 nvoVol2Li SNVT_vol Liters 0 to 65535
Flow (volume) total -2 nvoVol2KLi SNVT_vol KLiters 0 to 6553.5
Energy total -1 nvoKiloBTU1i SNVT_btu_kilo KBtu 0 to 65535
Energy total -1 nvoMegaBTU1i SNVT_btu_mega MBtu 0 to 65535
Energy total -2 nvoKiloBTU2i SNVT_btu_kilo KBtu 0 to 65535
Energy total -2 nvoMegaBTU2i SNVT_btu_mega MBtu 0 to 65535
* Special small pipe volume total variables
Totalizing Using Both the MBtu and KBtu Variables Combined
MBtu (Btu x 1,000,000) is value in nvoMegaBTU1i (or nvoMegaBTU2i)
KBtu (Btu x 1,000,000) is value in nvoKiloBTU1i (or nvoKiloBTU2i)
Combined total = MBtu x 1000 + X
Where X = KBtu - [int (KBtu/1000) x 1000]
Example:
nvoMEGABTU1i present value = 4006 MBtu
nvoKILOBTU!i present value = 6200 KBtu
Combined total = (4006 x 1000) + (6200 - [int(6200/1000) x 1000])
Combined total = 4006000 + (6200 - 6000)
Combined total = 4006200 KBtu
INTEGER FORMAT OUTPUT NETWORK VARIABLES
(continued)
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