Rosemount 3491, Справочное руководство, Страница: 96 / 152

Reference Manual
00809-0100-4841, Rev. AA
May 2007
Rosemount 3490 Series
4-64
About Totalising on
Model 3492
Model 3492 has two independent, internal, 8-digit, totalisers - Totaliser 1 and
Totaliser 2 - which are updated several times per second.
Totaliser 1 is dedicated to totalising the PV value (D800). When the PV value
is a volumetric flow rate (e.g. m3/hour), the totaliser can accumulate this flow,
therefore giving the total volume throughput.
Totaliser 2 operates in the same way as Totaliser 1, but counts the parameter
selected by P536. Parameter P536 offers a choice of PV, SV, TV, and FV.
A Totaliser relay can be configured to output a pulse for each increment (by
one) to the Totaliser 1 or 2 Count parameter. For information on setting up a
relay to output 'totaliser' pulses, see Sections “Relays“ on page 4-40 and
“Totalising examples“ on page 4-68.
NOTE:
For totalising examples, see “Totalising examples“ on page 4-68.
Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / TOTALISER
P530 Total 1 factor (Factor default is 0.0)
One count is added to the Totaliser Count (D828) for a quantity of flow as
defined by this parameter. The unit of measurement for D828 is defined by
parameter P531.
P531 Total 1 units (Factory default is "None")
This parameter defines the units for the Totaliser 1 Count (D828)
When using units of
gal
(US gallons), an 8-digit totaliser increments rapidly
and rolls over too frequently. To help with this, alternative totaliser units of
galx10
,
galx100
, and
galx1000
are available for selection. When these
special units are selected after selecting
gal
units, the totaliser factor (P530)
is automatically re-scaled by x10, x100, or x1000 depending on the selection.
NOTE:
If requiring Pumped Volume Totalising, see page 4-59.
P532 Total 2 factor (Factor default is 0.0)
One count is added to the Totaliser 2 Count (D829) for a quantity of liquid as
defined by this parameter. The units for D829 is defined by P533.
P533 Total 2 units (Factory default is "None")
This parameter defines the units for the Totaliser 2 Count (D829).
When using units of
gal
(US gallons), an 8-digit totaliser increments rapidly
and rolls over too frequently. To help with this, alternative totaliser units of
galx10
,
galx100
, and
galx1000
are available for selection. When these
special units are selected after selecting
gal
units, the totaliser factor (P530)
is automatically re-scaled by x10, x100, or x1000 depending on the selection.
NOTE:
If requiring Pumped Volume Totalising, see page 4-59.