MODULE #5 - PROGRAM TOTALIZER/INTEGRATOR
Programming for the totalizer/integrator consists of four programming
steps: decimal point position, time base, scale factor, and low signal disable.
The totalizer value will roll over and flash when the total exceeds, 999999 or
-99999, indicating an overflow condition. Reverse signal input will cause the
totalizer value to count in the opposite direction and eventually no longer be
in an overflow condition.
PROGRAM DECIMAL POINT POSITION FOR THE
TOTALIZER
The decimal point positions for the totalizer are as follows:
“dECPNt” < > “0”
“0.0”
“0.00”
“0.000”
“0.0000”
PROGRAM TOTALIZER/INTEGRATOR TIME BASE
The time base determines the rate at which readings increase. The totalizer
display is updated 2
1
2
times per second regardless of time base selected, but
longer time bases decrease the magnitude of each increase. The three time
bases are per sec., per min. and per hr. A constant signal input of 1000 units,
for example, would totalize to 1000 units in one second
(with a TB of 1 sec.)
,
1000 units in one minute
(with a TB of 1 min.)
, and 1000 units in one hour
(with a TB of 1 hr.)
.
Note: Input changes can be made synchronous the display by programming E1
or E2-CON pin for function 13, Instrument reading synchronization.
A multiplying scale factor may be used to span the standard time ranges
(or
divide if scale factor < 1)
. The following equation expresses the totalization
process.
S.F. =
D.T.
X
T.B.
X
D.T.D.P.
I.D.
TIME
I.D.D.P.
S.F. = Programmable Scale Factor
D.T. = Desired Total for a fixed
time duration
T.B. = Programmable Time Base
TB = If Program Select Number Chosen Is:
Enter In Formula
“0” for sec.
=
“1”
“1” for min.
=
“60”
“2” for hr.
=
“3600”
I.D. = Input Display Value
TIME = Actual Time period in seconds
D.T.D.P. = Desired Total Decimal Point
Enter In Formula
0
1
0.0
10
0.00
100
0.000
1000
0.0000
10000
I.D.D.P. = Input Display Decimal Point
Enter In Formula
0
1
0.0
10
0.00
100
0.000
1000
0.0000
10000
“tbASE” < > “0” - per second
“1” - per minute
“2” - per hour
PROGRAM THE TOTALIZER SCALE FACTOR
As explained in the previous programming step, a multiplying scale factor
can be used to scale the update rate as required. This may be used to span the
standard ranges. A scale factor of
“1.000”
has no effect on the standard ranges.
“SCLFAC” < > “0.001” to “100.000”
PROGRAM THE LOW-END CUTOUT (low signal level disable)
In order to prevent false totalization during system startup or other low
process situations where totalization is undesirable, a programmable setpoint
can be used to disable totalization when the scaled input signal falls below
this low-end cutout level.
“Lo-cut” < > “-99999” to “999999”
-14-
