MODULE #5 - PROGRAM INTEGRATOR/TOTALIZER
Programming for the integrator/totalizer consists of four programming steps:
totalizer decimal point position, time base, scale factor and low temperature
disable. Note that the decimal point position of the integrator/totalizer can be set
independent of the decimal point position of the input. 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
INTEGRATOR/TOTALIZER
The decimal point position for the totalizer are as follows:
“dECPNt” < > “0”
“0.0”
“0.00”
“0.000”
“0.0000”
PROGRAM INTEGRATOR/TOTALIZER TIME BASE
The time base determines the rate at which readings increase. The
integrator/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 second, per minute and per hour. A constant input
temperature of 100°, for example, would integrate/totalize to 100° in one second
(with a TB of 1 sec.)
, 100° in one minute
(with a TB of 1 min.)
, and 100° in one
hour
(with a TB of 1 hr.)
.
(Note: Input changes can be made synchronous to the
display by programming E1 or optional 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 integration/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 Totalizer value 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 Totalizer Value 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 Value Decimal Point
Enter in Formula
0
1
0.0
10
“tbASE” < > “0” - per second
“1” - per minute
“2” - per hour
PROGRAM THE INTEGRATOR/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 temperature level
disable)
In order to prevent false integration/totalization in situations where
integration/totalization is undesirable, a programmable setpoint can be used to
disable integration/totalization when the input temperature falls below this
low-end cutout level.
“Lo-cut” < > “-999” to “9999”
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