PROGRAMMING MODULE #5 - PROGRAM TOTALIZER/INTEGRATOR
Programming for the totalizer/integrator consists of four programming steps:
totalizer decimal point position, time base, scale factor and low signal disable.
Note that the decimal point position of the totalizer can be independent of the
decimal point position of the scaled input signal. 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 position 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 second,
per minute and per hour. 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 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 totalization process.
S. F.
D. T.
I. D.
T. B.
TIME
D. T. D. P.
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 Decimal Point
Enter in Formula
01
0.0 10
0.00 100
0.000 1000
0.0000 10000
I.D.D.P. = Input Display Value Decimal Point
Enter in Formula
01
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-
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