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3-6 Passing Time: f6
Application example
Measures the passing time for a conveyor line.
Distance
Basic Operation
Measures and displays the input pulse frequency of INA in units of seconds.
By selecting an appropriate prescale value, object passing time D in the range
determined by the prescale value will be displayed. Obtain display value D as
follows:
D (sec) = 1/f
A
x α
f
A
: INA input frequency (Hz)
α: prescale value of INA
Rotational speed = Input frequency (f) x (1/No. of pulses (N) per 1 cycle)
Circumferential speed = Circumference of roll (πd) x rotational speed
Passing time = Processing length (L)/Circumferential speed
INB input will be ignored.
Passing time is measured in this mode. Therefore, if the K3NR does not receive
any pulses for a certain period, the K3NR estimates passing time using the esti-
mated frequency calculation function and increases the displayed value.
Mode Unit of display value Prescale value
Passing time sec L/(πd/N)
N = No. of pulses per 1 cycle from input A
πd = Circumferential length (m) per 1 cycle
L = Processing length (m)
Note The K3NR can display the hour, minute, and second. Refer to page 65 for de-
tails.
Example:
Displaying passing time (sec) using a rotary encoder with 100 output pulses
per revolution.
Circumference of rotary encoder = 0.125 m
Process length = 5 m
Prescaling value (α) = 5/(0.125/100) = 4000 = 4.000 x 10
3
Prescale value = X x 10
Y
(X: mantissa, Y: exponent)
X (mantissa) of input A = 4.000
Y (exponent) of input A = 3
Refer to 4-2 Setting Mode.
FUNCTION
SETTING
REFERENCE
Passing Time: f6
Section 3-6
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