25
3-2
Absolute Ratio:
f2
Operation example
Measures the
rotation ratio of
the rolls.
Basic Operation
Displays the absolute ratio of the frequencies of INA and INB in percentage. Ob-
tain display value D as follows:
D (%) =
f
B x
β
f
A x
α
x 100
f
A
: Input frequency of INA (Hz)
f
B
: Input frequency of INB (Hz)
α
: Prescale value of INA
β
: Prescale value of INB
Mode
Unit of display
Prescale value
Absolute ratio
%
Na and Nb or
π
da/Na and
π
db/Nb
Where,
Na: Number of pulses per revolution from A input
Nb: Number of pulses per revolution from B input
π
da: Circumference (m) per revolution for A input
π
db: Circumference (m) per revolution for B input
Example:
Displaying absolute revolution rate using two rotary encoders each with
1,000 output pulses per revolution.
Prescale value of INA (
α
) = 1/1000 = 0.001 = 1.0000 x 10
–3
Prescale value of INB (
β
) = 1/1000 = 0.001 = 1.0000 x 10
–3
Prescale value = X x 10
Y
(X: mantissa, Y: exponent)
X (mantissa) of input A = 1.0000
Y (exponent) of input A = –3
X (mantissa) of input B = 1.0000
Y (exponent) of input B = –3
Refer to
4-2 Setting Mode
.
FUNCTION
SETTING
REFERENCE
Absolute Ratio:
f2
Section 3-2
