Omron K3HB-C User Manual page 72

■ F3: Error Ratio
Measuring the Line Speed Error Ratio between Two Conveyors
Operation Configuration (Application)
• Basic Operation
The error ratio between the frequency of input A and the
frequency of input B is displayed as a percentage (%).
The measurement value can be obtained using the following
formula:
fb fa
D = 100
fa
fa: Frequency A (Hz)
: Prescale value A
D: Error ratio (%)
* When fa x = 0, an overflow will be displayed at the upper limit.
(When fa x = 0, 0 will be displayed.)
Example:
This example shows the prescale values and the prescale set
values for displaying the line speed (m/min) error ratio between
two conveyors using two rotary encoders, each of which outputs
100 pulses per rotation. (The circumferential length of the rotary
encoder is 0.125 m.)
Prescale value of Input A ( ) = 0.125/100 = 0.00125 = 1.2500
3
10
Prescale value of Input B ( ) = 0.125/100 = 0.00125 = 1.2500
3
10
Prescale value of Input A, X (mantissa): ps. ax = 1. 2500
Prescale value of Input A, Y (exponent): ps. ay = 10 -3
Prescale value of Input B, X (mantissa): ps. bx = 1. 2500
Prescale value of Input B, Y (exponent): ps. by = 10 -3
5.1 Setting the Function for the K3HB-R
Encoder
Communications output
To computer
Remote monitor
fb: Frequency B (Hz)
: Prescale value B
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