148
8.13
Frequency Measurement Function
The frequency measurement function counts the pulses of the pulse input terminals in phase A and B, and
automatically calculates the frequency.
(1) Setting method of the frequency measurement function
1.
Set "Parameter write" for "Method selection".
"CC IE Field Configuration" window
Select a high-speed counter module in "List of stations"
[CC IE Field Configuration]
[Parameter Processing of Slave Station]
2.
Set "CH
Operation mode setting" to "1: Frequency Measurement Mode".
(2) Calculation of the frequency
The frequency measurement function calculates the frequency from the following formula.
• Frequency (Hz) = Count value per unit of time
÷
Unit of time
*1
*1
Select a unit of time from 0.01s, 0.1s, or 1s.
Therefore, when the count value per unit of time is 0, the frequency is 0(Hz).
At subtraction count, the value of the frequency is negative.
(3) Setting of the unit of time for frequency measurement
Set a unit of time by setting a value to CH
Time unit setting (Frequency measurement) (RWw18, RWw30).
Setting item
Setting range
Reference
CH
Time unit setting (Frequency measurement)
(RWw18, RWw30)
0: 0.01s
1: 0.1s
2: 1s
⎯
High-speed
counter module
Frequency
measurement
Encoder
CH Measured frequency value
(RWr1A to RWr1B, RWr32 to RWr33)
Remote register
Pulses
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