Frequency Measurement Function - Mitsubishi Electric NZ2GFCF-D62PD2 User Manual

8.16

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) Restrictions
During operation in the synchronous communication mode, the frequency measurement function cannot be used.
Set "CH Operation mode setting" to "0: Normal Mode".
(2) 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]  [Online]  [Parameter Processing of Slave Station]
2.
Set "CH Operation mode setting" to "1: Frequency Measurement Mode".
(3) 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 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.
(4) 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
CH Time unit setting (Frequency measurement)
(RWw18, RWw30)
162
Pulses
Encoder
0: 0.01s
1: 0.1s
2: 1s
High-speed
counter module
Frequency
CH
measurement
(RWr1A to RWr1B, RWr32 to RWr33)
*1
Setting range
Remote register
Measured frequency value
Reference
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