151
CHAPTER 8 FUNCTIONS
8
8.13 F
requ
ency Measureme
nt Function
●
The margin of error (maximum) of the frequency measurement function is calculated from the following formula.
The following table shows each value to be put into the formula.
The margin of error (maximum) is calculated as shown below.
●
CH
Measured frequency value (RWr1A to RWr1B, RWr32 to RWr33) is updated without resetting CH
Update flag
(Measured frequency value) (RX2D, RX45).
●
CH
Update flag reset command (Measured frequency value) (RY2C, RY44) responds within
Δ
T
1
after the action. For
Δ
T
1
, refer to the following.
• Internal Control Cycle and Response Delay Time (
No.
Description
1)
The following processing is performed when CH
Count enable command (RY24, RY3C) is turned on to turn CH
Frequency
measurement flag (RWr20.b4, RWr38.b4) to Operating (1).
• The values in CH
Time unit setting (Frequency measurement) (RWw18, RWw30) and CH
Moving average count (Frequency
measurement) (RWw19, RWw31) are acquired. (If the value is changed during the frequency measurement, the change is
ignored.)
• CH
Update flag (Measured frequency value) (RX2D, RX45) turns off.
• The value in CH
Measured frequency value (RWr1A to RWr1B, RWr32 to RWr33) is cleared to 0.
2)
CH
Update flag (Measured frequency value) (RX2D, RX45) turns on when a value is stored in CH
Measured frequency value
(RWr1A to RWr1B, RWr32 to RWr33).
3)
When CH
Update flag reset command (Measured frequency value) (RY2C, RY44) is turned off then on, the high-speed counter
module turns off CH
Update flag (Measured frequency value) (RX2D, RX45) and turns on CH
Update flag reset completed
(Measured frequency value) (RX2C, RX44).
After that, CH
Update flag reset completed (Measured frequency value) (RX2C, RX44) turns off when CH
Update flag reset
command (Measured frequency value) (RY2C, RY44) is turned off.
4)
CH
Measured frequency value (RWr1A to RWr1B, RWr32 to RWr33) is updated even when CH
Update flag (Measured
frequency value) (RX2D, RX45) is on.
5)
CH
Frequency measurement flag (RWr20.b4, RWr38.b4) changes to Not operating (0) when CH
Count enable command
(RY24, RY3C) is turned off.
Item
Value
Real frequency (Hz)
1234Hz
Time unit (Frequency measurement) (s)
0.01s
Moving average count (Frequency measurement)
2 times
Real frequency (Hz)
+
100 (ppm)
1000000
Time unit
(Frequency measurement) (S)
Moving average count
(Frequency measurement)
1
Ex.
= 50.1234 (Hz)
= 0.1234 (Hz) + 50 (Hz)
+
1234 (Hz)
100 (ppm)
1000000
0.01 (s) 2
1
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