User`s manual

154
● After the start of the rotation speed measurement, 1
H
: Updated is stored in CH1 Measured rotation speed value update
flag (Un\G1181) every time the measured value is stored in CH1 Measured rotation speed value (Un\G1182, Un\G1183).
The value previously stored in CH1 Measured rotation speed value (Un\G1182, Un\G1183) is hold while 0
H
: Not updated
is being stored in CH1 Measured rotation speed value update flag (Un\G1181).
● The margin of error (maximum) of the rotation speed measurement function is calculated from the following formula.
The table below shows the each value to be put into the formula.
The margin of error (maximum) is calculated as shown below.
● CH1 Measured rotation speed value update flag reset command (Un\G1170) responds within 2ms after the action.
● Do not use CH1 Measured rotation speed value update flag (Un\G1181) and CH1 Measured rotation speed value update
flag reset command (Un\G1170) when retrieving CH1 Measured rotation speed value (Un\G1182, Un\G1183) via the auto
refresh target device. (In case 1
H
: Updated is stored in CH1 Measured rotation speed value update flag (Un\G1181) after
the auto refresh is done, the updated values are not reflected to the auto refresh target device and therefore, the values
retrieved via the auto refresh target device are the ones before the updating.)
Item Value
Real rotation speed (r/min) 1234r/min
A unit of time for rotation speed measurement (s) 0.01s
Number of moving average count for rotation speed
measurement
4 times
Number of pulses per rotation 60
100(ppm)
1000000
60
A unit of time for rotation
speed measurement (s)
Number of moving average count
for rotation speed measurement
Number of pulses
per rotation
Real rotation
speed (r/min)
+
Ex.
1234(r/min) +
= 0.1234(r/min) + 25(r/min)
= 25.1234(r/min)
100(ppm)
0.01(s) 4 60
60
1000000