155
CHAPTER 8 FUNCTIONS
8
8.14 R
otation Speed Measureme
nt Function
●
After the start of the rotation speed measurement, CH
Update flag (Measured rotation speed value) (RX2D, RX45)
turns on every time the measured value is stored in CH
Measured rotation speed value (RWr1A to RWr1B, RWr32 to
RWr33).
The value previously stored in the remote register is held while CH
Update flag (Measured rotation speed value)
(RX2D, RX45) is off. (Except at the start of the measurement)
●
The margin of error (maximum) of the rotation speed 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 rotation speed value (RWr1A to RWr1B, RWr32 to RWr33) is updated without resetting CH
Update flag
(Measured rotation speed value) (RX2D, RX45).
●
CH
Update flag reset command (Measured rotation speed 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
Rotation speed
measurement flag (RWr20.b5, RWr38.b5) to Operating (1).
• The values of CH
Time unit setting (Rotation speed measurement) (RWw18, RWw30), CH
Moving average count (Rotation
speed measurement) (RWw19, RWw31), and CH
Number of pulses per rotation (RWw1A to RWw1B, RWw32 to RWw33) are
acquired. (If the value is changed during the rotation speed measurement, the change is ignored.)
• CH
Update flag (Measured rotation speed value) (RX2D, RX45) turns off.
• The value in CH
Measured rotation speed value (RWr1A to RWr1B, RWr32 to RWr33) is cleared to 0.
2)
CH
Update flag (Measured rotation speed value) (RX2D, RX45) turns on when a value is stored in CH
Measured rotation speed
value (RWr1A to RWr1B, RWr32 to RWr33).
3)
When CH
Update flag reset command (Measured rotation speed value) (RY2C, RY44) is turned off then on, the high-speed
counter module turns off CH
Update flag (Measured rotation speed value) (RX2D, RX45) and turns on CH
Update flag reset
completed (Measured rotation speed value) (RX2C, RX44).
After that, CH
Update flag reset completed (Measured rotation speed value) (RX2C, RX44) turns off when CH
Update flag reset
command (Measured rotation speed value) (RY2C, RY44) is turned off.
4)
CH
Measured rotation speed value (RWr1A to RWr1B, RWr32 to RWr33) is updated even when CH
Update flag (Measured
rotation speed value) (RX2D, RX45) is on.
5)
CH
Rotation speed measurement flag (RWr20.b5, RWr38.b5) changes to Not operating (0) when CH
Count enable command
(RY24, RY3C) is turned off.
Item
Value
Actual rotation speed (r/min)
1234r/min
Time unit (Rotation speed measurement) (s)
0.01s
Moving average count (Rotation speed measurement)
4 times
Number of pulses per rotation
60
60
Time unit
(Rotation speed measurement) (S)
Moving average count
(Rotation speed measurement)
Number of pulses
per rotation
Actual rotation speed (r/min)
+
1000000
100 (ppm)
Ex.
1234 (r/min)
+
= 0.1234 (r/min) + 25 (r/min)
= 25.1234 (r/min)
100 (ppm)
1000000
60
0.01 (s) 4 60
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