Mitsubishi Electric FX5 User Manual page 243

Precautions
If the ring length is set to less than the lower limit value or more than the upper limit value, the ring length operates at the lower
limit value or the upper limit value. However, the set value is stored as is.
High-speed counter measurement unit time
These devices set the measurement unit of pulse density measurement mode.
■Corresponding devices
The device numbers corresponding to each channel of the CPU module are as follows.
CH1 CH2
SD4517, SD4547,
SD4516 SD4546
■Description
These devices set the time to measure pulse density (rotational speed) in 1 ms units when high-speed counters are operating
in pulse density measurement mode.
• If the value is modified while the high-speed counter is operating, the rewritten value is reflected after the
measurement before the value was modified is finished.
• If the FX3 compatible high-speed counter function is valid, these devices operate only when the SPD/DSPD
instruction operates. The value in the operand of the SPD/DSPD instruction is written.
■Clear timing
The timing when the device is cleared is as follows.
• Power ON, Reset, STOP→RUN
Precautions
If the set value for the measurement unit time is set to less than the lower limit value or more than the upper limit value, the
measurement unit time operates at the lower limit value or the upper limit value. However, the set value is stored as is.
High-speed counter number of pulses per rotation
These devices set the number of pulses per rotation for rotational speed measurement mode.
■Corresponding devices
The device numbers corresponding to each channel of the CPU module are as follows.
CH1 CH2
SD4519, SD4549,
SD4518 SD4548
■Description
These devices set the number of pulses per rotation when a high-speed counter operates in rotational speed measurement
mode. The rotational speed is measured with the set value.
• If the value is modified while the high-speed counter is operating, the rewritten value is reflected after the
measurement before the value was modified is finished.
• These devices do not operate when the FX3 compatible high-speed counter function is valid.
■Clear timing
The timing when the device is cleared is as follows.
• Power ON, Reset, STOP→RUN
CH3 CH4
SD4577, SD4607,
SD4576 SD4606
CH3 CH4
SD4579, SD4609,
SD4578 SD4608
CH5 CH6
SD4637, SD4667,
SD4636 SD4666
CH5 CH6
SD4639, SD4669,
SD4638 SD4668
24 HIGH-SPEED INPUT/OUTPUT FUNCTION
24.1 High-speed Counter Function
CH7 CH8
SD4697, SD4727,
SD4696 SD4726
CH7 CH8
SD4699, SD4729,
SD4698 SD4728
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