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19 BUILT-IN I/O FUNCTION
19.1 High-speed Counter Function
High-speed counter ring length
These devices set the ring length of the high-speed counters.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
■Description
These devices set the ring length of the high-speed counters.
These set values are valid when the ring length setting is set to enabled.
• While the high-speed counter is operating, the value is not reflected even if modified. It operates in the
status when the high-speed counter starts.
• 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, STOPRUN
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 are as follows.
■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
instruction operates. The value in the operand of the SPD instruction is written.
■Clear timing
The timing when the device is cleared is as follows.
• Power ON, Reset, STOPRUN
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.
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SD4515,
SD4514
SD4545,
SD4544
SD4575,
SD4574
SD4605,
SD4604
SD4635,
SD4634
SD4665,
SD4664
SD4695,
SD4694
SD4725,
SD4724
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SD4517,
SD4516
SD4547,
SD4546
SD4577,
SD4576
SD4607,
SD4606
SD4637,
SD4636
SD4667,
SD4666
SD4697,
SD4696
SD4727,
SD4726