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19 BUILT-IN I/O FUNCTION
19.1 High-speed Counter Function
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■Update timing
When the current value of a high-speed counter exceeds the maximum value, the value is updated in END processing. When
the value is read using the HCMOV instruction, it is first updated to the latest value and then read. Further, when the FX3
compatible high-speed counter function is valid, the value is updated also when UDCNTF instruction is executed.
■Clear timing
The timing when the device is cleared is as follows.
• Power ON, Reset
High-speed counter minimum value
These devices store the minimum values of the high-speed counters.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
■Description
These devices stores the minimum values of the high-speed counters.
• To rewrite the minimum value, only the HCMOV instruction can be used.
• These devices also operate when the FX3 compatible high-speed counter function is valid.
■Update timing
When the current value of a high-speed counter becomes less than the minimum value, the value is updated in END
processing. When the value is read using the HCMOV instruction, it is first updated to the latest value and then read. Further,
when the FX3 compatible high-speed counter function is valid, the value is updated also when UDCNTF instruction is
executed.
■Clear timing
The timing when the device is cleared is as follows.
• Power ON, Reset
High-speed counter pulse density
These devices store the measurement results of pulse density measurement mode.
■Corresponding devices
The device numbers corresponding to each channel are as follows.
■Description
These devices store the measurement results of pulse density measurement mode (rotational speed measurement mode).
• These devices also store the pulse density measurement when in rotational speed measurement mode.
• If the FX3 compatible high-speed counter function is valid, these devices operate only when the SPD
instruction operates.
■Update timing
The pulse density is updated at each measurement unit time when set to pulse density measurement mode (rotational speed
measurement mode) with parameters.
■Clear timing
The timing when the device is cleared is as follows.
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SD4505,
SD4504
SD4535,
SD4534
SD4565,
SD4564
SD4595,
SD4594
SD4625,
SD4624
SD4655,
SD4654
SD4685,
SD4684
SD4715,
SD4714
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
SD4507,
SD4506
SD4537,
SD4536
SD4567,
SD4566
SD4597,
SD4596
SD4627,
SD4626
SD4657,
SD4656
SD4687,
SD4686
SD4717,
SD4716