Mitsubishi Electronics FX5 ユーザーズマニュアル

19  BUILT-IN I/O FUNCTION

19.1  High-speed Counter Function

■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

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

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.

SD4505, 
SD4504

SD4535, 
SD4534

SD4565, 
SD4564

SD4595, 
SD4594

SD4625, 
SD4624

SD4655, 
SD4654

SD4685, 
SD4684

SD4715, 
SD4714

SD4507, 
SD4506

SD4537, 
SD4536

SD4567, 
SD4566

SD4597, 
SD4596

SD4627, 
SD4626

SD4657, 
SD4656

SD4687, 
SD4686

SD4717, 
SD4716