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

Details concerning special relays used for high-speed counters are explained below.

Device for monitoring operation status of each channel of the high-speed counter.

■Corresponding devices

The device numbers corresponding to each channel are as follows.

■Operation Description

The content of the operation when ON and when OFF is as follows.

These devices also operate when the FX3 compatible high-speed counter function is valid.

■Update timing

The timing of device update is as follows.

Device for monitoring operation of the high-speed counter when using pulse density/rotational speed measurement mode.

■Corresponding devices

The device numbers corresponding to each channel are as follows.

■Operation Description

The content of the operation when ON and when OFF is as follows.

If the FX3 compatible high-speed counter function is valid, these devices operate only when the SPD 
instruction operates.

■Update timing

The timing of device update is as follows.

SM4500

SM4501

SM4502

SM4503

SM4504

SM4505

SM4506

SM4507

High-speed counter operating

High-speed counter stopped

• High-speed counter driven by the HIOEN instruction
• SPD instruction ON execution
• UDCNTF instruction is executed ON (when the FX3 compatible high-speed 

counter function is valid)

• High-speed counter stopped by the HIOEN instruction
• Power ON, reset, STOP, PAUSE
• UDCNTF instruction is executed OFF (when the FX3 compatible high-

speed counter function is valid)

SM4516

SM4517

SM4518

SM4519

SM4520

SM4521

SM4522

SM4523

Pulse density/rotational speed measurement mode operating
Updates measurement results by measuring unit time.

Pulse density/rotational speed measurement mode stopped or not being used

• Pulse density/rotational speed measurement mode is set in parameter and 

pulse density/rotational speed measurement is driven by the HIOEN 
instruction.

• SPD instruction ON execution

• Pulse density/rotational speed measurement mode is set in parameter and 

pulse density/rotational speed measurement is stopped by the HIOEN 
instruction.

• Power ON, reset, STOP, PAUSE