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

Parameters are enabled when the CPU module is powered ON or after a reset. In addition, operations 
different from the parameter settings are possible by transferring values to special relays and special registers 
while changing these values in the program.
For details concerning special relays and specials registers for high-speed counters, refer to Page 137 
Special relay list, Page 148 Special registers list.

High-speed counters cannot count by setting the parameter alone.
The HIOEN instruction is required to start/stop the count.
For the HIOEN instruction, refer to MELSEC iQ-F FX5 Programming Manual (Instructions, Standard Functions/Function 
Blocks).

The current value of the high-speed counter is stored in a special register for each channel. You can check current value by 
monitoring the value. The value may however differ from the actual value because the special register is updated during END 
processing.
You can read the latest value using the HCMOV instruction.
For details concerning specials registers for high-speed counters, refer to Page 148 Special registers list.
For information for the HCMOV instruction, refer to MELSEC iQ-F FX5 Programming Manual (Instructions, Standard 
Functions/Function Blocks).

Precautions

 • Input used varies according to channel selected and pulse input mode.
 • If not using preset input or enable input, you can use it as input for other functions.
 • If mode is other than normal mode, preset input cannot be used.
 • Use the HIOEN instruction to start high-speed counter measurement.
 • There are common precautions when using high-speed counters. For details, refer to Page 163 Precautions when 

using high-speed counters.

Preset Value

Sets preset value when preset input is enabled.

-2147483648 to +2147483647



Input Comparison Enable/
Disable

Sets whether to "enable" or "disable" input comparison when 
preset input is enabled.

• Disable
• Enable



Control Switch

Sets preset execution timing when preset input is enabled.

• Rising
• Falling
• Rising + Falling Edge
• Always During Input ON



Enable Input Enable/
Disable

Set whether to "enable" or "disable" the enable input.

• Disable
• Enable



Input Logic

Set the enable input logic value.

• Positive Logic
• Negative Logic



Ring Length Enable/
Disable

Sets whether to "enable" or "disable" the ring length for ring 
counters.

• Disable
• Enable



Ring Length

Sets ring length when ring length setting is enabled.

2 to 2147483648



Measurement Unit Time

Not available for high-speed counters (normal mode).





Pulses No. of per Rotation