Mitsubishi Electronics FX5 User Manual

19  BUILT-IN I/O FUNCTION
19.1  High-speed Counter Function

The built-in input/output (I/O) function of the CPU module is explained below.
Each respective function is set by parameters in GX Works3.

High-speed counter function is explained below.

The high-speed counter is a function that counts the number of high-speed pulse inputs that cannot be counted by a 
conventional counter, using the general purpose input terminal of the CPU module.
The high-speed counter assigns input and function settings by parameters and operates using the HIOEN instruction.

Parameter setting and the HIOEN instruction are always required to use the high-speed counter.

High-speed counter channels (input allocation, function) and high-speed counter comparison table, etc., are set by 
parameters. (Page 123 High-speed counter parameters)

The three high-speed counter operation modes are as follows.
Operation mode is set by parameter. (Page 123 High-speed counter parameters)

■Normal mode

Select normal mode if you want to use as an ordinary high-speed counter. (Page 124 High-speed counter (normal mode))

■Pulse density measurement mode

Select pulse density measurement mode if you want to count the number of pulses for a specified amount of time. (Page 
126 High-speed counter (pulse density measurement mode))

■Rotational speed measurement mode

Select rotational speed measurement mode if you want to measure speed for a specified amount of time. (Page 129 
High-speed counter (rotational speed measurement mode))

The high-speed counter starts and stops counting using the HIOEN instruction for the high-speed counter. (MELSEC iQ-F 
FX5 Programming Manual (Instructions, Standard Functions/Function Blocks))

High-speed counter function

Normal mode

Pulse density measurement mode

Rotational speed measurement mode

FX3-compatible high-speed counter function

Pulse width measurement function

Pulse catch function

Pulse catch function

FX3-compatible pulse catch function

General-purpose input functions

PWM function

Built-in positioning function

MELSEC iQ-F FX5 User's Manual (Positioning Control)