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19 BUILT-IN I/O FUNCTION
19.1 High-speed Counter Function
19 BUILT-IN I/O 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.
19.1 High-speed Counter Function
High-speed counter function is explained below.
High-speed counter function overview
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 parameter setting
High-speed counter channels (input allocation, function) and high-speed counter comparison table, etc., are set by
parameters. (Page 123 High-speed counter parameters)
High-speed counter operation mode
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))
High-speed counter dedicated instructions
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))
Function Reference
High-speed counter function Normal mode Page 124
Pulse density measurement mode Page 126
Rotational speed measurement mode Page 129
FX3-compatible high-speed counter function Page 165
Pulse width measurement function Page 174
Pulse catch function Pulse catch function Page 184
FX3-compatible pulse catch function Page 188
General-purpose input functions Page 191
PWM function Page 193
Built-in positioning function MELSEC iQ-F FX5 User's Manual (Positioning Control)