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19 BUILT-IN I/O FUNCTION
19.4 Pulse Catch Function
19.4 Pulse Catch Function
This section explains the pulse catch function.
Outline of pulse catch function
The CPU module has a built-in pulse catch function which enables pulse signals that are incompletely sampled in regular
input processing to be caught. Inputs X0 to X17 on the CPU module can be used on up to eight channels.
To use the pulse catch function, pulse catch setting and the input response time must be set with parameters.
An FX3-compatible pulse catch function is also mounted on the CPU module, For details of functions, refer to Page 188
FX3-Compatible Pulse Catch Function.
The pulse catch function and FX3-compatible pulse catch function can be used simultaneously.
Specifications of pulse catch function
The specifications of the pulse catch function are explained below.
Performance specifications
Pulse catches can be used on inputs X0 to X17.
■Input response time
Input response times are shown below.
■Detectable pulse width
Pulse widths that satisfy the following condition can be detected.
Pulse input ON width > input response time
Pulses cannot be detected normally if the above condition is not satisfied. Set the input response time so that
the above condition is satisfied.
Pulse catch function execution procedure
The procedure for executing the pulse catch function is explained below.
1. Check the pulse catch specifications.
Check specifications such as the input response time of the pulse catch. (Page 184 Specifications of pulse catch
function)
2. Connect the CPU module to the external device.
For details on wiring to external devices, refer to the following manual
MELSEC iQ-F FX5U User's Manual (Hardware)
MELSEC iQ-F FX5UC User's Manual (Hardware)
3. Set the parameters.
Set the pulse catch setting and other parameters. (Page 185 Pulse catch parameters)
4. Create the program.
5. Run the program.
FX5U-32M, FX5UC-32M FX5U-64M, FX5U-80M Input response time
X0 to X5 X0 to X7 5 s
X6 to X17 X10 to X17 100 s