Mitsubishi Electric MELSEC iQ-R Series User Manual page 43

Section 4 I/O SIGNALS TO CPU MODULE
(c) Synchronizing method
Please note as below in order to acquire measured harmonics data by synchronizing with this module.
(i) The program is configured to set the scan time of ladder program will be less than 500ms.
The scan time should be shorter than ON time and OFF time in order to detect "OFF → ON" of the
signal (Xn7).
(ii) Acquire data by detecting "OFF → ON" of the signal (Xn7).
Measured harmonics data is updated immediately before the signal (Xn7) is ON. Since the last value
and latest value are mixed while updating, it is able to acquire measured harmonics data at a timing
as below.
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