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MELSEC-Q
6 CONVENIENT USAGE
POINT
Note the following when reading CH Periodic pulse count previous value
(Un\G16, Un\G17, Un\G48, Un\G49) and CH
Periodic pulse count present value
(Un\G18, Un\G19, Un\G50, Un\G51).
(1) When reading values using a sequence program, use the DFRO instruction or
the BMOV instruction and read values in four-word units.
[Program example]
Depending on the relation between the update timings of the previous and
present values inside the module and the read timing in the sequence
program, the previous value and the present value may be the same.
In that case, read values gain.
(See Section 8.1.2, Section 8.2.2.)
(2) When reading values using the auto refresh setting, only the value in the
device to where the present value is written may change depending on the
relation between the update timings of the previous and present values inside
the module and the auto refresh timing.
In that case, read values using a sequence program.
For details, see (1) above.