Mitsubishi Electric MELSEC-Q Series User Manual page 194

10 DEVICES
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2) Although writing is also possible in the "refresh range" portion of the
link device range (specified by the refresh parameters), the link
module's link device data will be rewritten when a refresh operation
occurs.
Therefore, when writing by link direct device, the same data should
also be written to the Basic model QCPU related devices designated
by the refresh parameters.
[Refresh parameter settings]
Network No. : 1
Basic model QCPU(W0 to W3F)
[Sequence program]
[Writing timing]
MOV K100
MOV
Writing at instruction execution
3) When data is written to another station's writing range using a link
direct device, the data which is received from that station will replace
the written data.
(b) Reading
Reading by link direct device is possible in the entire link device range of
network modules.
Network module (LW0 to LW3F)
MOV K100 W1
MOV W1 J1\W1
Basic model QCPU
Writing at
W1
instruction
execution
W1 J1\W1
W0
W1
MELSEC-Q
"100" is written to link module LW1 when
a refresh occurs.
"100" is written to link module LW1 when
the MOV instruction is executed.
Network module
LW1
Writing at refresh operation
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