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MELSEC-Q
10 DEVICES
2) Although writing is also allowed in the "refresh range" portion of the link
device range (specified by 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 High Performance model QCPU related devices
designated by refresh parameter.
[Sequence program]
"100" is written to network module LW1 when
the MOV instruction is executed.
MOV K100
W1
MOV W1 J1\W1
"100" is written to network module LW1 when
a refresh occurs.
[Writing timing]
MOV K100
MOV
Writing at
instruction
execution
W0
W1
LW1
Writing at instruction execution
QCPU
Network module
Writing at refresh operation
W1
W1 J1\W1
[Refresh parameter settings]
Network No. : 1
High Performance model QCPU(W0 to W3F) Network module (LW0 to LW3F)
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 allowed in the entire link device range of
network modules.
POINT
Only one network module capable of writing/reading link direct devices can be used
per network number.
If two or more network modules are installed at the same network number, the
network module with the lowest first I/O number will be the one that handles
writing/reading using link direct devices.
For example, if station No.1 and station No.2 network modules are installed in
network No.1 as shown in the figure below, the station No.2 network module will
handle link direct device operations.
Power supply module
Station
No.2
Network No.1
Writing/reading using link direct devices not allowed
Writing/reading using link direct devices allowed
Network module
Station
No.1
CPU module
Network module
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