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MELSEC-Q
3 SPECIFICATIONS
3.2.1 Cyclic transmission function (periodic communication)
The cyclic transmission function periodically exchanges data between the remote
master station and remote I/O station using link device (LX/LY/LB/LW)
The following explains the differences between when the module connected to the
remote I/O station is an I/O module and when it is an intelligent module connected to it.
(1) Communicating with I/O modules
The remote master station uses input/output X/Y(LX/LY) devices after the actual
I/O for the host so that there can be communication with the I/O module on the
remote I/O station.
To perform communications between the remote master station and the remote
I/O station, write the network parameters to the remote master station.
The device range for communicating with each remote I/O station is set by the
remote master station common parameters.
PLC parameters written to the remote I/O station will not cause problems with the
I/O module communication, even with the default settings. Change the settings of
the PLC parameters as needed.
Actual I/O
XY
0
1000
100F
1010
101F
1FFF
LX LY
0
1000
100F
1010
101F
1FFF
Y1010
X1000
QCPU
Master module
Remote master station
1
)
LX LY
0
0F
10
1F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
XY
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
2
)
Remote I/O station
Remote I/O module
Input module Output module
to
to to
to
to
to
1) When X0 for the input module for the remote I/O station is set to on,
the X1000 for the remote I/O station is set to on.
2) When Y1010 for the remote master station is set to on, the Y10 for the
remote I/O station output module is set to on.