Cyclic Transmission Function (Periodic Communication); Communicating With Input/Output Module - Mitsubishi QJ71LP21 Reference Manual

3 SPECIFICATIONS

3.2.1 Cyclic transmission function (Periodic communication)

Remote master station
QCPU
X Y
0
Actual I/O
X1000
1000
to
100F
Y1010
1FFF
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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 input/output module and when it is an intelligent module
connected to it.

(1) Communicating with input/output module

The remote master station uses input/output X/Y(LX/LY) device after the actual
I/O for the host so that there can be communication with the input/output module
on the remote I/O station
When communicating between the remote master station and the remote I/O
station, network data is written 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
input/output module communication, even with the default settings. Change the
settings of the PLC parameters as needed.
Master module
LX LY
0
Actual I/O
1000
to
1010 100F 1010
to to
101F 101F
1FFF
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.
Remote I/O station
Remote I/O module Input module
LX LY
0
to
0F
10
to
1F
MELSEC-Q
Output module
X Y
0 10
1 11
2 12
3 13
4 14
5 15
6 16
7 17
8 18
9 19
A 1A
B 1B
C 1C
D 1D
E 1E
F 1F
1) 2)
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