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MELSEC-Q
3 SPECIFICATIONS
(2) When the sequence program is used
The following explains the I/O communication function when the sequence
program is used.
PLC CPU QJ71DN91 Slave node
SET Y11
X01
I/O communication
in progress
FROM
X01
I/O communicating
TO
I/O communication
request
1)
3)
Master function
receive
data area
0700
H
07FF
H
4)
Master function
transmit
data area
0900
H
09FF
H
Transmission
Reception
3)
2)
[I/O communication]
1) When the I/O communication request (Y11) is set, the I/O
communication with each slave node starts. It is not necessary to set
Y11, however, when the auto communication start is set with a
parameter.
[Reception data]
2) The input status from each slave node is automatically stored in the
"master function receive data" area of the buffer memory in the
QJ71DN91.
3) The input status stored in the "master function receive data" area of the
buffer memory is loaded onto the PLC CPU by the FROM instruction of
the sequence program.
[Transmission data]
4) The ON/OFF information to be sent to the slave node is written into the
"master function transmit data" area of the buffer memory by the TO
instruction of the sequence program.
5) The ON/OFF information stored in the "master function transmit data"
area is automatically sent to the slave node.