Mitsubishi Electric MELSEC iQ-R Series User Manual page 20

Communications using LX and LY
This function is used to exchange data between the I/O master station that controls LX and LY and another station on a one-
to-one (1:1) basis.
Up to two I/O master stations can be set for one network (block 1 and block 2), regardless of the status of control or normal
station. The link input (LX) is used to receive the information input from each station in a block, and the link output (LY) is used
to send the output information of the I/O master station.
(1)
Block 1
I/O master
station
(4)
(1) Control station (station No.1)
(2) Normal station (station No.2)
(3) Normal station (station No.3)
(4) Normal station (station No.4)
The status data of the link output (LY) of the I/O master station is output to the link input (LX) of another station, and the status
data of the link output (LY) of another station is stored in the link input (LX) of the I/O master station.
RCPU
X
Ù
Link refresh
Ò
Sequence
scan
Y
Ó
Link refresh
Station No.2 , Station No.3 , Station No.4 : Send range to stations No.2, No.3, and No.4
 Station No.2,  Station No.3,  Station No.4: Send range from stations No.2, No.3, and No.4
• Output from the I/O master station
 The device is turned on by the sequence scan of the CPU module.
 The status data of the device of the CPU module are stored in the link output (LY) of the I/O master station by link refresh.
 The status data of the link output (LY) of the I/O master station are stored in the link input (LX) of another station by link scan.
 The status data of the link input (LX) of another station are stored in the device of the CPU module by link refresh.
• Input from another station
 The device is turned on by the sequence scan of the CPU module.
 The status data of the device of the CPU module are stored in the link output (LY) of another station by link refresh.
 The status data of the link output (LY) of another station are stored in the link input (LX) of the I/O master station by link scan.
 The status data of the link input (LX) of the I/O master station are stored in the device of the CPU module by link refresh.
1 FUNCTIONS
18
1.1 Cyclic Transmission Function
LX
LY
LX
LY LX
LY
Station No.1
I/O master Another station
station
LX
Ø
Station No.2
Ø
Station No.3
Ø
Station No.4
Link
scan
LY
Ô
Station
→
No.2
Ô
Station
→
No.3
Ô
Station
→
No.4
(2) (1)
LX
(3) (4)
LY
Station No.2 Station No.3
Another station
LY
←Station
No.2
LY
←Station
No.3
LX
Station No.2
LX
Station No.3
(2)
LY LX
Block 2
(3)
I/O master
station
Station No.4
Another station
×
LY
Link refresh
←Station
No.4
Õ
LX
Link refresh
Station No.4
RCPU
Y
Ö Ö
Sequence
scan
X