Mitsubishi Electric MELSEC-Q Series - Page 65

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CHAPTER 4 FUNCTIONS
4
4.1 Cyclic Transmission Function 4.1.1 Communication using LB/LW
(4) Precautions
(a) When Basic model QCPU and/or safety CPU exist on the network
• Cyclic transmission through stations on which Basic model QCPU or a safety CPU is mounted
Cyclic data are transferred between each station's send range in LB/LW set in "LB/LW Setting(1)" and the
corresponding station allocated within the range of LB/LW 0 to 3FFF.
• Station on which Basic model QCPU or a safety CPU is mounted receives data from another station.
If another station's data is set over the limit of LB/LW4000, only the data up to LB/LW3FFF can be
received.
Universal model
QCPU
Universal model
QCPU
Basic model QCPU
Control station
No.1
Normal station
No.2
Normal station
No.3
Normal station
No.120
Safety CPU
Link register (LW)
No.1 send range
No.1 send range
No.2
No.3
No.1
No.2 send range
No.3
No.1
No.2
No.3 send range
No.120
No.120
No.1
No.1
No.120 send range
No.2
No.3
No.120 send range
LW0
LW1FFFF
LW3FFF
Setting range of
LB/LW settings (2)
Setting range of
LB/LW settings (1)
Universal model
QCPU
Universal model
QCPU
Universal model
QCPU
Basic model QCPU
Control station (No.1) Normal station (No.2) Normal station (No.3) Normal station (No.4)
Link register (LW)
No.1 send range
No.2
No.3
No.4
No.3
No.1 No.1 No.1
No.4
No.2
No.4
No.2
No.3
No.2 send range
No.3 send range
No.4 send range
LW0
LW4000
LW1FFFF
Unable to receive another station's
data in LW4000 or higher.