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MELSEC-Q
4 WHEN THE QCPU ACCESSES THE OTHER STATION PLC USING THE
DATA LINK INSTRUCTION
(2) Instruction execution timing
(a) When normal completion
1) ZNRD instruction
0 END
Sequence scan
0END0 END 0 END 0 END
Read command
ZNRD
1 scan
0 END
Sequence scan
0 END0 END
100
OFF
Read completion
(Device designated with (D2))
Local station
QCPU
Read completion device
((D2)+1 device)
Ethernet
module
Ethernet
module
Target station
PLC CPU
Read data storage device
(Device designated with (S))
?
Read data storage device
(Device designated with (D1))
0 END 0 END
100
Channel 1 (fixed)
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