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4 WHEN THE QCPU ACCESSES THE OTHER STATION PLC USING THE
DATA LINK INSTRUCTION
Sequence scan
Send command
Sending side
Q/QnACPU
Send completion device
(Device designated with (D))
Send completion device
((D)+1 device )
Completion status
((S1)+1 device)
Ethernet
module
Ethernet
module
Sequence scan
RECV instruction
execution request flag
( 1)
Receiving side
Q/QnACPU
Receive completion device
(Device designated with (D2))
Receive completion device
((D2)+1 device)
Completion status
((S)+1 device)
4 - 13
(b) When abnormal completion
1) SEND instruction
SEND
0
END
0
Data
sending
Send error
Resend (when designated for twice)
2) RECV instruction
0
END
0
0
1 The RECV instruction execution request flag for Channel 3 used at the receiving
side Q/QnACPU is as shown below.
For Ethernet module : Bit 2 of the RECV instruction execution request area
For the N/W module : SBA2 of the link special relay
END
0
?
Channel 1
Data
Data
sending
sending
Channel 3
RECV
Arrival time over
END
0
?
(address: 205) in the buffer memory
MELSEC-Q
END
0
END
0
END
1 scan
Error code
END
0
END
0
1 scan
Error code
END
4 - 13
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