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MELSEC-QnA
15 FUNCTIONS (FUNCTION VERSION B OR LATER)
15.4.2 Asynchronous mode
Performs data link without synchronizing with the sequence program. The operation
overview in the asynchronous mode is shown in Figure 15.2.
1
Sequence scan > link scan
END END END END
Send
LS : Link scan
SM : Sequence scan
No receiving
No
receiving
SendSend
Send
Output transmission delay (SM + LS 2)
Input transmission delay
(LS
2)
Receive
Receive
ReceiveReceiveReceive Receive
Update data after completing send
2
Sequence scan < link scan
Input transmission delay
(LS
2)
END END END END ENDEND END END END
Send
Link scan
Sequence
scan
N
o
r
e
c
e
i
v
i
n
g
Send
Send Send
Send
Send
Send
Send Send
Update data after completing send
Output transmission delay (SM + LS
2)
N
o
r
e
c
e
i
v
in
g
N
o
r
e
c
e
i
v
i
n
g
Receive ReceiveReceiveReceiveReceive
Figure 15.2 Operation overview in the asynchronous mode