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MELSEC-Q
7 DATA COMMUNICATIONS USING BIDIRECTIONAL PROTOCOL
7.2.3 Sequence program for data transmission
A sequence program for data transmission is explained below.
For details on the BIDOUT instruction for data transmission, see Chapter 9.
G.BIDOUT Un D0 D11 M0
M0 M1
M1
Transmission
instruction
Create transmission data from D11
(In case of the CH1 side)
Create control data from D0
Processing for normal completion
Processing for abnormal completion
(retransmission, etc.)
Q series C24 ready signal
Transmission instruction
BIDOUT instruction
BIDOUT instruction complete device
BIDOUT instruction complete device + 1
(Normal completion/abnormal completion)
Transmission data count designation area
(buffer memory address: 400
H
)
Transmission data storage area
(buffer memory address: 401
H
to)
BIDOUT
(X1E)
1 scan
0n
Transmission data
Data transmission
1)
2)
3)
4)
ON when transmission
abnormal completion
Receiving response