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4. COMMUNICATIONS USING A DEDICATED
PROTOCOL
MELSEC
QnA
4.7.3
Summarv of word units batch write to device memorv
The following uses an image diagram to outline the communications procedure for the word
device batch write described in Section 4.7.2.
@
The external device sends a write request (command: 1401, subcommand:
0000)
to the QC24.
@
When the QC24 receives this request, it sends a data write request to the PC CPU while the
PC CPU is performing END processing.
@
After the PC CPU writes the data, it sends the result to the QC24.
@
The QC24 sends the write result to the external device.
PC CPU
QC24
sequence
Step
0
END Step0
END
program
H
f
External devlce
I
4
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