Summary Of Bit Units Batch Write To Device Memory - Mitsubishi Electric AJ71QC24 Manual

4. COMMUNICATIONS USING A DEDICATED PROTOCOL MELSEC QnA
PC CPU
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4.8.3 Summary of bit units batch write to device memory
The following uses an image diagram to outline the communications procedure for the bit device
batch write described
in
Section 4.8.2.
QC24
External devlce
Tralner I/O panel
@
The external device sends a write request (command: 1401, subcommand:
0001)
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
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