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4. COMMUNICATIONS USING A DEDICATED
PROTOCOL
MELSEC
QnA
4.6.3
Summatv of device memorv bit units batch read
The following uses an image diagram to outline the communications procedure for the device
memory bit units batch read described in Section 4.6.2.
( i J
The external device sends a read request (command: 0401, subcommand: 0001) to the QC24.
@
When the QC24 receives this request, it sends a read request to the PC CPU while the PC
CPU is performing END processing.
@
The PC CPU passes the data to the QC24.
@
The QC24 converts the read data to ASCII data and sends the ASCII data to the external
device.
sequence
StepO
END StepO
PC CPU
program
@ (
p
External device
I
4
-
24
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