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4. COMMUNICATIONS USING A DEDICATED
PROTOCOL
MELSEC
QnA
4.5.3
Summary of device memory word units batch read
The following uses an image diagram to outline the communications procedure for the device
memory word units batch read described in Section 4.5.2.
Switch
X2F
-
X20
@
The external device sends a read request (command: 0401, subcommand:
0000)
to the QC24.
@
When the QC24 receives this request, if the PC CPU is performing END processing, the QC24
sends a read request to the PC CPU.
@
The PC CPU passes the data to the QC24.
- 1
Binary data
@
The QC24 converts the read data to ASCII data and sends the
J
Conversion
ASCII data to the external device.
ASCII data
PC CPU
0
QC24
4 - 1 9
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