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4. COMMUNICATIONS USING A DEDICATED
PROTOCOL
MELSEC
QnA
\
If you have any situations as follows, please read the explanations
A batch read request from an
external device is executed, but
Data cannot be received. Stop.
Batch read ended, but
I
Batch read abnormal end.
Error code=/:::::::!
Was the sequence program (Section 4.4) written to the
PC CPU?
Are the cables correctly connected (Section 3.3)?
Are the external device settings (Section 3.4) and QC24
switch settings (Section 4.2) correct?
Check the QC24 LEDs (Section 4.3), then check the
settings.
NAK was received from the QC24.
Are the external program (RS-232C setting, read re-
quest command) settings (Section 4.5.1) and QC24
switch settings (Section 4.2) correct?
Check the QC24 LEDs (Section 4.3). then check the
settings.
Refer to the Serial Communications Module User's
Manual for the contents of the displayed error code
and take appropriate action.
After resetting the settings, reset the PC CPU and communicate again.
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