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4. COMMUNICATIONS USING A DEDICATED
PROTOCOL
MELSEC
QnA
F
\
If you have any situations as follows, please read the explanations
When data is written from an
external device
to the PC CPU
Response message cannot be
received. Stop.
Batch read abnormal end
Error code=
Was a sequence program (Section 4.4) written to the
PC CPU?
Are the cables connected (Section 3.3) correctly?
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 sent from the QC24.
Are the external device program (RS-232C setting,
write request command) settings (Section 4.7.1) 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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