Mitsubishi Electric QJ71C24N-R4 - Communication Is Not Available Via the Modem

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MELSEC-Q
11 TROUBLESHOOTING
11.3.16 Communication is not available via the modem.
Symptom Cause Corrective action MC
Non
procedure
protocol
Bidirectional
protocol
Pre-defined
• Auto modem initialization
cannot be executed.
• A modem initialization error occurs.
• Check the error code and execute
processing accordingly.
• Modem connection channel designation
is not performed.
• Set Modem connection channel
designation.
• There is an error in the switch settings in
the GX Developer.
• Review the switch settings. Set it to
match the local station modem and the
TA.
• Data cannot be
communicated with GX
Developer supporting the
Q series C24.
• Communication protocol setting is
incorrect.
• Set the communication protocol to MC
protocol, format 5.
• Transmission setting does not match the
external device.
• Review the transmission setting.
• Communication rate does not match the
external device.
• Review the communication rate setting.
• The GX Developer does
not receive the callback
signals from the Q series
C24.
• The product is not supported by the GX
Developer.
• Confirm the GX Developer's S/W
version.
• There was an error in the GX Developer
connection system.
• Check the GX Developer's connection
system.
• Set the connection system on “callback
reception waiting” and connect.
• There is an error in the GX Developer
side's modem settings.
• Set the modem's settings on "Auto
Reception."
• Callback connections
from the GX Developer
are refused by the Q
series C24.
• There s an error in the GX Developer's
connection system.
• Check the GX Developer's connection
system.
• Correct the Q series C24's settings.
• There is an error in the connection
system's telephone No.
• Check the telephone No.
• Change the telephone No. to the data
for callback.
• When performing Auto
(callback: during fixed/
during designated
number) from the GX
Developer, connection to
the Q series C24 is
refused.
• There is an error in the Q series C24
setting value.
• Set the callback function designation on
the setting 1 to 3.
• There is an error in the GX Developer's
connection system.
• Check the GX Developer's connection
system.
• Check the Q series C24's settings.
• There is an error in the telephone No. of
the connection system.
• Check the telephone No.
• Change the telephone No. to the data
for callback.
• It is possible to connect
from the GX Developer,
but callback from the Q
series C24 cannot be
performed.
• The timer value for the status of the
modem used or the line is short.
• Adjust each of the timer values for the
callback function on the GX Developer
side. (Line callback cancel wait time,
callback delay time)
• There is a problem with the modem
specifications or settings.
• Check the modem's specifications and
settings.