Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Page 488

486
27 TROUBLESHOOTING
27.4 Error Code List
7FCFH System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7FD1H Modem function
error
• The connection re-try
count designation is
incorrect.
CHn
ERR.
• Set the connection re-try
count to 1 to 5.

7FD2H Modem function
error
• The connection retry
interval designation is
incorrect.
CHn
ERR.
• Set the connection retry
interval to 90 to 300
(seconds).

7FD3H Modem function
error
• The initialization/
connection timeout
designation is incorrect.
CHn
ERR.
• Set the time for the
initialization/connection
timeout to 1 to 60 (seconds).

7FD4H Modem function
error
• The number of
initialization retries
designation is incorrect.
CHn
ERR.
• Set the number of initialization
retires to 1 to 5.

7FD5H Modem function
error
• The data No. for
initialization designation is
incorrect.
CHn
ERR.
• Designate the registered
number of data for
initialization or '0'.

7FD6H Modern function
error
• The data for connection of
the number specified in
the data No. for
connection designation is
incorrect.
CHn
ERR.
• Review the line type. 
7FD7H Modem function
error
• The data for connection of
the number specified in
the data No. for
connection designation is
incorrect.
CHn
ERR.
• Review the external line
outgoing number.

7FD8H System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7FD9H Modern function
error
• The line is connected to
the target, or the modem
has not been initialized.
CHn
ERR.
• Upon the completion of the
modem initialization, connect
the line to the target device
(via public line) while the line
has not been connected yet.

7FDAH Modem function
error
• The data No. for
connection designation is
incorrect.
CHn
ERR.
• Designate the registered
number of data for connection.

7FDBH
System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7FDCH Modern function
error
• The data for connection of
the number specified in
the data No. for
connection designation is
incorrect.
CHn
ERR.
• Review the data for
connection.

7FDDH Modem function
error
• The connection timeout
error occurred.
CHn
ERR.
• Review the telephone number
in the data for connection.
• Check whether the connection
target is connectable.
• Review the setting value for
the connection timeout.
• Review the data for
initialization.

Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined