Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Page 489

27 TROUBLESHOOTING
27.4 Error Code List
487
27
7FDEH Modem function
error
• Connection to the modem/
TA failed, or a modem/TA
is not connected.
CHn
ERR.
• Check if the modem/TA has
any failure by referring to the
instruction manual for the
modem/TA.
• Connect the modem/TA to
C24.
• Check the connection cable
by referring to the instruction
manual for the modem/TA.
• Check for any abnormality
according to the following
procedure.
(Page 490 Corrective
actions for system error)

7FDFH Modem function
error
• The modem connection
channel No. has not been
set.
CHn
ERR.
• Set the modem connection
CH specification to 1 or 2.

7FE0H Modem function
error
• The designated value for
modem connection
channel is incorrect.
 • Set the modem connection
CH specification to 1 or 2.

7FE1H Modem function
error
• The user frame No.
designation is incorrect.
• The output start pointer
designation is incorrect.
CHn
ERR.
• Review the user frame No.
• Designate the registered user
frame No.
• Register the designated data
for initialization.
• Set the output start pointer
designation to 1 to 100.
• Designate the position (n-th)
to which the number of data
for initialization is designated.
• Designate the number of data
for initialization to the
designated position (n-th).

7FE2H Modem function
error
• The output frame No.
designation is incorrect.
CHn
ERR.
• Designate the registered
number of data for
initialization to the range of the
designated output quantity
starting from the position of
the output start pointer
designation.

7FE3H Modem function
error
• The registration data byte
count designation is
incorrect.
CHn
ERR.
• Set the data for initialization to
1 to 78.
• Set the data for connection to
80.

7FE4H 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.

7FE5H Modem function
error
• The no-communication
interval time designation
is incorrect.
CHn
ER
R.
• Set the no-communication
interval time designation to 0
to 120.

7FE6H Remote password
error
• Remote passwords do not
match.
 • Review the remote password
and restart data
communications.

Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined