Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Page 482

480
27 TROUBLESHOOTING
27.4 Error Code List
7E48H Request error • A request was received
during parameter
communication.
PRO • Wait for awhile and transmit
the request again.

7E4FH Number of device
points error
• Number of access points
is incorrect.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.

7E50H User frame No.
designation error
• A user frame No. outside
the range was designated.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.
• Review the frame No.

7E51H User frame
unregistration
error
• An unregistered user
frame number was
designated.
PRO • Perform the frame registration
beforehand.
• Change the frame No. and
restart data communications.
• Review the frame No.

7E52H User frame
overwrite error
• An overwrite request was
issued to the frame
number which has been
already registered.
PRO • Change the write destination
to an unregistered frame
number.
• When overwriting, delete the
given number beforehand.

7E53H Requested frame
data error
• A nonexistent command
was designated in a
subcommand.
• Byte count exceeding the
number of bytes that can
be requested was
designated.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.

7E54H Modification not-
allowed error
• The setting change
enable/disable setting is
set to be disabled.
PRO • Set the setting change enable/
disable setting to 'Enable'.

7E55H User frame data
error
• The user frame variable
data has an error.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.

7E57H Flash ROM write
error
• Writing to the flash ROM
was not performed
normally.
 • Rewrite the module extended
parameter to the CPU module
or C24.
• If the error occurs after
rewriting, replace the module.

• Power is turned OFF
during writing to Flash
ROM.
CHn
ERR.
7E58H Mode
modification error
• At the time of mode
modification, the mode
No. or transmission
specifications are
incorrect.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.
• Review the parameter
settings.

7E59H Number of writing
to flash ROM
e
xceeded error
• Writing to flash ROM has
been performed 1000
times since the power was
turned ON.
• Writing to flash ROM has
been performed 100,000
times.
CHn
ERR.
• Review the program.
• Write "0" to the flash ROM
write count area (address:
2401H) and restart data
communication.
• When the number of writes
reached 100,000, replace the
module.

7E5EH PLC CPU
monitoring
function
registration error
• The programmable
controller CPU monitoring
function is registered for
the communication
protocol that does not
support the function.
CHn
ERR.
• Correct the communication
protocol setting.

Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined