Mitsubishi Electric MELSEC iQ-R Series User Manual page 482

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