Mitsubishi Electric MELSEC iQ-R Series User Manual page 484

Error code Error
(hexadecima
l)
7EC4H Transmission
data count error,
Send and receive
buffer setting
error
7EC5H Flash ROM
access error
7EC6H Flash ROM
access error
7F00H Other module
response error
7F01H Other module
response error
7F02H CPU error
7F03H to System error
7F06H
27 TROUBLESHOOTING
482
27.4 Error Code List
Description Signal
name

• Data exceeding the send
buffer memory size was
transmitted.
• Send/receive buffer
settings are out of range.
• Writing to flash ROM was 
requested when the
setting change enable/
disable setting is set to be
disabled with Engineering
tool.

• The flash ROM read/write
request contents are
incorrect.

• An error response has
been returned from CPU
module.

• An error response has
been returned from a
module other than CPU
module.

• CPU module error has
been detected.

• The operating system of
C24 detected some error.
Corrective action
• Make the send data quantity
smaller than the buffer
memory size.
• Increase the value for the
send buffer memory length
designation.
• Designate the start address
and size of transmit/receive
buffer within the range of the
user setting area.
• Set the setting change enable/
disable setting to 'Enable' with
Engineering tool, write to the
CPU, and re-execute after the
CPU reset or powering OFF
 ON.
• Check the data at the time of
read/write request, and
specify the correct data.
• An error code is included in
the response message of MC
protocol. Refer to the manual
for the relevant CPU module
to check the error, and review
the request message of MC
protocol.
• If this error has occurred at
the execution of
G(P).CPRTCL instruction,
refer to the manual for the
relevant CPU module to check
the error, and review the CPU
device number specified in the
data storage area for Non-
conversion Variable or
Conversion Variable.
• An error code is included in
the response message of MC
protocol. Refer to the manual
for the relevant module to
check the error, and review
the request message of MC
protocol.
• Check the error contents of
the CPU module using the
module diagnostics, and take
corrective actions.
Page 490 Corrective actions
for system error
Protocol
MC Nonpr Bidire Prede
ocedu ctiona fined
ral l
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