Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Page 484

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27 TROUBLESHOOTING
27.4 Error Code List
7EC4H Transmission
data count error,
Send and receive
buffer setting
error
• Data exceeding the send
buffer memory size was
transmitted.
• Send/receive buffer
settings are out of range.
 • 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.

7EC5H Flash ROM
access error
• Writing to flash ROM was
requested when the
setting change enable/
disable setting is set to be
disabled with Engineering
tool.
 • 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.

7EC6H Flash ROM
access error
• The flash ROM read/write
request contents are
incorrect.
 • Check the data at the time of
read/write request, and
specify the correct data.

7F00H Other module
response error
• An error response has
been returned from CPU
module.
 • 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.

7F01H Other module
response error
• An error response has
been returned from a
module other than CPU
module.
 • 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.

7F02H CPU error • CPU module error has
been detected.
 • Check the error contents of
the CPU module using the
module diagnostics, and take
corrective actions.

7F03H to
7F06H
System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined