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MELSEC-Q
10 TROUBLESHOOTING
Protocol
Error code
(Hexa-
decimal)
Error
Error Contents
Signal
name
Corrective action
MC
Non
Proce-
dure
Bidire-
ctional
7E52
H
User frame
overwrite error
• A written frame No. overwrite request was issued. PRO
• Change the write destination to
an unwritten frame No.
• When overwriting, delete the
given No. beforehand.
7E53H
User frame access
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 external
device transmit message and
restart data communications.
7E54H
Modification
allowed error
• Flash ROM write allow/prohibit designation from GX
Configurator-SC is set to OFF.
• At the switch setting on GX Developer, modification
allowed switch was set to OFF.
PRO
• Set to ON at GX Configurator-
SC.
• Set to ON at GX Developer.
7E55
H
User frame data
error
• There is an error in the user frame variable data. PRO
• Check and correct the external
device transmit message and
restart data communications.
7E56
H
System error • The OS of the Q series C24 detected some error. — ( 1)
7E57H
Flash ROM write
error
• Cannot write to Flash ROM normally. PRO
• Re-execute the write operation.
If the error is generated again,
replace the module.
7E58
H
Mode modification
error
• There was an error in the mode No. or transmission
specification designated contents when changing
the mode.
PRO
• Check and correct the contents
of the external device transmit
message and restart data
communications.
• Recheck the switch setting on
the Q series C24.
7E59H
Flash ROM write
count over limit
error
• Flash ROM written 1,000 times —
• Review the program.
• Rewrite the flash ROM area
(address: 2401
H) of the buffer
memory to 0 and restart data
communications.
7E5F H
I/O number error
on requested
module
• I/O number of requested module is incorrect. —
• Correct the I/O number of the
module to which data is sent.
7E60
H
Device monitoring
duplicate
registration error
• PLC CPU monitoring registration was performed
twice.
—
• Cancel the PLC CPU monitoring
and perform the PLC CPU
monitoring registration again.
7E61
H
Cycle time units
range error
• Setting value of cycle time units is out of range. —
• Correct the setting value of the
cycle time units.
7E62 H
PLC CPU
monitoring function
error
• Setting value of PLC CPU monitoring function is out
of range.
—
• Correct the setting value of the
PLC CPU monitoring function.
7E63 H
Transmission
measure setting
error
• Setting of transmission measure of the PLC CPU
monitoring is incorrect.
—
• Correct the setting value of the
transmission measure.
7E64
H
Registration point
range error
• Registration point (word/bit) is out of range. —
• Correct the setting value of the
registration point (word/byte)
7E65
H
PLC CPU abnormal
monitoring number
error
• Setting value of the PLC CPU abnormal monitoring
is out of range.
—
• Correct the setting value of the
PLC CPU abnormal monitoring.
7E66
H
Monitoring
condition error of
monitoring device
• Setting value of transmission condition is out of
range.
—
• Correct the setting value of the
transmission condition.
7E67 H
CPU abnormal
monitoring setting
value error
• Setting value (fixed value) of CPU abnormal
monitoring is out of range.
—
• Correct the setting value (fixed
value) of the CPU abnormal
monitoring.
7E68
H
Transmission
condition range
error of monitoring
device
• Setting value of transmission condition (condition
agreement transmission) is out of range.
—
• Correct the setting value of the
transmission condition
(condition agreement
transmission).
7E69H
CPU abnormal
monitoring setting
value error
• Setting value (fixed value) of CPU abnormal
monitoring is out of range.
—
• Correct the setting value (fixed
value) of the CPU abnormal
monitoring.