Mitsubishi Electronics QJ71C24/-R2, QJ71C24N, SH-080007 manual 269

10 TROUBLESHOOTING

MELSEC-Q

Error code								Protocol
	Error			Signal				Non
(Hexa-			Error Contents			Corrective action			Bidire-
				name			MC	Proce-
decimal)									ctional
								dure
					• Change the write destination to
7E52H	User frame	•	A written frame No. overwrite request was issued.	PRO		an unwritten frame No.
	overwrite error				•	When overwriting, delete the
						given No. beforehand.
		• A nonexistent command was designated in a			• Check and correct the external
	User frame access		subcommand.
7E53H				PRO		device transmit message and
	data error	•	Byte count exceeding the number of bytes that can
						restart data communications.
			be requested was designated.
		• Flash ROM write allow/prohibit designation from GX			• Set to ON at GX Configurator-
	Modification		Configurator-SC is set to OFF.
7E54H				PRO		SC.
	allowed error	•	At the switch setting on GX Developer, modification
					• Set to ON at GX Developer.
			allowed switch was set to OFF.
	User frame data				• Check and correct the external
7E55H		•	There is an error in the user frame variable data.	PRO		device transmit message and
	error
						restart data communications.
7E56H	System error	•	The OS of the Q series C24 detected some error.	—	(	1)
	Flash ROM write				• Re-execute the write operation.
7E57H		•	Cannot write to Flash ROM normally.	PRO		If the error is generated again,
	error
						replace the module.
					• Check and correct the contents
		•	There was an error in the mode No. or transmission			of the external device transmit
7E58H	Mode modification			PRO		message and restart data
	error		specification designated contents when changing			communications.
			the mode.
					• Recheck the switch setting on
						the Q series C24.
					•	Review the program.
	Flash ROM write				• Rewrite the flash ROM area
7E59H	count over limit	•	Flash ROM written 1,000 times	—		(address: 2401H) of the buffer
	error					memory to 0 and restart data
						communications.
	I/O number error				• Correct the I/O number of the
7E5FH	on requested	•	I/O number of requested module is incorrect.	—
						module to which data is sent.
	module
7E60H	Device monitoring	•	PLC CPU monitoring registration was performed	—	•	Cancel the PLC CPU monitoring
	duplicate		twice.			and perform the PLC CPU
	registration error					monitoring registration again.
7E61H	Cycle time units	•	Setting value of cycle time units is out of range.	—	• Correct the setting value of the
	range error					cycle time units.
	PLC CPU	•	Setting value of PLC CPU monitoring function is out		•	Correct the setting value of the
7E62H	monitoring function			—
	error		of range.			PLC CPU monitoring function.
	Transmission	•	Setting of transmission measure of the PLC CPU		•	Correct the setting value of the
7E63H	measure setting			—
			monitoring is incorrect.			transmission measure.
	error
7E64H	Registration point	•	Registration point (word/bit) is out of range.	—	• Correct the setting value of the
	range error					registration point (word/byte)
7E65H	PLC CPU abnormal	•	Setting value of the PLC CPU abnormal monitoring	—	•	Correct the setting value of the
	monitoring number		is out of range.			PLC CPU abnormal monitoring.
	error
	Monitoring	•	Setting value of transmission condition is out of		•	Correct the setting value of the
7E66H	condition error of			—
			range.			transmission condition.
	monitoring device
	CPU abnormal	•	Setting value (fixed value) of CPU abnormal		• Correct the setting value (fixed
7E67H	monitoring setting			—		value) of the CPU abnormal
			monitoring is out of range.
	value error					monitoring.
	Transmission				• Correct the setting value of the
7E68H	condition range	•	Setting value of transmission condition (condition	—		transmission condition
	error of monitoring		agreement transmission) is out of range.			(condition agreement
	device					transmission).
	CPU abnormal	•	Setting value (fixed value) of CPU abnormal		• Correct the setting value (fixed
7E69H	monitoring setting			—		value) of the CPU abnormal
			monitoring is out of range.
	value error					monitoring.

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