Mitsubishi Electronics QJ71C24/-R2, QJ71C24N, SH-080007 manual 270

10 TROUBLESHOOTING

MELSEC-Q

Error code										Protocol
	Error				Signal					Non
(Hexa-			Error Contents				Corrective action				Bidire-
					name				MC	Proce-
decimal)											ctional
										dure
	Monitoring device					• Correct the setting value of the
7E6AH	read point range	•	Read point of monitoring device is out of range.		—		read point of the monitoring
	error						device.
7E6BH	CPU abnormal	•	Setting value (fixed value) of CPU abnormal		—	• Correct the setting value (fixed
7E6CH	monitoring setting				—		value) of the CPU abnormal
			monitoring is out of range.
7E6DH	value error				—		monitoring.
7E6EH	System error	•	The OS of the Q series C24 detected some error.		—	(	1)
7E6FH	Modem connection	•	Modem is connected to an incorrect channel.		—	• Correct the CH to which
	error						notification is sent.
		•	The communication with the CPU could not be			• If there is an error in the CPU,
7E70H	CPU error				C/N		eliminate the error on the CPU
			performed normally.
							side and communicate again.
7E81H
to
7E8EH	System error	•	The OS of the Q series C24 detected some error.		—	(	1)
7EC1H
7EC2H
7EC3H	Double send	•	A send request was performed while another send			• Interlock (handshake) the send
	request error		request was being processed.				requests.
						• Make the transmission data
							count smaller than the transmit
	Transmission data						buffer size.
						• Make the non procedure
	count error	•	Data larger than the transmit buffer size was
							protocol transmit buffer size
7EC4H	Transmission/		transmitted.		
							larger.
	receipt buffer	•	Transmission/receipt buffer settings out of range.
						• Designate the first address and
	setting error
							size of transmission/receipt
							buffer in the free area range of
							the user.
		•	Write to Flash ROM was requested when the setting			• When writing to Flash ROM, set
7EC5H	Flash ROM access						switch shown left of the given
	error		modification enable/disable switch in the GX				interface to ON and restart the
			Developer was set to OFF.
							Q series C24.
	Flash ROM access	•	There is an error in the Flash ROM read/write			• Check the read/write request
7EC6H							data and designate the correct
	error		request contents.
							data.
7F00H	System error	•	The OS of the Q series C24 detected some error.		—	(	1)
		•	The next data was received before processing of the			• Increase the transmission time
							by performing handshake with
			previous data was completed.
7F01H	Buffer full error						the external device, etc.
		•	Multiple requests was simultaneously issued for one			• Perform handshake with the
			channel.				request source external device.
7F02H
to	System error	•	The OS of the Q series C24 detected some error.		—	(	1)
7F06H
		•	An ASCII code that cannot be converted to binary			• Check and correct the external
							device transmit message and
			code was received.
	ASCII BIN						restart data communications.
7F20H		•	An odd number of bytes of data was received during		PRO	•	When communicating using
	conversion error
							ASCII	BIN conversion,
			data communications using ASCII	BIN
							always transmit the data in even
			conversion.
							number bytes units.
	Receive header	•	There is an error in the command (frame) part.			• Check and correct the external
7F21H					PRO		device transmit message and
		•	An ASCII code that cannot be converted to binary
	area error
							restart data communications.
			code was received.
		•	A nonexistent command or device was designated.			• Check and correct the external
7F22H	Command error				PRO		device transmit message and
		•	The remote password length is wrong.
							restart data communications.
	MC protocol	•	There is no data (ETX, CR-LF, etc.) following the			• Check and correct the external
7F23H					PRO		device transmit message and
	message error		character area, or designation was incorrect.
							restart data communications.

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